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wolfssl/wolfcrypt/src/pkcs7.c

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/* pkcs7.c
*
* Copyright (C) 2006-2017 wolfSSL Inc.
*
* This file is part of wolfSSL.
*
* wolfSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* wolfSSL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <wolfssl/wolfcrypt/settings.h>
#ifdef HAVE_PKCS7
#include <wolfssl/wolfcrypt/pkcs7.h>
#include <wolfssl/wolfcrypt/error-crypt.h>
#include <wolfssl/wolfcrypt/logging.h>
#include <wolfssl/wolfcrypt/hash.h>
#ifndef NO_RSA
#include <wolfssl/wolfcrypt/rsa.h>
#endif
#ifdef HAVE_ECC
#include <wolfssl/wolfcrypt/ecc.h>
#endif
#ifdef HAVE_LIBZ
#include <wolfssl/wolfcrypt/compress.h>
#endif
#ifndef NO_PWDBASED
#include <wolfssl/wolfcrypt/pwdbased.h>
#endif
#ifdef NO_INLINE
#include <wolfssl/wolfcrypt/misc.h>
#else
#define WOLFSSL_MISC_INCLUDED
#include <wolfcrypt/src/misc.c>
#endif
#ifdef HAVE_SELFTEST
enum {
GCM_NONCE_MID_SZ = 12, /* The usual default nonce size for AES-GCM. */
};
#endif
/* direction for processing, encoding or decoding */
typedef enum {
WC_PKCS7_ENCODE,
WC_PKCS7_DECODE
} pkcs7Direction;
#define NO_USER_CHECK 0
#ifndef NO_PKCS7_STREAM
#define MAX_PKCS7_STREAM_BUFFER 256
struct PKCS7State {
byte* tmpCert;
byte* bufferPt;
byte* key;
byte* nonce; /* stored nonce */
byte* aad; /* additional data for AEAD algos */
byte* tag; /* tag data for AEAD algos */
byte* content;
byte* buffer; /* main internal read buffer */
/* stack variables to store for when returning */
word32 varOne;
int varTwo;
int varThree;
word32 vers;
word32 idx; /* index read into current input buffer */
word32 maxLen; /* sanity cap on maximum amount of data to allow
* needed for GetSequence and other calls */
word32 length; /* amount of data stored */
word32 bufferSz; /* size of internal buffer */
word32 expected; /* next amount of data expected, if needed */
word32 totalRd; /* total amount of bytes read */
word32 nonceSz; /* size of nonce stored */
word32 aadSz; /* size of additional AEAD data */
word32 tagSz; /* size of tag for AEAD */
word32 contentSz;
byte tmpIv[MAX_CONTENT_IV_SIZE]; /* store IV if needed */
#ifdef WC_PKCS7_STREAM_DEBUG
word32 peakUsed; /* most bytes used for struct at any one time */
word32 peakRead; /* most bytes used by read buffer */
#endif
byte multi:1; /* flag for if content is in multiple parts */
byte flagOne:1;
byte detached:1; /* flag to indicate detached signature is present */
};
enum PKCS7_MaxLen {
PKCS7_DEFAULT_PEEK = 0,
PKCS7_SEQ_PEEK
};
/* creates a PKCS7State structure and returns 0 on success */
static int wc_PKCS7_CreateStream(PKCS7* pkcs7)
{
WOLFSSL_MSG("creating PKCS7 stream structure");
pkcs7->stream = (PKCS7State*)XMALLOC(sizeof(PKCS7State), pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (pkcs7->stream == NULL) {
return MEMORY_E;
}
XMEMSET(pkcs7->stream, 0, sizeof(PKCS7State));
#ifdef WC_PKCS7_STREAM_DEBUG
printf("\nCreating new PKCS#7 stream %p\n", pkcs7->stream);
#endif
return 0;
}
static void wc_PKCS7_ResetStream(PKCS7* pkcs7)
{
if (pkcs7 != NULL && pkcs7->stream != NULL) {
#ifdef WC_PKCS7_STREAM_DEBUG
/* collect final data point in case more was read right before reset */
if (pkcs7->stream->length > pkcs7->stream->peakRead) {
pkcs7->stream->peakRead = pkcs7->stream->length;
}
if (pkcs7->stream->bufferSz + pkcs7->stream->aadSz +
pkcs7->stream->nonceSz + pkcs7->stream->tagSz >
pkcs7->stream->peakUsed) {
pkcs7->stream->peakUsed = pkcs7->stream->bufferSz +
pkcs7->stream->aadSz + pkcs7->stream->nonceSz +
pkcs7->stream->tagSz;
}
/* print out debugging statistics */
if (pkcs7->stream->peakUsed > 0 || pkcs7->stream->peakRead > 0) {
printf("PKCS#7 STREAM:\n\tPeak heap used by struct = %d"
"\n\tPeak read buffer bytes = %d"
"\n\tTotal bytes read = %d"
"\n",
pkcs7->stream->peakUsed, pkcs7->stream->peakRead,
pkcs7->stream->totalRd);
}
printf("PKCS#7 stream reset : Address [%p]\n", pkcs7->stream);
#endif
/* free any buffers that may be allocated */
XFREE(pkcs7->stream->aad, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(pkcs7->stream->tag, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(pkcs7->stream->nonce, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(pkcs7->stream->buffer, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(pkcs7->stream->key, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
pkcs7->stream->aad = NULL;
pkcs7->stream->tag = NULL;
pkcs7->stream->nonce = NULL;
pkcs7->stream->buffer = NULL;
pkcs7->stream->key = NULL;
/* reset values, note that content and tmpCert are saved */
pkcs7->stream->maxLen = 0;
pkcs7->stream->length = 0;
pkcs7->stream->idx = 0;
pkcs7->stream->expected = 0;
pkcs7->stream->totalRd = 0;
pkcs7->stream->bufferSz = 0;
pkcs7->stream->multi = 0;
pkcs7->stream->flagOne = 0;
pkcs7->stream->detached = 0;
pkcs7->stream->varOne = 0;
pkcs7->stream->varTwo = 0;
pkcs7->stream->varThree = 0;
}
}
static void wc_PKCS7_FreeStream(PKCS7* pkcs7)
{
if (pkcs7 != NULL && pkcs7->stream != NULL) {
wc_PKCS7_ResetStream(pkcs7);
XFREE(pkcs7->stream->content, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(pkcs7->stream->tmpCert, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
pkcs7->stream->content = NULL;
pkcs7->stream->tmpCert = NULL;
XFREE(pkcs7->stream, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
pkcs7->stream = NULL;
}
}
/* used to increase the max size for internal buffer
* returns 0 on success */
static int wc_PKCS7_GrowStream(PKCS7* pkcs7, word32 newSz)
{
byte* pt;
pt = (byte*)XMALLOC(newSz, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (pt == NULL) {
return MEMORY_E;
}
XMEMCPY(pt, pkcs7->stream->buffer, pkcs7->stream->bufferSz);
#ifdef WC_PKCS7_STREAM_DEBUG
printf("PKCS7 increasing internal stream buffer %d -> %d\n",
pkcs7->stream->bufferSz, newSz);
#endif
pkcs7->stream->bufferSz = newSz;
XFREE(pkcs7->stream->buffer, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
pkcs7->stream->buffer = pt;
return 0;
}
/* pt gets set to the buffer that is holding data in the case that stream struct
* is used.
*
* Sets idx to be the current offset into "pt" buffer
* returns 0 on success
*/
static int wc_PKCS7_AddDataToStream(PKCS7* pkcs7, byte* in, word32 inSz,
word32 expected, byte** pt, word32* idx)
{
word32 rdSz = pkcs7->stream->idx;
/* If the input size minus current index into input buffer is greater than
* the expected size then use the input buffer. If data is already stored
* in stream buffer or if there is not enough input data available then use
* the stream buffer. */
if (inSz - rdSz >= expected && pkcs7->stream->length == 0) {
/* storing input buffer is not needed */
*pt = in; /* reset in case previously used internal buffer */
*idx = rdSz;
return 0;
}
/* is there enough stored in buffer already? */
if (pkcs7->stream->length >= expected) {
*idx = 0; /* start reading from beginning of stream buffer */
*pt = pkcs7->stream->buffer;
return 0;
}
/* check if all data has been read from input */
if (rdSz >= inSz) {
/* no more input to read, reset input index and request more data */
pkcs7->stream->idx = 0;
return WC_PKCS7_WANT_READ_E;
}
/* try to store input data into stream buffer */
if (inSz - rdSz > 0 && pkcs7->stream->length < expected) {
int len = min(inSz - rdSz, expected - pkcs7->stream->length);
/* sanity check that the input buffer is not internal buffer */
if (in == pkcs7->stream->buffer) {
return WC_PKCS7_WANT_READ_E;
}
/* check if internal buffer size needs to be increased */
if (len + pkcs7->stream->length > pkcs7->stream->bufferSz) {
int ret = wc_PKCS7_GrowStream(pkcs7, expected);
if (ret < 0) {
return ret;
}
}
XMEMCPY(pkcs7->stream->buffer + pkcs7->stream->length, in + rdSz, len);
pkcs7->stream->length += len;
pkcs7->stream->idx += len;
pkcs7->stream->totalRd += len;
}
#ifdef WC_PKCS7_STREAM_DEBUG
/* collects memory usage for debugging */
if (pkcs7->stream->length > pkcs7->stream->peakRead) {
pkcs7->stream->peakRead = pkcs7->stream->length;
}
if (pkcs7->stream->bufferSz + pkcs7->stream->aadSz + pkcs7->stream->nonceSz +
pkcs7->stream->tagSz > pkcs7->stream->peakUsed) {
pkcs7->stream->peakUsed = pkcs7->stream->bufferSz +
pkcs7->stream->aadSz + pkcs7->stream->nonceSz + pkcs7->stream->tagSz;
}
#endif
/* if not enough data was read in then request more */
if (pkcs7->stream->length < expected) {
pkcs7->stream->idx = 0;
return WC_PKCS7_WANT_READ_E;
}
/* adjust pointer to read from stored buffer */
*idx = 0;
*pt = pkcs7->stream->buffer;
return 0;
}
/* Does two things
* 1) Tries to get the length from current buffer and set it as max length
* 2) Retrieves the set max length
*
* if no flag value is set then the stored max length is returned.
* returns length found on success and defSz if no stored data is found
*/
static long wc_PKCS7_GetMaxStream(PKCS7* pkcs7, byte flag, byte* in,
word32 defSz)
{
/* check there is a buffer to read from */
if (pkcs7) {
int length = 0, ret;
word32 idx = 0, maxIdx;
byte* pt;
if (flag != PKCS7_DEFAULT_PEEK) {
if (pkcs7->stream->length > 0) {
length = pkcs7->stream->length;
pt = pkcs7->stream->buffer;
}
else {
length = defSz;
pt = in;
}
maxIdx = (word32)length;
if (length < MAX_SEQ_SZ) {
WOLFSSL_MSG("PKCS7 Error not enough data for SEQ peek\n");
return 0;
}
if (flag == PKCS7_SEQ_PEEK) {
if ((ret = GetSequence_ex(pt, &idx, &length, maxIdx,
NO_USER_CHECK)) < 0) {
return ret;
}
pkcs7->stream->maxLen = length + idx;
}
}
return pkcs7->stream->maxLen;
}
if (pkcs7->stream->maxLen == 0) {
pkcs7->stream->maxLen = defSz;
}
return defSz;
}
/* setter function for stored variables */
static void wc_PKCS7_StreamStoreVar(PKCS7* pkcs7, word32 var1, int var2,
int var3)
{
if (pkcs7 != NULL && pkcs7->stream != NULL) {
pkcs7->stream->varOne = var1;
pkcs7->stream->varTwo = var2;
pkcs7->stream->varThree = var3;
}
}
/* getter function for stored variables */
static void wc_PKCS7_StreamGetVar(PKCS7* pkcs7, word32* var1, int* var2,
int* var3)
{
if (pkcs7 != NULL && pkcs7->stream != NULL) {
if (var1 != NULL) *var1 = pkcs7->stream->varOne;
if (var2 != NULL) *var2 = pkcs7->stream->varTwo;
if (var3 != NULL) *var3 = pkcs7->stream->varThree;
}
}
/* common update of index and total read after section complete
* returns 0 on success */
static int wc_PKCS7_StreamEndCase(PKCS7* pkcs7, word32* tmpIdx, word32* idx)
{
int ret = 0;
if (pkcs7->stream->length > 0) {
if (pkcs7->stream->length < *idx) {
WOLFSSL_MSG("PKCS7 read too much data from internal buffer");
ret = BUFFER_E;
}
else {
XMEMMOVE(pkcs7->stream->buffer, pkcs7->stream->buffer + *idx,
pkcs7->stream->length - *idx);
pkcs7->stream->length -= *idx;
}
}
else {
pkcs7->stream->totalRd += *idx - *tmpIdx;
pkcs7->stream->idx = *idx; /* adjust index into input buffer */
*tmpIdx = *idx;
}
return ret;
}
#endif /* NO_PKCS7_STREAM */
#ifdef WC_PKCS7_STREAM_DEBUG
/* used to print out human readable state for debugging */
static const char* wc_PKCS7_GetStateName(int in)
{
switch (in) {
case WC_PKCS7_START: return "WC_PKCS7_START";
case WC_PKCS7_STAGE2: return "WC_PKCS7_STAGE2";
case WC_PKCS7_STAGE3: return "WC_PKCS7_STAGE3";
case WC_PKCS7_STAGE4: return "WC_PKCS7_STAGE4";
case WC_PKCS7_STAGE5: return "WC_PKCS7_STAGE5";
case WC_PKCS7_STAGE6: return "WC_PKCS7_STAGE6";
/* parse info set */
case WC_PKCS7_INFOSET_START: return "WC_PKCS7_INFOSET_START";
case WC_PKCS7_INFOSET_BER: return "WC_PKCS7_INFOSET_BER";
case WC_PKCS7_INFOSET_STAGE1: return "WC_PKCS7_INFOSET_STAGE1";
case WC_PKCS7_INFOSET_STAGE2: return "WC_PKCS7_INFOSET_STAGE2";
case WC_PKCS7_INFOSET_END: return "WC_PKCS7_INFOSET_END";
/* decode enveloped data */
case WC_PKCS7_ENV_2: return "WC_PKCS7_ENV_2";
case WC_PKCS7_ENV_3: return "WC_PKCS7_ENV_3";
case WC_PKCS7_ENV_4: return "WC_PKCS7_ENV_4";
case WC_PKCS7_ENV_5: return "WC_PKCS7_ENV_5";
/* decode auth enveloped */
case WC_PKCS7_AUTHENV_2: return "WC_PKCS7_AUTHENV_2";
case WC_PKCS7_AUTHENV_3: return "WC_PKCS7_AUTHENV_3";
case WC_PKCS7_AUTHENV_4: return "WC_PKCS7_AUTHENV_4";
case WC_PKCS7_AUTHENV_5: return "WC_PKCS7_AUTHENV_5";
case WC_PKCS7_AUTHENV_6: return "WC_PKCS7_AUTHENV_6";
case WC_PKCS7_AUTHENV_ATRB: return "WC_PKCS7_AUTHENV_ATRB";
case WC_PKCS7_AUTHENV_ATRBEND: return "WC_PKCS7_AUTHENV_ATRBEND";
case WC_PKCS7_AUTHENV_7: return "WC_PKCS7_AUTHENV_7";
/* decryption state types */
case WC_PKCS7_DECRYPT_KTRI: return "WC_PKCS7_DECRYPT_KTRI";
case WC_PKCS7_DECRYPT_KTRI_2: return "WC_PKCS7_DECRYPT_KTRI_2";
case WC_PKCS7_DECRYPT_KTRI_3: return "WC_PKCS7_DECRYPT_KTRI_3";
case WC_PKCS7_DECRYPT_KARI: return "WC_PKCS7_DECRYPT_KARI";
case WC_PKCS7_DECRYPT_KEKRI: return "WC_PKCS7_DECRYPT_KEKRI";
case WC_PKCS7_DECRYPT_PWRI: return "WC_PKCS7_DECRYPT_PWRI";
case WC_PKCS7_DECRYPT_ORI: return "WC_PKCS7_DECRYPT_ORI";
case WC_PKCS7_DECRYPT_DONE: return "WC_PKCS7_DECRYPT_DONE";
case WC_PKCS7_VERIFY_STAGE2: return "WC_PKCS7_VERIFY_STAGE2";
case WC_PKCS7_VERIFY_STAGE3: return "WC_PKCS7_VERIFY_STAGE3";
case WC_PKCS7_VERIFY_STAGE4: return "WC_PKCS7_VERIFY_STAGE4";
case WC_PKCS7_VERIFY_STAGE5: return "WC_PKCS7_VERIFY_STAGE5";
case WC_PKCS7_VERIFY_STAGE6: return "WC_PKCS7_VERIFY_STAGE6";
default:
return "Unknown state";
}
}
#endif
/* Used to change the PKCS7 state. Having state change as a function allows
* for easier debugging */
static void wc_PKCS7_ChangeState(PKCS7* pkcs7, int newState)
{
#ifdef WC_PKCS7_STREAM_DEBUG
printf("\tChanging from state [%02d] %s to [%02d] %s\n",
pkcs7->state, wc_PKCS7_GetStateName(pkcs7->state),
newState, wc_PKCS7_GetStateName(newState));
#endif
pkcs7->state = newState;
}
#define MAX_PKCS7_DIGEST_SZ (MAX_SEQ_SZ + MAX_ALGO_SZ + \
MAX_OCTET_STR_SZ + WC_MAX_DIGEST_SIZE)
/* placed ASN.1 contentType OID into *output, return idx on success,
* 0 upon failure */
static int wc_SetContentType(int pkcs7TypeOID, byte* output, word32 outputSz)
{
/* PKCS#7 content types, RFC 2315, section 14 */
const byte pkcs7[] = { 0x2A, 0x86, 0x48, 0x86, 0xF7,
0x0D, 0x01, 0x07 };
const byte data[] = { 0x2A, 0x86, 0x48, 0x86, 0xF7,
0x0D, 0x01, 0x07, 0x01 };
const byte signedData[] = { 0x2A, 0x86, 0x48, 0x86, 0xF7,
0x0D, 0x01, 0x07, 0x02};
const byte envelopedData[] = { 0x2A, 0x86, 0x48, 0x86, 0xF7,
0x0D, 0x01, 0x07, 0x03 };
const byte authEnvelopedData[] = { 0x2A, 0x86, 0x48, 0x86, 0xF7,
0x0D, 0x01, 0x09, 0x10, 0x01, 0x17};
const byte signedAndEnveloped[] = { 0x2A, 0x86, 0x48, 0x86, 0xF7,
0x0D, 0x01, 0x07, 0x04 };
const byte digestedData[] = { 0x2A, 0x86, 0x48, 0x86, 0xF7,
0x0D, 0x01, 0x07, 0x05 };
#ifndef NO_PKCS7_ENCRYPTED_DATA
const byte encryptedData[] = { 0x2A, 0x86, 0x48, 0x86, 0xF7,
0x0D, 0x01, 0x07, 0x06 };
#endif
/* FirmwarePkgData (1.2.840.113549.1.9.16.1.16), RFC 4108 */
const byte firmwarePkgData[] = { 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D,
0x01, 0x09, 0x10, 0x01, 0x10 };
#if defined(HAVE_LIBZ) && !defined(NO_PKCS7_COMPRESSED_DATA)
/* id-ct-compressedData (1.2.840.113549.1.9.16.1.9), RFC 3274 */
const byte compressedData[] = { 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D,
0x01, 0x09, 0x10, 0x01, 0x09 };
#endif
#if !defined(NO_PWDBASED) && !defined(NO_SHA)
const byte pwriKek[] = { 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D,
0x01, 0x09, 0x10, 0x03, 0x09 };
const byte pbkdf2[] = { 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D,
0x01, 0x05, 0x0C };
#endif
int idSz, idx = 0;
word32 typeSz = 0;
const byte* typeName = 0;
byte ID_Length[MAX_LENGTH_SZ];
switch (pkcs7TypeOID) {
case PKCS7_MSG:
typeSz = sizeof(pkcs7);
typeName = pkcs7;
break;
case DATA:
typeSz = sizeof(data);
typeName = data;
break;
case SIGNED_DATA:
typeSz = sizeof(signedData);
typeName = signedData;
break;
case ENVELOPED_DATA:
typeSz = sizeof(envelopedData);
typeName = envelopedData;
break;
case AUTH_ENVELOPED_DATA:
typeSz = sizeof(authEnvelopedData);
typeName = authEnvelopedData;
break;
case SIGNED_AND_ENVELOPED_DATA:
typeSz = sizeof(signedAndEnveloped);
typeName = signedAndEnveloped;
break;
case DIGESTED_DATA:
typeSz = sizeof(digestedData);
typeName = digestedData;
break;
#ifndef NO_PKCS7_ENCRYPTED_DATA
case ENCRYPTED_DATA:
typeSz = sizeof(encryptedData);
typeName = encryptedData;
break;
#endif
#if defined(HAVE_LIBZ) && !defined(NO_PKCS7_COMPRESSED_DATA)
case COMPRESSED_DATA:
typeSz = sizeof(compressedData);
typeName = compressedData;
break;
#endif
case FIRMWARE_PKG_DATA:
typeSz = sizeof(firmwarePkgData);
typeName = firmwarePkgData;
break;
#if !defined(NO_PWDBASED) && !defined(NO_SHA)
case PWRI_KEK_WRAP:
typeSz = sizeof(pwriKek);
typeName = pwriKek;
break;
case PBKDF2_OID:
typeSz = sizeof(pbkdf2);
typeName = pbkdf2;
break;
#endif
default:
WOLFSSL_MSG("Unknown PKCS#7 Type");
return 0;
};
if (outputSz < (MAX_LENGTH_SZ + 1 + typeSz)) {
WOLFSSL_MSG("CMS content type buffer too small");
return BAD_FUNC_ARG;
}
idSz = SetLength(typeSz, ID_Length);
output[idx++] = ASN_OBJECT_ID;
XMEMCPY(output + idx, ID_Length, idSz);
idx += idSz;
XMEMCPY(output + idx, typeName, typeSz);
idx += typeSz;
return idx;
}
/* get ASN.1 contentType OID sum, return 0 on success, <0 on failure */
static int wc_GetContentType(const byte* input, word32* inOutIdx, word32* oid,
word32 maxIdx)
{
WOLFSSL_ENTER("wc_GetContentType");
if (GetObjectId(input, inOutIdx, oid, oidIgnoreType, maxIdx) < 0)
return ASN_PARSE_E;
return 0;
}
/* return block size for algorithm represented by oid, or <0 on error */
static int wc_PKCS7_GetOIDBlockSize(int oid)
{
int blockSz;
switch (oid) {
#ifndef NO_AES
#ifdef WOLFSSL_AES_128
case AES128CBCb:
case AES128GCMb:
case AES128CCMb:
#endif
#ifdef WOLFSSL_AES_192
case AES192CBCb:
case AES192GCMb:
case AES192CCMb:
#endif
#ifdef WOLFSSL_AES_256
case AES256CBCb:
case AES256GCMb:
case AES256CCMb:
#endif
blockSz = AES_BLOCK_SIZE;
break;
#endif
#ifndef NO_DES3
case DESb:
case DES3b:
blockSz = DES_BLOCK_SIZE;
break;
#endif
default:
WOLFSSL_MSG("Unsupported content cipher type");
return ALGO_ID_E;
};
return blockSz;
}
/* get key size for algorithm represented by oid, or <0 on error */
static int wc_PKCS7_GetOIDKeySize(int oid)
{
int blockKeySz;
switch (oid) {
#ifndef NO_AES
#ifdef WOLFSSL_AES_128
case AES128CBCb:
case AES128GCMb:
case AES128CCMb:
case AES128_WRAP:
blockKeySz = 16;
break;
#endif
#ifdef WOLFSSL_AES_192
case AES192CBCb:
case AES192GCMb:
case AES192CCMb:
case AES192_WRAP:
blockKeySz = 24;
break;
#endif
#ifdef WOLFSSL_AES_256
case AES256CBCb:
case AES256GCMb:
case AES256CCMb:
case AES256_WRAP:
blockKeySz = 32;
break;
#endif
#endif
#ifndef NO_DES3
case DESb:
blockKeySz = DES_KEYLEN;
break;
case DES3b:
blockKeySz = DES3_KEYLEN;
break;
#endif
default:
WOLFSSL_MSG("Unsupported content cipher type");
return ALGO_ID_E;
};
return blockKeySz;
}
PKCS7* wc_PKCS7_New(void* heap, int devId)
{
PKCS7* pkcs7 = (PKCS7*)XMALLOC(sizeof(PKCS7), heap, DYNAMIC_TYPE_PKCS7);
if (pkcs7) {
XMEMSET(pkcs7, 0, sizeof(PKCS7));
if (wc_PKCS7_Init(pkcs7, heap, devId) == 0) {
pkcs7->isDynamic = 1;
}
else {
XFREE(pkcs7, heap, DYNAMIC_TYPE_PKCS7);
pkcs7 = NULL;
}
}
return pkcs7;
}
/* This is to initialize a PKCS7 structure. It sets all values to 0 and can be
* used to set the heap hint.
*
* pkcs7 PKCS7 structure to initialize
* heap memory heap hint for PKCS7 structure to use
* devId currently not used but a place holder for async operations
*
* returns 0 on success or a negative value for failure
*/
int wc_PKCS7_Init(PKCS7* pkcs7, void* heap, int devId)
{
word16 isDynamic;
WOLFSSL_ENTER("wc_PKCS7_Init");
if (pkcs7 == NULL) {
return BAD_FUNC_ARG;
}
isDynamic = pkcs7->isDynamic;
XMEMSET(pkcs7, 0, sizeof(PKCS7));
pkcs7->isDynamic = isDynamic;
#ifdef WOLFSSL_HEAP_TEST
pkcs7->heap = (void*)WOLFSSL_HEAP_TEST;
#else
pkcs7->heap = heap;
#endif
pkcs7->devId = devId;
return 0;
}
/* Certificate structure holding der pointer, size, and pointer to next
* Pkcs7Cert struct. Used when creating SignedData types with multiple
* certificates. */
struct Pkcs7Cert {
byte* der;
word32 derSz;
Pkcs7Cert* next;
};
/* Linked list of ASN.1 encoded RecipientInfos */
struct Pkcs7EncodedRecip {
byte recip[MAX_RECIP_SZ];
word32 recipSz;
int recipType;
int recipVersion;
Pkcs7EncodedRecip* next;
};
/* free all members of Pkcs7Cert linked list */
static void wc_PKCS7_FreeCertSet(PKCS7* pkcs7)
{
Pkcs7Cert* curr = NULL;
Pkcs7Cert* next = NULL;
if (pkcs7 == NULL)
return;
curr = pkcs7->certList;
pkcs7->certList = NULL;
while (curr != NULL) {
next = curr->next;
curr->next = NULL;
XFREE(curr, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
curr = next;
}
return;
}
/* Get total size of all recipients in recipient list.
*
* Returns total size of recipients, or negative upon error */
static int wc_PKCS7_GetRecipientListSize(PKCS7* pkcs7)
{
int totalSz = 0;
Pkcs7EncodedRecip* tmp = NULL;
if (pkcs7 == NULL)
return BAD_FUNC_ARG;
tmp = pkcs7->recipList;
while (tmp != NULL) {
totalSz += tmp->recipSz;
tmp = tmp->next;
}
return totalSz;
}
/* free all members of Pkcs7EncodedRecip linked list */
static void wc_PKCS7_FreeEncodedRecipientSet(PKCS7* pkcs7)
{
Pkcs7EncodedRecip* curr = NULL;
Pkcs7EncodedRecip* next = NULL;
if (pkcs7 == NULL)
return;
curr = pkcs7->recipList;
pkcs7->recipList = NULL;
while (curr != NULL) {
next = curr->next;
curr->next = NULL;
XFREE(curr, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
curr = next;
}
return;
}
/* search through RecipientInfo list for specific type.
* return 1 if ANY recipient of type specified is present, otherwise
* return 0 */
static int wc_PKCS7_RecipientListIncludesType(PKCS7* pkcs7, int type)
{
Pkcs7EncodedRecip* tmp = NULL;
if (pkcs7 == NULL)
return BAD_FUNC_ARG;
tmp = pkcs7->recipList;
while (tmp != NULL) {
if (tmp->recipType == type)
return 1;
tmp = tmp->next;
}
return 0;
}
/* searches through RecipientInfo list, returns 1 if all structure
* versions are set to 0, otherwise returns 0 */
static int wc_PKCS7_RecipientListVersionsAllZero(PKCS7* pkcs7)
{
Pkcs7EncodedRecip* tmp = NULL;
if (pkcs7 == NULL)
return BAD_FUNC_ARG;
tmp = pkcs7->recipList;
while (tmp != NULL) {
if (tmp->recipVersion != 0)
return 0;
tmp = tmp->next;
}
return 1;
}
/* Init PKCS7 struct with recipient cert, decode into DecodedCert
* NOTE: keeps previously set pkcs7 heap hint, devId and isDynamic */
int wc_PKCS7_InitWithCert(PKCS7* pkcs7, byte* derCert, word32 derCertSz)
{
int ret = 0;
void* heap;
int devId;
Pkcs7Cert* cert;
Pkcs7Cert* lastCert;
if (pkcs7 == NULL || (derCert == NULL && derCertSz != 0)) {
return BAD_FUNC_ARG;
}
heap = pkcs7->heap;
devId = pkcs7->devId;
cert = pkcs7->certList;
ret = wc_PKCS7_Init(pkcs7, heap, devId);
if (ret != 0)
return ret;
pkcs7->certList = cert;
if (derCert != NULL && derCertSz > 0) {
#ifdef WOLFSSL_SMALL_STACK
DecodedCert* dCert;
dCert = (DecodedCert*)XMALLOC(sizeof(DecodedCert), pkcs7->heap,
DYNAMIC_TYPE_DCERT);
if (dCert == NULL)
return MEMORY_E;
#else
DecodedCert dCert[1];
#endif
pkcs7->singleCert = derCert;
pkcs7->singleCertSz = derCertSz;
/* create new Pkcs7Cert for recipient, freed during cleanup */
cert = (Pkcs7Cert*)XMALLOC(sizeof(Pkcs7Cert), pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
XMEMSET(cert, 0, sizeof(Pkcs7Cert));
cert->der = derCert;
cert->derSz = derCertSz;
cert->next = NULL;
/* free existing cert list if existing */
wc_PKCS7_FreeCertSet(pkcs7);
/* add cert to list */
if (pkcs7->certList == NULL) {
pkcs7->certList = cert;
} else {
lastCert = pkcs7->certList;
while (lastCert->next != NULL) {
lastCert = lastCert->next;
}
lastCert->next = cert;
}
InitDecodedCert(dCert, derCert, derCertSz, pkcs7->heap);
ret = ParseCert(dCert, CA_TYPE, NO_VERIFY, 0);
if (ret < 0) {
FreeDecodedCert(dCert);
#ifdef WOLFSSL_SMALL_STACK
XFREE(dCert, pkcs7->heap, DYNAMIC_TYPE_DCERT);
#endif
return ret;
}
XMEMCPY(pkcs7->publicKey, dCert->publicKey, dCert->pubKeySize);
pkcs7->publicKeySz = dCert->pubKeySize;
pkcs7->publicKeyOID = dCert->keyOID;
XMEMCPY(pkcs7->issuerHash, dCert->issuerHash, KEYID_SIZE);
pkcs7->issuer = dCert->issuerRaw;
pkcs7->issuerSz = dCert->issuerRawLen;
XMEMCPY(pkcs7->issuerSn, dCert->serial, dCert->serialSz);
pkcs7->issuerSnSz = dCert->serialSz;
XMEMCPY(pkcs7->issuerSubjKeyId, dCert->extSubjKeyId, KEYID_SIZE);
/* default to IssuerAndSerialNumber for SignerIdentifier */
pkcs7->sidType = CMS_ISSUER_AND_SERIAL_NUMBER;
/* free existing recipient list if existing */
wc_PKCS7_FreeEncodedRecipientSet(pkcs7);
FreeDecodedCert(dCert);
#ifdef WOLFSSL_SMALL_STACK
XFREE(dCert, pkcs7->heap, DYNAMIC_TYPE_DCERT);
#endif
}
return ret;
}
/* Adds one DER-formatted certificate to the internal PKCS7/CMS certificate
* list, to be added as part of the certificates CertificateSet. Currently
* used in SignedData content type.
*
* Must be called after wc_PKCS7_Init() or wc_PKCS7_InitWithCert().
*
* Does not represent the recipient/signer certificate, only certificates that
* are part of the certificate chain used to build and verify signer
* certificates.
*
* This API does not currently validate certificates.
*
* Returns 0 on success, negative upon error */
int wc_PKCS7_AddCertificate(PKCS7* pkcs7, byte* derCert, word32 derCertSz)
{
Pkcs7Cert* cert;
if (pkcs7 == NULL || derCert == NULL || derCertSz == 0)
return BAD_FUNC_ARG;
cert = (Pkcs7Cert*)XMALLOC(sizeof(Pkcs7Cert), pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (cert == NULL)
return MEMORY_E;
cert->der = derCert;
cert->derSz = derCertSz;
if (pkcs7->certList == NULL) {
pkcs7->certList = cert;
} else {
cert->next = pkcs7->certList;
pkcs7->certList = cert;
}
return 0;
}
/* free linked list of PKCS7DecodedAttrib structs */
static void wc_PKCS7_FreeDecodedAttrib(PKCS7DecodedAttrib* attrib, void* heap)
{
PKCS7DecodedAttrib* current;
if (attrib == NULL) {
return;
}
current = attrib;
while (current != NULL) {
PKCS7DecodedAttrib* next = current->next;
if (current->oid != NULL) {
XFREE(current->oid, heap, DYNAMIC_TYPE_PKCS7);
}
if (current->value != NULL) {
XFREE(current->value, heap, DYNAMIC_TYPE_PKCS7);
}
XFREE(current, heap, DYNAMIC_TYPE_PKCS7);
current = next;
}
(void)heap;
}
/* releases any memory allocated by a PKCS7 initializer */
void wc_PKCS7_Free(PKCS7* pkcs7)
{
if (pkcs7 == NULL)
return;
#ifndef NO_PKCS7_STREAM
wc_PKCS7_FreeStream(pkcs7);
#endif
wc_PKCS7_FreeDecodedAttrib(pkcs7->decodedAttrib, pkcs7->heap);
wc_PKCS7_FreeCertSet(pkcs7);
#ifdef ASN_BER_TO_DER
if (pkcs7->der != NULL)
XFREE(pkcs7->der, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#endif
if (pkcs7->contentDynamic != NULL)
XFREE(pkcs7->contentDynamic, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (pkcs7->cek != NULL) {
ForceZero(pkcs7->cek, pkcs7->cekSz);
XFREE(pkcs7->cek, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
}
pkcs7->contentTypeSz = 0;
if (pkcs7->isDynamic) {
pkcs7->isDynamic = 0;
XFREE(pkcs7, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
}
}
/* helper function for parsing through attributes and finding a specific one.
* returns PKCS7DecodedAttrib pointer on success */
static PKCS7DecodedAttrib* findAttrib(PKCS7* pkcs7, const byte* oid, word32 oidSz)
{
PKCS7DecodedAttrib* list;
if (pkcs7 == NULL || oid == NULL) {
return NULL;
}
/* search attributes for pkiStatus */
list = pkcs7->decodedAttrib;
while (list != NULL) {
word32 sz = oidSz;
word32 idx = 0;
int length = 0;
if (list->oid[idx++] != ASN_OBJECT_ID) {
WOLFSSL_MSG("Bad attribute ASN1 syntax");
return NULL;
}
if (GetLength(list->oid, &idx, &length, list->oidSz) < 0) {
WOLFSSL_MSG("Bad attribute length");
return NULL;
}
sz = (sz < (word32)length)? sz : (word32)length;
if (XMEMCMP(oid, list->oid + idx, sz) == 0) {
return list;
}
list = list->next;
}
return NULL;
}
/* Searches through decoded attributes and returns the value for the first one
* matching the oid passed in. Note that this value includes the leading ASN1
* syntax. So for a printable string of "3" this would be something like
*
* 0x13, 0x01, 0x33
* ID SIZE "3"
*
* pkcs7 structure to get value from
* oid OID value to search for with attributes
* oidSz size of oid buffer
* out buffer to hold result
* outSz size of out buffer (if out is NULL this is set to needed size and
LENGTH_ONLY_E is returned)
*
* returns size of value on success
*/
int wc_PKCS7_GetAttributeValue(PKCS7* pkcs7, const byte* oid, word32 oidSz,
byte* out, word32* outSz)
{
PKCS7DecodedAttrib* attrib;
if (pkcs7 == NULL || oid == NULL || outSz == NULL) {
return BAD_FUNC_ARG;
}
attrib = findAttrib(pkcs7, oid, oidSz);
if (attrib == NULL) {
return ASN_PARSE_E;
}
if (out == NULL) {
*outSz = attrib->valueSz;
return LENGTH_ONLY_E;
}
if (*outSz < attrib->valueSz) {
return BUFFER_E;
}
XMEMCPY(out, attrib->value, attrib->valueSz);
return attrib->valueSz;
}
/* build PKCS#7 data content type */
int wc_PKCS7_EncodeData(PKCS7* pkcs7, byte* output, word32 outputSz)
{
static const byte oid[] =
{ ASN_OBJECT_ID, 0x09, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x01,
0x07, 0x01 };
byte seq[MAX_SEQ_SZ];
byte octetStr[MAX_OCTET_STR_SZ];
word32 seqSz;
word32 octetStrSz;
word32 oidSz = (word32)sizeof(oid);
int idx = 0;
if (pkcs7 == NULL || output == NULL) {
return BAD_FUNC_ARG;
}
octetStrSz = SetOctetString(pkcs7->contentSz, octetStr);
seqSz = SetSequence(pkcs7->contentSz + octetStrSz + oidSz, seq);
if (outputSz < pkcs7->contentSz + octetStrSz + oidSz + seqSz)
return BUFFER_E;
XMEMCPY(output, seq, seqSz);
idx += seqSz;
XMEMCPY(output + idx, oid, oidSz);
idx += oidSz;
XMEMCPY(output + idx, octetStr, octetStrSz);
idx += octetStrSz;
XMEMCPY(output + idx, pkcs7->content, pkcs7->contentSz);
idx += pkcs7->contentSz;
return idx;
}
typedef struct EncodedAttrib {
byte valueSeq[MAX_SEQ_SZ];
const byte* oid;
byte valueSet[MAX_SET_SZ];
const byte* value;
word32 valueSeqSz, oidSz, idSz, valueSetSz, valueSz, totalSz;
} EncodedAttrib;
typedef struct ESD {
wc_HashAlg hash;
enum wc_HashType hashType;
byte contentDigest[WC_MAX_DIGEST_SIZE + 2]; /* content only + ASN.1 heading */
byte contentAttribsDigest[WC_MAX_DIGEST_SIZE];
byte encContentDigest[MAX_ENCRYPTED_KEY_SZ];
byte outerSeq[MAX_SEQ_SZ];
byte outerContent[MAX_EXP_SZ];
byte innerSeq[MAX_SEQ_SZ];
byte version[MAX_VERSION_SZ];
byte digAlgoIdSet[MAX_SET_SZ];
byte singleDigAlgoId[MAX_ALGO_SZ];
byte contentInfoSeq[MAX_SEQ_SZ];
byte innerContSeq[MAX_EXP_SZ];
byte innerOctets[MAX_OCTET_STR_SZ];
byte certsSet[MAX_SET_SZ];
byte signerInfoSet[MAX_SET_SZ];
byte signerInfoSeq[MAX_SEQ_SZ];
byte signerVersion[MAX_VERSION_SZ];
/* issuerAndSerialNumber ...*/
byte issuerSnSeq[MAX_SEQ_SZ];
byte issuerName[MAX_SEQ_SZ];
byte issuerSn[MAX_SN_SZ];
/* OR subjectKeyIdentifier */
byte issuerSKIDSeq[MAX_SEQ_SZ];
byte issuerSKID[MAX_OCTET_STR_SZ];
byte signerDigAlgoId[MAX_ALGO_SZ];
byte digEncAlgoId[MAX_ALGO_SZ];
byte signedAttribSet[MAX_SET_SZ];
EncodedAttrib signedAttribs[7];
byte signerDigest[MAX_OCTET_STR_SZ];
word32 innerOctetsSz, innerContSeqSz, contentInfoSeqSz;
word32 outerSeqSz, outerContentSz, innerSeqSz, versionSz, digAlgoIdSetSz,
singleDigAlgoIdSz, certsSetSz;
word32 signerInfoSetSz, signerInfoSeqSz, signerVersionSz,
issuerSnSeqSz, issuerNameSz, issuerSnSz, issuerSKIDSz,
issuerSKIDSeqSz, signerDigAlgoIdSz, digEncAlgoIdSz, signerDigestSz;
word32 encContentDigestSz, signedAttribsSz, signedAttribsCount,
signedAttribSetSz;
} ESD;
static int EncodeAttributes(EncodedAttrib* ea, int eaSz,
PKCS7Attrib* attribs, int attribsSz)
{
int i;
int maxSz = min(eaSz, attribsSz);
int allAttribsSz = 0;
for (i = 0; i < maxSz; i++)
{
int attribSz = 0;
ea[i].value = attribs[i].value;
ea[i].valueSz = attribs[i].valueSz;
attribSz += ea[i].valueSz;
ea[i].valueSetSz = SetSet(attribSz, ea[i].valueSet);
attribSz += ea[i].valueSetSz;
ea[i].oid = attribs[i].oid;
ea[i].oidSz = attribs[i].oidSz;
attribSz += ea[i].oidSz;
ea[i].valueSeqSz = SetSequence(attribSz, ea[i].valueSeq);
attribSz += ea[i].valueSeqSz;
ea[i].totalSz = attribSz;
allAttribsSz += attribSz;
}
return allAttribsSz;
}
static int FlattenAttributes(byte* output, EncodedAttrib* ea, int eaSz)
{
int i, idx;
idx = 0;
for (i = 0; i < eaSz; i++) {
XMEMCPY(output + idx, ea[i].valueSeq, ea[i].valueSeqSz);
idx += ea[i].valueSeqSz;
XMEMCPY(output + idx, ea[i].oid, ea[i].oidSz);
idx += ea[i].oidSz;
XMEMCPY(output + idx, ea[i].valueSet, ea[i].valueSetSz);
idx += ea[i].valueSetSz;
XMEMCPY(output + idx, ea[i].value, ea[i].valueSz);
idx += ea[i].valueSz;
}
return 0;
}
#ifndef NO_RSA
/* returns size of signature put into out, negative on error */
static int wc_PKCS7_RsaSign(PKCS7* pkcs7, byte* in, word32 inSz, ESD* esd)
{
int ret;
word32 idx;
#ifdef WOLFSSL_SMALL_STACK
RsaKey* privKey;
#else
RsaKey privKey[1];
#endif
if (pkcs7 == NULL || pkcs7->rng == NULL || in == NULL || esd == NULL) {
return BAD_FUNC_ARG;
}
#ifdef WOLFSSL_SMALL_STACK
privKey = (RsaKey*)XMALLOC(sizeof(RsaKey), pkcs7->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (privKey == NULL)
return MEMORY_E;
#endif
ret = wc_InitRsaKey_ex(privKey, pkcs7->heap, pkcs7->devId);
if (ret == 0) {
if (pkcs7->privateKey != NULL && pkcs7->privateKeySz > 0) {
idx = 0;
ret = wc_RsaPrivateKeyDecode(pkcs7->privateKey, &idx, privKey,
pkcs7->privateKeySz);
}
else if (pkcs7->devId == INVALID_DEVID) {
ret = BAD_FUNC_ARG;
}
}
if (ret == 0) {
#ifdef WOLFSSL_ASYNC_CRYPT
do {
ret = wc_AsyncWait(ret, &privKey->asyncDev,
WC_ASYNC_FLAG_CALL_AGAIN);
#endif
if (ret >= 0) {
ret = wc_RsaSSL_Sign(in, inSz, esd->encContentDigest,
sizeof(esd->encContentDigest),
privKey, pkcs7->rng);
}
#ifdef WOLFSSL_ASYNC_CRYPT
} while (ret == WC_PENDING_E);
#endif
}
wc_FreeRsaKey(privKey);
#ifdef WOLFSSL_SMALL_STACK
XFREE(privKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ret;
}
#endif /* NO_RSA */
#ifdef HAVE_ECC
/* returns size of signature put into out, negative on error */
static int wc_PKCS7_EcdsaSign(PKCS7* pkcs7, byte* in, word32 inSz, ESD* esd)
{
int ret;
word32 outSz, idx;
#ifdef WOLFSSL_SMALL_STACK
ecc_key* privKey;
#else
ecc_key privKey[1];
#endif
if (pkcs7 == NULL || pkcs7->rng == NULL || in == NULL || esd == NULL) {
return BAD_FUNC_ARG;
}
#ifdef WOLFSSL_SMALL_STACK
privKey = (ecc_key*)XMALLOC(sizeof(ecc_key), pkcs7->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (privKey == NULL)
return MEMORY_E;
#endif
ret = wc_ecc_init_ex(privKey, pkcs7->heap, pkcs7->devId);
if (ret == 0) {
if (pkcs7->privateKey != NULL && pkcs7->privateKeySz > 0) {
idx = 0;
ret = wc_EccPrivateKeyDecode(pkcs7->privateKey, &idx, privKey,
pkcs7->privateKeySz);
}
else if (pkcs7->devId == INVALID_DEVID) {
ret = BAD_FUNC_ARG;
}
}
if (ret == 0) {
outSz = sizeof(esd->encContentDigest);
#ifdef WOLFSSL_ASYNC_CRYPT
do {
ret = wc_AsyncWait(ret, &privKey->asyncDev,
WC_ASYNC_FLAG_CALL_AGAIN);
#endif
if (ret >= 0) {
ret = wc_ecc_sign_hash(in, inSz, esd->encContentDigest,
&outSz, pkcs7->rng, privKey);
}
#ifdef WOLFSSL_ASYNC_CRYPT
} while (ret == WC_PENDING_E);
#endif
if (ret == 0)
ret = (int)outSz;
}
wc_ecc_free(privKey);
#ifdef WOLFSSL_SMALL_STACK
XFREE(privKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ret;
}
#endif /* HAVE_ECC */
/* builds up SignedData signed attributes, including default ones.
*
* pkcs7 - pointer to initialized PKCS7 structure
* esd - pointer to initialized ESD structure, used for output
*
* return 0 on success, negative on error */
static int wc_PKCS7_BuildSignedAttributes(PKCS7* pkcs7, ESD* esd,
const byte* contentType, word32 contentTypeSz,
const byte* contentTypeOid, word32 contentTypeOidSz,
const byte* messageDigestOid, word32 messageDigestOidSz,
const byte* signingTimeOid, word32 signingTimeOidSz,
byte* signingTime, word32 signingTimeSz)
{
int hashSz;
#ifdef NO_ASN_TIME
PKCS7Attrib cannedAttribs[2];
#else
time_t tm;
int timeSz;
PKCS7Attrib cannedAttribs[3];
#endif
word32 idx = 0;
word32 cannedAttribsCount;
if (pkcs7 == NULL || esd == NULL || contentType == NULL ||
contentTypeOid == NULL || messageDigestOid == NULL ||
signingTimeOid == NULL) {
return BAD_FUNC_ARG;
}
if (pkcs7->skipDefaultSignedAttribs == 0) {
hashSz = wc_HashGetDigestSize(esd->hashType);
if (hashSz < 0)
return hashSz;
#ifndef NO_ASN_TIME
if (signingTime == NULL || signingTimeSz == 0)
return BAD_FUNC_ARG;
tm = XTIME(0);
timeSz = GetAsnTimeString(&tm, signingTime, signingTimeSz);
if (timeSz < 0)
return timeSz;
#endif
cannedAttribsCount = sizeof(cannedAttribs)/sizeof(PKCS7Attrib);
cannedAttribs[idx].oid = contentTypeOid;
cannedAttribs[idx].oidSz = contentTypeOidSz;
cannedAttribs[idx].value = contentType;
cannedAttribs[idx].valueSz = contentTypeSz;
idx++;
#ifndef NO_ASN_TIME
cannedAttribs[idx].oid = signingTimeOid;
cannedAttribs[idx].oidSz = signingTimeOidSz;
cannedAttribs[idx].value = signingTime;
cannedAttribs[idx].valueSz = timeSz;
idx++;
#endif
cannedAttribs[idx].oid = messageDigestOid;
cannedAttribs[idx].oidSz = messageDigestOidSz;
cannedAttribs[idx].value = esd->contentDigest;
cannedAttribs[idx].valueSz = hashSz + 2; /* ASN.1 heading */
esd->signedAttribsCount += cannedAttribsCount;
esd->signedAttribsSz += EncodeAttributes(&esd->signedAttribs[0], 3,
cannedAttribs, cannedAttribsCount);
} else {
esd->signedAttribsCount = 0;
esd->signedAttribsSz = 0;
}
/* add custom signed attributes if set */
if (pkcs7->signedAttribsSz > 0 && pkcs7->signedAttribs != NULL) {
esd->signedAttribsCount += pkcs7->signedAttribsSz;
#ifdef NO_ASN_TIME
esd->signedAttribsSz += EncodeAttributes(&esd->signedAttribs[2], 4,
pkcs7->signedAttribs, pkcs7->signedAttribsSz);
#else
esd->signedAttribsSz += EncodeAttributes(&esd->signedAttribs[3], 4,
pkcs7->signedAttribs, pkcs7->signedAttribsSz);
#endif
}
#ifdef NO_ASN_TIME
(void)signingTimeOidSz;
(void)signingTime;
(void)signingTimeSz;
#endif
return 0;
}
/* gets correct encryption algo ID for SignedData, either CTC_<hash>wRSA or
* CTC_<hash>wECDSA, from pkcs7->publicKeyOID and pkcs7->hashOID.
*
* pkcs7 - pointer to PKCS7 structure
* digEncAlgoId - [OUT] output int to store correct algo ID in
* digEncAlgoType - [OUT] output for algo ID type
*
* return 0 on success, negative on error */
static int wc_PKCS7_SignedDataGetEncAlgoId(PKCS7* pkcs7, int* digEncAlgoId,
int* digEncAlgoType)
{
int algoId = 0;
int algoType = 0;
if (pkcs7 == NULL || digEncAlgoId == NULL || digEncAlgoType == NULL)
return BAD_FUNC_ARG;
if (pkcs7->publicKeyOID == RSAk) {
algoType = oidSigType;
switch (pkcs7->hashOID) {
#ifndef NO_SHA
case SHAh:
algoId = CTC_SHAwRSA;
break;
#endif
#ifdef WOLFSSL_SHA224
case SHA224h:
algoId = CTC_SHA224wRSA;
break;
#endif
#ifndef NO_SHA256
case SHA256h:
algoId = CTC_SHA256wRSA;
break;
#endif
#ifdef WOLFSSL_SHA384
case SHA384h:
algoId = CTC_SHA384wRSA;
break;
#endif
#ifdef WOLFSSL_SHA512
case SHA512h:
algoId = CTC_SHA512wRSA;
break;
#endif
}
}
#ifdef HAVE_ECC
else if (pkcs7->publicKeyOID == ECDSAk) {
algoType = oidSigType;
switch (pkcs7->hashOID) {
#ifndef NO_SHA
case SHAh:
algoId = CTC_SHAwECDSA;
break;
#endif
#ifdef WOLFSSL_SHA224
case SHA224h:
algoId = CTC_SHA224wECDSA;
break;
#endif
#ifndef NO_SHA256
case SHA256h:
algoId = CTC_SHA256wECDSA;
break;
#endif
#ifdef WOLFSSL_SHA384
case SHA384h:
algoId = CTC_SHA384wECDSA;
break;
#endif
#ifdef WOLFSSL_SHA512
case SHA512h:
algoId = CTC_SHA512wECDSA;
break;
#endif
}
}
#endif /* HAVE_ECC */
if (algoId == 0) {
WOLFSSL_MSG("Invalid signature algorithm type");
return BAD_FUNC_ARG;
}
*digEncAlgoId = algoId;
*digEncAlgoType = algoType;
return 0;
}
/* build SignedData DigestInfo for use with PKCS#7/RSA
*
* pkcs7 - pointer to initialized PKCS7 struct
* flatSignedAttribs - flattened, signed attributes
* flatSignedAttrbsSz - size of flatSignedAttribs, octets
* esd - pointer to initialized ESD struct
* digestInfo - [OUT] output array for DigestInfo
* digestInfoSz - [IN/OUT] - input size of array, size of digestInfo
*
* return 0 on success, negative on error */
static int wc_PKCS7_BuildDigestInfo(PKCS7* pkcs7, byte* flatSignedAttribs,
word32 flatSignedAttribsSz, ESD* esd,
byte* digestInfo, word32* digestInfoSz)
{
int ret, hashSz, digIdx = 0;
byte digestInfoSeq[MAX_SEQ_SZ];
byte digestStr[MAX_OCTET_STR_SZ];
byte attribSet[MAX_SET_SZ];
byte algoId[MAX_ALGO_SZ];
word32 digestInfoSeqSz, digestStrSz, algoIdSz;
word32 attribSetSz;
if (pkcs7 == NULL || esd == NULL || digestInfo == NULL ||
digestInfoSz == NULL) {
return BAD_FUNC_ARG;
}
hashSz = wc_HashGetDigestSize(esd->hashType);
if (hashSz < 0)
return hashSz;
if (flatSignedAttribsSz != 0) {
if (flatSignedAttribs == NULL)
return BAD_FUNC_ARG;
attribSetSz = SetSet(flatSignedAttribsSz, attribSet);
ret = wc_HashInit(&esd->hash, esd->hashType);
if (ret < 0)
return ret;
ret = wc_HashUpdate(&esd->hash, esd->hashType,
attribSet, attribSetSz);
if (ret == 0)
ret = wc_HashUpdate(&esd->hash, esd->hashType,
flatSignedAttribs, flatSignedAttribsSz);
if (ret == 0)
ret = wc_HashFinal(&esd->hash, esd->hashType,
esd->contentAttribsDigest);
wc_HashFree(&esd->hash, esd->hashType);
if (ret < 0)
return ret;
} else {
/* when no attrs, digest is contentDigest without tag and length */
XMEMCPY(esd->contentAttribsDigest, esd->contentDigest + 2, hashSz);
}
/* set algoID, with NULL attributes */
algoIdSz = SetAlgoID(pkcs7->hashOID, algoId, oidHashType, 0);
digestStrSz = SetOctetString(hashSz, digestStr);
digestInfoSeqSz = SetSequence(algoIdSz + digestStrSz + hashSz,
digestInfoSeq);
if (*digestInfoSz < (digestInfoSeqSz + algoIdSz + digestStrSz + hashSz)) {
return BUFFER_E;
}
XMEMCPY(digestInfo + digIdx, digestInfoSeq, digestInfoSeqSz);
digIdx += digestInfoSeqSz;
XMEMCPY(digestInfo + digIdx, algoId, algoIdSz);
digIdx += algoIdSz;
XMEMCPY(digestInfo + digIdx, digestStr, digestStrSz);
digIdx += digestStrSz;
XMEMCPY(digestInfo + digIdx, esd->contentAttribsDigest, hashSz);
digIdx += hashSz;
*digestInfoSz = digIdx;
return 0;
}
/* build SignedData signature over DigestInfo or content digest
*
* pkcs7 - pointer to initialized PKCS7 struct
* flatSignedAttribs - flattened, signed attributes
* flatSignedAttribsSz - size of flatSignedAttribs, octets
* esd - pointer to initialized ESD struct
*
* returns length of signature on success, negative on error */
static int wc_PKCS7_SignedDataBuildSignature(PKCS7* pkcs7,
byte* flatSignedAttribs,
word32 flatSignedAttribsSz,
ESD* esd)
{
int ret = 0;
#ifdef HAVE_ECC
int hashSz = 0;
#endif
word32 digestInfoSz = MAX_PKCS7_DIGEST_SZ;
#ifdef WOLFSSL_SMALL_STACK
byte* digestInfo;
#else
byte digestInfo[MAX_PKCS7_DIGEST_SZ];
#endif
if (pkcs7 == NULL || esd == NULL)
return BAD_FUNC_ARG;
#ifdef WOLFSSL_SMALL_STACK
digestInfo = (byte*)XMALLOC(digestInfoSz, pkcs7->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (digestInfo == NULL) {
return MEMORY_E;
}
#endif
XMEMSET(digestInfo, 0, digestInfoSz);
ret = wc_PKCS7_BuildDigestInfo(pkcs7, flatSignedAttribs,
flatSignedAttribsSz, esd, digestInfo,
&digestInfoSz);
if (ret < 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(digestInfo, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ret;
}
/* sign digestInfo */
switch (pkcs7->publicKeyOID) {
#ifndef NO_RSA
case RSAk:
ret = wc_PKCS7_RsaSign(pkcs7, digestInfo, digestInfoSz, esd);
break;
#endif
#ifdef HAVE_ECC
case ECDSAk:
/* CMS with ECDSA does not sign DigestInfo structure
* like PKCS#7 with RSA does */
hashSz = wc_HashGetDigestSize(esd->hashType);
if (hashSz < 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(digestInfo, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return hashSz;
}
ret = wc_PKCS7_EcdsaSign(pkcs7, esd->contentAttribsDigest,
hashSz, esd);
break;
#endif
default:
WOLFSSL_MSG("Unsupported public key type");
ret = BAD_FUNC_ARG;
}
#ifdef WOLFSSL_SMALL_STACK
XFREE(digestInfo, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
if (ret >= 0) {
esd->encContentDigestSz = (word32)ret;
}
return ret;
}
/* build PKCS#7 signedData content type */
static int PKCS7_EncodeSigned(PKCS7* pkcs7, ESD* esd,
const byte* hashBuf, word32 hashSz, byte* output, word32* outputSz,
byte* output2, word32* output2Sz)
{
/* contentType OID (1.2.840.113549.1.9.3) */
const byte contentTypeOid[] =
{ ASN_OBJECT_ID, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xF7, 0x0d, 0x01,
0x09, 0x03 };
/* messageDigest OID (1.2.840.113549.1.9.4) */
const byte messageDigestOid[] =
{ ASN_OBJECT_ID, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01,
0x09, 0x04 };
/* signingTime OID () */
byte signingTimeOid[] =
{ ASN_OBJECT_ID, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01,
0x09, 0x05};
Pkcs7Cert* certPtr = NULL;
word32 certSetSz = 0;
word32 signerInfoSz = 0;
word32 totalSz, total2Sz;
int idx = 0, ret = 0;
int digEncAlgoId, digEncAlgoType;
byte* flatSignedAttribs = NULL;
word32 flatSignedAttribsSz = 0;
byte signedDataOid[MAX_OID_SZ];
word32 signedDataOidSz;
byte signingTime[MAX_TIME_STRING_SZ];
if (pkcs7 == NULL || pkcs7->contentSz == 0 ||
pkcs7->encryptOID == 0 || pkcs7->hashOID == 0 || pkcs7->rng == 0 ||
output == NULL || outputSz == NULL || *outputSz == 0 || hashSz == 0 ||
hashBuf == NULL) {
return BAD_FUNC_ARG;
}
/* verify the hash size matches */
#ifdef WOLFSSL_SMALL_STACK
esd = (ESD*)XMALLOC(sizeof(ESD), pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
if (esd == NULL)
return MEMORY_E;
#endif
XMEMSET(esd, 0, sizeof(ESD));
/* set content type based on contentOID, unless user has set custom one
with wc_PKCS7_SetContentType() */
if (pkcs7->contentTypeSz == 0) {
/* default to DATA content type if user has not set */
if (pkcs7->contentOID == 0) {
pkcs7->contentOID = DATA;
}
ret = wc_SetContentType(pkcs7->contentOID, pkcs7->contentType,
sizeof(pkcs7->contentType));
if (ret < 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(esd, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ret;
}
pkcs7->contentTypeSz = ret;
}
/* set signedData outer content type */
ret = wc_SetContentType(SIGNED_DATA, signedDataOid, sizeof(signedDataOid));
if (ret < 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(esd, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ret;
}
signedDataOidSz = ret;
esd->hashType = wc_OidGetHash(pkcs7->hashOID);
if (wc_HashGetDigestSize(esd->hashType) != (int)hashSz) {
WOLFSSL_MSG("hashSz did not match hashOID");
#ifdef WOLFSSL_SMALL_STACK
XFREE(esd, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return BUFFER_E;
}
/* include hash */
esd->contentDigest[0] = ASN_OCTET_STRING;
esd->contentDigest[1] = (byte)hashSz;
XMEMCPY(&esd->contentDigest[2], hashBuf, hashSz);
if (pkcs7->detached == 1) {
/* do not include content if generating detached signature */
esd->innerOctetsSz = 0;
esd->innerContSeqSz = 0;
esd->contentInfoSeqSz = SetSequence(pkcs7->contentTypeSz,
esd->contentInfoSeq);
} else {
esd->innerOctetsSz = SetOctetString(pkcs7->contentSz, esd->innerOctets);
esd->innerContSeqSz = SetExplicit(0, esd->innerOctetsSz +
pkcs7->contentSz, esd->innerContSeq);
esd->contentInfoSeqSz = SetSequence(pkcs7->contentSz +
esd->innerOctetsSz + pkcs7->contentTypeSz +
esd->innerContSeqSz, esd->contentInfoSeq);
}
/* SignerIdentifier */
if (pkcs7->sidType == CMS_ISSUER_AND_SERIAL_NUMBER) {
/* IssuerAndSerialNumber */
esd->issuerSnSz = SetSerialNumber(pkcs7->issuerSn, pkcs7->issuerSnSz,
esd->issuerSn, MAX_SN_SZ);
signerInfoSz += esd->issuerSnSz;
esd->issuerNameSz = SetSequence(pkcs7->issuerSz, esd->issuerName);
signerInfoSz += esd->issuerNameSz + pkcs7->issuerSz;
esd->issuerSnSeqSz = SetSequence(signerInfoSz, esd->issuerSnSeq);
signerInfoSz += esd->issuerSnSeqSz;
/* version MUST be 1 */
esd->signerVersionSz = SetMyVersion(1, esd->signerVersion, 0);
} else if (pkcs7->sidType == CMS_SKID) {
/* SubjectKeyIdentifier */
esd->issuerSKIDSz = SetOctetString(KEYID_SIZE, esd->issuerSKID);
esd->issuerSKIDSeqSz = SetExplicit(0, esd->issuerSKIDSz + KEYID_SIZE,
esd->issuerSKIDSeq);
signerInfoSz += (esd->issuerSKIDSz + esd->issuerSKIDSeqSz +
KEYID_SIZE);
/* version MUST be 3 */
esd->signerVersionSz = SetMyVersion(3, esd->signerVersion, 0);
} else {
#ifdef WOLFSSL_SMALL_STACK
XFREE(esd, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return SKID_E;
}
signerInfoSz += esd->signerVersionSz;
esd->signerDigAlgoIdSz = SetAlgoID(pkcs7->hashOID, esd->signerDigAlgoId,
oidHashType, 0);
signerInfoSz += esd->signerDigAlgoIdSz;
/* set signatureAlgorithm */
ret = wc_PKCS7_SignedDataGetEncAlgoId(pkcs7, &digEncAlgoId,
&digEncAlgoType);
if (ret < 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(esd, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ret;
}
esd->digEncAlgoIdSz = SetAlgoID(digEncAlgoId, esd->digEncAlgoId,
digEncAlgoType, 0);
signerInfoSz += esd->digEncAlgoIdSz;
/* build up signed attributes, include contentType, signingTime, and
messageDigest by default */
ret = wc_PKCS7_BuildSignedAttributes(pkcs7, esd, pkcs7->contentType,
pkcs7->contentTypeSz,
contentTypeOid, sizeof(contentTypeOid),
messageDigestOid, sizeof(messageDigestOid),
signingTimeOid, sizeof(signingTimeOid),
signingTime, sizeof(signingTime));
if (ret < 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(esd, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ret;
}
if (esd->signedAttribsSz > 0) {
flatSignedAttribs = (byte*)XMALLOC(esd->signedAttribsSz, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
flatSignedAttribsSz = esd->signedAttribsSz;
if (flatSignedAttribs == NULL) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(esd, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return MEMORY_E;
}
FlattenAttributes(flatSignedAttribs,
esd->signedAttribs, esd->signedAttribsCount);
esd->signedAttribSetSz = SetImplicit(ASN_SET, 0, esd->signedAttribsSz,
esd->signedAttribSet);
} else {
esd->signedAttribSetSz = 0;
}
/* Calculate the final hash and encrypt it. */
ret = wc_PKCS7_SignedDataBuildSignature(pkcs7, flatSignedAttribs,
flatSignedAttribsSz, esd);
if (ret < 0) {
if (pkcs7->signedAttribsSz != 0)
XFREE(flatSignedAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#ifdef WOLFSSL_SMALL_STACK
XFREE(esd, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ret;
}
signerInfoSz += flatSignedAttribsSz + esd->signedAttribSetSz;
esd->signerDigestSz = SetOctetString(esd->encContentDigestSz,
esd->signerDigest);
signerInfoSz += esd->signerDigestSz + esd->encContentDigestSz;
esd->signerInfoSeqSz = SetSequence(signerInfoSz, esd->signerInfoSeq);
signerInfoSz += esd->signerInfoSeqSz;
esd->signerInfoSetSz = SetSet(signerInfoSz, esd->signerInfoSet);
signerInfoSz += esd->signerInfoSetSz;
/* certificates [0] IMPLICIT CertificateSet */
/* get total certificates size */
certPtr = pkcs7->certList;
while (certPtr != NULL) {
certSetSz += certPtr->derSz;
certPtr = certPtr->next;
}
certPtr = NULL;
esd->certsSetSz = SetImplicit(ASN_SET, 0, certSetSz, esd->certsSet);
esd->singleDigAlgoIdSz = SetAlgoID(pkcs7->hashOID, esd->singleDigAlgoId,
oidHashType, 0);
esd->digAlgoIdSetSz = SetSet(esd->singleDigAlgoIdSz, esd->digAlgoIdSet);
esd->versionSz = SetMyVersion(1, esd->version, 0);
totalSz = esd->versionSz + esd->singleDigAlgoIdSz + esd->digAlgoIdSetSz +
esd->contentInfoSeqSz + pkcs7->contentTypeSz +
esd->innerContSeqSz + esd->innerOctetsSz + pkcs7->contentSz;
total2Sz = esd->certsSetSz + certSetSz + signerInfoSz;
if (pkcs7->detached) {
totalSz -= pkcs7->contentSz;
}
esd->innerSeqSz = SetSequence(totalSz + total2Sz, esd->innerSeq);
totalSz += esd->innerSeqSz;
esd->outerContentSz = SetExplicit(0, totalSz + total2Sz, esd->outerContent);
totalSz += esd->outerContentSz + signedDataOidSz;
esd->outerSeqSz = SetSequence(totalSz + total2Sz, esd->outerSeq);
totalSz += esd->outerSeqSz;
/* if using header/footer, we are not returning the content */
if (output2 && output2Sz) {
if (total2Sz > *output2Sz) {
if (pkcs7->signedAttribsSz != 0)
XFREE(flatSignedAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#ifdef WOLFSSL_SMALL_STACK
XFREE(esd, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return BUFFER_E;
}
if (!pkcs7->detached) {
totalSz -= pkcs7->contentSz;
}
}
else {
/* if using single output buffer include content and footer */
totalSz += total2Sz;
}
if (totalSz > *outputSz) {
if (pkcs7->signedAttribsSz != 0)
XFREE(flatSignedAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#ifdef WOLFSSL_SMALL_STACK
XFREE(esd, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return BUFFER_E;
}
idx = 0;
XMEMCPY(output + idx, esd->outerSeq, esd->outerSeqSz);
idx += esd->outerSeqSz;
XMEMCPY(output + idx, signedDataOid, signedDataOidSz);
idx += signedDataOidSz;
XMEMCPY(output + idx, esd->outerContent, esd->outerContentSz);
idx += esd->outerContentSz;
XMEMCPY(output + idx, esd->innerSeq, esd->innerSeqSz);
idx += esd->innerSeqSz;
XMEMCPY(output + idx, esd->version, esd->versionSz);
idx += esd->versionSz;
XMEMCPY(output + idx, esd->digAlgoIdSet, esd->digAlgoIdSetSz);
idx += esd->digAlgoIdSetSz;
XMEMCPY(output + idx, esd->singleDigAlgoId, esd->singleDigAlgoIdSz);
idx += esd->singleDigAlgoIdSz;
XMEMCPY(output + idx, esd->contentInfoSeq, esd->contentInfoSeqSz);
idx += esd->contentInfoSeqSz;
XMEMCPY(output + idx, pkcs7->contentType, pkcs7->contentTypeSz);
idx += pkcs7->contentTypeSz;
XMEMCPY(output + idx, esd->innerContSeq, esd->innerContSeqSz);
idx += esd->innerContSeqSz;
XMEMCPY(output + idx, esd->innerOctets, esd->innerOctetsSz);
idx += esd->innerOctetsSz;
/* support returning header and footer without content */
if (output2 && output2Sz) {
*outputSz = idx;
idx = 0;
}
else {
if (!pkcs7->detached) {
XMEMCPY(output + idx, pkcs7->content, pkcs7->contentSz);
idx += pkcs7->contentSz;
}
output2 = output;
}
/* certificates */
XMEMCPY(output2 + idx, esd->certsSet, esd->certsSetSz);
idx += esd->certsSetSz;
certPtr = pkcs7->certList;
while (certPtr != NULL) {
XMEMCPY(output2 + idx, certPtr->der, certPtr->derSz);
idx += certPtr->derSz;
certPtr = certPtr->next;
}
wc_PKCS7_FreeCertSet(pkcs7);
XMEMCPY(output2 + idx, esd->signerInfoSet, esd->signerInfoSetSz);
idx += esd->signerInfoSetSz;
XMEMCPY(output2 + idx, esd->signerInfoSeq, esd->signerInfoSeqSz);
idx += esd->signerInfoSeqSz;
XMEMCPY(output2 + idx, esd->signerVersion, esd->signerVersionSz);
idx += esd->signerVersionSz;
/* SignerIdentifier */
if (pkcs7->sidType == CMS_ISSUER_AND_SERIAL_NUMBER) {
/* IssuerAndSerialNumber */
XMEMCPY(output2 + idx, esd->issuerSnSeq, esd->issuerSnSeqSz);
idx += esd->issuerSnSeqSz;
XMEMCPY(output2 + idx, esd->issuerName, esd->issuerNameSz);
idx += esd->issuerNameSz;
XMEMCPY(output2 + idx, pkcs7->issuer, pkcs7->issuerSz);
idx += pkcs7->issuerSz;
XMEMCPY(output2 + idx, esd->issuerSn, esd->issuerSnSz);
idx += esd->issuerSnSz;
} else if (pkcs7->sidType == CMS_SKID) {
/* SubjectKeyIdentifier */
XMEMCPY(output2 + idx, esd->issuerSKIDSeq, esd->issuerSKIDSeqSz);
idx += esd->issuerSKIDSeqSz;
XMEMCPY(output2 + idx, esd->issuerSKID, esd->issuerSKIDSz);
idx += esd->issuerSKIDSz;
XMEMCPY(output2 + idx, pkcs7->issuerSubjKeyId, KEYID_SIZE);
idx += KEYID_SIZE;
} else {
#ifdef WOLFSSL_SMALL_STACK
XFREE(esd, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return SKID_E;
}
XMEMCPY(output2 + idx, esd->signerDigAlgoId, esd->signerDigAlgoIdSz);
idx += esd->signerDigAlgoIdSz;
/* SignerInfo:Attributes */
if (flatSignedAttribsSz > 0) {
XMEMCPY(output2 + idx, esd->signedAttribSet, esd->signedAttribSetSz);
idx += esd->signedAttribSetSz;
XMEMCPY(output2 + idx, flatSignedAttribs, flatSignedAttribsSz);
idx += flatSignedAttribsSz;
XFREE(flatSignedAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
}
XMEMCPY(output2 + idx, esd->digEncAlgoId, esd->digEncAlgoIdSz);
idx += esd->digEncAlgoIdSz;
XMEMCPY(output2 + idx, esd->signerDigest, esd->signerDigestSz);
idx += esd->signerDigestSz;
XMEMCPY(output2 + idx, esd->encContentDigest, esd->encContentDigestSz);
idx += esd->encContentDigestSz;
if (output2 && output2Sz) {
*output2Sz = idx;
idx = 0; /* success */
}
else {
*outputSz = idx;
}
#ifdef WOLFSSL_SMALL_STACK
XFREE(esd, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return idx;
}
/* hashBuf: The computed digest for the pkcs7->content
* hashSz: The size of computed digest for the pkcs7->content based on hashOID
* outputHead: The PKCS7 header that goes on top of the raw data signed.
* outputFoot: The PKCS7 footer that goes at the end of the raw data signed.
* pkcs7->content: Not used
* pkcs7->contentSz: Must be provided as actual sign of raw data
* return codes: 0=success, negative=error
*/
int wc_PKCS7_EncodeSignedData_ex(PKCS7* pkcs7, const byte* hashBuf, word32 hashSz,
byte* outputHead, word32* outputHeadSz, byte* outputFoot, word32* outputFootSz)
{
int ret;
#ifdef WOLFSSL_SMALL_STACK
ESD* esd;
#else
ESD esd[1];
#endif
/* other args checked in wc_PKCS7_EncodeSigned_ex */
if (pkcs7 == NULL || outputFoot == NULL || outputFootSz == NULL) {
return BAD_FUNC_ARG;
}
#ifdef WOLFSSL_SMALL_STACK
esd = (ESD*)XMALLOC(sizeof(ESD), pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
if (esd == NULL)
return MEMORY_E;
#endif
XMEMSET(esd, 0, sizeof(ESD));
ret = PKCS7_EncodeSigned(pkcs7, esd, hashBuf, hashSz,
outputHead, outputHeadSz, outputFoot, outputFootSz);
#ifdef WOLFSSL_SMALL_STACK
XFREE(esd, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ret;
}
/* Toggle detached signature mode on/off for PKCS#7/CMS SignedData content type.
* By default wolfCrypt includes the data to be signed in the SignedData
* bundle. This data can be omitted in the case when a detached signature is
* being created. To enable generation of detached signatures, set flag to "1",
* otherwise set to "0":
*
* flag 1 turns on support
* flag 0 turns off support
*
* pkcs7 - pointer to initialized PKCS7 structure
* flag - turn on/off detached signature generation (1 or 0)
*
* Returns 0 on success, negative upon error. */
int wc_PKCS7_SetDetached(PKCS7* pkcs7, word16 flag)
{
if (pkcs7 == NULL || (flag != 0 && flag != 1))
return BAD_FUNC_ARG;
pkcs7->detached = flag;
return 0;
}
/* By default, SignedData bundles have the following signed attributes attached:
* contentType (1.2.840.113549.1.9.3)
* signgingTime (1.2.840.113549.1.9.5)
* messageDigest (1.2.840.113549.1.9.4)
*
* Calling this API before wc_PKCS7_EncodeSignedData() will disable the
* inclusion of those attributes.
*
* pkcs7 - pointer to initialized PKCS7 structure
*
* Returns 0 on success, negative upon error. */
int wc_PKCS7_NoDefaultSignedAttribs(PKCS7* pkcs7)
{
if (pkcs7 == NULL)
return BAD_FUNC_ARG;
pkcs7->skipDefaultSignedAttribs = 1;
return 0;
}
/* return codes: >0: Size of signed PKCS7 output buffer, negative: error */
int wc_PKCS7_EncodeSignedData(PKCS7* pkcs7, byte* output, word32 outputSz)
{
int ret;
int hashSz;
enum wc_HashType hashType;
byte hashBuf[WC_MAX_DIGEST_SIZE];
#ifdef WOLFSSL_SMALL_STACK
ESD* esd;
#else
ESD esd[1];
#endif
/* other args checked in wc_PKCS7_EncodeSigned_ex */
if (pkcs7 == NULL || pkcs7->contentSz == 0 || pkcs7->content == NULL) {
return BAD_FUNC_ARG;
}
/* get hash type and size, validate hashOID */
hashType = wc_OidGetHash(pkcs7->hashOID);
hashSz = wc_HashGetDigestSize(hashType);
if (hashSz < 0)
return hashSz;
#ifdef WOLFSSL_SMALL_STACK
esd = (ESD*)XMALLOC(sizeof(ESD), pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
if (esd == NULL)
return MEMORY_E;
#endif
XMEMSET(esd, 0, sizeof(ESD));
esd->hashType = hashType;
/* calculate hash for content */
ret = wc_HashInit(&esd->hash, esd->hashType);
if (ret == 0) {
ret = wc_HashUpdate(&esd->hash, esd->hashType,
pkcs7->content, pkcs7->contentSz);
if (ret == 0) {
ret = wc_HashFinal(&esd->hash, esd->hashType, hashBuf);
}
wc_HashFree(&esd->hash, esd->hashType);
}
if (ret == 0) {
ret = PKCS7_EncodeSigned(pkcs7, esd, hashBuf, hashSz,
output, &outputSz, NULL, NULL);
}
#ifdef WOLFSSL_SMALL_STACK
XFREE(esd, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ret;
}
/* Single-shot API to generate a CMS SignedData bundle that encapsulates a
* content of type FirmwarePkgData. Any recipient certificates should be
* loaded into the PKCS7 structure prior to calling this function, using
* wc_PKCS7_InitWithCert() and/or wc_PKCS7_AddCertificate().
*
* pkcs7 - pointer to initialized PKCS7 struct
* privateKey - private RSA/ECC key, used for signing SignedData
* privateKeySz - size of privateKey, octets
* signOID - public key algorithm OID, used for sign operation
* hashOID - hash algorithm OID, used for signature generation
* content - content to be encapsulated, of type FirmwarePkgData
* contentSz - size of content, octets
* signedAttribs - optional signed attributes
* signedAttribsSz - number of PKCS7Attrib members in signedAttribs
* output - output buffer for final bundle
* outputSz - size of output buffer, octets
*
* Returns length of generated bundle on success, negative upon error. */
int wc_PKCS7_EncodeSignedFPD(PKCS7* pkcs7, byte* privateKey,
word32 privateKeySz, int signOID, int hashOID,
byte* content, word32 contentSz,
PKCS7Attrib* signedAttribs, word32 signedAttribsSz,
byte* output, word32 outputSz)
{
int ret = 0;
WC_RNG rng;
if (pkcs7 == NULL || privateKey == NULL || privateKeySz == 0 ||
content == NULL || contentSz == 0 || output == NULL || outputSz == 0)
return BAD_FUNC_ARG;
ret = wc_InitRng(&rng);
if (ret != 0)
return ret;
pkcs7->rng = &rng;
pkcs7->content = content;
pkcs7->contentSz = contentSz;
pkcs7->contentOID = FIRMWARE_PKG_DATA;
pkcs7->hashOID = hashOID;
pkcs7->encryptOID = signOID;
pkcs7->privateKey = privateKey;
pkcs7->privateKeySz = privateKeySz;
pkcs7->signedAttribs = signedAttribs;
pkcs7->signedAttribsSz = signedAttribsSz;
ret = wc_PKCS7_EncodeSignedData(pkcs7, output, outputSz);
if (ret <= 0) {
WOLFSSL_MSG("Error encoding CMS SignedData content type");
wc_FreeRng(&rng);
return ret;
}
wc_FreeRng(&rng);
return ret;
}
#ifndef NO_PKCS7_ENCRYPTED_DATA
/* Single-shot API to generate a CMS SignedData bundle that encapsulates a
* CMS EncryptedData bundle. Content of inner EncryptedData is set to that
* of FirmwarePkgData. Any recipient certificates should be loaded into the
* PKCS7 structure prior to calling this function, using wc_PKCS7_InitWithCert()
* and/or wc_PKCS7_AddCertificate().
*
* pkcs7 - pointer to initialized PKCS7 struct
* encryptKey - encryption key used for encrypting EncryptedData
* encryptKeySz - size of encryptKey, octets
* privateKey - private RSA/ECC key, used for signing SignedData
* privateKeySz - size of privateKey, octets
* encryptOID - encryption algorithm OID, to be used as encryption
* algorithm for EncryptedData
* signOID - public key algorithm OID, to be used for sign
* operation in SignedData generation
* hashOID - hash algorithm OID, to be used for signature in
* SignedData generation
* content - content to be encapsulated
* contentSz - size of content, octets
* unprotectedAttribs - optional unprotected attributes, for EncryptedData
* unprotectedAttribsSz - number of PKCS7Attrib members in unprotectedAttribs
* signedAttribs - optional signed attributes, for SignedData
* signedAttribsSz - number of PKCS7Attrib members in signedAttribs
* output - output buffer for final bundle
* outputSz - size of output buffer, octets
*
* Returns length of generated bundle on success, negative upon error. */
int wc_PKCS7_EncodeSignedEncryptedFPD(PKCS7* pkcs7, byte* encryptKey,
word32 encryptKeySz, byte* privateKey,
word32 privateKeySz, int encryptOID,
int signOID, int hashOID,
byte* content, word32 contentSz,
PKCS7Attrib* unprotectedAttribs,
word32 unprotectedAttribsSz,
PKCS7Attrib* signedAttribs,
word32 signedAttribsSz,
byte* output, word32 outputSz)
{
int ret = 0, encryptedSz = 0;
byte* encrypted = NULL;
WC_RNG rng;
if (pkcs7 == NULL || encryptKey == NULL || encryptKeySz == 0 ||
privateKey == NULL || privateKeySz == 0 || content == NULL ||
contentSz == 0 || output == NULL || outputSz == 0) {
return BAD_FUNC_ARG;
}
/* 1: build up EncryptedData using FirmwarePkgData type, use output
* buffer as tmp for storage and to get size */
/* set struct elements, inner content type is FirmwarePkgData */
pkcs7->content = content;
pkcs7->contentSz = contentSz;
pkcs7->contentOID = FIRMWARE_PKG_DATA;
pkcs7->encryptOID = encryptOID;
pkcs7->encryptionKey = encryptKey;
pkcs7->encryptionKeySz = encryptKeySz;
pkcs7->unprotectedAttribs = unprotectedAttribs;
pkcs7->unprotectedAttribsSz = unprotectedAttribsSz;
encryptedSz = wc_PKCS7_EncodeEncryptedData(pkcs7, output, outputSz);
if (encryptedSz < 0) {
WOLFSSL_MSG("Error encoding CMS EncryptedData content type");
return encryptedSz;
}
/* save encryptedData, reset output buffer and struct */
encrypted = (byte*)XMALLOC(encryptedSz, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (encrypted == NULL) {
ForceZero(output, outputSz);
return MEMORY_E;
}
XMEMCPY(encrypted, output, encryptedSz);
ForceZero(output, outputSz);
ret = wc_InitRng(&rng);
if (ret != 0) {
ForceZero(encrypted, encryptedSz);
XFREE(encrypted, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
/* 2: build up SignedData, encapsulating EncryptedData */
pkcs7->rng = &rng;
pkcs7->content = encrypted;
pkcs7->contentSz = encryptedSz;
pkcs7->contentOID = ENCRYPTED_DATA;
pkcs7->hashOID = hashOID;
pkcs7->encryptOID = signOID;
pkcs7->privateKey = privateKey;
pkcs7->privateKeySz = privateKeySz;
pkcs7->signedAttribs = signedAttribs;
pkcs7->signedAttribsSz = signedAttribsSz;
ret = wc_PKCS7_EncodeSignedData(pkcs7, output, outputSz);
if (ret <= 0) {
WOLFSSL_MSG("Error encoding CMS SignedData content type");
ForceZero(encrypted, encryptedSz);
XFREE(encrypted, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
wc_FreeRng(&rng);
return ret;
}
ForceZero(encrypted, encryptedSz);
XFREE(encrypted, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
wc_FreeRng(&rng);
return ret;
}
#endif /* NO_PKCS7_ENCRYPTED_DATA */
#if defined(HAVE_LIBZ) && !defined(NO_PKCS7_COMPRESSED_DATA)
/* Single-shot API to generate a CMS SignedData bundle that encapsulates a
* CMS CompressedData bundle. Content of inner CompressedData is set to that
* of FirmwarePkgData. Any recipient certificates should be loaded into the
* PKCS7 structure prior to calling this function, using wc_PKCS7_InitWithCert()
* and/or wc_PKCS7_AddCertificate().
*
* pkcs7 - pointer to initialized PKCS7 struct
* privateKey - private RSA/ECC key, used for signing SignedData
* privateKeySz - size of privateKey, octets
* signOID - public key algorithm OID, to be used for sign
* operation in SignedData generation
* hashOID - hash algorithm OID, to be used for signature in
* SignedData generation
* content - content to be encapsulated
* contentSz - size of content, octets
* signedAttribs - optional signed attributes, for SignedData
* signedAttribsSz - number of PKCS7Attrib members in signedAttribs
* output - output buffer for final bundle
* outputSz - size of output buffer, octets
*
* Returns length of generated bundle on success, negative upon error. */
int wc_PKCS7_EncodeSignedCompressedFPD(PKCS7* pkcs7, byte* privateKey,
word32 privateKeySz, int signOID,
int hashOID, byte* content,
word32 contentSz,
PKCS7Attrib* signedAttribs,
word32 signedAttribsSz, byte* output,
word32 outputSz)
{
int ret = 0, compressedSz = 0;
byte* compressed = NULL;
WC_RNG rng;
if (pkcs7 == NULL || privateKey == NULL || privateKeySz == 0 ||
content == NULL || contentSz == 0 || output == NULL || outputSz == 0) {
return BAD_FUNC_ARG;
}
/* 1: build up CompressedData using FirmwarePkgData type, use output
* buffer as tmp for storage and to get size */
/* set struct elements, inner content type is FirmwarePkgData */
pkcs7->content = content;
pkcs7->contentSz = contentSz;
pkcs7->contentOID = FIRMWARE_PKG_DATA;
compressedSz = wc_PKCS7_EncodeCompressedData(pkcs7, output, outputSz);
if (compressedSz < 0) {
WOLFSSL_MSG("Error encoding CMS CompressedData content type");
return compressedSz;
}
/* save compressedData, reset output buffer and struct */
compressed = (byte*)XMALLOC(compressedSz, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (compressed == NULL) {
ForceZero(output, outputSz);
return MEMORY_E;
}
XMEMCPY(compressed, output, compressedSz);
ForceZero(output, outputSz);
ret = wc_InitRng(&rng);
if (ret != 0) {
ForceZero(compressed, compressedSz);
XFREE(compressed, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
/* 2: build up SignedData, encapsulating EncryptedData */
pkcs7->rng = &rng;
pkcs7->content = compressed;
pkcs7->contentSz = compressedSz;
pkcs7->contentOID = COMPRESSED_DATA;
pkcs7->hashOID = hashOID;
pkcs7->encryptOID = signOID;
pkcs7->privateKey = privateKey;
pkcs7->privateKeySz = privateKeySz;
pkcs7->signedAttribs = signedAttribs;
pkcs7->signedAttribsSz = signedAttribsSz;
ret = wc_PKCS7_EncodeSignedData(pkcs7, output, outputSz);
if (ret <= 0) {
WOLFSSL_MSG("Error encoding CMS SignedData content type");
ForceZero(compressed, compressedSz);
XFREE(compressed, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
wc_FreeRng(&rng);
return ret;
}
ForceZero(compressed, compressedSz);
XFREE(compressed, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
wc_FreeRng(&rng);
return ret;
}
#ifndef NO_PKCS7_ENCRYPTED_DATA
/* Single-shot API to generate a CMS SignedData bundle that encapsulates a
* CMS EncryptedData bundle, which then encapsulates a CMS CompressedData
* bundle. Content of inner CompressedData is set to that of FirmwarePkgData.
* Any recipient certificates should be loaded into the PKCS7 structure prior
* to calling this function, using wc_PKCS7_InitWithCert() and/or
* wc_PKCS7_AddCertificate().
*
* pkcs7 - pointer to initialized PKCS7 struct
* encryptKey - encryption key used for encrypting EncryptedData
* encryptKeySz - size of encryptKey, octets
* privateKey - private RSA/ECC key, used for signing SignedData
* privateKeySz - size of privateKey, octets
* encryptOID - encryption algorithm OID, to be used as encryption
* algorithm for EncryptedData
* signOID - public key algorithm OID, to be used for sign
* operation in SignedData generation
* hashOID - hash algorithm OID, to be used for signature in
* SignedData generation
* content - content to be encapsulated
* contentSz - size of content, octets
* unprotectedAttribs - optional unprotected attributes, for EncryptedData
* unprotectedAttribsSz - number of PKCS7Attrib members in unprotectedAttribs
* signedAttribs - optional signed attributes, for SignedData
* signedAttribsSz - number of PKCS7Attrib members in signedAttribs
* output - output buffer for final bundle
* outputSz - size of output buffer, octets
*
* Returns length of generated bundle on success, negative upon error. */
int wc_PKCS7_EncodeSignedEncryptedCompressedFPD(PKCS7* pkcs7, byte* encryptKey,
word32 encryptKeySz, byte* privateKey,
word32 privateKeySz, int encryptOID,
int signOID, int hashOID, byte* content,
word32 contentSz,
PKCS7Attrib* unprotectedAttribs,
word32 unprotectedAttribsSz,
PKCS7Attrib* signedAttribs,
word32 signedAttribsSz,
byte* output, word32 outputSz)
{
int ret = 0, compressedSz = 0, encryptedSz = 0;
byte* compressed = NULL;
byte* encrypted = NULL;
WC_RNG rng;
if (pkcs7 == NULL || encryptKey == NULL || encryptKeySz == 0 ||
privateKey == NULL || privateKeySz == 0 || content == NULL ||
contentSz == 0 || output == NULL || outputSz == 0) {
return BAD_FUNC_ARG;
}
/* 1: build up CompressedData using FirmwarePkgData type, use output
* buffer as tmp for storage and to get size */
pkcs7->content = content;
pkcs7->contentSz = contentSz;
pkcs7->contentOID = FIRMWARE_PKG_DATA;
compressedSz = wc_PKCS7_EncodeCompressedData(pkcs7, output, outputSz);
if (compressedSz < 0) {
WOLFSSL_MSG("Error encoding CMS CompressedData content type");
return compressedSz;
}
/* save compressedData, reset output buffer and struct */
compressed = (byte*)XMALLOC(compressedSz, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (compressed == NULL)
return MEMORY_E;
XMEMCPY(compressed, output, compressedSz);
ForceZero(output, outputSz);
/* 2: build up EncryptedData using CompressedData, use output
* buffer as tmp for storage and to get size */
pkcs7->content = compressed;
pkcs7->contentSz = compressedSz;
pkcs7->contentOID = COMPRESSED_DATA;
pkcs7->encryptOID = encryptOID;
pkcs7->encryptionKey = encryptKey;
pkcs7->encryptionKeySz = encryptKeySz;
pkcs7->unprotectedAttribs = unprotectedAttribs;
pkcs7->unprotectedAttribsSz = unprotectedAttribsSz;
encryptedSz = wc_PKCS7_EncodeEncryptedData(pkcs7, output, outputSz);
if (encryptedSz < 0) {
WOLFSSL_MSG("Error encoding CMS EncryptedData content type");
XFREE(compressed, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return encryptedSz;
}
/* save encryptedData, reset output buffer and struct */
encrypted = (byte*)XMALLOC(encryptedSz, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (encrypted == NULL) {
ForceZero(compressed, compressedSz);
XFREE(compressed, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return MEMORY_E;
}
XMEMCPY(encrypted, output, encryptedSz);
ForceZero(compressed, compressedSz);
XFREE(compressed, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
ForceZero(output, outputSz);
ret = wc_InitRng(&rng);
if (ret != 0) {
ForceZero(encrypted, encryptedSz);
XFREE(encrypted, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
/* 3: build up SignedData, encapsulating EncryptedData */
pkcs7->rng = &rng;
pkcs7->content = encrypted;
pkcs7->contentSz = encryptedSz;
pkcs7->contentOID = ENCRYPTED_DATA;
pkcs7->hashOID = hashOID;
pkcs7->encryptOID = signOID;
pkcs7->privateKey = privateKey;
pkcs7->privateKeySz = privateKeySz;
pkcs7->signedAttribs = signedAttribs;
pkcs7->signedAttribsSz = signedAttribsSz;
ret = wc_PKCS7_EncodeSignedData(pkcs7, output, outputSz);
if (ret <= 0) {
WOLFSSL_MSG("Error encoding CMS SignedData content type");
ForceZero(encrypted, encryptedSz);
XFREE(encrypted, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
wc_FreeRng(&rng);
return ret;
}
ForceZero(encrypted, encryptedSz);
XFREE(encrypted, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
wc_FreeRng(&rng);
return ret;
}
#endif /* !NO_PKCS7_ENCRYPTED_DATA */
#endif /* HAVE_LIBZ && !NO_PKCS7_COMPRESSED_DATA */
#ifndef NO_RSA
/* returns size of signature put into out, negative on error */
static int wc_PKCS7_RsaVerify(PKCS7* pkcs7, byte* sig, int sigSz,
byte* hash, word32 hashSz)
{
int ret = 0, i;
word32 scratch = 0, verified = 0;
#ifdef WOLFSSL_SMALL_STACK
byte* digest;
RsaKey* key;
DecodedCert* dCert;
#else
byte digest[MAX_PKCS7_DIGEST_SZ];
RsaKey key[1];
DecodedCert stack_dCert;
DecodedCert* dCert = &stack_dCert;
#endif
if (pkcs7 == NULL || sig == NULL || hash == NULL) {
return BAD_FUNC_ARG;
}
#ifdef WOLFSSL_SMALL_STACK
digest = (byte*)XMALLOC(MAX_PKCS7_DIGEST_SZ, pkcs7->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (digest == NULL)
return MEMORY_E;
key = (RsaKey*)XMALLOC(sizeof(RsaKey), pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
if (key == NULL) {
XFREE(digest, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
return MEMORY_E;
}
dCert = (DecodedCert*)XMALLOC(sizeof(DecodedCert), pkcs7->heap,
DYNAMIC_TYPE_DCERT);
if (dCert == NULL) {
XFREE(digest, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(key, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
return MEMORY_E;
}
#endif
XMEMSET(digest, 0, MAX_PKCS7_DIGEST_SZ);
/* loop over certs received in certificates set, try to find one
* that will validate signature */
for (i = 0; i < MAX_PKCS7_CERTS; i++) {
verified = 0;
scratch = 0;
if (pkcs7->certSz[i] == 0)
continue;
ret = wc_InitRsaKey_ex(key, pkcs7->heap, pkcs7->devId);
if (ret != 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(digest, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(key, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(dCert, pkcs7->heap, DYNAMIC_TYPE_DCERT);
#endif
return ret;
}
InitDecodedCert(dCert, pkcs7->cert[i], pkcs7->certSz[i], pkcs7->heap);
/* not verifying, only using this to extract public key */
ret = ParseCert(dCert, CA_TYPE, NO_VERIFY, 0);
if (ret < 0) {
WOLFSSL_MSG("ASN RSA cert parse error");
FreeDecodedCert(dCert);
wc_FreeRsaKey(key);
continue;
}
if (wc_RsaPublicKeyDecode(dCert->publicKey, &scratch, key,
dCert->pubKeySize) < 0) {
WOLFSSL_MSG("ASN RSA key decode error");
FreeDecodedCert(dCert);
wc_FreeRsaKey(key);
continue;
}
#ifdef WOLFSSL_ASYNC_CRYPT
do {
ret = wc_AsyncWait(ret, &key->asyncDev,
WC_ASYNC_FLAG_CALL_AGAIN);
#endif
if (ret >= 0) {
ret = wc_RsaSSL_Verify(sig, sigSz, digest, MAX_PKCS7_DIGEST_SZ,
key);
}
#ifdef WOLFSSL_ASYNC_CRYPT
} while (ret == WC_PENDING_E);
#endif
FreeDecodedCert(dCert);
wc_FreeRsaKey(key);
if ((ret > 0) && (hashSz == (word32)ret)) {
if (XMEMCMP(digest, hash, hashSz) == 0) {
/* found signer that successfully verified signature */
verified = 1;
break;
}
}
}
if (verified == 0) {
ret = SIG_VERIFY_E;
}
#ifdef WOLFSSL_SMALL_STACK
XFREE(digest, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(key, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(dCert, pkcs7->heap, DYNAMIC_TYPE_DCERT);
#endif
return ret;
}
#endif /* NO_RSA */
#ifdef HAVE_ECC
/* returns size of signature put into out, negative on error */
static int wc_PKCS7_EcdsaVerify(PKCS7* pkcs7, byte* sig, int sigSz,
byte* hash, word32 hashSz)
{
int ret = 0, i;
int res = 0;
int verified = 0;
#ifdef WOLFSSL_SMALL_STACK
byte* digest;
ecc_key* key;
DecodedCert* dCert;
#else
byte digest[MAX_PKCS7_DIGEST_SZ];
ecc_key key[1];
DecodedCert stack_dCert;
DecodedCert* dCert = &stack_dCert;
#endif
word32 idx = 0;
if (pkcs7 == NULL || sig == NULL)
return BAD_FUNC_ARG;
#ifdef WOLFSSL_SMALL_STACK
digest = (byte*)XMALLOC(MAX_PKCS7_DIGEST_SZ, pkcs7->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (digest == NULL)
return MEMORY_E;
key = (ecc_key*)XMALLOC(sizeof(ecc_key), pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
if (key == NULL) {
XFREE(digest, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
return MEMORY_E;
}
dCert = (DecodedCert*)XMALLOC(sizeof(DecodedCert), pkcs7->heap,
DYNAMIC_TYPE_DCERT);
if (dCert == NULL) {
XFREE(digest, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(key, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
return MEMORY_E;
}
#endif
XMEMSET(digest, 0, MAX_PKCS7_DIGEST_SZ);
/* loop over certs received in certificates set, try to find one
* that will validate signature */
for (i = 0; i < MAX_PKCS7_CERTS; i++) {
verified = 0;
if (pkcs7->certSz[i] == 0)
continue;
ret = wc_ecc_init_ex(key, pkcs7->heap, pkcs7->devId);
if (ret != 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(digest, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(key, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(dCert, pkcs7->heap, DYNAMIC_TYPE_DCERT);
#endif
return ret;
}
InitDecodedCert(dCert, pkcs7->cert[i], pkcs7->certSz[i], pkcs7->heap);
/* not verifying, only using this to extract public key */
ret = ParseCert(dCert, CA_TYPE, NO_VERIFY, 0);
if (ret < 0) {
WOLFSSL_MSG("ASN ECC cert parse error");
FreeDecodedCert(dCert);
wc_ecc_free(key);
continue;
}
if (wc_EccPublicKeyDecode(pkcs7->publicKey, &idx, key,
pkcs7->publicKeySz) < 0) {
WOLFSSL_MSG("ASN ECC key decode error");
FreeDecodedCert(dCert);
wc_ecc_free(key);
continue;
}
#ifdef WOLFSSL_ASYNC_CRYPT
do {
ret = wc_AsyncWait(ret, &key->asyncDev,
WC_ASYNC_FLAG_CALL_AGAIN);
#endif
if (ret >= 0) {
ret = wc_ecc_verify_hash(sig, sigSz, hash, hashSz, &res, key);
}
#ifdef WOLFSSL_ASYNC_CRYPT
} while (ret == WC_PENDING_E);
#endif
FreeDecodedCert(dCert);
wc_ecc_free(key);
if (ret == 0 && res == 1) {
/* found signer that successfully verified signature */
verified = 1;
break;
}
}
if (verified == 0) {
ret = SIG_VERIFY_E;
}
#ifdef WOLFSSL_SMALL_STACK
XFREE(digest, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(key, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(dCert, pkcs7->heap, DYNAMIC_TYPE_DCERT);
#endif
return ret;
}
#endif /* HAVE_ECC */
/* build SignedData digest, both in PKCS#7 DigestInfo format and
* as plain digest for CMS.
*
* pkcs7 - pointer to initialized PKCS7 struct
* signedAttrib - signed attributes
* signedAttribSz - size of signedAttrib, octets
* pkcs7Digest - [OUT] PKCS#7 DigestInfo
* pkcs7DigestSz - [IN/OUT] size of pkcs7Digest
* plainDigest - [OUT] pointer to plain digest, offset into pkcs7Digest
* plainDigestSz - [OUT] size of digest at plainDigest
*
* returns 0 on success, negative on error */
static int wc_PKCS7_BuildSignedDataDigest(PKCS7* pkcs7, byte* signedAttrib,
word32 signedAttribSz, byte* pkcs7Digest,
word32* pkcs7DigestSz, byte** plainDigest,
word32* plainDigestSz,
const byte* hashBuf, word32 hashBufSz)
{
int ret = 0, digIdx = 0;
word32 attribSetSz = 0, hashSz = 0;
byte attribSet[MAX_SET_SZ];
byte digest[WC_MAX_DIGEST_SIZE];
byte digestInfoSeq[MAX_SEQ_SZ];
byte digestStr[MAX_OCTET_STR_SZ];
byte algoId[MAX_ALGO_SZ];
word32 digestInfoSeqSz, digestStrSz, algoIdSz;
#ifdef WOLFSSL_SMALL_STACK
byte* digestInfo;
#else
byte digestInfo[MAX_PKCS7_DIGEST_SZ];
#endif
wc_HashAlg hash;
enum wc_HashType hashType;
/* check arguments */
if (pkcs7 == NULL || pkcs7Digest == NULL ||
pkcs7DigestSz == NULL || plainDigest == NULL) {
return BAD_FUNC_ARG;
}
hashType = wc_OidGetHash(pkcs7->hashOID);
ret = wc_HashGetDigestSize(hashType);
if (ret < 0)
return ret;
hashSz = ret;
if (signedAttribSz > 0) {
if (signedAttrib == NULL)
return BAD_FUNC_ARG;
}
else {
if (hashBuf && hashBufSz > 0) {
if (hashSz != hashBufSz)
return BAD_FUNC_ARG;
}
else if (pkcs7->content == NULL)
return BAD_FUNC_ARG;
}
#ifdef WOLFSSL_SMALL_STACK
digestInfo = (byte*)XMALLOC(MAX_PKCS7_DIGEST_SZ, pkcs7->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (digestInfo == NULL)
return MEMORY_E;
#endif
XMEMSET(pkcs7Digest, 0, *pkcs7DigestSz);
XMEMSET(digest, 0, WC_MAX_DIGEST_SIZE);
XMEMSET(digestInfo, 0, MAX_PKCS7_DIGEST_SZ);
/* calculate digest */
if (hashBuf && hashBufSz > 0 && signedAttribSz == 0) {
XMEMCPY(digest, hashBuf, hashBufSz);
}
else {
ret = wc_HashInit(&hash, hashType);
if (ret < 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(digestInfo, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ret;
}
if (signedAttribSz > 0) {
attribSetSz = SetSet(signedAttribSz, attribSet);
/* calculate digest */
ret = wc_HashUpdate(&hash, hashType, attribSet, attribSetSz);
if (ret == 0)
ret = wc_HashUpdate(&hash, hashType, signedAttrib, signedAttribSz);
if (ret == 0)
ret = wc_HashFinal(&hash, hashType, digest);
} else {
ret = wc_HashUpdate(&hash, hashType, pkcs7->content, pkcs7->contentSz);
if (ret == 0)
ret = wc_HashFinal(&hash, hashType, digest);
}
wc_HashFree(&hash, hashType);
if (ret < 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(digestInfo, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ret;
}
}
/* Set algoID, with NULL attributes */
algoIdSz = SetAlgoID(pkcs7->hashOID, algoId, oidHashType, 0);
digestStrSz = SetOctetString(hashSz, digestStr);
digestInfoSeqSz = SetSequence(algoIdSz + digestStrSz + hashSz,
digestInfoSeq);
XMEMCPY(digestInfo + digIdx, digestInfoSeq, digestInfoSeqSz);
digIdx += digestInfoSeqSz;
XMEMCPY(digestInfo + digIdx, algoId, algoIdSz);
digIdx += algoIdSz;
XMEMCPY(digestInfo + digIdx, digestStr, digestStrSz);
digIdx += digestStrSz;
XMEMCPY(digestInfo + digIdx, digest, hashSz);
digIdx += hashSz;
XMEMCPY(pkcs7Digest, digestInfo, digIdx);
*pkcs7DigestSz = digIdx;
/* set plain digest pointer */
*plainDigest = pkcs7Digest + digIdx - hashSz;
*plainDigestSz = hashSz;
#ifdef WOLFSSL_SMALL_STACK
XFREE(digestInfo, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return 0;
}
/* verifies SignedData signature, over either PKCS#7 DigestInfo or
* content digest.
*
* pkcs7 - pointer to initialized PKCS7 struct
* sig - signature to verify
* sigSz - size of sig
* signedAttrib - signed attributes, or null if empty
* signedAttribSz - size of signedAttributes
*
* return 0 on success, negative on error */
static int wc_PKCS7_SignedDataVerifySignature(PKCS7* pkcs7, byte* sig,
word32 sigSz, byte* signedAttrib,
word32 signedAttribSz,
const byte* hashBuf, word32 hashSz)
{
int ret = 0;
word32 plainDigestSz = 0, pkcs7DigestSz;
byte* plainDigest = NULL; /* offset into pkcs7Digest */
#ifdef WOLFSSL_SMALL_STACK
byte* pkcs7Digest;
#else
byte pkcs7Digest[MAX_PKCS7_DIGEST_SZ];
#endif
if (pkcs7 == NULL)
return BAD_FUNC_ARG;
/* build hash to verify against */
pkcs7DigestSz = MAX_PKCS7_DIGEST_SZ;
#ifdef WOLFSSL_SMALL_STACK
pkcs7Digest = (byte*)XMALLOC(pkcs7DigestSz, pkcs7->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (pkcs7Digest == NULL)
return MEMORY_E;
#endif
XMEMSET(pkcs7Digest, 0, pkcs7DigestSz);
ret = wc_PKCS7_BuildSignedDataDigest(pkcs7, signedAttrib,
signedAttribSz, pkcs7Digest,
&pkcs7DigestSz, &plainDigest,
&plainDigestSz, hashBuf, hashSz);
if (ret < 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(pkcs7Digest, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ret;
}
switch (pkcs7->publicKeyOID) {
#ifndef NO_RSA
case RSAk:
ret = wc_PKCS7_RsaVerify(pkcs7, sig, sigSz, pkcs7Digest,
pkcs7DigestSz);
if (ret < 0) {
WOLFSSL_MSG("PKCS#7 verification failed, trying CMS");
ret = wc_PKCS7_RsaVerify(pkcs7, sig, sigSz, plainDigest,
plainDigestSz);
}
break;
#endif
#ifdef HAVE_ECC
case ECDSAk:
ret = wc_PKCS7_EcdsaVerify(pkcs7, sig, sigSz, plainDigest,
plainDigestSz);
break;
#endif
default:
WOLFSSL_MSG("Unsupported public key type");
ret = BAD_FUNC_ARG;
}
#ifdef WOLFSSL_SMALL_STACK
XFREE(pkcs7Digest, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ret;
}
/* set correct public key OID based on signature OID, stores in
* pkcs7->publicKeyOID and returns same value */
static int wc_PKCS7_SetPublicKeyOID(PKCS7* pkcs7, int sigOID)
{
if (pkcs7 == NULL)
return BAD_FUNC_ARG;
pkcs7->publicKeyOID = 0;
switch (sigOID) {
#ifndef NO_RSA
/* RSA signature types */
case CTC_MD2wRSA:
case CTC_MD5wRSA:
case CTC_SHAwRSA:
case CTC_SHA224wRSA:
case CTC_SHA256wRSA:
case CTC_SHA384wRSA:
case CTC_SHA512wRSA:
pkcs7->publicKeyOID = RSAk;
break;
/* if sigOID is already RSAk */
case RSAk:
pkcs7->publicKeyOID = sigOID;
break;
#endif
#ifndef NO_DSA
/* DSA signature types */
case CTC_SHAwDSA:
pkcs7->publicKeyOID = DSAk;
break;
/* if sigOID is already DSAk */
case DSAk:
pkcs7->publicKeyOID = sigOID;
break;
#endif
#ifdef HAVE_ECC
/* ECDSA signature types */
case CTC_SHAwECDSA:
case CTC_SHA224wECDSA:
case CTC_SHA256wECDSA:
case CTC_SHA384wECDSA:
case CTC_SHA512wECDSA:
pkcs7->publicKeyOID = ECDSAk;
break;
/* if sigOID is already ECDSAk */
case ECDSAk:
pkcs7->publicKeyOID = sigOID;
break;
#endif
default:
WOLFSSL_MSG("Unsupported public key algorithm");
return ASN_SIG_KEY_E;
}
return pkcs7->publicKeyOID;
}
/* Parses through the attributes and adds them to the PKCS7 structure
* Creates dynamic attribute structures that are free'd with calling
* wc_PKCS7_Free()
*
* NOTE: An attribute has the ASN1 format of
** Sequence
****** Object ID
****** Set
********** {PritnableString, UTCTime, OCTET STRING ...}
*
* pkcs7 the PKCS7 structure to put the parsed attributes into
* in buffer holding all attributes
* inSz size of in buffer
*
* returns the number of attributes parsed on success
*/
static int wc_PKCS7_ParseAttribs(PKCS7* pkcs7, byte* in, int inSz)
{
int found = 0;
word32 idx = 0;
word32 oid;
if (pkcs7 == NULL || in == NULL || inSz < 0) {
return BAD_FUNC_ARG;
}
while (idx < (word32)inSz) {
int length = 0;
int oidIdx;
PKCS7DecodedAttrib* attrib;
if (GetSequence(in, &idx, &length, inSz) < 0)
return ASN_PARSE_E;
attrib = (PKCS7DecodedAttrib*)XMALLOC(sizeof(PKCS7DecodedAttrib),
pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (attrib == NULL) {
return MEMORY_E;
}
XMEMSET(attrib, 0, sizeof(PKCS7DecodedAttrib));
oidIdx = idx;
if (GetObjectId(in, &idx, &oid, oidIgnoreType, inSz)
< 0) {
XFREE(attrib, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ASN_PARSE_E;
}
attrib->oidSz = idx - oidIdx;
attrib->oid = (byte*)XMALLOC(attrib->oidSz, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (attrib->oid == NULL) {
XFREE(attrib, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return MEMORY_E;
}
XMEMCPY(attrib->oid, in + oidIdx, attrib->oidSz);
/* Get Set that contains the printable string value */
if (GetSet(in, &idx, &length, inSz) < 0) {
XFREE(attrib->oid, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(attrib, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ASN_PARSE_E;
}
if ((inSz - idx) < (word32)length) {
XFREE(attrib->oid, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(attrib, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ASN_PARSE_E;
}
attrib->valueSz = (word32)length;
attrib->value = (byte*)XMALLOC(attrib->valueSz, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (attrib->value == NULL) {
XFREE(attrib->oid, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(attrib, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return MEMORY_E;
}
XMEMCPY(attrib->value, in + idx, attrib->valueSz);
idx += length;
/* store attribute in linked list */
if (pkcs7->decodedAttrib != NULL) {
attrib->next = pkcs7->decodedAttrib;
pkcs7->decodedAttrib = attrib;
} else {
pkcs7->decodedAttrib = attrib;
}
found++;
}
return found;
}
/* option to turn off support for degenerate cases
* flag 0 turns off support
* flag 1 turns on support
*
* by default support for SignedData degenerate cases is on
*/
void wc_PKCS7_AllowDegenerate(PKCS7* pkcs7, word16 flag)
{
if (pkcs7) {
if (flag) { /* flag of 1 turns on support for degenerate */
pkcs7->noDegenerate = 0;
}
else { /* flag of 0 turns off support */
pkcs7->noDegenerate = 1;
}
}
}
/* Finds the certificates in the message and saves it. By default allows
* degenerate cases which can have no signer.
*
* By default expects type SIGNED_DATA (SignedData) which can have any number of
* elements in signerInfos collection, including zero. (RFC2315 section 9.1)
* When adding support for the case of SignedAndEnvelopedData content types a
* signer is required. In this case the PKCS7 flag noDegenerate could be set.
*/
static int PKCS7_VerifySignedData(PKCS7* pkcs7, const byte* hashBuf,
word32 hashSz, byte* in, word32 inSz,
byte* in2, word32 in2Sz)
{
word32 idx, outerContentType, hashOID = 0, sigOID, contentTypeSz = 0, totalSz = 0;
int length = 0, version, ret = 0;
byte* content = NULL;
byte* contentDynamic = NULL;
byte* sig = NULL;
byte* cert = NULL;
byte* signedAttrib = NULL;
byte* contentType = NULL;
int contentSz = 0, sigSz = 0, certSz = 0, signedAttribSz = 0;
word32 localIdx, start;
byte degenerate = 0;
byte detached = 0;
#ifdef ASN_BER_TO_DER
byte* der;
#endif
int multiPart = 0, keepContent;
int contentLen;
byte* pkiMsg = in;
word32 pkiMsgSz = inSz;
#ifndef NO_PKCS7_STREAM
word32 stateIdx = 0;
long rc;
#endif
byte* pkiMsg2 = in2;
word32 pkiMsg2Sz = in2Sz;
if (pkcs7 == NULL)
return BAD_FUNC_ARG;
#ifndef NO_PKCS7_STREAM
/* allow for 0 size inputs with stream mode */
if (pkcs7 == NULL || (pkiMsg == NULL && pkiMsgSz > 0))
return BAD_FUNC_ARG;
#else
if (pkiMsg == NULL || pkiMsgSz == 0)
return BAD_FUNC_ARG;
#endif
if ((hashSz > 0 && hashBuf == NULL) || (pkiMsg2Sz > 0 && pkiMsg2 == NULL)) {
return BAD_FUNC_ARG;
}
idx = 0;
#ifdef ASN_BER_TO_DER
if (pkcs7->derSz > 0 && pkcs7->der) {
pkiMsg = in = pkcs7->der;
}
#endif
#ifndef NO_PKCS7_STREAM
if (pkcs7->stream == NULL) {
if ((ret = wc_PKCS7_CreateStream(pkcs7)) != 0) {
return ret;
}
}
#endif
switch (pkcs7->state) {
case WC_PKCS7_START:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz, MAX_SEQ_SZ +
MAX_VERSION_SZ + MAX_SEQ_SZ + MAX_LENGTH_SZ +
ASN_TAG_SZ + MAX_OID_SZ + MAX_SEQ_SZ,
&pkiMsg, &idx)) != 0) {
break;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_SEQ_PEEK, in, inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (pkcs7->stream->length > 0)? pkcs7->stream->length :inSz;
#endif
/* determine total message size */
totalSz = pkiMsgSz;
if (pkiMsg2 && pkiMsg2Sz > 0) {
totalSz += pkiMsg2Sz + pkcs7->contentSz;
}
/* Get the contentInfo sequence */
if (ret == 0 && GetSequence_ex(pkiMsg, &idx, &length, totalSz,
NO_USER_CHECK) < 0)
ret = ASN_PARSE_E;
if (ret == 0 && length == 0 && pkiMsg[idx-1] == 0x80) {
#ifdef ASN_BER_TO_DER
word32 len = 0;
ret = wc_BerToDer(pkiMsg, pkiMsgSz, NULL, &len);
if (ret != LENGTH_ONLY_E)
return ret;
pkcs7->der = (byte*)XMALLOC(len, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (pkcs7->der == NULL)
return MEMORY_E;
ret = wc_BerToDer(pkiMsg, pkiMsgSz, pkcs7->der, &len);
if (ret < 0)
return ret;
pkiMsg = in = pkcs7->der;
pkiMsgSz = pkcs7->derSz = len;
idx = 0;
if (GetSequence_ex(pkiMsg, &idx, &length, pkiMsgSz,
NO_USER_CHECK) < 0)
return ASN_PARSE_E;
#ifndef NO_PKCS7_STREAM
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_SEQ_PEEK,
pkiMsg, pkiMsgSz);
if (rc < 0) {
ret = (int)rc;
break;
}
#endif
#else
ret = BER_INDEF_E;
#endif
}
/* Get the contentInfo contentType */
if (ret == 0 && wc_GetContentType(pkiMsg, &idx, &outerContentType,
pkiMsgSz) < 0)
ret = ASN_PARSE_E;
if (ret == 0 && outerContentType != SIGNED_DATA) {
WOLFSSL_MSG("PKCS#7 input not of type SignedData");
ret = PKCS7_OID_E;
}
/* get the ContentInfo content */
if (ret == 0 && pkiMsg[idx++] !=
(ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC | 0))
ret = ASN_PARSE_E;
if (ret == 0 && GetLength_ex(pkiMsg, &idx, &length, totalSz,
NO_USER_CHECK) < 0)
ret = ASN_PARSE_E;
/* Get the signedData sequence */
if (ret == 0 && GetSequence_ex(pkiMsg, &idx, &length, totalSz,
NO_USER_CHECK) < 0)
ret = ASN_PARSE_E;
/* Get the version */
if (ret == 0 && GetMyVersion(pkiMsg, &idx, &version, pkiMsgSz) < 0)
ret = ASN_PARSE_E;
if (ret == 0 && version != 1) {
WOLFSSL_MSG("PKCS#7 signedData needs to be of version 1");
ret = ASN_VERSION_E;
}
/* Get the set of DigestAlgorithmIdentifiers */
if (ret == 0 && GetSet(pkiMsg, &idx, &length, pkiMsgSz) < 0)
ret = ASN_PARSE_E;
/* Skip the set. */
idx += length;
degenerate = (length == 0)? 1 : 0;
if (pkcs7->noDegenerate == 1 && degenerate == 1) {
ret = PKCS7_NO_SIGNER_E;
}
if (ret != 0)
break;
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &stateIdx, &idx)) != 0) {
break;
}
if (pkiMsg2 && pkiMsg2Sz > 0) {
pkcs7->stream->maxLen += pkiMsg2Sz + pkcs7->contentSz;
}
wc_PKCS7_StreamStoreVar(pkcs7, totalSz, 0, 0);
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_VERIFY_STAGE2);
FALL_THROUGH;
case WC_PKCS7_VERIFY_STAGE2:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz + in2Sz,
MAX_SEQ_SZ + MAX_OID_SZ + ASN_TAG_SZ + MAX_LENGTH_SZ
+ ASN_TAG_SZ + MAX_LENGTH_SZ, &pkiMsg, &idx)) != 0) {
break;
}
wc_PKCS7_StreamGetVar(pkcs7, &totalSz, 0, 0);
if (pkcs7->stream->length > 0)
pkiMsgSz = pkcs7->stream->length;
#ifdef ASN_BER_TO_DER
else if (pkcs7->der)
pkiMsgSz = pkcs7->derSz;
#endif
else
pkiMsgSz = inSz;
#endif
/* Get the inner ContentInfo sequence */
if (GetSequence_ex(pkiMsg, &idx, &length, pkiMsgSz,
NO_USER_CHECK) < 0)
ret = ASN_PARSE_E;
/* Get the inner ContentInfo contentType */
if (ret == 0) {
word32 tmpIdx = idx;
if (GetASNObjectId(pkiMsg, &idx, &length, pkiMsgSz) != 0)
ret = ASN_PARSE_E;
contentType = pkiMsg + tmpIdx;
contentTypeSz = length + (idx - tmpIdx);
idx += length;
}
if (ret != 0)
break;
/* Check for content info, it could be omitted when degenerate */
localIdx = idx;
ret = 0;
if (pkiMsg[localIdx++] != (ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC | 0))
ret = ASN_PARSE_E;
if (ret == 0 && GetLength_ex(pkiMsg, &localIdx, &length, pkiMsgSz,
NO_USER_CHECK) <= 0)
ret = ASN_PARSE_E;
/* get length of content in the case that there is multiple parts */
if (ret == 0 && pkiMsg[localIdx] == (ASN_OCTET_STRING | ASN_CONSTRUCTED)) {
multiPart = 1;
localIdx++;
/* Get length of all OCTET_STRINGs. */
if (GetLength_ex(pkiMsg, &localIdx, &contentLen, pkiMsgSz,
NO_USER_CHECK) < 0)
ret = ASN_PARSE_E;
/* Check whether there is one OCTET_STRING inside. */
start = localIdx;
if (ret == 0 && pkiMsg[localIdx++] != ASN_OCTET_STRING)
ret = ASN_PARSE_E;
if (ret == 0 && GetLength_ex(pkiMsg, &localIdx, &length, pkiMsgSz,
NO_USER_CHECK) < 0)
ret = ASN_PARSE_E;
if (ret == 0) {
/* Use single OCTET_STRING directly. */
if (localIdx - start + length == (word32)contentLen)
multiPart = 0;
localIdx = start;
}
}
/* get length of content in case of single part */
if (ret == 0 && !multiPart) {
if (pkiMsg[localIdx++] != ASN_OCTET_STRING)
ret = ASN_PARSE_E;
if (ret == 0 && GetLength_ex(pkiMsg, &localIdx,
&length, pkiMsgSz, NO_USER_CHECK) < 0)
ret = ASN_PARSE_E;
}
/* update idx if successful */
if (ret == 0) {
/* support using header and footer without content */
if (pkiMsg2 && pkiMsg2Sz > 0 && hashBuf && hashSz > 0) {
localIdx = 0;
}
idx = localIdx;
}
else {
/* if pkcs7->content and pkcs7->contentSz are set, try to
process as a detached signature */
if (!degenerate &&
(pkcs7->content != NULL && pkcs7->contentSz != 0)) {
detached = 1;
}
if (!degenerate && !detached && ret != 0)
break;
length = 0; /* no content to read */
pkiMsg2 = pkiMsg;
pkiMsg2Sz = pkiMsgSz;
}
#ifndef NO_PKCS7_STREAM
/* save detached flag value */
pkcs7->stream->detached = detached;
/* save contentType */
pkcs7->stream->nonce = (byte*)XMALLOC(contentTypeSz, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (pkcs7->stream->nonce == NULL) {
ret = MEMORY_E;
break;
}
else {
pkcs7->stream->nonceSz = contentTypeSz;
XMEMCPY(pkcs7->stream->nonce, contentType, contentTypeSz);
}
/* content expected? */
if ((ret == 0 && length > 0) &&
!(pkiMsg2 && pkiMsg2Sz > 0 && hashBuf && hashSz > 0)) {
pkcs7->stream->expected = length + ASN_TAG_SZ;
}
else {
pkcs7->stream->expected = ASN_TAG_SZ;
}
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &stateIdx, &idx)) != 0) {
break;
}
wc_PKCS7_StreamStoreVar(pkcs7, pkiMsg2Sz, localIdx, length);
/* content length is in multiple parts */
if (multiPart) {
pkcs7->stream->expected = contentLen + ASN_TAG_SZ;
}
pkcs7->stream->multi = multiPart;
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_VERIFY_STAGE3);
FALL_THROUGH;
case WC_PKCS7_VERIFY_STAGE3:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz + in2Sz,
pkcs7->stream->expected, &pkiMsg, &idx)) != 0) {
break;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK,
pkiMsg, pkiMsgSz);
if (rc < 0) {
ret = (int)rc;
break;
}
#ifdef ASN_BER_TO_DER
if (pkcs7->derSz != 0)
pkiMsgSz = pkcs7->derSz;
else
#endif
pkiMsgSz = (word32)rc;
wc_PKCS7_StreamGetVar(pkcs7, &pkiMsg2Sz, (int*)&localIdx, &length);
if (pkcs7->stream->length > 0) {
localIdx = 0;
}
multiPart = pkcs7->stream->multi;
detached = pkcs7->stream->detached;
#endif
/* Break out before content because it can be optional in degenerate
* cases. */
if (ret != 0 && !degenerate)
break;
/* get parts of content */
if (ret == 0 && multiPart) {
int i = 0;
keepContent = !(pkiMsg2 && pkiMsg2Sz > 0 && hashBuf && hashSz > 0);
if (keepContent) {
/* Create a buffer to hold content of OCTET_STRINGs. */
pkcs7->contentDynamic = (byte*)XMALLOC(contentLen, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (pkcs7->contentDynamic == NULL)
ret = MEMORY_E;
}
start = localIdx;
/* Use the data from each OCTET_STRING. */
while (ret == 0 && localIdx < start + contentLen) {
if (pkiMsg[localIdx++] != ASN_OCTET_STRING)
ret = ASN_PARSE_E;
if (ret == 0 && GetLength(pkiMsg, &localIdx, &length, totalSz) < 0)
ret = ASN_PARSE_E;
if (ret == 0 && length + localIdx > start + contentLen)
ret = ASN_PARSE_E;
if (ret == 0) {
if (keepContent) {
XMEMCPY(pkcs7->contentDynamic + i, pkiMsg + localIdx,
length);
}
i += length;
localIdx += length;
}
}
localIdx = start; /* reset for sanity check, increment later */
length = i;
}
/* Save the inner data as the content. */
if (ret == 0 && length > 0) {
contentSz = length;
/* support using header and footer without content */
if (pkiMsg2 && pkiMsg2Sz > 0 && hashBuf && hashSz > 0) {
/* Content not provided, use provided pkiMsg2 footer */
content = NULL;
localIdx = 0;
if (contentSz != (int)pkcs7->contentSz) {
WOLFSSL_MSG("Data signed does not match contentSz provided");
ret = BUFFER_E;
}
}
else {
if ((word32)length > pkiMsgSz - localIdx) {
ret = BUFFER_E;
}
/* Content pointer for calculating hashes later */
if (ret == 0 && !multiPart) {
content = &pkiMsg[localIdx];
}
if (ret == 0 && multiPart) {
content = pkcs7->contentDynamic;
}
if (ret == 0) {
idx += length;
pkiMsg2 = pkiMsg;
pkiMsg2Sz = pkiMsgSz;
#ifndef NO_PKCS7_STREAM
pkcs7->stream->flagOne = 1;
#endif
}
}
}
else {
pkiMsg2 = pkiMsg;
pkiMsg2Sz = pkiMsgSz;
#ifndef NO_PKCS7_STREAM
pkcs7->stream->flagOne = 1;
#endif
}
/* If getting the content info failed with non degenerate then return the
* error case. Otherwise with a degenerate it is ok if the content
* info was omitted */
if (!degenerate && !detached && ret != 0) {
break;
}
else {
ret = 0; /* reset ret state on degenerate case */
}
/* Get the implicit[0] set of certificates */
if (ret == 0 && idx >= pkiMsg2Sz)
ret = BUFFER_E;
if (ret == 0 && pkiMsg2[idx] ==
(ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC | 0)) {
idx++;
if (GetLength(pkiMsg2, &idx, &length, pkiMsg2Sz) < 0)
ret = ASN_PARSE_E;
if (ret != 0) {
break;
}
#ifndef NO_PKCS7_STREAM
/* save content */
if (detached == 1) {
/* if detached, use content from user in pkcs7 struct */
content = pkcs7->content;
contentSz = pkcs7->contentSz;
}
if (content != NULL) {
XFREE(pkcs7->stream->content, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
pkcs7->stream->content = (byte*)XMALLOC(contentSz, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (pkcs7->stream->content == NULL) {
ret = MEMORY_E;
break;
}
else {
XMEMCPY(pkcs7->stream->content, content, contentSz);
pkcs7->stream->contentSz = contentSz;
}
}
if (content != NULL && pkcs7->stream->flagOne) {
stateIdx = idx; /* case where all data was read from in2 */
}
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &stateIdx, &idx)) != 0) {
break;
}
wc_PKCS7_StreamStoreVar(pkcs7, pkiMsg2Sz, 0, length);
if (length > 0) {
pkcs7->stream->expected = length;
}
else {
pkcs7->stream->expected = MAX_SEQ_SZ;
}
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_VERIFY_STAGE4);
FALL_THROUGH;
case WC_PKCS7_VERIFY_STAGE4:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz + in2Sz,
pkcs7->stream->expected, &pkiMsg, &idx)) != 0) {
break;
}
wc_PKCS7_StreamGetVar(pkcs7, &pkiMsg2Sz, 0, &length);
if (pkcs7->stream->flagOne) {
pkiMsg2 = pkiMsg;
}
/* restore content */
content = pkcs7->stream->content;
contentSz = pkcs7->stream->contentSz;
/* restore detached flag */
detached = pkcs7->stream->detached;
/* store certificate if needed */
if (length > 0 && in2Sz == 0) {
/* free tmpCert if not NULL */
XFREE(pkcs7->stream->tmpCert, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
pkcs7->stream->tmpCert = (byte*)XMALLOC(length,
pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (pkcs7->stream->tmpCert == NULL) {
ret = MEMORY_E;
break;
}
XMEMCPY(pkcs7->stream->tmpCert, pkiMsg2 + idx, length);
pkiMsg2 = pkcs7->stream->tmpCert;
pkiMsg2Sz = length;
idx = 0;
}
#endif
if (length > 0) {
/* At this point, idx is at the first certificate in
* a set of certificates. There may be more than one,
* or none, or they may be a PKCS 6 extended
* certificate. We want to save the first cert if it
* is X.509. */
word32 certIdx = idx;
if (length < MAX_LENGTH_SZ + ASN_TAG_SZ)
ret = BUFFER_E;
if (pkiMsg2[certIdx++] == (ASN_CONSTRUCTED | ASN_SEQUENCE)) {
if (GetLength(pkiMsg2, &certIdx, &certSz, pkiMsg2Sz) < 0)
ret = ASN_PARSE_E;
cert = &pkiMsg2[idx];
certSz += (certIdx - idx);
if (certSz > length) {
ret = BUFFER_E;
break;
}
}
#ifdef ASN_BER_TO_DER
der = pkcs7->der;
#endif
contentDynamic = pkcs7->contentDynamic;
if (ret == 0) {
#ifndef NO_PKCS7_STREAM
PKCS7State* stream = pkcs7->stream;
#endif
/* This will reset PKCS7 structure and then set the
* certificate */
ret = wc_PKCS7_InitWithCert(pkcs7, cert, certSz);
#ifndef NO_PKCS7_STREAM
pkcs7->stream = stream;
#endif
}
pkcs7->contentDynamic = contentDynamic;
#ifdef ASN_BER_TO_DER
pkcs7->der = der;
#endif
if (ret != 0)
break;
/* iterate through any additional certificates */
if (ret == 0 && MAX_PKCS7_CERTS > 0) {
int sz = 0;
int i;
pkcs7->cert[0] = cert;
pkcs7->certSz[0] = certSz;
certIdx = idx + certSz;
for (i = 1; i < MAX_PKCS7_CERTS &&
certIdx + 1 < pkiMsg2Sz &&
certIdx + 1 < (word32)length; i++) {
localIdx = certIdx;
if (pkiMsg2[certIdx++] ==
(ASN_CONSTRUCTED | ASN_SEQUENCE)) {
if (GetLength(pkiMsg2, &certIdx, &sz,
pkiMsg2Sz) < 0) {
ret = ASN_PARSE_E;
break;
}
pkcs7->cert[i] = &pkiMsg2[localIdx];
pkcs7->certSz[i] = sz + (certIdx - localIdx);
certIdx += sz;
}
}
}
}
idx += length;
}
if (!detached) {
/* set content and size after init of PKCS7 structure */
pkcs7->content = content;
pkcs7->contentSz = contentSz;
}
#ifndef NO_PKCS7_STREAM
else {
/* save content if detached and using streaming API */
if (pkcs7->content != NULL) {
XFREE(pkcs7->stream->content, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
pkcs7->stream->content = (byte*)XMALLOC(pkcs7->contentSz,
pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (pkcs7->stream->content == NULL) {
ret = MEMORY_E;
break;
}
else {
XMEMCPY(pkcs7->stream->content, pkcs7->content,
contentSz);
pkcs7->stream->contentSz = pkcs7->contentSz;
}
}
}
#endif
if (ret != 0) {
break;
}
#ifndef NO_PKCS7_STREAM
/* factor in that recent idx was in cert buffer. If in2 buffer was
* used then don't advance idx. */
if (pkcs7->stream->flagOne && pkcs7->stream->length == 0) {
idx = stateIdx + idx;
if (idx > inSz) {
/* index is more than input size */
ret = BUFFER_E;
break;
}
}
else {
stateIdx = idx; /* didn't read any from internal buffer */
}
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &stateIdx, &idx)) != 0) {
break;
}
if (pkcs7->stream->flagOne && pkcs7->stream->length > 0) {
idx = stateIdx + idx;
}
pkcs7->stream->expected = MAX_OID_SZ + ASN_TAG_SZ + MAX_LENGTH_SZ +
MAX_SET_SZ;
if (pkcs7->stream->expected > (pkcs7->stream->maxLen -
pkcs7->stream->totalRd) + pkcs7->stream->length)
pkcs7->stream->expected = (pkcs7->stream->maxLen -
pkcs7->stream->totalRd) + pkcs7->stream->length;
wc_PKCS7_StreamGetVar(pkcs7, &pkiMsg2Sz, 0, 0);
wc_PKCS7_StreamStoreVar(pkcs7, pkiMsg2Sz, 0, length);
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_VERIFY_STAGE5);
FALL_THROUGH;
case WC_PKCS7_VERIFY_STAGE5:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz + in2Sz,
pkcs7->stream->expected, &pkiMsg, &idx)) != 0) {
break;
}
wc_PKCS7_StreamGetVar(pkcs7, &pkiMsg2Sz, 0, &length);
if (pkcs7->stream->flagOne) {
pkiMsg2 = pkiMsg;
}
/* restore content type */
contentType = pkcs7->stream->nonce;
contentTypeSz = pkcs7->stream->nonceSz;
#endif
/* set contentType and size after init of PKCS7 structure */
if (ret == 0 && wc_PKCS7_SetContentType(pkcs7, contentType,
contentTypeSz) < 0)
ret = ASN_PARSE_E;
/* Get the implicit[1] set of crls */
if (ret == 0 && idx >= pkiMsg2Sz)
ret = BUFFER_E;
if (ret == 0 && pkiMsg2[idx] ==
(ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC | 1)) {
idx++;
if (GetLength(pkiMsg2, &idx, &length, pkiMsg2Sz) < 0)
ret = ASN_PARSE_E;
/* Skip the set */
idx += length;
}
/* Get the set of signerInfos */
if (ret == 0 && GetSet(pkiMsg2, &idx, &length, pkiMsg2Sz) < 0)
ret = ASN_PARSE_E;
if (ret != 0)
break;
#ifndef NO_PKCS7_STREAM
if (!pkcs7->stream->flagOne) {
stateIdx = idx; /* didn't read any from internal buffer */
}
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &stateIdx, &idx)) != 0) {
break;
}
wc_PKCS7_StreamStoreVar(pkcs7, pkiMsg2Sz, 0, length);
if (length > 0) {
pkcs7->stream->expected = length;
}
else {
pkcs7->stream->expected = 0;
}
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_VERIFY_STAGE6);
FALL_THROUGH;
case WC_PKCS7_VERIFY_STAGE6:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz + in2Sz,
pkcs7->stream->expected, &pkiMsg, &idx)) != 0) {
break;
}
wc_PKCS7_StreamGetVar(pkcs7, &pkiMsg2Sz, 0, &length);
if (pkcs7->stream->flagOne) {
pkiMsg2 = pkiMsg;
}
/* restore content */
content = pkcs7->stream->content;
contentSz = pkcs7->stream->contentSz;
#endif
/* require a signer if degenerate case not allowed */
if (ret == 0 && length == 0 && pkcs7->noDegenerate == 1)
ret = PKCS7_NO_SIGNER_E;
if (ret == 0 && degenerate == 0 && length == 0) {
WOLFSSL_MSG("PKCS7 signers expected");
ret = PKCS7_NO_SIGNER_E;
}
if (ret == 0 && length > 0 && degenerate == 0) {
/* Get the sequence of the first signerInfo */
if (ret == 0 && GetSequence(pkiMsg2, &idx, &length,
pkiMsg2Sz) < 0)
ret = ASN_PARSE_E;
/* Get the version */
if (ret == 0 && GetMyVersion(pkiMsg2, &idx, &version,
pkiMsg2Sz) < 0)
ret = ASN_PARSE_E;
if (ret == 0 && version == 1) {
/* Get the sequence of IssuerAndSerialNumber */
if (GetSequence(pkiMsg2, &idx, &length, pkiMsg2Sz) < 0)
ret = ASN_PARSE_E;
/* Skip it */
idx += length;
} else if (ret == 0 && version == 3) {
/* Get the sequence of SubjectKeyIdentifier */
if (pkiMsg2[idx++] != (ASN_CONSTRUCTED |
ASN_CONTEXT_SPECIFIC | 0)) {
ret = ASN_PARSE_E;
}
if (ret == 0 && GetLength(pkiMsg2, &idx, &length,
pkiMsg2Sz) <= 0) {
ret = ASN_PARSE_E;
}
if (ret == 0 && pkiMsg2[idx++] != ASN_OCTET_STRING)
ret = ASN_PARSE_E;
if (ret == 0 && GetLength(pkiMsg2, &idx, &length, pkiMsg2Sz) < 0)
ret = ASN_PARSE_E;
/* Skip it */
idx += length;
} else {
WOLFSSL_MSG("PKCS#7 signerInfo version must be 1 or 3");
ret = ASN_VERSION_E;
}
/* Get the sequence of digestAlgorithm */
if (ret == 0 && GetAlgoId(pkiMsg2, &idx, &hashOID, oidHashType,
pkiMsg2Sz) < 0) {
ret = ASN_PARSE_E;
}
pkcs7->hashOID = (int)hashOID;
/* Get the IMPLICIT[0] SET OF signedAttributes */
if (ret == 0 && pkiMsg2[idx] ==
(ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC | 0)) {
idx++;
if (GetLength(pkiMsg2, &idx, &length, pkiMsg2Sz) < 0)
ret = ASN_PARSE_E;
/* save pointer and length */
signedAttrib = &pkiMsg2[idx];
signedAttribSz = length;
if (ret == 0 && wc_PKCS7_ParseAttribs(pkcs7, signedAttrib,
signedAttribSz) < 0) {
WOLFSSL_MSG("Error parsing signed attributes");
ret = ASN_PARSE_E;
}
idx += length;
}
/* Get digestEncryptionAlgorithm */
if (ret == 0 && GetAlgoId(pkiMsg2, &idx, &sigOID, oidSigType,
pkiMsg2Sz) < 0) {
ret = ASN_PARSE_E;
break;
}
/* store public key type based on digestEncryptionAlgorithm */
if ((ret = 0) && ((ret = wc_PKCS7_SetPublicKeyOID(pkcs7, sigOID))
<= 0)) {
WOLFSSL_MSG("Failed to set public key OID from signature");
}
if (idx >= pkiMsg2Sz)
ret = BUFFER_E;
/* Get the signature */
if (ret == 0 && pkiMsg2[idx] == ASN_OCTET_STRING) {
idx++;
if (GetLength(pkiMsg2, &idx, &length, pkiMsg2Sz) < 0)
ret = ASN_PARSE_E;
/* save pointer and length */
sig = &pkiMsg2[idx];
sigSz = length;
idx += length;
}
pkcs7->content = content;
pkcs7->contentSz = contentSz;
if (ret == 0) {
ret = wc_PKCS7_SignedDataVerifySignature(pkcs7, sig, sigSz,
signedAttrib, signedAttribSz,
hashBuf, hashSz);
}
}
if (ret < 0)
break;
ret = 0; /* success */
#ifndef NO_PKCS7_STREAM
wc_PKCS7_ResetStream(pkcs7);
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_START);
break;
default:
WOLFSSL_MSG("PKCS7 Unknown verify state");
ret = BAD_FUNC_ARG;
}
if (ret != 0 && ret != WC_PKCS7_WANT_READ_E) {
#ifndef NO_PKCS7_STREAM
wc_PKCS7_ResetStream(pkcs7);
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_START);
}
return ret;
}
/* variant that allows computed data hash and header/foot,
* which is useful for large data signing */
int wc_PKCS7_VerifySignedData_ex(PKCS7* pkcs7, const byte* hashBuf,
word32 hashSz, byte* pkiMsgHead, word32 pkiMsgHeadSz, byte* pkiMsgFoot,
word32 pkiMsgFootSz)
{
return PKCS7_VerifySignedData(pkcs7, hashBuf, hashSz,
pkiMsgHead, pkiMsgHeadSz, pkiMsgFoot, pkiMsgFootSz);
}
int wc_PKCS7_VerifySignedData(PKCS7* pkcs7, byte* pkiMsg, word32 pkiMsgSz)
{
return PKCS7_VerifySignedData(pkcs7, NULL, 0, pkiMsg, pkiMsgSz, NULL, 0);
}
/* Generate random content encryption key, store into pkcs7->cek and
* pkcs7->cekSz.
*
* pkcs7 - pointer to initialized PKCS7 structure
* len - length of key to be generated
*
* Returns 0 on success, negative upon error */
static int PKCS7_GenerateContentEncryptionKey(PKCS7* pkcs7, word32 len)
{
int ret;
WC_RNG rng;
byte* tmpKey;
if (pkcs7 == NULL || len == 0)
return BAD_FUNC_ARG;
/* if key already exists, don't need to re-generate */
if (pkcs7->cek != NULL && pkcs7->cekSz != 0) {
/* if key exists, but is different size, return error */
if (pkcs7->cekSz != len) {
WOLFSSL_MSG("Random content-encryption key size is inconsistent "
"between CMS recipients");
return WC_KEY_SIZE_E;
}
return 0;
}
/* allocate space for cek */
tmpKey = (byte*)XMALLOC(len, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (tmpKey == NULL)
return MEMORY_E;
XMEMSET(tmpKey, 0, len);
ret = wc_InitRng_ex(&rng, pkcs7->heap, pkcs7->devId);
if (ret != 0) {
XFREE(tmpKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
ret = wc_RNG_GenerateBlock(&rng, tmpKey, len);
if (ret != 0) {
wc_FreeRng(&rng);
XFREE(tmpKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
/* store into PKCS7, memory freed during final cleanup */
pkcs7->cek = tmpKey;
pkcs7->cekSz = len;
wc_FreeRng(&rng);
return 0;
}
/* wrap CEK (content encryption key) with KEK, 0 on success, < 0 on error */
static int wc_PKCS7_KeyWrap(byte* cek, word32 cekSz, byte* kek,
word32 kekSz, byte* out, word32 outSz,
int keyWrapAlgo, int direction)
{
int ret;
if (cek == NULL || kek == NULL || out == NULL)
return BAD_FUNC_ARG;
switch (keyWrapAlgo) {
#ifndef NO_AES
#ifdef WOLFSSL_AES_128
case AES128_WRAP:
#endif
#ifdef WOLFSSL_AES_192
case AES192_WRAP:
#endif
#ifdef WOLFSSL_AES_256
case AES256_WRAP:
#endif
if (direction == AES_ENCRYPTION) {
ret = wc_AesKeyWrap(kek, kekSz, cek, cekSz,
out, outSz, NULL);
} else if (direction == AES_DECRYPTION) {
ret = wc_AesKeyUnWrap(kek, kekSz, cek, cekSz,
out, outSz, NULL);
} else {
WOLFSSL_MSG("Bad key un/wrap direction");
return BAD_FUNC_ARG;
}
if (ret <= 0)
return ret;
break;
#endif /* NO_AES */
default:
WOLFSSL_MSG("Unsupported key wrap algorithm");
return BAD_KEYWRAP_ALG_E;
};
(void)cekSz;
(void)kekSz;
(void)outSz;
(void)direction;
return ret;
}
#ifdef HAVE_ECC
/* KARI == KeyAgreeRecipientInfo (key agreement) */
typedef struct WC_PKCS7_KARI {
DecodedCert* decoded; /* decoded recip cert */
void* heap; /* user heap, points to PKCS7->heap */
int devId; /* device ID for HW based private key */
ecc_key* recipKey; /* recip key (pub | priv) */
ecc_key* senderKey; /* sender key (pub | priv) */
byte* senderKeyExport; /* sender ephemeral key DER */
byte* kek; /* key encryption key */
byte* ukm; /* OPTIONAL user keying material */
byte* sharedInfo; /* ECC-CMS-SharedInfo ASN.1 encoded blob */
word32 senderKeyExportSz; /* size of sender ephemeral key DER */
word32 kekSz; /* size of key encryption key */
word32 ukmSz; /* size of user keying material */
word32 sharedInfoSz; /* size of ECC-CMS-SharedInfo encoded */
byte ukmOwner; /* do we own ukm buffer? 1:yes, 0:no */
byte direction; /* WC_PKCS7_ENCODE | WC_PKCS7_DECODE */
byte decodedInit : 1; /* indicates decoded was initialized */
byte recipKeyInit : 1; /* indicates recipKey was initialized */
byte senderKeyInit : 1; /* indicates senderKey was initialized */
} WC_PKCS7_KARI;
/* allocate and create new WC_PKCS7_KARI struct,
* returns struct pointer on success, NULL on failure */
static WC_PKCS7_KARI* wc_PKCS7_KariNew(PKCS7* pkcs7, byte direction)
{
WC_PKCS7_KARI* kari = NULL;
if (pkcs7 == NULL)
return NULL;
kari = (WC_PKCS7_KARI*)XMALLOC(sizeof(WC_PKCS7_KARI), pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (kari == NULL) {
WOLFSSL_MSG("Failed to allocate WC_PKCS7_KARI");
return NULL;
}
kari->decoded = (DecodedCert*)XMALLOC(sizeof(DecodedCert), pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (kari->decoded == NULL) {
WOLFSSL_MSG("Failed to allocate DecodedCert");
XFREE(kari, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return NULL;
}
kari->recipKey = (ecc_key*)XMALLOC(sizeof(ecc_key), pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (kari->recipKey == NULL) {
WOLFSSL_MSG("Failed to allocate recipient ecc_key");
XFREE(kari->decoded, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(kari, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return NULL;
}
kari->senderKey = (ecc_key*)XMALLOC(sizeof(ecc_key), pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (kari->senderKey == NULL) {
WOLFSSL_MSG("Failed to allocate sender ecc_key");
XFREE(kari->recipKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(kari->decoded, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(kari, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return NULL;
}
kari->senderKeyExport = NULL;
kari->senderKeyExportSz = 0;
kari->kek = NULL;
kari->kekSz = 0;
kari->ukm = NULL;
kari->ukmSz = 0;
kari->ukmOwner = 0;
kari->sharedInfo = NULL;
kari->sharedInfoSz = 0;
kari->direction = direction;
kari->decodedInit = 0;
kari->recipKeyInit = 0;
kari->senderKeyInit = 0;
kari->heap = pkcs7->heap;
kari->devId = pkcs7->devId;
return kari;
}
/* free WC_PKCS7_KARI struct, return 0 on success */
static int wc_PKCS7_KariFree(WC_PKCS7_KARI* kari)
{
void* heap;
if (kari) {
heap = kari->heap;
if (kari->decoded) {
if (kari->decodedInit)
FreeDecodedCert(kari->decoded);
XFREE(kari->decoded, heap, DYNAMIC_TYPE_PKCS7);
}
if (kari->senderKey) {
if (kari->senderKeyInit)
wc_ecc_free(kari->senderKey);
XFREE(kari->senderKey, heap, DYNAMIC_TYPE_PKCS7);
}
if (kari->recipKey) {
if (kari->recipKeyInit)
wc_ecc_free(kari->recipKey);
XFREE(kari->recipKey, heap, DYNAMIC_TYPE_PKCS7);
}
if (kari->senderKeyExport) {
ForceZero(kari->senderKeyExport, kari->senderKeyExportSz);
XFREE(kari->senderKeyExport, heap, DYNAMIC_TYPE_PKCS7);
kari->senderKeyExportSz = 0;
}
if (kari->kek) {
ForceZero(kari->kek, kari->kekSz);
XFREE(kari->kek, heap, DYNAMIC_TYPE_PKCS7);
kari->kekSz = 0;
}
if (kari->ukm) {
if (kari->ukmOwner == 1) {
XFREE(kari->ukm, heap, DYNAMIC_TYPE_PKCS7);
}
kari->ukmSz = 0;
}
if (kari->sharedInfo) {
ForceZero(kari->sharedInfo, kari->sharedInfoSz);
XFREE(kari->sharedInfo, heap, DYNAMIC_TYPE_PKCS7);
kari->sharedInfoSz = 0;
}
XFREE(kari, heap, DYNAMIC_TYPE_PKCS7);
}
(void)heap;
return 0;
}
/* parse recipient cert/key, return 0 on success, negative on error
* key/keySz only needed during decoding (WC_PKCS7_DECODE) */
static int wc_PKCS7_KariParseRecipCert(WC_PKCS7_KARI* kari, const byte* cert,
word32 certSz, const byte* key,
word32 keySz)
{
int ret;
word32 idx;
if (kari == NULL || kari->decoded == NULL ||
cert == NULL || certSz == 0)
return BAD_FUNC_ARG;
/* decode certificate */
InitDecodedCert(kari->decoded, (byte*)cert, certSz, kari->heap);
kari->decodedInit = 1;
ret = ParseCert(kari->decoded, CA_TYPE, NO_VERIFY, 0);
if (ret < 0)
return ret;
/* only supports ECDSA for now */
if (kari->decoded->keyOID != ECDSAk) {
WOLFSSL_MSG("CMS KARI only supports ECDSA key types");
return BAD_FUNC_ARG;
}
/* make sure subject key id was read from cert */
if (kari->decoded->extSubjKeyIdSet == 0) {
WOLFSSL_MSG("Failed to read subject key ID from recipient cert");
return BAD_FUNC_ARG;
}
ret = wc_ecc_init_ex(kari->recipKey, kari->heap, kari->devId);
if (ret != 0)
return ret;
kari->recipKeyInit = 1;
/* get recip public key */
if (kari->direction == WC_PKCS7_ENCODE) {
idx = 0;
ret = wc_EccPublicKeyDecode(kari->decoded->publicKey, &idx,
kari->recipKey, kari->decoded->pubKeySize);
if (ret != 0)
return ret;
}
/* get recip private key */
else if (kari->direction == WC_PKCS7_DECODE) {
if (key != NULL && keySz > 0) {
idx = 0;
ret = wc_EccPrivateKeyDecode(key, &idx, kari->recipKey, keySz);
}
else if (kari->devId == INVALID_DEVID) {
ret = BAD_FUNC_ARG;
}
if (ret != 0)
return ret;
} else {
/* bad direction */
return BAD_FUNC_ARG;
}
(void)idx;
return 0;
}
/* create ephemeral ECC key, places ecc_key in kari->senderKey,
* DER encoded in kari->senderKeyExport. return 0 on success,
* negative on error */
static int wc_PKCS7_KariGenerateEphemeralKey(WC_PKCS7_KARI* kari)
{
int ret;
WC_RNG rng;
if (kari == NULL || kari->decoded == NULL ||
kari->recipKey == NULL || kari->recipKey->dp == NULL)
return BAD_FUNC_ARG;
kari->senderKeyExport = (byte*)XMALLOC(kari->decoded->pubKeySize,
kari->heap, DYNAMIC_TYPE_PKCS7);
if (kari->senderKeyExport == NULL)
return MEMORY_E;
kari->senderKeyExportSz = kari->decoded->pubKeySize;
ret = wc_ecc_init_ex(kari->senderKey, kari->heap, kari->devId);
if (ret != 0) {
XFREE(kari->senderKeyExport, kari->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
kari->senderKeyInit = 1;
ret = wc_InitRng_ex(&rng, kari->heap, kari->devId);
if (ret != 0) {
XFREE(kari->senderKeyExport, kari->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
ret = wc_ecc_make_key_ex(&rng, kari->recipKey->dp->size,
kari->senderKey, kari->recipKey->dp->id);
if (ret != 0) {
XFREE(kari->senderKeyExport, kari->heap, DYNAMIC_TYPE_PKCS7);
wc_FreeRng(&rng);
return ret;
}
wc_FreeRng(&rng);
/* dump generated key to X.963 DER for output in CMS bundle */
ret = wc_ecc_export_x963(kari->senderKey, kari->senderKeyExport,
&kari->senderKeyExportSz);
if (ret != 0) {
XFREE(kari->senderKeyExport, kari->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
return 0;
}
/* create ASN.1 encoded ECC-CMS-SharedInfo using specified key wrap algorithm,
* place in kari->sharedInfo. returns 0 on success, negative on error */
static int wc_PKCS7_KariGenerateSharedInfo(WC_PKCS7_KARI* kari, int keyWrapOID)
{
int idx = 0;
int sharedInfoSeqSz = 0;
int keyInfoSz = 0;
int suppPubInfoSeqSz = 0;
int entityUInfoOctetSz = 0;
int entityUInfoExplicitSz = 0;
int kekOctetSz = 0;
int sharedInfoSz = 0;
word32 kekBitSz = 0;
byte sharedInfoSeq[MAX_SEQ_SZ];
byte keyInfo[MAX_ALGO_SZ];
byte suppPubInfoSeq[MAX_SEQ_SZ];
byte entityUInfoOctet[MAX_OCTET_STR_SZ];
byte entityUInfoExplicitSeq[MAX_SEQ_SZ];
byte kekOctet[MAX_OCTET_STR_SZ];
if (kari == NULL)
return BAD_FUNC_ARG;
if ((kari->ukmSz > 0) && (kari->ukm == NULL))
return BAD_FUNC_ARG;
/* kekOctet */
kekOctetSz = SetOctetString(sizeof(word32), kekOctet);
sharedInfoSz += (kekOctetSz + sizeof(word32));
/* suppPubInfo */
suppPubInfoSeqSz = SetImplicit(ASN_SEQUENCE, 2,
kekOctetSz + sizeof(word32),
suppPubInfoSeq);
sharedInfoSz += suppPubInfoSeqSz;
/* optional ukm/entityInfo */
if (kari->ukmSz > 0) {
entityUInfoOctetSz = SetOctetString(kari->ukmSz, entityUInfoOctet);
sharedInfoSz += (entityUInfoOctetSz + kari->ukmSz);
entityUInfoExplicitSz = SetExplicit(0, entityUInfoOctetSz +
kari->ukmSz,
entityUInfoExplicitSeq);
sharedInfoSz += entityUInfoExplicitSz;
}
/* keyInfo */
keyInfoSz = SetAlgoID(keyWrapOID, keyInfo, oidKeyWrapType, 0);
sharedInfoSz += keyInfoSz;
/* sharedInfo */
sharedInfoSeqSz = SetSequence(sharedInfoSz, sharedInfoSeq);
sharedInfoSz += sharedInfoSeqSz;
kari->sharedInfo = (byte*)XMALLOC(sharedInfoSz, kari->heap,
DYNAMIC_TYPE_PKCS7);
if (kari->sharedInfo == NULL)
return MEMORY_E;
kari->sharedInfoSz = sharedInfoSz;
XMEMCPY(kari->sharedInfo + idx, sharedInfoSeq, sharedInfoSeqSz);
idx += sharedInfoSeqSz;
XMEMCPY(kari->sharedInfo + idx, keyInfo, keyInfoSz);
idx += keyInfoSz;
if (kari->ukmSz > 0) {
XMEMCPY(kari->sharedInfo + idx, entityUInfoExplicitSeq,
entityUInfoExplicitSz);
idx += entityUInfoExplicitSz;
XMEMCPY(kari->sharedInfo + idx, entityUInfoOctet, entityUInfoOctetSz);
idx += entityUInfoOctetSz;
XMEMCPY(kari->sharedInfo + idx, kari->ukm, kari->ukmSz);
idx += kari->ukmSz;
}
XMEMCPY(kari->sharedInfo + idx, suppPubInfoSeq, suppPubInfoSeqSz);
idx += suppPubInfoSeqSz;
XMEMCPY(kari->sharedInfo + idx, kekOctet, kekOctetSz);
idx += kekOctetSz;
kekBitSz = (kari->kekSz) * 8; /* convert to bits */
#ifdef LITTLE_ENDIAN_ORDER
kekBitSz = ByteReverseWord32(kekBitSz); /* network byte order */
#endif
XMEMCPY(kari->sharedInfo + idx, &kekBitSz, sizeof(kekBitSz));
return 0;
}
/* create key encryption key (KEK) using key wrap algorithm and key encryption
* algorithm, place in kari->kek. return 0 on success, <0 on error. */
static int wc_PKCS7_KariGenerateKEK(WC_PKCS7_KARI* kari,
int keyWrapOID, int keyEncOID)
{
int ret;
int kSz;
enum wc_HashType kdfType;
byte* secret;
word32 secretSz;
if (kari == NULL || kari->recipKey == NULL ||
kari->senderKey == NULL || kari->senderKey->dp == NULL)
return BAD_FUNC_ARG;
/* get KEK size, allocate buff */
kSz = wc_PKCS7_GetOIDKeySize(keyWrapOID);
if (kSz < 0)
return kSz;
kari->kek = (byte*)XMALLOC(kSz, kari->heap, DYNAMIC_TYPE_PKCS7);
if (kari->kek == NULL)
return MEMORY_E;
kari->kekSz = (word32)kSz;
/* generate ECC-CMS-SharedInfo */
ret = wc_PKCS7_KariGenerateSharedInfo(kari, keyWrapOID);
if (ret != 0)
return ret;
/* generate shared secret */
secretSz = kari->senderKey->dp->size;
secret = (byte*)XMALLOC(secretSz, kari->heap, DYNAMIC_TYPE_PKCS7);
if (secret == NULL)
return MEMORY_E;
if (kari->direction == WC_PKCS7_ENCODE) {
ret = wc_ecc_shared_secret(kari->senderKey, kari->recipKey,
secret, &secretSz);
} else if (kari->direction == WC_PKCS7_DECODE) {
ret = wc_ecc_shared_secret(kari->recipKey, kari->senderKey,
secret, &secretSz);
} else {
/* bad direction */
XFREE(secret, kari->heap, DYNAMIC_TYPE_PKCS7);
return BAD_FUNC_ARG;
}
if (ret != 0) {
XFREE(secret, kari->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
/* run through KDF */
switch (keyEncOID) {
#ifndef NO_SHA
case dhSinglePass_stdDH_sha1kdf_scheme:
kdfType = WC_HASH_TYPE_SHA;
break;
#endif
#ifndef WOLFSSL_SHA224
case dhSinglePass_stdDH_sha224kdf_scheme:
kdfType = WC_HASH_TYPE_SHA224;
break;
#endif
#ifndef NO_SHA256
case dhSinglePass_stdDH_sha256kdf_scheme:
kdfType = WC_HASH_TYPE_SHA256;
break;
#endif
#ifdef WOLFSSL_SHA384
case dhSinglePass_stdDH_sha384kdf_scheme:
kdfType = WC_HASH_TYPE_SHA384;
break;
#endif
#ifdef WOLFSSL_SHA512
case dhSinglePass_stdDH_sha512kdf_scheme:
kdfType = WC_HASH_TYPE_SHA512;
break;
#endif
default:
WOLFSSL_MSG("Unsupported key agreement algorithm");
XFREE(secret, kari->heap, DYNAMIC_TYPE_PKCS7);
return BAD_FUNC_ARG;
};
ret = wc_X963_KDF(kdfType, secret, secretSz, kari->sharedInfo,
kari->sharedInfoSz, kari->kek, kari->kekSz);
if (ret != 0) {
XFREE(secret, kari->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
XFREE(secret, kari->heap, DYNAMIC_TYPE_PKCS7);
return 0;
}
/* Encode and add CMS EnvelopedData KARI (KeyAgreeRecipientInfo) RecipientInfo
* to CMS/PKCS#7 EnvelopedData structure.
*
* Returns 0 on success, negative upon error */
int wc_PKCS7_AddRecipient_KARI(PKCS7* pkcs7, const byte* cert, word32 certSz,
int keyWrapOID, int keyAgreeOID, byte* ukm,
word32 ukmSz, int options)
{
Pkcs7EncodedRecip* recip = NULL;
Pkcs7EncodedRecip* lastRecip = NULL;
WC_PKCS7_KARI* kari = NULL;
word32 idx = 0;
word32 encryptedKeySz = MAX_ENCRYPTED_KEY_SZ;
int ret = 0;
int keySz, direction = 0;
int blockKeySz = 0;
/* ASN.1 layout */
int totalSz = 0;
int kariSeqSz = 0;
byte kariSeq[MAX_SEQ_SZ]; /* IMPLICIT [1] */
int verSz = 0;
byte ver[MAX_VERSION_SZ];
int origIdOrKeySeqSz = 0;
byte origIdOrKeySeq[MAX_SEQ_SZ]; /* IMPLICIT [0] */
int origPubKeySeqSz = 0;
byte origPubKeySeq[MAX_SEQ_SZ]; /* IMPLICIT [1] */
int origAlgIdSz = 0;
byte origAlgId[MAX_ALGO_SZ];
int origPubKeyStrSz = 0;
byte origPubKeyStr[MAX_OCTET_STR_SZ];
/* optional user keying material */
int ukmOctetSz = 0;
byte ukmOctetStr[MAX_OCTET_STR_SZ];
int ukmExplicitSz = 0;
byte ukmExplicitSeq[MAX_SEQ_SZ];
int keyEncryptAlgoIdSz = 0;
byte keyEncryptAlgoId[MAX_ALGO_SZ];
int keyWrapAlgSz = 0;
byte keyWrapAlg[MAX_ALGO_SZ];
int recipEncKeysSeqSz = 0;
byte recipEncKeysSeq[MAX_SEQ_SZ];
int recipEncKeySeqSz = 0;
byte recipEncKeySeq[MAX_SEQ_SZ];
int recipKeyIdSeqSz = 0;
byte recipKeyIdSeq[MAX_SEQ_SZ]; /* IMPLICIT [0] */
int subjKeyIdOctetSz = 0;
byte subjKeyIdOctet[MAX_OCTET_STR_SZ];
int encryptedKeyOctetSz = 0;
byte encryptedKeyOctet[MAX_OCTET_STR_SZ];
#ifdef WOLFSSL_SMALL_STACK
byte* encryptedKey;
encryptedKey = (byte*)XMALLOC(MAX_ENCRYPTED_KEY_SZ, pkcs7->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (encryptedKey == NULL) {
return MEMORY_E;
}
#else
byte encryptedKey[MAX_ENCRYPTED_KEY_SZ];
#endif
/* allocate and init memory for recipient */
recip = (Pkcs7EncodedRecip*)XMALLOC(sizeof(Pkcs7EncodedRecip), pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (recip == NULL) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return MEMORY_E;
}
XMEMSET(recip, 0, sizeof(Pkcs7EncodedRecip));
/* get key size for content-encryption key based on algorithm */
blockKeySz = wc_PKCS7_GetOIDKeySize(pkcs7->encryptOID);
if (blockKeySz < 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return blockKeySz;
}
/* generate random content encryption key, if needed */
ret = PKCS7_GenerateContentEncryptionKey(pkcs7, blockKeySz);
if (ret < 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
/* set direction based on keyWrapAlgo */
switch (keyWrapOID) {
#ifndef NO_AES
#ifdef WOLFSSL_AES_128
case AES128_WRAP:
#endif
#ifdef WOLFSSL_AES_192
case AES192_WRAP:
#endif
#ifdef WOLFSSL_AES_256
case AES256_WRAP:
#endif
direction = AES_ENCRYPTION;
break;
#endif
default:
WOLFSSL_MSG("Unsupported key wrap algorithm");
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return BAD_KEYWRAP_ALG_E;
}
kari = wc_PKCS7_KariNew(pkcs7, WC_PKCS7_ENCODE);
if (kari == NULL) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return MEMORY_E;
}
/* set user keying material if available */
if (ukmSz > 0 && ukm != NULL) {
kari->ukm = ukm;
kari->ukmSz = ukmSz;
kari->ukmOwner = 0;
}
/* parse recipient cert, get public key */
ret = wc_PKCS7_KariParseRecipCert(kari, cert, certSz, NULL, 0);
if (ret != 0) {
wc_PKCS7_KariFree(kari);
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
/* generate sender ephemeral ECC key */
ret = wc_PKCS7_KariGenerateEphemeralKey(kari);
if (ret != 0) {
wc_PKCS7_KariFree(kari);
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
/* generate KEK (key encryption key) */
ret = wc_PKCS7_KariGenerateKEK(kari, keyWrapOID, keyAgreeOID);
if (ret != 0) {
wc_PKCS7_KariFree(kari);
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
/* encrypt CEK with KEK */
keySz = wc_PKCS7_KeyWrap(pkcs7->cek, pkcs7->cekSz, kari->kek,
kari->kekSz, encryptedKey, encryptedKeySz,
keyWrapOID, direction);
if (keySz <= 0) {
wc_PKCS7_KariFree(kari);
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return keySz;
}
encryptedKeySz = (word32)keySz;
/* Start of RecipientEncryptedKeys */
/* EncryptedKey */
encryptedKeyOctetSz = SetOctetString(encryptedKeySz, encryptedKeyOctet);
totalSz += (encryptedKeyOctetSz + encryptedKeySz);
/* SubjectKeyIdentifier */
subjKeyIdOctetSz = SetOctetString(KEYID_SIZE, subjKeyIdOctet);
totalSz += (subjKeyIdOctetSz + KEYID_SIZE);
/* RecipientKeyIdentifier IMPLICIT [0] */
recipKeyIdSeqSz = SetImplicit(ASN_SEQUENCE, 0, subjKeyIdOctetSz +
KEYID_SIZE, recipKeyIdSeq);
totalSz += recipKeyIdSeqSz;
/* RecipientEncryptedKey */
recipEncKeySeqSz = SetSequence(totalSz, recipEncKeySeq);
totalSz += recipEncKeySeqSz;
/* RecipientEncryptedKeys */
recipEncKeysSeqSz = SetSequence(totalSz, recipEncKeysSeq);
totalSz += recipEncKeysSeqSz;
/* Start of optional UserKeyingMaterial */
if (kari->ukmSz > 0) {
ukmOctetSz = SetOctetString(kari->ukmSz, ukmOctetStr);
totalSz += (ukmOctetSz + kari->ukmSz);
ukmExplicitSz = SetExplicit(1, ukmOctetSz + kari->ukmSz,
ukmExplicitSeq);
totalSz += ukmExplicitSz;
}
/* Start of KeyEncryptionAlgorithmIdentifier */
/* KeyWrapAlgorithm */
keyWrapAlgSz = SetAlgoID(keyWrapOID, keyWrapAlg, oidKeyWrapType, 0);
totalSz += keyWrapAlgSz;
/* KeyEncryptionAlgorithmIdentifier */
keyEncryptAlgoIdSz = SetAlgoID(keyAgreeOID, keyEncryptAlgoId,
oidCmsKeyAgreeType, keyWrapAlgSz);
totalSz += keyEncryptAlgoIdSz;
/* Start of OriginatorIdentifierOrKey */
/* recipient ECPoint, public key */
XMEMSET(origPubKeyStr, 0, sizeof(origPubKeyStr)); /* no unused bits */
origPubKeyStr[0] = ASN_BIT_STRING;
origPubKeyStrSz = SetLength(kari->senderKeyExportSz + 1,
origPubKeyStr + 1) + 2;
totalSz += (origPubKeyStrSz + kari->senderKeyExportSz);
/* Originator AlgorithmIdentifier */
origAlgIdSz = SetAlgoID(ECDSAk, origAlgId, oidKeyType, 0);
totalSz += origAlgIdSz;
/* outer OriginatorPublicKey IMPLICIT [1] */
origPubKeySeqSz = SetImplicit(ASN_SEQUENCE, 1,
origAlgIdSz + origPubKeyStrSz +
kari->senderKeyExportSz, origPubKeySeq);
totalSz += origPubKeySeqSz;
/* outer OriginatorIdentiferOrKey IMPLICIT [0] */
origIdOrKeySeqSz = SetImplicit(ASN_SEQUENCE, 0,
origPubKeySeqSz + origAlgIdSz +
origPubKeyStrSz + kari->senderKeyExportSz,
origIdOrKeySeq);
totalSz += origIdOrKeySeqSz;
/* version, always 3 */
verSz = SetMyVersion(3, ver, 0);
totalSz += verSz;
recip->recipVersion = 3;
/* outer IMPLICIT [1] kari */
kariSeqSz = SetImplicit(ASN_SEQUENCE, 1, totalSz, kariSeq);
totalSz += kariSeqSz;
if (totalSz > MAX_RECIP_SZ) {
WOLFSSL_MSG("KeyAgreeRecipientInfo output buffer too small");
wc_PKCS7_KariFree(kari);
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return BUFFER_E;
}
XMEMCPY(recip->recip + idx, kariSeq, kariSeqSz);
idx += kariSeqSz;
XMEMCPY(recip->recip + idx, ver, verSz);
idx += verSz;
XMEMCPY(recip->recip + idx, origIdOrKeySeq, origIdOrKeySeqSz);
idx += origIdOrKeySeqSz;
XMEMCPY(recip->recip + idx, origPubKeySeq, origPubKeySeqSz);
idx += origPubKeySeqSz;
XMEMCPY(recip->recip + idx, origAlgId, origAlgIdSz);
idx += origAlgIdSz;
XMEMCPY(recip->recip + idx, origPubKeyStr, origPubKeyStrSz);
idx += origPubKeyStrSz;
/* ephemeral public key */
XMEMCPY(recip->recip + idx, kari->senderKeyExport, kari->senderKeyExportSz);
idx += kari->senderKeyExportSz;
if (kari->ukmSz > 0) {
XMEMCPY(recip->recip + idx, ukmExplicitSeq, ukmExplicitSz);
idx += ukmExplicitSz;
XMEMCPY(recip->recip + idx, ukmOctetStr, ukmOctetSz);
idx += ukmOctetSz;
XMEMCPY(recip->recip + idx, kari->ukm, kari->ukmSz);
idx += kari->ukmSz;
}
XMEMCPY(recip->recip + idx, keyEncryptAlgoId, keyEncryptAlgoIdSz);
idx += keyEncryptAlgoIdSz;
XMEMCPY(recip->recip + idx, keyWrapAlg, keyWrapAlgSz);
idx += keyWrapAlgSz;
XMEMCPY(recip->recip + idx, recipEncKeysSeq, recipEncKeysSeqSz);
idx += recipEncKeysSeqSz;
XMEMCPY(recip->recip + idx, recipEncKeySeq, recipEncKeySeqSz);
idx += recipEncKeySeqSz;
XMEMCPY(recip->recip + idx, recipKeyIdSeq, recipKeyIdSeqSz);
idx += recipKeyIdSeqSz;
XMEMCPY(recip->recip + idx, subjKeyIdOctet, subjKeyIdOctetSz);
idx += subjKeyIdOctetSz;
/* subject key id */
XMEMCPY(recip->recip + idx, kari->decoded->extSubjKeyId, KEYID_SIZE);
idx += KEYID_SIZE;
XMEMCPY(recip->recip + idx, encryptedKeyOctet, encryptedKeyOctetSz);
idx += encryptedKeyOctetSz;
/* encrypted CEK */
XMEMCPY(recip->recip + idx, encryptedKey, encryptedKeySz);
idx += encryptedKeySz;
wc_PKCS7_KariFree(kari);
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
/* store recipient size */
recip->recipSz = idx;
recip->recipType = PKCS7_KARI;
/* add recipient to recip list */
if (pkcs7->recipList == NULL) {
pkcs7->recipList = recip;
} else {
lastRecip = pkcs7->recipList;
while (lastRecip->next != NULL) {
lastRecip = lastRecip->next;
}
lastRecip->next = recip;
}
(void)options;
return idx;
}
#endif /* HAVE_ECC */
#ifndef NO_RSA
/* Encode and add CMS EnvelopedData KTRI (KeyTransRecipientInfo) RecipientInfo
* to CMS/PKCS#7 EnvelopedData structure.
*
* Returns 0 on success, negative upon error */
int wc_PKCS7_AddRecipient_KTRI(PKCS7* pkcs7, const byte* cert, word32 certSz,
int options)
{
Pkcs7EncodedRecip* recip = NULL;
Pkcs7EncodedRecip* lastRecip = NULL;
WC_RNG rng;
word32 idx = 0;
word32 encryptedKeySz = 0;
int ret = 0, blockKeySz;
int verSz = 0, issuerSz = 0, snSz = 0, keyEncAlgSz = 0;
int issuerSeqSz = 0, recipSeqSz = 0, issuerSerialSeqSz = 0;
int encKeyOctetStrSz;
int sidType;
byte ver[MAX_VERSION_SZ];
byte issuerSerialSeq[MAX_SEQ_SZ];
byte recipSeq[MAX_SEQ_SZ];
byte issuerSeq[MAX_SEQ_SZ];
byte encKeyOctetStr[MAX_OCTET_STR_SZ];
byte issuerSKIDSeq[MAX_SEQ_SZ];
byte issuerSKID[MAX_OCTET_STR_SZ];
word32 issuerSKIDSeqSz = 0, issuerSKIDSz = 0;
#ifdef WOLFSSL_SMALL_STACK
byte* serial;
byte* keyAlgArray;
byte* encryptedKey;
RsaKey* pubKey;
DecodedCert* decoded;
serial = (byte*)XMALLOC(MAX_SN_SZ, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
keyAlgArray = (byte*)XMALLOC(MAX_SN_SZ, pkcs7->heap,
DYNAMIC_TYPE_TMP_BUFFER);
encryptedKey = (byte*)XMALLOC(MAX_ENCRYPTED_KEY_SZ, pkcs7->heap,
DYNAMIC_TYPE_TMP_BUFFER);
decoded = (DecodedCert*)XMALLOC(sizeof(DecodedCert), pkcs7->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (decoded == NULL || serial == NULL ||
encryptedKey == NULL || keyAlgArray == NULL) {
if (serial)
XFREE(serial, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
if (keyAlgArray)
XFREE(keyAlgArray, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
if (encryptedKey)
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
if (decoded)
XFREE(decoded, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
return MEMORY_E;
}
#else
byte serial[MAX_SN_SZ];
byte keyAlgArray[MAX_ALGO_SZ];
byte encryptedKey[MAX_ENCRYPTED_KEY_SZ];
RsaKey pubKey[1];
DecodedCert decoded[1];
#endif
encryptedKeySz = MAX_ENCRYPTED_KEY_SZ;
XMEMSET(encryptedKey, 0, encryptedKeySz);
/* default to IssuerAndSerialNumber if not set */
if (pkcs7->sidType != 0) {
sidType = pkcs7->sidType;
} else {
sidType = CMS_ISSUER_AND_SERIAL_NUMBER;
}
/* allow options to override SubjectIdentifier type if set */
if (options & CMS_SKID) {
sidType = CMS_SKID;
} else if (options & CMS_ISSUER_AND_SERIAL_NUMBER) {
sidType = CMS_ISSUER_AND_SERIAL_NUMBER;
}
/* allocate recipient struct */
recip = (Pkcs7EncodedRecip*)XMALLOC(sizeof(Pkcs7EncodedRecip), pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (recip == NULL) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(serial, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(keyAlgArray, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(decoded, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return MEMORY_E;
}
XMEMSET(recip, 0, sizeof(Pkcs7EncodedRecip));
/* get key size for content-encryption key based on algorithm */
blockKeySz = wc_PKCS7_GetOIDKeySize(pkcs7->encryptOID);
if (blockKeySz < 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(serial, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(keyAlgArray, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(decoded, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return blockKeySz;
}
/* generate random content encryption key, if needed */
ret = PKCS7_GenerateContentEncryptionKey(pkcs7, blockKeySz);
if (ret < 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(serial, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(keyAlgArray, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(decoded, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
InitDecodedCert(decoded, (byte*)cert, certSz, pkcs7->heap);
ret = ParseCert(decoded, CA_TYPE, NO_VERIFY, 0);
if (ret < 0) {
FreeDecodedCert(decoded);
#ifdef WOLFSSL_SMALL_STACK
XFREE(serial, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(keyAlgArray, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(decoded, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
if (sidType == CMS_ISSUER_AND_SERIAL_NUMBER) {
/* version, must be 0 for IssuerAndSerialNumber */
verSz = SetMyVersion(0, ver, 0);
recip->recipVersion = 0;
/* IssuerAndSerialNumber */
if (decoded->issuerRaw == NULL || decoded->issuerRawLen == 0) {
WOLFSSL_MSG("DecodedCert lacks raw issuer pointer and length");
FreeDecodedCert(decoded);
#ifdef WOLFSSL_SMALL_STACK
XFREE(serial, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(keyAlgArray, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(decoded, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return -1;
}
issuerSz = decoded->issuerRawLen;
issuerSeqSz = SetSequence(issuerSz, issuerSeq);
if (decoded->serialSz == 0) {
WOLFSSL_MSG("DecodedCert missing serial number");
FreeDecodedCert(decoded);
#ifdef WOLFSSL_SMALL_STACK
XFREE(serial, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(keyAlgArray, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(decoded, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return -1;
}
snSz = SetSerialNumber(decoded->serial, decoded->serialSz, serial,
MAX_SN_SZ);
issuerSerialSeqSz = SetSequence(issuerSeqSz + issuerSz + snSz,
issuerSerialSeq);
} else if (sidType == CMS_SKID) {
/* version, must be 2 for SubjectKeyIdentifier */
verSz = SetMyVersion(2, ver, 0);
recip->recipVersion = 2;
issuerSKIDSz = SetOctetString(KEYID_SIZE, issuerSKID);
issuerSKIDSeqSz = SetExplicit(0, issuerSKIDSz + KEYID_SIZE,
issuerSKIDSeq);
} else {
FreeDecodedCert(decoded);
#ifdef WOLFSSL_SMALL_STACK
XFREE(serial, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(keyAlgArray, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(decoded, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return PKCS7_RECIP_E;
}
pkcs7->publicKeyOID = decoded->keyOID;
/* KeyEncryptionAlgorithmIdentifier, only support RSA now */
if (pkcs7->publicKeyOID != RSAk) {
FreeDecodedCert(decoded);
#ifdef WOLFSSL_SMALL_STACK
XFREE(serial, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(keyAlgArray, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(decoded, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ALGO_ID_E;
}
keyEncAlgSz = SetAlgoID(pkcs7->publicKeyOID, keyAlgArray, oidKeyType, 0);
if (keyEncAlgSz == 0) {
FreeDecodedCert(decoded);
#ifdef WOLFSSL_SMALL_STACK
XFREE(serial, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(keyAlgArray, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(decoded, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return BAD_FUNC_ARG;
}
#ifdef WOLFSSL_SMALL_STACK
pubKey = (RsaKey*)XMALLOC(sizeof(RsaKey), pkcs7->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (pubKey == NULL) {
FreeDecodedCert(decoded);
XFREE(serial, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(keyAlgArray, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(decoded, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return MEMORY_E;
}
#endif
/* EncryptedKey */
ret = wc_InitRsaKey_ex(pubKey, pkcs7->heap, INVALID_DEVID);
if (ret != 0) {
FreeDecodedCert(decoded);
#ifdef WOLFSSL_SMALL_STACK
XFREE(pubKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(serial, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(keyAlgArray, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(decoded, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
if (wc_RsaPublicKeyDecode(decoded->publicKey, &idx, pubKey,
decoded->pubKeySize) < 0) {
WOLFSSL_MSG("ASN RSA key decode error");
wc_FreeRsaKey(pubKey);
FreeDecodedCert(decoded);
#ifdef WOLFSSL_SMALL_STACK
XFREE(pubKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(serial, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(keyAlgArray, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(decoded, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return PUBLIC_KEY_E;
}
ret = wc_InitRng_ex(&rng, pkcs7->heap, pkcs7->devId);
if (ret != 0) {
wc_FreeRsaKey(pubKey);
FreeDecodedCert(decoded);
#ifdef WOLFSSL_SMALL_STACK
XFREE(pubKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(serial, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(keyAlgArray, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(decoded, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return MEMORY_E;
}
ret = wc_RsaPublicEncrypt(pkcs7->cek, pkcs7->cekSz, encryptedKey,
encryptedKeySz, pubKey, &rng);
wc_FreeRsaKey(pubKey);
wc_FreeRng(&rng);
#ifdef WOLFSSL_SMALL_STACK
XFREE(pubKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
if (ret < 0) {
WOLFSSL_MSG("RSA Public Encrypt failed");
FreeDecodedCert(decoded);
#ifdef WOLFSSL_SMALL_STACK
XFREE(serial, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(keyAlgArray, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(decoded, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
encryptedKeySz = ret;
encKeyOctetStrSz = SetOctetString(encryptedKeySz, encKeyOctetStr);
/* RecipientInfo */
if (sidType == CMS_ISSUER_AND_SERIAL_NUMBER) {
recipSeqSz = SetSequence(verSz + issuerSerialSeqSz + issuerSeqSz +
issuerSz + snSz + keyEncAlgSz +
encKeyOctetStrSz + encryptedKeySz, recipSeq);
if (recipSeqSz + verSz + issuerSerialSeqSz + issuerSeqSz + snSz +
keyEncAlgSz + encKeyOctetStrSz + encryptedKeySz > MAX_RECIP_SZ) {
WOLFSSL_MSG("RecipientInfo output buffer too small");
FreeDecodedCert(decoded);
#ifdef WOLFSSL_SMALL_STACK
XFREE(serial, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(keyAlgArray, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(decoded, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return BUFFER_E;
}
} else {
recipSeqSz = SetSequence(verSz + issuerSKIDSeqSz + issuerSKIDSz +
KEYID_SIZE + keyEncAlgSz + encKeyOctetStrSz +
encryptedKeySz, recipSeq);
if (recipSeqSz + verSz + issuerSKIDSeqSz + issuerSKIDSz + KEYID_SIZE +
keyEncAlgSz + encKeyOctetStrSz + encryptedKeySz > MAX_RECIP_SZ) {
WOLFSSL_MSG("RecipientInfo output buffer too small");
FreeDecodedCert(decoded);
#ifdef WOLFSSL_SMALL_STACK
XFREE(serial, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(keyAlgArray, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(decoded, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return BUFFER_E;
}
}
idx = 0;
XMEMCPY(recip->recip + idx, recipSeq, recipSeqSz);
idx += recipSeqSz;
XMEMCPY(recip->recip + idx, ver, verSz);
idx += verSz;
if (sidType == CMS_ISSUER_AND_SERIAL_NUMBER) {
XMEMCPY(recip->recip + idx, issuerSerialSeq, issuerSerialSeqSz);
idx += issuerSerialSeqSz;
XMEMCPY(recip->recip + idx, issuerSeq, issuerSeqSz);
idx += issuerSeqSz;
XMEMCPY(recip->recip + idx, decoded->issuerRaw, issuerSz);
idx += issuerSz;
XMEMCPY(recip->recip + idx, serial, snSz);
idx += snSz;
} else {
XMEMCPY(recip->recip + idx, issuerSKIDSeq, issuerSKIDSeqSz);
idx += issuerSKIDSeqSz;
XMEMCPY(recip->recip + idx, issuerSKID, issuerSKIDSz);
idx += issuerSKIDSz;
XMEMCPY(recip->recip + idx, pkcs7->issuerSubjKeyId, KEYID_SIZE);
idx += KEYID_SIZE;
}
XMEMCPY(recip->recip + idx, keyAlgArray, keyEncAlgSz);
idx += keyEncAlgSz;
XMEMCPY(recip->recip + idx, encKeyOctetStr, encKeyOctetStrSz);
idx += encKeyOctetStrSz;
XMEMCPY(recip->recip + idx, encryptedKey, encryptedKeySz);
idx += encryptedKeySz;
FreeDecodedCert(decoded);
#ifdef WOLFSSL_SMALL_STACK
XFREE(serial, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(keyAlgArray, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(decoded, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
/* store recipient size */
recip->recipSz = idx;
recip->recipType = PKCS7_KTRI;
/* add recipient to recip list */
if (pkcs7->recipList == NULL) {
pkcs7->recipList = recip;
} else {
lastRecip = pkcs7->recipList;
while (lastRecip->next != NULL) {
lastRecip = lastRecip->next;
}
lastRecip->next = recip;
}
return idx;
}
#endif /* !NO_RSA */
/* encrypt content using encryptOID algo */
static int wc_PKCS7_EncryptContent(int encryptOID, byte* key, int keySz,
byte* iv, int ivSz, byte* aad, word32 aadSz,
byte* authTag, word32 authTagSz, byte* in,
int inSz, byte* out)
{
int ret;
#ifndef NO_AES
Aes aes;
#endif
#ifndef NO_DES3
Des des;
Des3 des3;
#endif
if (key == NULL || iv == NULL || in == NULL || out == NULL)
return BAD_FUNC_ARG;
switch (encryptOID) {
#ifndef NO_AES
#ifdef WOLFSSL_AES_128
case AES128CBCb:
#endif
#ifdef WOLFSSL_AES_192
case AES192CBCb:
#endif
#ifdef WOLFSSL_AES_256
case AES256CBCb:
#endif
if (
#ifdef WOLFSSL_AES_128
(encryptOID == AES128CBCb && keySz != 16 ) ||
#endif
#ifdef WOLFSSL_AES_192
(encryptOID == AES192CBCb && keySz != 24 ) ||
#endif
#ifdef WOLFSSL_AES_256
(encryptOID == AES256CBCb && keySz != 32 ) ||
#endif
(ivSz != AES_BLOCK_SIZE) )
return BAD_FUNC_ARG;
ret = wc_AesInit(&aes, NULL, INVALID_DEVID);
if (ret == 0) {
ret = wc_AesSetKey(&aes, key, keySz, iv, AES_ENCRYPTION);
if (ret == 0)
ret = wc_AesCbcEncrypt(&aes, out, in, inSz);
wc_AesFree(&aes);
}
break;
#ifdef HAVE_AESGCM
#ifdef WOLFSSL_AES_128
case AES128GCMb:
#endif
#ifdef WOLFSSL_AES_192
case AES192GCMb:
#endif
#ifdef WOLFSSL_AES_256
case AES256GCMb:
#endif
#if defined(WOLFSSL_AES_128) || defined(WOLFSSL_AES_192) || \
defined(WOLFSSL_AES_256)
if (authTag == NULL)
return BAD_FUNC_ARG;
ret = wc_AesInit(&aes, NULL, INVALID_DEVID);
if (ret == 0) {
ret = wc_AesGcmSetKey(&aes, key, keySz);
if (ret == 0)
ret = wc_AesGcmEncrypt(&aes, out, in, inSz, iv, ivSz,
authTag, authTagSz, aad, aadSz);
wc_AesFree(&aes);
}
break;
#endif
#endif /* HAVE_AESGCM */
#ifdef HAVE_AESCCM
#ifdef WOLFSSL_AES_128
case AES128CCMb:
#endif
#ifdef WOLFSSL_AES_192
case AES192CCMb:
#endif
#ifdef WOLFSSL_AES_256
case AES256CCMb:
#endif
#if defined(WOLFSSL_AES_128) || defined(WOLFSSL_AES_192) || \
defined(WOLFSSL_AES_256)
if (authTag == NULL)
return BAD_FUNC_ARG;
ret = wc_AesInit(&aes, NULL, INVALID_DEVID);
if (ret == 0) {
ret = wc_AesCcmSetKey(&aes, key, keySz);
if (ret == 0)
ret = wc_AesCcmEncrypt(&aes, out, in, inSz, iv, ivSz,
authTag, authTagSz, aad, aadSz);
wc_AesFree(&aes);
}
break;
#endif
#endif /* HAVE_AESCCM */
#endif /* NO_AES */
#ifndef NO_DES3
case DESb:
if (keySz != DES_KEYLEN || ivSz != DES_BLOCK_SIZE)
return BAD_FUNC_ARG;
ret = wc_Des_SetKey(&des, key, iv, DES_ENCRYPTION);
if (ret == 0)
ret = wc_Des_CbcEncrypt(&des, out, in, inSz);
break;
case DES3b:
if (keySz != DES3_KEYLEN || ivSz != DES_BLOCK_SIZE)
return BAD_FUNC_ARG;
ret = wc_Des3Init(&des3, NULL, INVALID_DEVID);
if (ret == 0) {
ret = wc_Des3_SetKey(&des3, key, iv, DES_ENCRYPTION);
if (ret == 0)
ret = wc_Des3_CbcEncrypt(&des3, out, in, inSz);
wc_Des3Free(&des3);
}
break;
#endif
default:
WOLFSSL_MSG("Unsupported content cipher type");
return ALGO_ID_E;
};
#if defined(NO_AES) || (!defined(HAVE_AESGCM) && !defined(HAVE_AESCCM))
(void)authTag;
(void)authTagSz;
(void)aad;
(void)aadSz;
#endif
return ret;
}
/* decrypt content using encryptOID algo */
static int wc_PKCS7_DecryptContent(int encryptOID, byte* key, int keySz,
byte* iv, int ivSz, byte* aad, word32 aadSz,
byte* authTag, word32 authTagSz, byte* in,
int inSz, byte* out)
{
int ret;
#ifndef NO_AES
Aes aes;
#endif
#ifndef NO_DES3
Des des;
Des3 des3;
#endif
if (key == NULL || iv == NULL || in == NULL || out == NULL)
return BAD_FUNC_ARG;
switch (encryptOID) {
#ifndef NO_AES
#ifdef WOLFSSL_AES_128
case AES128CBCb:
#endif
#ifdef WOLFSSL_AES_192
case AES192CBCb:
#endif
#ifdef WOLFSSL_AES_256
case AES256CBCb:
#endif
if (
#ifdef WOLFSSL_AES_128
(encryptOID == AES128CBCb && keySz != 16 ) ||
#endif
#ifdef WOLFSSL_AES_192
(encryptOID == AES192CBCb && keySz != 24 ) ||
#endif
#ifdef WOLFSSL_AES_256
(encryptOID == AES256CBCb && keySz != 32 ) ||
#endif
(ivSz != AES_BLOCK_SIZE) )
return BAD_FUNC_ARG;
ret = wc_AesInit(&aes, NULL, INVALID_DEVID);
if (ret == 0) {
ret = wc_AesSetKey(&aes, key, keySz, iv, AES_DECRYPTION);
if (ret == 0)
ret = wc_AesCbcDecrypt(&aes, out, in, inSz);
wc_AesFree(&aes);
}
break;
#ifdef HAVE_AESGCM
#ifdef WOLFSSL_AES_128
case AES128GCMb:
#endif
#ifdef WOLFSSL_AES_192
case AES192GCMb:
#endif
#ifdef WOLFSSL_AES_256
case AES256GCMb:
#endif
#if defined(WOLFSSL_AES_128) || defined(WOLFSSL_AES_192) || \
defined(WOLFSSL_AES_256)
if (authTag == NULL)
return BAD_FUNC_ARG;
ret = wc_AesInit(&aes, NULL, INVALID_DEVID);
if (ret == 0) {
ret = wc_AesGcmSetKey(&aes, key, keySz);
if (ret == 0)
ret = wc_AesGcmDecrypt(&aes, out, in, inSz, iv, ivSz,
authTag, authTagSz, aad, aadSz);
wc_AesFree(&aes);
}
break;
#endif
#endif /* HAVE_AESGCM */
#ifdef HAVE_AESCCM
#ifdef WOLFSSL_AES_128
case AES128CCMb:
#endif
#ifdef WOLFSSL_AES_192
case AES192CCMb:
#endif
#ifdef WOLFSSL_AES_256
case AES256CCMb:
#endif
#if defined(WOLFSSL_AES_128) || defined(WOLFSSL_AES_192) || \
defined(WOLFSSL_AES_256)
if (authTag == NULL)
return BAD_FUNC_ARG;
ret = wc_AesInit(&aes, NULL, INVALID_DEVID);
if (ret == 0) {
ret = wc_AesCcmSetKey(&aes, key, keySz);
if (ret == 0)
ret = wc_AesCcmDecrypt(&aes, out, in, inSz, iv, ivSz,
authTag, authTagSz, aad, aadSz);
wc_AesFree(&aes);
}
break;
#endif
#endif /* HAVE_AESCCM */
#endif /* NO_AES */
#ifndef NO_DES3
case DESb:
if (keySz != DES_KEYLEN || ivSz != DES_BLOCK_SIZE)
return BAD_FUNC_ARG;
ret = wc_Des_SetKey(&des, key, iv, DES_DECRYPTION);
if (ret == 0)
ret = wc_Des_CbcDecrypt(&des, out, in, inSz);
break;
case DES3b:
if (keySz != DES3_KEYLEN || ivSz != DES_BLOCK_SIZE)
return BAD_FUNC_ARG;
ret = wc_Des3Init(&des3, NULL, INVALID_DEVID);
if (ret == 0) {
ret = wc_Des3_SetKey(&des3, key, iv, DES_DECRYPTION);
if (ret == 0)
ret = wc_Des3_CbcDecrypt(&des3, out, in, inSz);
wc_Des3Free(&des3);
}
break;
#endif
default:
WOLFSSL_MSG("Unsupported content cipher type");
return ALGO_ID_E;
};
#if defined(NO_AES) || (!defined(HAVE_AESGCM) && !defined(HAVE_AESCCM))
(void)authTag;
(void)authTagSz;
(void)aad;
(void)aadSz;
#endif
return ret;
}
/* Generate random block, place in out, return 0 on success negative on error.
* Used for generation of IV, nonce, etc */
static int wc_PKCS7_GenerateBlock(PKCS7* pkcs7, WC_RNG* rng, byte* out,
word32 outSz)
{
int ret;
WC_RNG* rnd = NULL;
if (out == NULL || outSz == 0)
return BAD_FUNC_ARG;
/* input RNG is optional, init local one if input rng is NULL */
if (rng == NULL) {
rnd = (WC_RNG*)XMALLOC(sizeof(WC_RNG), pkcs7->heap, DYNAMIC_TYPE_RNG);
if (rnd == NULL)
return MEMORY_E;
ret = wc_InitRng_ex(rnd, pkcs7->heap, pkcs7->devId);
if (ret != 0) {
XFREE(rnd, pkcs7->heap, DYNAMIC_TYPE_RNG);
return ret;
}
} else {
rnd = rng;
}
ret = wc_RNG_GenerateBlock(rnd, out, outSz);
if (rng == NULL) {
wc_FreeRng(rnd);
XFREE(rnd, pkcs7->heap, DYNAMIC_TYPE_RNG);
}
return ret;
}
/* Set default SignerIdentifier type to be used. Is either
* IssuerAndSerialNumber or SubjectKeyIdentifier. Encoding defaults to using
* IssuerAndSerialNumber unless set with this function or explicitly
* overriden via options when adding RecipientInfo type.
*
* pkcs7 - pointer to initialized PKCS7 structure
* type - either CMS_ISSUER_AND_SERIAL_NUMBER or CMS_SKID
*
* return 0 on success, negative upon error */
int wc_PKCS7_SetSignerIdentifierType(PKCS7* pkcs7, int type)
{
if (pkcs7 == NULL)
return BAD_FUNC_ARG;
if (type != CMS_ISSUER_AND_SERIAL_NUMBER &&
type != CMS_SKID) {
return BAD_FUNC_ARG;
}
pkcs7->sidType = type;
return 0;
}
/* Set custom contentType, currently supported with SignedData type
*
* pkcs7 - pointer to initialized PKCS7 structure
* contentType - pointer to array with ASN.1 encoded OID value
* sz - length of contentType array, octets
*
* return 0 on success, negative upon error */
int wc_PKCS7_SetContentType(PKCS7* pkcs7, byte* contentType, word32 sz)
{
if (pkcs7 == NULL || contentType == NULL || sz == 0)
return BAD_FUNC_ARG;
if (sz > MAX_OID_SZ) {
WOLFSSL_MSG("input array too large, bounded by MAX_OID_SZ");
return BAD_FUNC_ARG;
}
XMEMCPY(pkcs7->contentType, contentType, sz);
pkcs7->contentTypeSz = sz;
return 0;
}
/* return size of padded data, padded to blockSz chunks, or negative on error */
int wc_PKCS7_GetPadSize(word32 inputSz, word32 blockSz)
{
int padSz;
if (blockSz == 0)
return BAD_FUNC_ARG;
padSz = blockSz - (inputSz % blockSz);
return padSz;
}
/* pad input data to blockSz chunk, place in outSz. out must be big enough
* for input + pad bytes. See wc_PKCS7_GetPadSize() helper. */
int wc_PKCS7_PadData(byte* in, word32 inSz, byte* out, word32 outSz,
word32 blockSz)
{
int i, padSz;
if (in == NULL || inSz == 0 ||
out == NULL || outSz == 0)
return BAD_FUNC_ARG;
padSz = wc_PKCS7_GetPadSize(inSz, blockSz);
if (outSz < (inSz + padSz))
return BAD_FUNC_ARG;
XMEMCPY(out, in, inSz);
for (i = 0; i < padSz; i++) {
out[inSz + i] = (byte)padSz;
}
return inSz + padSz;
}
/* Encode and add CMS EnvelopedData ORI (OtherRecipientInfo) RecipientInfo
* to CMS/PKCS#7 EnvelopedData structure.
*
* Return 0 on success, negative upon error */
int wc_PKCS7_AddRecipient_ORI(PKCS7* pkcs7, CallbackOriEncrypt oriEncryptCb,
int options)
{
int oriTypeLenSz, blockKeySz, ret;
word32 idx, recipSeqSz;
Pkcs7EncodedRecip* recip = NULL;
Pkcs7EncodedRecip* lastRecip = NULL;
byte recipSeq[MAX_SEQ_SZ];
byte oriTypeLen[MAX_LENGTH_SZ];
byte oriType[MAX_ORI_TYPE_SZ];
byte oriValue[MAX_ORI_VALUE_SZ];
word32 oriTypeSz = MAX_ORI_TYPE_SZ;
word32 oriValueSz = MAX_ORI_VALUE_SZ;
if (pkcs7 == NULL || oriEncryptCb == NULL) {
return BAD_FUNC_ARG;
}
/* allocate memory for RecipientInfo, KEK, encrypted key */
recip = (Pkcs7EncodedRecip*)XMALLOC(sizeof(Pkcs7EncodedRecip),
pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (recip == NULL)
return MEMORY_E;
XMEMSET(recip, 0, sizeof(Pkcs7EncodedRecip));
/* get key size for content-encryption key based on algorithm */
blockKeySz = wc_PKCS7_GetOIDKeySize(pkcs7->encryptOID);
if (blockKeySz < 0) {
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return blockKeySz;
}
/* generate random content encryption key, if needed */
ret = PKCS7_GenerateContentEncryptionKey(pkcs7, blockKeySz);
if (ret < 0) {
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
/* call user callback to encrypt CEK and get oriType and oriValue
values back */
ret = oriEncryptCb(pkcs7, pkcs7->cek, pkcs7->cekSz, oriType, &oriTypeSz,
oriValue, &oriValueSz, pkcs7->oriEncryptCtx);
if (ret != 0) {
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
oriTypeLenSz = SetLength(oriTypeSz, oriTypeLen);
recipSeqSz = SetImplicit(ASN_SEQUENCE, 4, 1 + oriTypeLenSz + oriTypeSz +
oriValueSz, recipSeq);
idx = 0;
XMEMCPY(recip->recip + idx, recipSeq, recipSeqSz);
idx += recipSeqSz;
/* oriType */
recip->recip[idx] = ASN_OBJECT_ID;
idx += 1;
XMEMCPY(recip->recip + idx, oriTypeLen, oriTypeLenSz);
idx += oriTypeLenSz;
XMEMCPY(recip->recip + idx, oriType, oriTypeSz);
idx += oriTypeSz;
/* oriValue, input MUST already be ASN.1 encoded */
XMEMCPY(recip->recip + idx, oriValue, oriValueSz);
idx += oriValueSz;
/* store recipient size */
recip->recipSz = idx;
recip->recipType = PKCS7_ORI;
recip->recipVersion = 4;
/* add recipient to recip list */
if (pkcs7->recipList == NULL) {
pkcs7->recipList = recip;
} else {
lastRecip = pkcs7->recipList;
while (lastRecip->next != NULL) {
lastRecip = lastRecip->next;
}
lastRecip->next = recip;
}
(void)options;
return idx;
}
#if !defined(NO_PWDBASED) && !defined(NO_SHA)
static int wc_PKCS7_GenerateKEK_PWRI(PKCS7* pkcs7, byte* passwd, word32 pLen,
byte* salt, word32 saltSz, int kdfOID,
int prfOID, int iterations, byte* out,
word32 outSz)
{
int ret;
if (pkcs7 == NULL || passwd == NULL || salt == NULL || out == NULL)
return BAD_FUNC_ARG;
switch (kdfOID) {
case PBKDF2_OID:
ret = wc_PBKDF2(out, passwd, pLen, salt, saltSz, iterations,
outSz, prfOID);
if (ret != 0) {
return ret;
}
break;
default:
WOLFSSL_MSG("Unsupported KDF OID");
return PKCS7_OID_E;
}
return 0;
}
/* RFC3211 (Section 2.3.1) key wrap algorithm (id-alg-PWRI-KEK).
*
* Returns output size on success, negative upon error */
static int wc_PKCS7_PwriKek_KeyWrap(PKCS7* pkcs7, const byte* kek, word32 kekSz,
const byte* cek, word32 cekSz,
byte* out, word32 *outSz,
const byte* iv, word32 ivSz, int algID)
{
WC_RNG rng;
int blockSz, outLen, ret;
word32 padSz;
byte* lastBlock;
if (kek == NULL || cek == NULL || iv == NULL || outSz == NULL)
return BAD_FUNC_ARG;
/* get encryption algorithm block size */
blockSz = wc_PKCS7_GetOIDBlockSize(algID);
if (blockSz < 0)
return blockSz;
/* get pad bytes needed to block boundary */
padSz = blockSz - ((4 + cekSz) % blockSz);
outLen = 4 + cekSz + padSz;
/* must be at least two blocks long */
if (outLen < 2 * blockSz)
padSz += blockSz;
/* if user set out to NULL, give back required length */
if (out == NULL) {
*outSz = outLen;
return LENGTH_ONLY_E;
}
/* verify output buffer is large enough */
if (*outSz < (word32)outLen)
return BUFFER_E;
out[0] = cekSz;
out[1] = ~cek[0];
out[2] = ~cek[1];
out[3] = ~cek[2];
XMEMCPY(out + 4, cek, cekSz);
/* random padding of size padSz */
ret = wc_InitRng_ex(&rng, pkcs7->heap, pkcs7->devId);
if (ret != 0)
return ret;
ret = wc_RNG_GenerateBlock(&rng, out + 4 + cekSz, padSz);
if (ret == 0) {
/* encrypt, normal */
ret = wc_PKCS7_EncryptContent(algID, (byte*)kek, kekSz, (byte*)iv,
ivSz, NULL, 0, NULL, 0, out, outLen, out);
}
if (ret == 0) {
/* encrypt again, using last ciphertext block as IV */
lastBlock = out + (((outLen / blockSz) - 1) * blockSz);
ret = wc_PKCS7_EncryptContent(algID, (byte*)kek, kekSz, lastBlock,
blockSz, NULL, 0, NULL, 0, out,
outLen, out);
}
if (ret == 0) {
*outSz = outLen;
} else {
outLen = ret;
}
wc_FreeRng(&rng);
return outLen;
}
/* RFC3211 (Section 2.3.2) key unwrap algorithm (id-alg-PWRI-KEK).
*
* Returns cek size on success, negative upon error */
static int wc_PKCS7_PwriKek_KeyUnWrap(PKCS7* pkcs7, const byte* kek,
word32 kekSz, const byte* in, word32 inSz,
byte* out, word32 outSz, const byte* iv,
word32 ivSz, int algID)
{
int blockSz, cekLen, ret;
byte* tmpIv = NULL;
byte* lastBlock = NULL;
byte* outTmp = NULL;
if (pkcs7 == NULL || kek == NULL || in == NULL ||
out == NULL || iv == NULL) {
return BAD_FUNC_ARG;
}
outTmp = (byte*)XMALLOC(inSz, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
if (outTmp == NULL)
return MEMORY_E;
/* get encryption algorithm block size */
blockSz = wc_PKCS7_GetOIDBlockSize(algID);
if (blockSz < 0) {
XFREE(outTmp, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
return blockSz;
}
/* input needs to be blockSz multiple and at least 2 * blockSz */
if (((inSz % blockSz) != 0) || (inSz < (2 * (word32)blockSz))) {
WOLFSSL_MSG("PWRI-KEK unwrap input must of block size and >= 2 "
"times block size");
XFREE(outTmp, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
return BAD_FUNC_ARG;
}
/* use block out[n-1] as IV to decrypt block out[n] */
lastBlock = (byte*)in + inSz - blockSz;
tmpIv = lastBlock - blockSz;
/* decrypt last block */
ret = wc_PKCS7_DecryptContent(algID, (byte*)kek, kekSz, tmpIv, blockSz,
NULL, 0, NULL, 0, lastBlock, blockSz,
outTmp + inSz - blockSz);
if (ret == 0) {
/* using last decrypted block as IV, decrypt [0 ... n-1] blocks */
lastBlock = outTmp + inSz - blockSz;
ret = wc_PKCS7_DecryptContent(algID, (byte*)kek, kekSz, lastBlock,
blockSz, NULL, 0, NULL, 0, (byte*)in,
inSz - blockSz, outTmp);
}
if (ret == 0) {
/* decrypt using original kek and iv */
ret = wc_PKCS7_DecryptContent(algID, (byte*)kek, kekSz, (byte*)iv,
ivSz, NULL, 0, NULL, 0, outTmp, inSz,
outTmp);
}
if (ret != 0) {
ForceZero(outTmp, inSz);
XFREE(outTmp, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
return ret;
}
cekLen = outTmp[0];
/* verify length */
if ((word32)cekLen > inSz) {
ForceZero(outTmp, inSz);
XFREE(outTmp, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
return BAD_FUNC_ARG;
}
/* verify check bytes */
if ((outTmp[1] ^ outTmp[4]) != 0xFF ||
(outTmp[2] ^ outTmp[5]) != 0xFF ||
(outTmp[3] ^ outTmp[6]) != 0xFF) {
ForceZero(outTmp, inSz);
XFREE(outTmp, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
return BAD_FUNC_ARG;
}
if (outSz < (word32)cekLen) {
ForceZero(outTmp, inSz);
XFREE(outTmp, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
return BUFFER_E;
}
XMEMCPY(out, outTmp + 4, outTmp[0]);
ForceZero(outTmp, inSz);
XFREE(outTmp, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
return cekLen;
}
/* Encode and add CMS EnvelopedData PWRI (PasswordRecipientInfo) RecipientInfo
* to CMS/PKCS#7 EnvelopedData structure.
*
* Return 0 on success, negative upon error */
int wc_PKCS7_AddRecipient_PWRI(PKCS7* pkcs7, byte* passwd, word32 pLen,
byte* salt, word32 saltSz, int kdfOID,
int hashOID, int iterations, int kekEncryptOID,
int options)
{
Pkcs7EncodedRecip* recip = NULL;
Pkcs7EncodedRecip* lastRecip = NULL;
/* PasswordRecipientInfo */
byte recipSeq[MAX_SEQ_SZ];
byte ver[MAX_VERSION_SZ];
word32 recipSeqSz, verSz;
/* KeyDerivationAlgorithmIdentifier */
byte kdfAlgoIdSeq[MAX_SEQ_SZ];
byte kdfAlgoId[MAX_OID_SZ];
byte kdfParamsSeq[MAX_SEQ_SZ]; /* PBKDF2-params */
byte kdfSaltOctetStr[MAX_OCTET_STR_SZ]; /* salt OCTET STRING */
byte kdfIterations[MAX_VERSION_SZ];
word32 kdfAlgoIdSeqSz, kdfAlgoIdSz;
word32 kdfParamsSeqSz, kdfSaltOctetStrSz, kdfIterationsSz;
/* OPTIONAL: keyLength, not supported yet */
/* OPTIONAL: prf AlgorithIdentifier, not supported yet */
/* KeyEncryptionAlgorithmIdentifier */
byte keyEncAlgoIdSeq[MAX_SEQ_SZ];
byte keyEncAlgoId[MAX_OID_SZ]; /* id-alg-PWRI-KEK */
byte pwriEncAlgoId[MAX_ALGO_SZ];
byte ivOctetString[MAX_OCTET_STR_SZ];
word32 keyEncAlgoIdSeqSz, keyEncAlgoIdSz;
word32 pwriEncAlgoIdSz, ivOctetStringSz;
/* EncryptedKey */
byte encKeyOctetStr[MAX_OCTET_STR_SZ];
word32 encKeyOctetStrSz;
byte tmpIv[MAX_CONTENT_IV_SIZE];
byte* encryptedKey = NULL;
byte* kek = NULL;
int cekKeySz = 0, kekKeySz = 0, kekBlockSz = 0, ret = 0;
int encryptOID;
word32 idx, totalSz = 0, encryptedKeySz;
if (pkcs7 == NULL || passwd == NULL || pLen == 0 ||
salt == NULL || saltSz == 0) {
return BAD_FUNC_ARG;
}
/* allow user to use different KEK encryption algorithm than used for
* main content encryption algorithm, if passed in */
if (kekEncryptOID != 0) {
encryptOID = kekEncryptOID;
} else {
encryptOID = pkcs7->encryptOID;
}
/* get content-encryption key size, based on algorithm */
cekKeySz = wc_PKCS7_GetOIDKeySize(pkcs7->encryptOID);
if (cekKeySz < 0)
return cekKeySz;
/* get KEK encryption key size, based on algorithm */
if (encryptOID != pkcs7->encryptOID) {
kekKeySz = wc_PKCS7_GetOIDKeySize(encryptOID);
} else {
kekKeySz = cekKeySz;
}
/* get KEK encryption block size */
kekBlockSz = wc_PKCS7_GetOIDBlockSize(encryptOID);
if (kekBlockSz < 0)
return kekBlockSz;
/* generate random CEK */
ret = PKCS7_GenerateContentEncryptionKey(pkcs7, cekKeySz);
if (ret < 0)
return ret;
/* generate random IV */
ret = wc_PKCS7_GenerateBlock(pkcs7, NULL, tmpIv, kekBlockSz);
if (ret != 0)
return ret;
/* allocate memory for RecipientInfo, KEK, encrypted key */
recip = (Pkcs7EncodedRecip*)XMALLOC(sizeof(Pkcs7EncodedRecip),
pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (recip == NULL)
return MEMORY_E;
kek = (byte*)XMALLOC(kekKeySz, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (kek == NULL) {
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return MEMORY_E;
}
encryptedKey = (byte*)XMALLOC(MAX_ENCRYPTED_KEY_SZ,
pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (encryptedKey == NULL) {
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(kek, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return MEMORY_E;
}
encryptedKeySz = MAX_ENCRYPTED_KEY_SZ;
XMEMSET(recip, 0, sizeof(Pkcs7EncodedRecip));
XMEMSET(kek, 0, kekKeySz);
XMEMSET(encryptedKey, 0, encryptedKeySz);
/* generate KEK: expand password into KEK */
ret = wc_PKCS7_GenerateKEK_PWRI(pkcs7, passwd, pLen, salt, saltSz,
kdfOID, hashOID, iterations, kek,
kekKeySz);
if (ret < 0) {
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(kek, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
/* generate encrypted key: encrypt CEK with KEK */
ret = wc_PKCS7_PwriKek_KeyWrap(pkcs7, kek, kekKeySz, pkcs7->cek,
pkcs7->cekSz, encryptedKey, &encryptedKeySz,
tmpIv, kekBlockSz, encryptOID);
if (ret < 0) {
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(kek, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
encryptedKeySz = ret;
/* put together encrypted key OCTET STRING */
encKeyOctetStrSz = SetOctetString(encryptedKeySz, encKeyOctetStr);
totalSz += (encKeyOctetStrSz + encryptedKeySz);
/* put together IV OCTET STRING */
ivOctetStringSz = SetOctetString(kekBlockSz, ivOctetString);
totalSz += (ivOctetStringSz + kekBlockSz);
/* set PWRIAlgorithms AlgorithmIdentifier, adding (ivOctetStringSz +
blockKeySz) for IV OCTET STRING */
pwriEncAlgoIdSz = SetAlgoID(encryptOID, pwriEncAlgoId,
oidBlkType, ivOctetStringSz + kekBlockSz);
totalSz += pwriEncAlgoIdSz;
/* set KeyEncryptionAlgorithms OID */
ret = wc_SetContentType(PWRI_KEK_WRAP, keyEncAlgoId, sizeof(keyEncAlgoId));
if (ret <= 0) {
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(kek, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
keyEncAlgoIdSz = ret;
totalSz += keyEncAlgoIdSz;
/* KeyEncryptionAlgorithm SEQ */
keyEncAlgoIdSeqSz = SetSequence(keyEncAlgoIdSz + pwriEncAlgoIdSz +
ivOctetStringSz + kekBlockSz,
keyEncAlgoIdSeq);
totalSz += keyEncAlgoIdSeqSz;
/* set KDF salt */
kdfSaltOctetStrSz = SetOctetString(saltSz, kdfSaltOctetStr);
totalSz += (kdfSaltOctetStrSz + saltSz);
/* set KDF iteration count */
kdfIterationsSz = SetMyVersion(iterations, kdfIterations, 0);
totalSz += kdfIterationsSz;
/* set KDF params SEQ */
kdfParamsSeqSz = SetSequence(kdfSaltOctetStrSz + saltSz + kdfIterationsSz,
kdfParamsSeq);
totalSz += kdfParamsSeqSz;
/* set KDF algo OID */
ret = wc_SetContentType(kdfOID, kdfAlgoId, sizeof(kdfAlgoId));
if (ret <= 0) {
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(kek, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
kdfAlgoIdSz = ret;
totalSz += kdfAlgoIdSz;
/* set KeyDerivationAlgorithmIdentifier EXPLICIT [0] SEQ */
kdfAlgoIdSeqSz = SetExplicit(0, kdfAlgoIdSz + kdfParamsSeqSz +
kdfSaltOctetStrSz + saltSz + kdfIterationsSz,
kdfAlgoIdSeq);
totalSz += kdfAlgoIdSeqSz;
/* set PasswordRecipientInfo CMSVersion, MUST be 0 */
verSz = SetMyVersion(0, ver, 0);
totalSz += verSz;
recip->recipVersion = 0;
/* set PasswordRecipientInfo SEQ */
recipSeqSz = SetImplicit(ASN_SEQUENCE, 3, totalSz, recipSeq);
totalSz += recipSeqSz;
if (totalSz > MAX_RECIP_SZ) {
WOLFSSL_MSG("CMS Recipient output buffer too small");
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(kek, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return BUFFER_E;
}
idx = 0;
XMEMCPY(recip->recip + idx, recipSeq, recipSeqSz);
idx += recipSeqSz;
XMEMCPY(recip->recip + idx, ver, verSz);
idx += verSz;
XMEMCPY(recip->recip + idx, kdfAlgoIdSeq, kdfAlgoIdSeqSz);
idx += kdfAlgoIdSeqSz;
XMEMCPY(recip->recip + idx, kdfAlgoId, kdfAlgoIdSz);
idx += kdfAlgoIdSz;
XMEMCPY(recip->recip + idx, kdfParamsSeq, kdfParamsSeqSz);
idx += kdfParamsSeqSz;
XMEMCPY(recip->recip + idx, kdfSaltOctetStr, kdfSaltOctetStrSz);
idx += kdfSaltOctetStrSz;
XMEMCPY(recip->recip + idx, salt, saltSz);
idx += saltSz;
XMEMCPY(recip->recip + idx, kdfIterations, kdfIterationsSz);
idx += kdfIterationsSz;
XMEMCPY(recip->recip + idx, keyEncAlgoIdSeq, keyEncAlgoIdSeqSz);
idx += keyEncAlgoIdSeqSz;
XMEMCPY(recip->recip + idx, keyEncAlgoId, keyEncAlgoIdSz);
idx += keyEncAlgoIdSz;
XMEMCPY(recip->recip + idx, pwriEncAlgoId, pwriEncAlgoIdSz);
idx += pwriEncAlgoIdSz;
XMEMCPY(recip->recip + idx, ivOctetString, ivOctetStringSz);
idx += ivOctetStringSz;
XMEMCPY(recip->recip + idx, tmpIv, kekBlockSz);
idx += kekBlockSz;
XMEMCPY(recip->recip + idx, encKeyOctetStr, encKeyOctetStrSz);
idx += encKeyOctetStrSz;
XMEMCPY(recip->recip + idx, encryptedKey, encryptedKeySz);
idx += encryptedKeySz;
ForceZero(kek, kekBlockSz);
ForceZero(encryptedKey, encryptedKeySz);
XFREE(kek, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
/* store recipient size */
recip->recipSz = idx;
recip->recipType = PKCS7_PWRI;
/* add recipient to recip list */
if (pkcs7->recipList == NULL) {
pkcs7->recipList = recip;
} else {
lastRecip = pkcs7->recipList;
while (lastRecip->next != NULL) {
lastRecip = lastRecip->next;
}
lastRecip->next = recip;
}
(void)options;
return idx;
}
/* Import password and KDF settings into a PKCS7 structure. Used for setting
* the password info for decryption a EnvelopedData PWRI RecipientInfo.
*
* Returns 0 on success, negative upon error */
int wc_PKCS7_SetPassword(PKCS7* pkcs7, byte* passwd, word32 pLen)
{
if (pkcs7 == NULL || passwd == NULL || pLen == 0)
return BAD_FUNC_ARG;
pkcs7->pass = passwd;
pkcs7->passSz = pLen;
return 0;
}
#endif /* NO_PWDBASED */
/* Encode and add CMS EnvelopedData KEKRI (KEKRecipientInfo) RecipientInfo
* to CMS/PKCS#7 EnvelopedData structure.
*
* pkcs7 - pointer to initialized PKCS7 structure
* keyWrapOID - OID sum of key wrap algorithm identifier
* kek - key encryption key
* kekSz - size of kek, bytes
* keyID - key-encryption key identifier, pre-distributed to endpoints
* keyIDSz - size of keyID, bytes
* timePtr - pointer to "time_t", which is typically "long" (OPTIONAL)
* otherOID - ASN.1 encoded OID of other attribute (OPTIONAL)
* otherOIDSz - size of otherOID, bytes (OPTIONAL)
* other - other attribute (OPTIONAL)
* otherSz - size of other (OPTIONAL)
*
* Returns 0 on success, negative upon error */
int wc_PKCS7_AddRecipient_KEKRI(PKCS7* pkcs7, int keyWrapOID, byte* kek,
word32 kekSz, byte* keyId, word32 keyIdSz,
void* timePtr, byte* otherOID,
word32 otherOIDSz, byte* other, word32 otherSz,
int options)
{
Pkcs7EncodedRecip* recip = NULL;
Pkcs7EncodedRecip* lastRecip = NULL;
byte recipSeq[MAX_SEQ_SZ];
byte ver[MAX_VERSION_SZ];
byte kekIdSeq[MAX_SEQ_SZ];
byte kekIdOctetStr[MAX_OCTET_STR_SZ];
byte genTime[ASN_GENERALIZED_TIME_SIZE];
byte otherAttSeq[MAX_SEQ_SZ];
byte encAlgoId[MAX_ALGO_SZ];
byte encKeyOctetStr[MAX_OCTET_STR_SZ];
#ifdef WOLFSSL_SMALL_STACK
byte* encryptedKey;
#else
byte encryptedKey[MAX_ENCRYPTED_KEY_SZ];
#endif
int blockKeySz = 0, ret = 0, direction;
word32 idx = 0;
word32 totalSz = 0;
word32 recipSeqSz = 0, verSz = 0;
word32 kekIdSeqSz = 0, kekIdOctetStrSz = 0;
word32 otherAttSeqSz = 0, encAlgoIdSz = 0, encKeyOctetStrSz = 0;
int encryptedKeySz;
int timeSz = 0;
#ifndef NO_ASN_TIME
time_t* tm = NULL;
#endif
if (pkcs7 == NULL || kek == NULL || keyId == NULL)
return BAD_FUNC_ARG;
recip = (Pkcs7EncodedRecip*)XMALLOC(sizeof(Pkcs7EncodedRecip), pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (recip == NULL)
return MEMORY_E;
XMEMSET(recip, 0, sizeof(Pkcs7EncodedRecip));
/* get key size for content-encryption key based on algorithm */
blockKeySz = wc_PKCS7_GetOIDKeySize(pkcs7->encryptOID);
if (blockKeySz < 0) {
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return blockKeySz;
}
/* generate random content encryption key, if needed */
ret = PKCS7_GenerateContentEncryptionKey(pkcs7, blockKeySz);
if (ret < 0) {
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
/* EncryptedKey */
#ifdef WOLFSSL_SMALL_STACK
encryptedKey = (byte*)XMALLOC(MAX_ENCRYPTED_KEY_SZ, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (encryptedKey == NULL) {
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return MEMORY_E;
}
#endif
encryptedKeySz = MAX_ENCRYPTED_KEY_SZ;
XMEMSET(encryptedKey, 0, encryptedKeySz);
#ifndef NO_AES
direction = AES_ENCRYPTION;
#else
direction = DES_ENCRYPTION;
#endif
encryptedKeySz = wc_PKCS7_KeyWrap(pkcs7->cek, pkcs7->cekSz, kek, kekSz,
encryptedKey, encryptedKeySz, keyWrapOID,
direction);
if (encryptedKeySz < 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return encryptedKeySz;
}
/* handle a zero size encKey case as WC_KEY_SIZE_E */
if (encryptedKeySz == 0 || encryptedKeySz > MAX_ENCRYPTED_KEY_SZ) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#endif
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return WC_KEY_SIZE_E;
}
encKeyOctetStrSz = SetOctetString(encryptedKeySz, encKeyOctetStr);
totalSz += (encKeyOctetStrSz + encryptedKeySz);
/* KeyEncryptionAlgorithmIdentifier */
encAlgoIdSz = SetAlgoID(keyWrapOID, encAlgoId, oidKeyWrapType, 0);
totalSz += encAlgoIdSz;
/* KEKIdentifier: keyIdentifier */
kekIdOctetStrSz = SetOctetString(keyIdSz, kekIdOctetStr);
totalSz += (kekIdOctetStrSz + keyIdSz);
/* KEKIdentifier: GeneralizedTime (OPTIONAL) */
#ifndef NO_ASN_TIME
if (timePtr != NULL) {
tm = (time_t*)timePtr;
timeSz = GetAsnTimeString(tm, genTime, sizeof(genTime));
if (timeSz < 0) {
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#endif
return timeSz;
}
totalSz += timeSz;
}
#endif
/* KEKIdentifier: OtherKeyAttribute SEQ (OPTIONAL) */
if (other != NULL && otherSz > 0) {
otherAttSeqSz = SetSequence(otherOIDSz + otherSz, otherAttSeq);
totalSz += otherAttSeqSz + otherOIDSz + otherSz;
}
/* KEKIdentifier SEQ */
kekIdSeqSz = SetSequence(kekIdOctetStrSz + keyIdSz + timeSz +
otherAttSeqSz + otherOIDSz + otherSz, kekIdSeq);
totalSz += kekIdSeqSz;
/* version */
verSz = SetMyVersion(4, ver, 0);
totalSz += verSz;
recip->recipVersion = 4;
/* KEKRecipientInfo SEQ */
recipSeqSz = SetImplicit(ASN_SEQUENCE, 2, totalSz, recipSeq);
totalSz += recipSeqSz;
if (totalSz > MAX_RECIP_SZ) {
WOLFSSL_MSG("CMS Recipient output buffer too small");
XFREE(recip, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#endif
return BUFFER_E;
}
XMEMCPY(recip->recip + idx, recipSeq, recipSeqSz);
idx += recipSeqSz;
XMEMCPY(recip->recip + idx, ver, verSz);
idx += verSz;
XMEMCPY(recip->recip + idx, kekIdSeq, kekIdSeqSz);
idx += kekIdSeqSz;
XMEMCPY(recip->recip + idx, kekIdOctetStr, kekIdOctetStrSz);
idx += kekIdOctetStrSz;
XMEMCPY(recip->recip + idx, keyId, keyIdSz);
idx += keyIdSz;
if (timePtr != NULL) {
XMEMCPY(recip->recip + idx, genTime, timeSz);
idx += timeSz;
}
if (other != NULL && otherSz > 0) {
XMEMCPY(recip->recip + idx, otherAttSeq, otherAttSeqSz);
idx += otherAttSeqSz;
XMEMCPY(recip->recip + idx, otherOID, otherOIDSz);
idx += otherOIDSz;
XMEMCPY(recip->recip + idx, other, otherSz);
idx += otherSz;
}
XMEMCPY(recip->recip + idx, encAlgoId, encAlgoIdSz);
idx += encAlgoIdSz;
XMEMCPY(recip->recip + idx, encKeyOctetStr, encKeyOctetStrSz);
idx += encKeyOctetStrSz;
XMEMCPY(recip->recip + idx, encryptedKey, encryptedKeySz);
idx += encryptedKeySz;
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#endif
/* store recipient size */
recip->recipSz = idx;
recip->recipType = PKCS7_KEKRI;
/* add recipient to recip list */
if (pkcs7->recipList == NULL) {
pkcs7->recipList = recip;
} else {
lastRecip = pkcs7->recipList;
while(lastRecip->next != NULL) {
lastRecip = lastRecip->next;
}
lastRecip->next = recip;
}
(void)options;
return idx;
}
static int wc_PKCS7_GetCMSVersion(PKCS7* pkcs7, int cmsContentType)
{
int version = -1;
if (pkcs7 == NULL)
return BAD_FUNC_ARG;
switch (cmsContentType) {
case ENVELOPED_DATA:
/* NOTE: EnvelopedData does not currently support
originatorInfo or unprotectedAttributes. When either of these
are added, version checking below needs to be updated to match
Section 6.1 of RFC 5652 */
/* if RecipientInfos include pwri or ori, version is 3 */
if (wc_PKCS7_RecipientListIncludesType(pkcs7, PKCS7_PWRI) ||
wc_PKCS7_RecipientListIncludesType(pkcs7, PKCS7_ORI)) {
version = 3;
break;
}
/* if unprotectedAttrs is absent AND all RecipientInfo structs
are version 0, version is 0 */
if (wc_PKCS7_RecipientListVersionsAllZero(pkcs7)) {
version = 0;
break;
}
/* otherwise, version is 2 */
version = 2;
break;
default:
break;
}
return version;
}
/* build PKCS#7 envelopedData content type, return enveloped size */
int wc_PKCS7_EncodeEnvelopedData(PKCS7* pkcs7, byte* output, word32 outputSz)
{
int ret, idx = 0;
int totalSz, padSz, encryptedOutSz;
int contentInfoSeqSz, outerContentTypeSz, outerContentSz;
byte contentInfoSeq[MAX_SEQ_SZ];
byte outerContentType[MAX_ALGO_SZ];
byte outerContent[MAX_SEQ_SZ];
int kariVersion;
int envDataSeqSz, verSz;
byte envDataSeq[MAX_SEQ_SZ];
byte ver[MAX_VERSION_SZ];
WC_RNG rng;
int blockSz, blockKeySz;
byte* plain;
byte* encryptedContent;
Pkcs7EncodedRecip* tmpRecip = NULL;
int recipSz, recipSetSz;
byte recipSet[MAX_SET_SZ];
int encContentOctetSz, encContentSeqSz, contentTypeSz;
int contentEncAlgoSz, ivOctetStringSz;
byte encContentSeq[MAX_SEQ_SZ];
byte contentType[MAX_ALGO_SZ];
byte contentEncAlgo[MAX_ALGO_SZ];
byte tmpIv[MAX_CONTENT_IV_SIZE];
byte ivOctetString[MAX_OCTET_STR_SZ];
byte encContentOctet[MAX_OCTET_STR_SZ];
if (pkcs7 == NULL || pkcs7->content == NULL || pkcs7->contentSz == 0)
return BAD_FUNC_ARG;
if (output == NULL || outputSz == 0)
return BAD_FUNC_ARG;
blockKeySz = wc_PKCS7_GetOIDKeySize(pkcs7->encryptOID);
if (blockKeySz < 0)
return blockKeySz;
blockSz = wc_PKCS7_GetOIDBlockSize(pkcs7->encryptOID);
if (blockSz < 0)
return blockSz;
/* outer content type */
ret = wc_SetContentType(ENVELOPED_DATA, outerContentType,
sizeof(outerContentType));
if (ret < 0)
return ret;
outerContentTypeSz = ret;
/* generate random content encryption key */
ret = PKCS7_GenerateContentEncryptionKey(pkcs7, blockKeySz);
if (ret != 0) {
return ret;
}
/* build RecipientInfo, only if user manually set singleCert and size */
if (pkcs7->singleCert != NULL && pkcs7->singleCertSz > 0) {
switch (pkcs7->publicKeyOID) {
#ifndef NO_RSA
case RSAk:
ret = wc_PKCS7_AddRecipient_KTRI(pkcs7, pkcs7->singleCert,
pkcs7->singleCertSz, 0);
break;
#endif
#ifdef HAVE_ECC
case ECDSAk:
ret = wc_PKCS7_AddRecipient_KARI(pkcs7, pkcs7->singleCert,
pkcs7->singleCertSz,
pkcs7->keyWrapOID,
pkcs7->keyAgreeOID, pkcs7->ukm,
pkcs7->ukmSz, 0);
break;
#endif
default:
WOLFSSL_MSG("Unsupported RecipientInfo public key type");
return BAD_FUNC_ARG;
};
if (ret < 0) {
WOLFSSL_MSG("Failed to create RecipientInfo");
return ret;
}
}
recipSz = wc_PKCS7_GetRecipientListSize(pkcs7);
if (recipSz < 0) {
return ret;
} else if (recipSz == 0) {
WOLFSSL_MSG("You must add at least one CMS recipient");
return PKCS7_RECIP_E;
}
recipSetSz = SetSet(recipSz, recipSet);
/* version, defined in Section 6.1 of RFC 5652 */
kariVersion = wc_PKCS7_GetCMSVersion(pkcs7, ENVELOPED_DATA);
if (kariVersion < 0) {
WOLFSSL_MSG("Failed to set CMS EnvelopedData version");
return PKCS7_RECIP_E;
}
verSz = SetMyVersion(kariVersion, ver, 0);
ret = wc_InitRng_ex(&rng, pkcs7->heap, pkcs7->devId);
if (ret != 0)
return ret;
/* generate IV for block cipher */
ret = wc_PKCS7_GenerateBlock(pkcs7, &rng, tmpIv, blockSz);
wc_FreeRng(&rng);
if (ret != 0)
return ret;
/* EncryptedContentInfo */
ret = wc_SetContentType(pkcs7->contentOID, contentType,
sizeof(contentType));
if (ret < 0)
return ret;
contentTypeSz = ret;
/* allocate encrypted content buffer and PKCS#7 padding */
padSz = wc_PKCS7_GetPadSize(pkcs7->contentSz, blockSz);
if (padSz < 0)
return padSz;
encryptedOutSz = pkcs7->contentSz + padSz;
plain = (byte*)XMALLOC(encryptedOutSz, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (plain == NULL)
return MEMORY_E;
ret = wc_PKCS7_PadData(pkcs7->content, pkcs7->contentSz, plain,
encryptedOutSz, blockSz);
if (ret < 0) {
XFREE(plain, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
encryptedContent = (byte*)XMALLOC(encryptedOutSz, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (encryptedContent == NULL) {
XFREE(plain, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return MEMORY_E;
}
/* put together IV OCTET STRING */
ivOctetStringSz = SetOctetString(blockSz, ivOctetString);
/* build up our ContentEncryptionAlgorithmIdentifier sequence,
* adding (ivOctetStringSz + blockSz) for IV OCTET STRING */
contentEncAlgoSz = SetAlgoID(pkcs7->encryptOID, contentEncAlgo,
oidBlkType, ivOctetStringSz + blockSz);
if (contentEncAlgoSz == 0) {
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(plain, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return BAD_FUNC_ARG;
}
/* encrypt content */
ret = wc_PKCS7_EncryptContent(pkcs7->encryptOID, pkcs7->cek,
pkcs7->cekSz, tmpIv, blockSz, NULL, 0, NULL, 0, plain,
encryptedOutSz, encryptedContent);
if (ret != 0) {
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(plain, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
encContentOctetSz = SetImplicit(ASN_OCTET_STRING, 0, encryptedOutSz,
encContentOctet);
encContentSeqSz = SetSequence(contentTypeSz + contentEncAlgoSz +
ivOctetStringSz + blockSz +
encContentOctetSz + encryptedOutSz,
encContentSeq);
/* keep track of sizes for outer wrapper layering */
totalSz = verSz + recipSetSz + recipSz + encContentSeqSz + contentTypeSz +
contentEncAlgoSz + ivOctetStringSz + blockSz +
encContentOctetSz + encryptedOutSz;
/* EnvelopedData */
envDataSeqSz = SetSequence(totalSz, envDataSeq);
totalSz += envDataSeqSz;
/* outer content */
outerContentSz = SetExplicit(0, totalSz, outerContent);
totalSz += outerContentTypeSz;
totalSz += outerContentSz;
/* ContentInfo */
contentInfoSeqSz = SetSequence(totalSz, contentInfoSeq);
totalSz += contentInfoSeqSz;
if (totalSz > (int)outputSz) {
WOLFSSL_MSG("Pkcs7_encrypt output buffer too small");
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(plain, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
return BUFFER_E;
}
XMEMCPY(output + idx, contentInfoSeq, contentInfoSeqSz);
idx += contentInfoSeqSz;
XMEMCPY(output + idx, outerContentType, outerContentTypeSz);
idx += outerContentTypeSz;
XMEMCPY(output + idx, outerContent, outerContentSz);
idx += outerContentSz;
XMEMCPY(output + idx, envDataSeq, envDataSeqSz);
idx += envDataSeqSz;
XMEMCPY(output + idx, ver, verSz);
idx += verSz;
XMEMCPY(output + idx, recipSet, recipSetSz);
idx += recipSetSz;
/* copy in recipients from list */
tmpRecip = pkcs7->recipList;
while (tmpRecip != NULL) {
XMEMCPY(output + idx, tmpRecip->recip, tmpRecip->recipSz);
idx += tmpRecip->recipSz;
tmpRecip = tmpRecip->next;
}
wc_PKCS7_FreeEncodedRecipientSet(pkcs7);
XMEMCPY(output + idx, encContentSeq, encContentSeqSz);
idx += encContentSeqSz;
XMEMCPY(output + idx, contentType, contentTypeSz);
idx += contentTypeSz;
XMEMCPY(output + idx, contentEncAlgo, contentEncAlgoSz);
idx += contentEncAlgoSz;
XMEMCPY(output + idx, ivOctetString, ivOctetStringSz);
idx += ivOctetStringSz;
XMEMCPY(output + idx, tmpIv, blockSz);
idx += blockSz;
XMEMCPY(output + idx, encContentOctet, encContentOctetSz);
idx += encContentOctetSz;
XMEMCPY(output + idx, encryptedContent, encryptedOutSz);
idx += encryptedOutSz;
XFREE(plain, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return idx;
}
#ifndef NO_RSA
/* decode KeyTransRecipientInfo (ktri), return 0 on success, <0 on error */
static int wc_PKCS7_DecryptKtri(PKCS7* pkcs7, byte* in, word32 inSz,
word32* idx, byte* decryptedKey,
word32* decryptedKeySz, int* recipFound)
{
int length, encryptedKeySz = 0, ret = 0;
int keySz, version, sidType = 0;
word32 encOID;
word32 keyIdx;
byte issuerHash[KEYID_SIZE];
byte* outKey = NULL;
byte* pkiMsg = in;
word32 pkiMsgSz = inSz;
#ifndef NO_PKCS7_STREAM
word32 tmpIdx = *idx;
long rc;
#endif
#ifdef WC_RSA_BLINDING
WC_RNG rng;
#endif
#ifdef WOLFSSL_SMALL_STACK
mp_int* serialNum = NULL;
byte* encryptedKey = NULL;
RsaKey* privKey = NULL;
#else
mp_int serialNum[1];
byte encryptedKey[MAX_ENCRYPTED_KEY_SZ];
RsaKey privKey[1];
#endif
switch (pkcs7->state) {
case WC_PKCS7_DECRYPT_KTRI:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz, MAX_VERSION_SZ,
&pkiMsg, idx)) != 0) {
return ret;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK,
in, inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
#endif
if (GetMyVersion(pkiMsg, idx, &version, pkiMsgSz) < 0)
return ASN_PARSE_E;
if (version == 0) {
sidType = CMS_ISSUER_AND_SERIAL_NUMBER;
} else if (version == 2) {
sidType = CMS_SKID;
} else {
return ASN_VERSION_E;
}
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, idx)) != 0) {
break;
}
wc_PKCS7_StreamStoreVar(pkcs7, 0, sidType, version);
/* @TODO getting total amount left because of GetInt call later on
* this could be optimized to stream better */
pkcs7->stream->expected = (pkcs7->stream->maxLen -
pkcs7->stream->totalRd) + pkcs7->stream->length;
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_DECRYPT_KTRI_2);
FALL_THROUGH;
case WC_PKCS7_DECRYPT_KTRI_2:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz, pkcs7->stream->expected,
&pkiMsg, idx)) != 0) {
return ret;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK,
in, inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
wc_PKCS7_StreamGetVar(pkcs7, NULL, &sidType, &version);
/* @TODO get expected size for next part, does not account for
* GetInt call well */
if (pkcs7->stream->expected == MAX_SEQ_SZ) {
int sz;
word32 lidx;
if (sidType == CMS_ISSUER_AND_SERIAL_NUMBER) {
lidx = *idx;
ret = GetSequence(pkiMsg, &lidx, &sz, pkiMsgSz);
if (ret < 0)
return ret;
}
else {
lidx = *idx + ASN_TAG_SZ;
ret = GetLength(pkiMsg, &lidx, &sz, pkiMsgSz);
if (ret < 0)
return ret;
}
pkcs7->stream->expected = sz + MAX_ALGO_SZ + ASN_TAG_SZ +
MAX_LENGTH_SZ;
if (pkcs7->stream->length > 0 &&
pkcs7->stream->length < pkcs7->stream->expected) {
return WC_PKCS7_WANT_READ_E;
}
}
#endif /* !NO_PKCS7_STREAM */
if (sidType == CMS_ISSUER_AND_SERIAL_NUMBER) {
/* remove IssuerAndSerialNumber */
if (GetSequence(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
if (GetNameHash(pkiMsg, idx, issuerHash, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* if we found correct recipient, issuer hashes will match */
if (XMEMCMP(issuerHash, pkcs7->issuerHash, KEYID_SIZE) == 0) {
*recipFound = 1;
}
#ifdef WOLFSSL_SMALL_STACK
serialNum = (mp_int*)XMALLOC(sizeof(mp_int), pkcs7->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (serialNum == NULL)
return MEMORY_E;
#endif
if (GetInt(serialNum, pkiMsg, idx, pkiMsgSz) < 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(serialNum, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ASN_PARSE_E;
}
mp_clear(serialNum);
#ifdef WOLFSSL_SMALL_STACK
XFREE(serialNum, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
} else {
/* remove SubjectKeyIdentifier */
if (pkiMsg[(*idx)++] !=
(ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC | 0))
return ASN_PARSE_E;
if (GetLength(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
if (pkiMsg[(*idx)++] != ASN_OCTET_STRING)
return ASN_PARSE_E;
if (GetLength(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* if we found correct recipient, SKID will match */
if (XMEMCMP(pkiMsg + (*idx), pkcs7->issuerSubjKeyId,
KEYID_SIZE) == 0) {
*recipFound = 1;
}
(*idx) += KEYID_SIZE;
}
if (GetAlgoId(pkiMsg, idx, &encOID, oidKeyType, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* key encryption algorithm must be RSA for now */
if (encOID != RSAk)
return ALGO_ID_E;
/* read encryptedKey */
if (pkiMsg[(*idx)++] != ASN_OCTET_STRING) {
return ASN_PARSE_E;
}
if (GetLength(pkiMsg, idx, &encryptedKeySz, pkiMsgSz) < 0) {
return ASN_PARSE_E;
}
if (encryptedKeySz > MAX_ENCRYPTED_KEY_SZ) {
return BUFFER_E;
}
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, idx)) != 0) {
break;
}
wc_PKCS7_StreamStoreVar(pkcs7, encryptedKeySz, sidType, version);
pkcs7->stream->expected = encryptedKeySz;
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_DECRYPT_KTRI_3);
FALL_THROUGH;
case WC_PKCS7_DECRYPT_KTRI_3:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz,
pkcs7->stream->expected, &pkiMsg, idx)) != 0) {
return ret;
}
encryptedKeySz = pkcs7->stream->expected;
#endif
#ifdef WOLFSSL_SMALL_STACK
encryptedKey = (byte*)XMALLOC(encryptedKeySz, pkcs7->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (encryptedKey == NULL)
return MEMORY_E;
#endif
if (*recipFound == 1)
XMEMCPY(encryptedKey, &pkiMsg[*idx], encryptedKeySz);
*idx += encryptedKeySz;
/* load private key */
#ifdef WOLFSSL_SMALL_STACK
privKey = (RsaKey*)XMALLOC(sizeof(RsaKey), pkcs7->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (privKey == NULL) {
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
return MEMORY_E;
}
#endif
ret = wc_InitRsaKey_ex(privKey, pkcs7->heap, INVALID_DEVID);
if (ret != 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(privKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ret;
}
if (pkcs7->privateKey != NULL && pkcs7->privateKeySz > 0) {
keyIdx = 0;
ret = wc_RsaPrivateKeyDecode(pkcs7->privateKey, &keyIdx,
privKey, pkcs7->privateKeySz);
}
else if (pkcs7->devId == INVALID_DEVID) {
ret = BAD_FUNC_ARG;
}
if (ret != 0) {
WOLFSSL_MSG("Failed to decode RSA private key");
wc_FreeRsaKey(privKey);
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(privKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ret;
}
/* decrypt encryptedKey */
#ifdef WC_RSA_BLINDING
ret = wc_InitRng_ex(&rng, pkcs7->heap, pkcs7->devId);
if (ret == 0) {
ret = wc_RsaSetRNG(privKey, &rng);
}
#endif
if (ret == 0) {
keySz = wc_RsaPrivateDecryptInline(encryptedKey, encryptedKeySz,
&outKey, privKey);
#ifdef WC_RSA_BLINDING
wc_FreeRng(&rng);
#endif
} else {
keySz = ret;
}
wc_FreeRsaKey(privKey);
if (keySz <= 0 || outKey == NULL) {
ForceZero(encryptedKey, encryptedKeySz);
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(privKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return keySz;
} else {
*decryptedKeySz = keySz;
XMEMCPY(decryptedKey, outKey, keySz);
ForceZero(encryptedKey, encryptedKeySz);
}
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(privKey, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, idx)) != 0) {
break;
}
#endif
ret = 0; /* success */
break;
default:
WOLFSSL_MSG("PKCS7 Unknown KTRI decrypt state");
ret = BAD_FUNC_ARG;
}
return ret;
}
#endif /* !NO_RSA */
#ifdef HAVE_ECC
/* remove ASN.1 OriginatorIdentifierOrKey, return 0 on success, <0 on error */
static int wc_PKCS7_KariGetOriginatorIdentifierOrKey(WC_PKCS7_KARI* kari,
byte* pkiMsg, word32 pkiMsgSz, word32* idx)
{
int ret, length;
word32 keyOID;
if (kari == NULL || pkiMsg == NULL || idx == NULL)
return BAD_FUNC_ARG;
/* remove OriginatorIdentifierOrKey */
if (pkiMsg[*idx] == (ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC | 0)) {
(*idx)++;
if (GetLength(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
} else {
return ASN_PARSE_E;
}
/* remove OriginatorPublicKey */
if (pkiMsg[*idx] == (ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC | 1)) {
(*idx)++;
if (GetLength(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
} else {
return ASN_PARSE_E;
}
/* remove AlgorithmIdentifier */
if (GetAlgoId(pkiMsg, idx, &keyOID, oidKeyType, pkiMsgSz) < 0)
return ASN_PARSE_E;
if (keyOID != ECDSAk)
return ASN_PARSE_E;
/* remove ECPoint BIT STRING */
if ((pkiMsgSz > (*idx + 1)) && (pkiMsg[(*idx)++] != ASN_BIT_STRING))
return ASN_PARSE_E;
if (GetLength(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
if ((pkiMsgSz < (*idx + 1)) || (pkiMsg[(*idx)++] != 0x00))
return ASN_EXPECT_0_E;
/* get sender ephemeral public ECDSA key */
ret = wc_ecc_init_ex(kari->senderKey, kari->heap, kari->devId);
if (ret != 0)
return ret;
kari->senderKeyInit = 1;
/* length-1 for unused bits counter */
ret = wc_ecc_import_x963(pkiMsg + (*idx), length - 1, kari->senderKey);
if (ret != 0)
return ret;
(*idx) += length - 1;
return 0;
}
/* remove optional UserKeyingMaterial if available, return 0 on success,
* < 0 on error */
static int wc_PKCS7_KariGetUserKeyingMaterial(WC_PKCS7_KARI* kari,
byte* pkiMsg, word32 pkiMsgSz, word32* idx)
{
int length;
word32 savedIdx;
if (kari == NULL || pkiMsg == NULL || idx == NULL)
return BAD_FUNC_ARG;
savedIdx = *idx;
/* starts with EXPLICIT [1] */
if (pkiMsg[(*idx)++] != (ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC | 1)) {
*idx = savedIdx;
return 0;
}
if (GetLength(pkiMsg, idx, &length, pkiMsgSz) < 0) {
*idx = savedIdx;
return 0;
}
/* get OCTET STRING */
if ( (pkiMsgSz > ((*idx) + 1)) &&
(pkiMsg[(*idx)++] != ASN_OCTET_STRING) ) {
*idx = savedIdx;
return 0;
}
if (GetLength(pkiMsg, idx, &length, pkiMsgSz) < 0) {
*idx = savedIdx;
return 0;
}
kari->ukm = NULL;
if (length > 0) {
kari->ukm = (byte*)XMALLOC(length, kari->heap, DYNAMIC_TYPE_PKCS7);
if (kari->ukm == NULL)
return MEMORY_E;
XMEMCPY(kari->ukm, pkiMsg + (*idx), length);
kari->ukmOwner = 1;
}
(*idx) += length;
kari->ukmSz = length;
return 0;
}
/* remove ASN.1 KeyEncryptionAlgorithmIdentifier, return 0 on success,
* < 0 on error */
static int wc_PKCS7_KariGetKeyEncryptionAlgorithmId(WC_PKCS7_KARI* kari,
byte* pkiMsg, word32 pkiMsgSz, word32* idx,
word32* keyAgreeOID, word32* keyWrapOID)
{
if (kari == NULL || pkiMsg == NULL || idx == NULL ||
keyAgreeOID == NULL || keyWrapOID == NULL)
return BAD_FUNC_ARG;
/* remove KeyEncryptionAlgorithmIdentifier */
if (GetAlgoId(pkiMsg, idx, keyAgreeOID, oidCmsKeyAgreeType,
pkiMsgSz) < 0)
return ASN_PARSE_E;
/* remove KeyWrapAlgorithm, stored in parameter of KeyEncAlgoId */
if (GetAlgoId(pkiMsg, idx, keyWrapOID, oidKeyWrapType, pkiMsgSz) < 0)
return ASN_PARSE_E;
return 0;
}
/* remove ASN.1 SubjectKeyIdentifier, return 0 on success, < 0 on error
* if subject key ID matches, recipFound is set to 1 */
static int wc_PKCS7_KariGetSubjectKeyIdentifier(WC_PKCS7_KARI* kari,
byte* pkiMsg, word32 pkiMsgSz, word32* idx,
int* recipFound)
{
int length;
byte subjKeyId[KEYID_SIZE];
if (kari == NULL || pkiMsg == NULL || idx == NULL || recipFound == NULL)
return BAD_FUNC_ARG;
/* remove RecipientKeyIdentifier IMPLICIT [0] */
if ( (pkiMsgSz > (*idx + 1)) &&
(pkiMsg[(*idx)++] == (ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC | 0)) ) {
if (GetLength(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
} else {
return ASN_PARSE_E;
}
/* remove SubjectKeyIdentifier */
if ( (pkiMsgSz > (*idx + 1)) &&
(pkiMsg[(*idx)++] != ASN_OCTET_STRING) )
return ASN_PARSE_E;
if (GetLength(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
if (length != KEYID_SIZE)
return ASN_PARSE_E;
XMEMCPY(subjKeyId, pkiMsg + (*idx), KEYID_SIZE);
(*idx) += length;
/* subject key id should match if recipient found */
if (XMEMCMP(subjKeyId, kari->decoded->extSubjKeyId, KEYID_SIZE) == 0) {
*recipFound = 1;
}
return 0;
}
/* remove ASN.1 IssuerAndSerialNumber, return 0 on success, < 0 on error
* if issuer and serial number match, recipFound is set to 1 */
static int wc_PKCS7_KariGetIssuerAndSerialNumber(WC_PKCS7_KARI* kari,
byte* pkiMsg, word32 pkiMsgSz, word32* idx,
int* recipFound)
{
int length, ret;
byte issuerHash[KEYID_SIZE];
#ifdef WOLFSSL_SMALL_STACK
mp_int* serial;
mp_int* recipSerial;
#else
mp_int serial[1];
mp_int recipSerial[1];
#endif
/* remove IssuerAndSerialNumber */
if (GetSequence(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
if (GetNameHash(pkiMsg, idx, issuerHash, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* if we found correct recipient, issuer hashes will match */
if (XMEMCMP(issuerHash, kari->decoded->issuerHash, KEYID_SIZE) == 0) {
*recipFound = 1;
}
#ifdef WOLFSSL_SMALL_STACK
serial = (mp_int*)XMALLOC(sizeof(mp_int), kari->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (serial == NULL)
return MEMORY_E;
recipSerial = (mp_int*)XMALLOC(sizeof(mp_int), kari->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (recipSerial == NULL) {
XFREE(serial, kari->heap, DYNAMIC_TYPE_TMP_BUFFER);
return MEMORY_E;
}
#endif
if (GetInt(serial, pkiMsg, idx, pkiMsgSz) < 0) {
#ifdef WOLFSSL_SMALL_STACK
XFREE(serial, kari->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(recipSerial, kari->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ASN_PARSE_E;
}
ret = mp_read_unsigned_bin(recipSerial, kari->decoded->serial,
kari->decoded->serialSz);
if (ret != MP_OKAY) {
mp_clear(serial);
WOLFSSL_MSG("Failed to parse CMS recipient serial number");
#ifdef WOLFSSL_SMALL_STACK
XFREE(serial, kari->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(recipSerial, kari->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ret;
}
if (mp_cmp(recipSerial, serial) != MP_EQ) {
mp_clear(serial);
mp_clear(recipSerial);
WOLFSSL_MSG("CMS serial number does not match recipient");
#ifdef WOLFSSL_SMALL_STACK
XFREE(serial, kari->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(recipSerial, kari->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return PKCS7_RECIP_E;
}
mp_clear(serial);
mp_clear(recipSerial);
#ifdef WOLFSSL_SMALL_STACK
XFREE(serial, kari->heap, DYNAMIC_TYPE_TMP_BUFFER);
XFREE(recipSerial, kari->heap, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return 0;
}
/* remove ASN.1 RecipientEncryptedKeys, return 0 on success, < 0 on error */
static int wc_PKCS7_KariGetRecipientEncryptedKeys(WC_PKCS7_KARI* kari,
byte* pkiMsg, word32 pkiMsgSz, word32* idx,
int* recipFound, byte* encryptedKey,
int* encryptedKeySz)
{
int length;
int ret = 0;
if (kari == NULL || pkiMsg == NULL || idx == NULL ||
recipFound == NULL || encryptedKey == NULL)
return BAD_FUNC_ARG;
/* remove RecipientEncryptedKeys */
if (GetSequence(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* remove RecipientEncryptedKeys */
if (GetSequence(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* KeyAgreeRecipientIdentifier is CHOICE of IssuerAndSerialNumber
* or [0] IMMPLICIT RecipientKeyIdentifier */
if ( (pkiMsgSz > (*idx + 1)) &&
(pkiMsg[*idx] == (ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC | 0)) ) {
/* try to get RecipientKeyIdentifier */
ret = wc_PKCS7_KariGetSubjectKeyIdentifier(kari, pkiMsg, pkiMsgSz,
idx, recipFound);
} else {
/* try to get IssuerAndSerialNumber */
ret = wc_PKCS7_KariGetIssuerAndSerialNumber(kari, pkiMsg, pkiMsgSz,
idx, recipFound);
}
/* if we don't have either option, malformed CMS */
if (ret != 0)
return ret;
/* remove EncryptedKey */
if ( (pkiMsgSz > (*idx + 1)) &&
(pkiMsg[(*idx)++] != ASN_OCTET_STRING) )
return ASN_PARSE_E;
if (GetLength(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* put encrypted CEK in decryptedKey buffer for now, decrypt later */
if (length > *encryptedKeySz)
return BUFFER_E;
XMEMCPY(encryptedKey, pkiMsg + (*idx), length);
*encryptedKeySz = length;
(*idx) += length;
return 0;
}
#endif /* HAVE_ECC */
int wc_PKCS7_SetOriEncryptCtx(PKCS7* pkcs7, void* ctx)
{
if (pkcs7 == NULL)
return BAD_FUNC_ARG;
pkcs7->oriEncryptCtx = ctx;
return 0;
}
int wc_PKCS7_SetOriDecryptCtx(PKCS7* pkcs7, void* ctx)
{
if (pkcs7 == NULL)
return BAD_FUNC_ARG;
pkcs7->oriDecryptCtx = ctx;
return 0;
}
int wc_PKCS7_SetOriDecryptCb(PKCS7* pkcs7, CallbackOriDecrypt cb)
{
if (pkcs7 == NULL)
return BAD_FUNC_ARG;
pkcs7->oriDecryptCb = cb;
return 0;
}
/* Decrypt ASN.1 OtherRecipientInfo (ori), as defined by:
*
* OtherRecipientInfo ::= SEQUENCE {
* oriType OBJECT IDENTIFIER,
* oriValue ANY DEFINED BY oriType }
*
* pkcs7 - pointer to initialized PKCS7 structure
* pkiMsg - pointer to encoded CMS bundle
* pkiMsgSz - size of pkiMsg, bytes
* idx - [IN/OUT] pointer to index into pkiMsg
* decryptedKey - [OUT] output buf for decrypted content encryption key
* decryptedKeySz - [IN/OUT] size of buffer, size of decrypted key
* recipFound - [OUT] 1 if recipient has been found, 0 if not
*
* Return 0 on success, negative upon error.
*/
static int wc_PKCS7_DecryptOri(PKCS7* pkcs7, byte* in, word32 inSz,
word32* idx, byte* decryptedKey,
word32* decryptedKeySz, int* recipFound)
{
int ret, seqSz, oriOIDSz;
word32 oriValueSz, tmpIdx;
byte* oriValue;
byte oriOID[MAX_OID_SZ];
byte* pkiMsg = in;
word32 pkiMsgSz = inSz;
#ifndef NO_PKCS7_STREAM
word32 stateIdx = *idx;
long rc;
#endif
if (pkcs7->oriDecryptCb == NULL) {
WOLFSSL_MSG("You must register an ORI Decrypt callback");
return BAD_FUNC_ARG;
}
switch (pkcs7->state) {
case WC_PKCS7_DECRYPT_ORI:
#ifndef NO_PKCS7_STREAM
/* @TODO for now just get full buffer, needs divided up */
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz,
(pkcs7->stream->maxLen - pkcs7->stream->totalRd) +
pkcs7->stream->length, &pkiMsg, idx)) != 0) {
return ret;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK, in,
inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
#endif
/* get OtherRecipientInfo sequence length */
if (GetLength(pkiMsg, idx, &seqSz, pkiMsgSz) < 0)
return ASN_PARSE_E;
tmpIdx = *idx;
/* remove and store oriType OBJECT IDENTIFIER */
if (GetASNObjectId(pkiMsg, idx, &oriOIDSz, pkiMsgSz) != 0)
return ASN_PARSE_E;
XMEMCPY(oriOID, pkiMsg + *idx, oriOIDSz);
*idx += oriOIDSz;
/* get oriValue, increment idx */
oriValue = pkiMsg + *idx;
oriValueSz = seqSz - (*idx - tmpIdx);
*idx += oriValueSz;
/* pass oriOID and oriValue to user callback, expect back
decryptedKey and size */
ret = pkcs7->oriDecryptCb(pkcs7, oriOID, (word32)oriOIDSz, oriValue,
oriValueSz, decryptedKey, decryptedKeySz,
pkcs7->oriDecryptCtx);
if (ret != 0 || decryptedKey == NULL || *decryptedKeySz == 0) {
/* decrypt operation failed */
*recipFound = 0;
return PKCS7_RECIP_E;
}
/* mark recipFound, since we only support one RecipientInfo for now */
*recipFound = 1;
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &stateIdx, idx)) != 0) {
break;
}
#endif
ret = 0; /* success */
break;
default:
WOLFSSL_MSG("PKCS7 ORI unknown state");
ret = BAD_FUNC_ARG;
}
return ret;
}
#if !defined(NO_PWDBASED) && !defined(NO_SHA)
/* decode ASN.1 PasswordRecipientInfo (pwri), return 0 on success,
* < 0 on error */
static int wc_PKCS7_DecryptPwri(PKCS7* pkcs7, byte* in, word32 inSz,
word32* idx, byte* decryptedKey,
word32* decryptedKeySz, int* recipFound)
{
byte* salt;
byte* cek;
byte* kek;
byte tmpIv[MAX_CONTENT_IV_SIZE];
int ret = 0, length, saltSz, iterations, blockSz, kekKeySz;
int hashOID = WC_SHA; /* default to SHA1 */
word32 kdfAlgoId, pwriEncAlgoId, keyEncAlgoId, cekSz;
byte* pkiMsg = in;
word32 pkiMsgSz = inSz;
#ifndef NO_PKCS7_STREAM
word32 tmpIdx = *idx;
long rc;
#endif
switch (pkcs7->state) {
case WC_PKCS7_DECRYPT_PWRI:
#ifndef NO_PKCS7_STREAM
/*@TODO for now just get full buffer, needs divided up */
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz,
(pkcs7->stream->maxLen - pkcs7->stream->totalRd) +
pkcs7->stream->length, &pkiMsg, idx)) != 0) {
return ret;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK, in,
inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
#endif
/* remove KeyDerivationAlgorithmIdentifier */
if (pkiMsg[(*idx)++] != (ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC | 0))
return ASN_PARSE_E;
if (GetLength(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* get KeyDerivationAlgorithmIdentifier */
if (wc_GetContentType(pkiMsg, idx, &kdfAlgoId, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* get KDF params SEQ */
if (GetSequence(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* get KDF salt OCTET STRING */
if ( (pkiMsgSz > ((*idx) + 1)) &&
(pkiMsg[(*idx)++] != ASN_OCTET_STRING) ) {
return ASN_PARSE_E;
}
if (GetLength(pkiMsg, idx, &saltSz, pkiMsgSz) < 0)
return ASN_PARSE_E;
salt = (byte*)XMALLOC(saltSz, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (salt == NULL)
return MEMORY_E;
XMEMCPY(salt, pkiMsg + (*idx), saltSz);
*idx += saltSz;
/* get KDF iterations */
if (GetMyVersion(pkiMsg, idx, &iterations, pkiMsgSz) < 0) {
XFREE(salt, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ASN_PARSE_E;
}
/* get KeyEncAlgoId SEQ */
if (GetSequence(pkiMsg, idx, &length, pkiMsgSz) < 0) {
XFREE(salt, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ASN_PARSE_E;
}
/* get KeyEncAlgoId */
if (wc_GetContentType(pkiMsg, idx, &keyEncAlgoId, pkiMsgSz) < 0) {
XFREE(salt, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ASN_PARSE_E;
}
/* get pwriEncAlgoId */
if (GetAlgoId(pkiMsg, idx, &pwriEncAlgoId, oidBlkType, pkiMsgSz) < 0) {
XFREE(salt, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ASN_PARSE_E;
}
blockSz = wc_PKCS7_GetOIDBlockSize(pwriEncAlgoId);
if (blockSz < 0) {
XFREE(salt, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return blockSz;
}
/* get content-encryption key size, based on algorithm */
kekKeySz = wc_PKCS7_GetOIDKeySize(pwriEncAlgoId);
if (kekKeySz < 0) {
XFREE(salt, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return kekKeySz;
}
/* get block cipher IV, stored in OPTIONAL parameter of AlgoID */
if ( (pkiMsgSz > ((*idx) + 1)) &&
(pkiMsg[(*idx)++] != ASN_OCTET_STRING) ) {
XFREE(salt, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ASN_PARSE_E;
}
if (GetLength(pkiMsg, idx, &length, pkiMsgSz) < 0) {
XFREE(salt, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ASN_PARSE_E;
}
if (length != blockSz) {
WOLFSSL_MSG("Incorrect IV length, must be of content alg block size");
XFREE(salt, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ASN_PARSE_E;
}
XMEMCPY(tmpIv, pkiMsg + (*idx), length);
*idx += length;
/* get EncryptedKey */
if ( (pkiMsgSz < ((*idx) + 1)) ||
(pkiMsg[(*idx)++] != ASN_OCTET_STRING) ) {
XFREE(salt, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ASN_PARSE_E;
}
if (GetLength(pkiMsg, idx, &length, pkiMsgSz) < 0) {
XFREE(salt, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ASN_PARSE_E;
}
/* allocate temporary space for decrypted key */
cekSz = length;
cek = (byte*)XMALLOC(cekSz, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
if (cek == NULL) {
XFREE(salt, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return MEMORY_E;
}
/* generate KEK */
kek = (byte*)XMALLOC(kekKeySz, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (kek == NULL) {
XFREE(salt, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(cek, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return MEMORY_E;
}
ret = wc_PKCS7_GenerateKEK_PWRI(pkcs7, pkcs7->pass, pkcs7->passSz,
salt, saltSz, kdfAlgoId, hashOID,
iterations, kek, kekKeySz);
if (ret < 0) {
XFREE(salt, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(kek, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(cek, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ASN_PARSE_E;
}
/* decrypt CEK with KEK */
ret = wc_PKCS7_PwriKek_KeyUnWrap(pkcs7, kek, kekKeySz,
pkiMsg + (*idx), length, cek,
cekSz, tmpIv, blockSz,
pwriEncAlgoId);
if (ret < 0) {
XFREE(salt, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(kek, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(cek, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
cekSz = ret;
if (*decryptedKeySz < cekSz) {
WOLFSSL_MSG("Decrypted key buffer too small for CEK");
XFREE(salt, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(kek, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(cek, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return BUFFER_E;
}
XMEMCPY(decryptedKey, cek, cekSz);
*decryptedKeySz = cekSz;
XFREE(salt, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(kek, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(cek, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
/* mark recipFound, since we only support one RecipientInfo for now */
*recipFound = 1;
*idx += length;
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, idx)) != 0) {
break;
}
#endif
ret = 0; /* success */
break;
default:
WOLFSSL_MSG("PKCS7 PWRI unknown state");
ret = BAD_FUNC_ARG;
}
return ret;
}
#endif /* NO_PWDBASED | NO_SHA */
/* decode ASN.1 KEKRecipientInfo (kekri), return 0 on success,
* < 0 on error */
static int wc_PKCS7_DecryptKekri(PKCS7* pkcs7, byte* in, word32 inSz,
word32* idx, byte* decryptedKey,
word32* decryptedKeySz, int* recipFound)
{
int length, keySz, dateLen, direction;
byte* keyId = NULL;
const byte* datePtr = NULL;
byte dateFormat;
word32 keyIdSz, kekIdSz, keyWrapOID;
int ret = 0;
byte* pkiMsg = in;
word32 pkiMsgSz = inSz;
#ifndef NO_PKCS7_STREAM
word32 tmpIdx = *idx;
long rc;
#endif
switch (pkcs7->state) {
case WC_PKCS7_DECRYPT_KEKRI:
#ifndef NO_PKCS7_STREAM
/* @TODO for now just get full buffer, needs divided up */
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz,
(pkcs7->stream->maxLen - pkcs7->stream->totalRd) +
pkcs7->stream->length, &pkiMsg, idx)) != 0) {
return ret;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK, in,
inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
#endif
/* remove KEKIdentifier */
if (GetSequence(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
kekIdSz = length;
if (pkiMsg[(*idx)++] != ASN_OCTET_STRING)
return ASN_PARSE_E;
if (GetLength(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* save keyIdentifier and length */
keyId = pkiMsg;
keyIdSz = length;
*idx += keyIdSz;
/* may have OPTIONAL GeneralizedTime */
if ((*idx < kekIdSz) && (pkiMsg[*idx] == ASN_GENERALIZED_TIME)) {
if (wc_GetDateInfo(pkiMsg + *idx, pkiMsgSz, &datePtr, &dateFormat,
&dateLen) != 0) {
return ASN_PARSE_E;
}
*idx += (dateLen + 1);
}
/* may have OPTIONAL OtherKeyAttribute */
if ((*idx < kekIdSz) && (pkiMsg[*idx] ==
(ASN_SEQUENCE | ASN_CONSTRUCTED))) {
if (GetSequence(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* skip it */
*idx += length;
}
/* get KeyEncryptionAlgorithmIdentifier */
if (GetAlgoId(pkiMsg, idx, &keyWrapOID, oidKeyWrapType, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* get EncryptedKey */
if (pkiMsg[(*idx)++] != ASN_OCTET_STRING)
return ASN_PARSE_E;
if (GetLength(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
#ifndef NO_AES
direction = AES_DECRYPTION;
#else
direction = DES_DECRYPTION;
#endif
/* decrypt CEK with KEK */
keySz = wc_PKCS7_KeyWrap(pkiMsg + *idx, length, pkcs7->privateKey,
pkcs7->privateKeySz, decryptedKey, *decryptedKeySz,
keyWrapOID, direction);
if (keySz <= 0)
return keySz;
*decryptedKeySz = (word32)keySz;
/* mark recipFound, since we only support one RecipientInfo for now */
*recipFound = 1;
*idx += length;
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, idx)) != 0) {
break;
}
#endif
ret = 0; /* success */
break;
default:
WOLFSSL_MSG("PKCS7 KEKRI unknown state");
ret = BAD_FUNC_ARG;
}
(void)keyId;
return ret;
}
/* decode ASN.1 KeyAgreeRecipientInfo (kari), return 0 on success,
* < 0 on error */
static int wc_PKCS7_DecryptKari(PKCS7* pkcs7, byte* in, word32 inSz,
word32* idx, byte* decryptedKey,
word32* decryptedKeySz, int* recipFound)
{
#ifdef HAVE_ECC
int ret, keySz;
int encryptedKeySz;
int direction = 0;
word32 keyAgreeOID, keyWrapOID;
#ifdef WOLFSSL_SMALL_STACK
byte* encryptedKey;
#else
byte encryptedKey[MAX_ENCRYPTED_KEY_SZ];
#endif
byte* pkiMsg = in;
word32 pkiMsgSz = inSz;
#ifndef NO_PKCS7_STREAM
word32 tmpIdx = (idx) ? *idx : 0;
long rc;
#endif
if (pkcs7 == NULL || pkcs7->singleCert == NULL ||
pkcs7->singleCertSz == 0 || pkiMsg == NULL ||
idx == NULL || decryptedKey == NULL || decryptedKeySz == NULL) {
return BAD_FUNC_ARG;
}
switch (pkcs7->state) {
case WC_PKCS7_DECRYPT_KARI: {
#ifndef NO_PKCS7_STREAM
/* @TODO for now just get full buffer, needs divided up */
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz,
(pkcs7->stream->maxLen - pkcs7->stream->totalRd) +
pkcs7->stream->length, &pkiMsg, idx)) != 0) {
return ret;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK, in,
inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
#endif
WC_PKCS7_KARI* kari;
kari = wc_PKCS7_KariNew(pkcs7, WC_PKCS7_DECODE);
if (kari == NULL)
return MEMORY_E;
#ifdef WOLFSSL_SMALL_STACK
encryptedKey = (byte*)XMALLOC(MAX_ENCRYPTED_KEY_SZ, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (encryptedKey == NULL) {
wc_PKCS7_KariFree(kari);
return MEMORY_E;
}
#endif
encryptedKeySz = MAX_ENCRYPTED_KEY_SZ;
/* parse cert and key */
ret = wc_PKCS7_KariParseRecipCert(kari, (byte*)pkcs7->singleCert,
pkcs7->singleCertSz, pkcs7->privateKey,
pkcs7->privateKeySz);
if (ret != 0) {
wc_PKCS7_KariFree(kari);
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#endif
return ret;
}
/* remove OriginatorIdentifierOrKey */
ret = wc_PKCS7_KariGetOriginatorIdentifierOrKey(kari, pkiMsg,
pkiMsgSz, idx);
if (ret != 0) {
wc_PKCS7_KariFree(kari);
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#endif
return ret;
}
/* try and remove optional UserKeyingMaterial */
ret = wc_PKCS7_KariGetUserKeyingMaterial(kari, pkiMsg, pkiMsgSz, idx);
if (ret != 0) {
wc_PKCS7_KariFree(kari);
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#endif
return ret;
}
/* remove KeyEncryptionAlgorithmIdentifier */
ret = wc_PKCS7_KariGetKeyEncryptionAlgorithmId(kari, pkiMsg, pkiMsgSz,
idx, &keyAgreeOID,
&keyWrapOID);
if (ret != 0) {
wc_PKCS7_KariFree(kari);
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#endif
return ret;
}
/* if user has not explicitly set keyAgreeOID, set from one in bundle */
if (pkcs7->keyAgreeOID == 0)
pkcs7->keyAgreeOID = keyAgreeOID;
/* set direction based on key wrap algorithm */
switch (keyWrapOID) {
#ifndef NO_AES
#ifdef WOLFSSL_AES_128
case AES128_WRAP:
#endif
#ifdef WOLFSSL_AES_192
case AES192_WRAP:
#endif
#ifdef WOLFSSL_AES_256
case AES256_WRAP:
#endif
direction = AES_DECRYPTION;
break;
#endif
default:
wc_PKCS7_KariFree(kari);
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#endif
WOLFSSL_MSG("AES key wrap algorithm unsupported");
return BAD_KEYWRAP_ALG_E;
}
/* remove RecipientEncryptedKeys */
ret = wc_PKCS7_KariGetRecipientEncryptedKeys(kari, pkiMsg, pkiMsgSz,
idx, recipFound, encryptedKey, &encryptedKeySz);
if (ret != 0) {
wc_PKCS7_KariFree(kari);
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#endif
return ret;
}
/* create KEK */
ret = wc_PKCS7_KariGenerateKEK(kari, keyWrapOID, pkcs7->keyAgreeOID);
if (ret != 0) {
wc_PKCS7_KariFree(kari);
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#endif
return ret;
}
/* decrypt CEK with KEK */
keySz = wc_PKCS7_KeyWrap(encryptedKey, encryptedKeySz, kari->kek,
kari->kekSz, decryptedKey, *decryptedKeySz,
keyWrapOID, direction);
if (keySz <= 0) {
wc_PKCS7_KariFree(kari);
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#endif
return keySz;
}
*decryptedKeySz = (word32)keySz;
wc_PKCS7_KariFree(kari);
#ifdef WOLFSSL_SMALL_STACK
XFREE(encryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
#endif
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, idx)) != 0) {
break;
}
#endif
ret = 0; /* success */
}
break;
default:
WOLFSSL_MSG("PKCS7 kari unknown state");
ret = BAD_FUNC_ARG;
}
return ret;
(void)pkiMsg;
(void)pkiMsgSz;
#else
(void)in;
(void)inSz;
(void)pkcs7;
(void)idx;
(void)decryptedKey;
(void)decryptedKeySz;
(void)recipFound;
return NOT_COMPILED_IN;
#endif /* HAVE_ECC */
}
/* decode ASN.1 RecipientInfos SET, return 0 on success, < 0 on error */
static int wc_PKCS7_DecryptRecipientInfos(PKCS7* pkcs7, byte* in,
word32 inSz, word32* idx, byte* decryptedKey,
word32* decryptedKeySz, int* recipFound)
{
word32 savedIdx;
int version, ret = 0, length;
byte* pkiMsg = in;
word32 pkiMsgSz = inSz;
#ifndef NO_PKCS7_STREAM
word32 tmpIdx = *idx;
long rc;
#endif
if (pkcs7 == NULL || pkiMsg == NULL || idx == NULL ||
decryptedKey == NULL || decryptedKeySz == NULL ||
recipFound == NULL) {
return BAD_FUNC_ARG;
}
/* check if in the process of decrypting */
switch (pkcs7->state) {
case WC_PKCS7_DECRYPT_KTRI:
case WC_PKCS7_DECRYPT_KTRI_2:
case WC_PKCS7_DECRYPT_KTRI_3:
#ifndef NO_RSA
ret = wc_PKCS7_DecryptKtri(pkcs7, in, inSz, idx,
decryptedKey, decryptedKeySz, recipFound);
#else
return NOT_COMPILED_IN;
#endif
break;
case WC_PKCS7_DECRYPT_KARI:
ret = wc_PKCS7_DecryptKari(pkcs7, in, inSz, idx,
decryptedKey, decryptedKeySz, recipFound);
break;
case WC_PKCS7_DECRYPT_KEKRI:
ret = wc_PKCS7_DecryptKekri(pkcs7, in, inSz, idx,
decryptedKey, decryptedKeySz, recipFound);
break;
case WC_PKCS7_DECRYPT_PWRI:
#if !defined(NO_PWDBASED) && !defined(NO_SHA)
ret = wc_PKCS7_DecryptPwri(pkcs7, in, inSz, idx,
decryptedKey, decryptedKeySz, recipFound);
#else
return NOT_COMPILED_IN;
#endif
break;
case WC_PKCS7_DECRYPT_ORI:
ret = wc_PKCS7_DecryptOri(pkcs7, in, inSz, idx,
decryptedKey, decryptedKeySz, recipFound);
break;
default:
/* not in decrypting state */
break;
}
if (ret < 0) {
return ret;
}
savedIdx = *idx;
#ifndef NO_PKCS7_STREAM
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK, in, inSz);
if (rc < 0) {
return (int)rc;
}
pkiMsgSz = (word32)rc;
if (pkcs7->stream->length > 0)
pkiMsg = pkcs7->stream->buffer;
#endif
/* when looking for next recipient, use first sequence and version to
* indicate there is another, if not, move on */
while(*recipFound == 0) {
/* remove RecipientInfo, if we don't have a SEQUENCE, back up idx to
* last good saved one */
if (GetSequence(pkiMsg, idx, &length, pkiMsgSz) > 0) {
#ifndef NO_RSA
/* found ktri */
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, idx)) != 0) {
break;
}
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_DECRYPT_KTRI);
ret = wc_PKCS7_DecryptKtri(pkcs7, in, inSz, idx,
decryptedKey, decryptedKeySz,
recipFound);
if (ret != 0)
return ret;
#else
return NOT_COMPILED_IN;
#endif
}
else {
/* kari is IMPLICIT[1] */
*idx = savedIdx;
if (pkiMsg[*idx] == (ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC | 1)) {
(*idx)++;
if (GetLength(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
if (GetMyVersion(pkiMsg, idx, &version, pkiMsgSz) < 0) {
*idx = savedIdx;
break;
}
if (version != 3)
return ASN_VERSION_E;
/* found kari */
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, idx)) != 0) {
break;
}
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_DECRYPT_KARI);
ret = wc_PKCS7_DecryptKari(pkcs7, in, inSz, idx,
decryptedKey, decryptedKeySz,
recipFound);
if (ret != 0)
return ret;
/* kekri is IMPLICIT[2] */
} else if (pkiMsg[*idx] == (ASN_CONSTRUCTED |
ASN_CONTEXT_SPECIFIC | 2)) {
(*idx)++;
if (GetLength(pkiMsg, idx, &version, pkiMsgSz) < 0)
return ASN_PARSE_E;
if (GetMyVersion(pkiMsg, idx, &version, pkiMsgSz) < 0) {
*idx = savedIdx;
break;
}
if (version != 4)
return ASN_VERSION_E;
/* found kekri */
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, idx)) != 0) {
break;
}
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_DECRYPT_KEKRI);
ret = wc_PKCS7_DecryptKekri(pkcs7, in, inSz, idx,
decryptedKey, decryptedKeySz,
recipFound);
if (ret != 0)
return ret;
/* pwri is IMPLICIT[3] */
} else if (pkiMsg[*idx] == (ASN_CONSTRUCTED |
ASN_CONTEXT_SPECIFIC | 3)) {
#if !defined(NO_PWDBASED) && !defined(NO_SHA)
(*idx)++;
if (GetLength(pkiMsg, idx, &version, pkiMsgSz) < 0)
return ASN_PARSE_E;
if (GetMyVersion(pkiMsg, idx, &version, pkiMsgSz) < 0) {
*idx = savedIdx;
break;
}
if (version != 0)
return ASN_VERSION_E;
/* found pwri */
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, idx)) != 0) {
break;
}
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_DECRYPT_PWRI);
ret = wc_PKCS7_DecryptPwri(pkcs7, in, inSz, idx,
decryptedKey, decryptedKeySz,
recipFound);
if (ret != 0)
return ret;
#else
return NOT_COMPILED_IN;
#endif
/* ori is IMPLICIT[4] */
} else if (pkiMsg[*idx] == (ASN_CONSTRUCTED |
ASN_CONTEXT_SPECIFIC | 4)) {
(*idx)++;
/* found ori */
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, idx)) != 0) {
break;
}
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_DECRYPT_ORI);
ret = wc_PKCS7_DecryptOri(pkcs7, in, inSz, idx,
decryptedKey, decryptedKeySz,
recipFound);
if (ret != 0)
return ret;
} else {
/* failed to find RecipientInfo, restore idx and continue */
*idx = savedIdx;
break;
}
}
/* update good idx */
savedIdx = *idx;
}
return ret;
}
/* Parse encoded EnvelopedData bundle up to RecipientInfo set.
*
* return size of RecipientInfo SET on success, negative upon error */
static int wc_PKCS7_ParseToRecipientInfoSet(PKCS7* pkcs7, byte* in,
word32 inSz, word32* idx,
int type)
{
int version = 0, length, ret = 0;
word32 contentType;
byte* pkiMsg = in;
word32 pkiMsgSz = inSz;
#ifndef NO_PKCS7_STREAM
word32 tmpIdx = 0;
long rc;
#endif
if (pkcs7 == NULL || pkiMsg == NULL || pkiMsgSz == 0 || idx == NULL)
return BAD_FUNC_ARG;
if ((type != ENVELOPED_DATA) && (type != AUTH_ENVELOPED_DATA))
return BAD_FUNC_ARG;
#ifndef NO_PKCS7_STREAM
if (pkcs7->stream == NULL) {
if ((ret = wc_PKCS7_CreateStream(pkcs7)) != 0) {
return ret;
}
}
#endif
switch (pkcs7->state) {
case WC_PKCS7_INFOSET_START:
case WC_PKCS7_INFOSET_BER:
case WC_PKCS7_INFOSET_STAGE1:
case WC_PKCS7_INFOSET_STAGE2:
case WC_PKCS7_INFOSET_END:
break;
default:
WOLFSSL_MSG("Warning, setting PKCS7 info state to start");
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_INFOSET_START);
}
switch (pkcs7->state) {
case WC_PKCS7_INFOSET_START:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz, MAX_SEQ_SZ +
ASN_TAG_SZ, &pkiMsg, idx)) != 0) {
return ret;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_SEQ_PEEK, in, inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
#endif
/* read past ContentInfo, verify type is envelopedData */
if (ret == 0 && GetSequence(pkiMsg, idx, &length, pkiMsgSz) < 0)
{
ret = ASN_PARSE_E;
}
if (ret == 0 && length == 0 && pkiMsg[(*idx)-1] == 0x80) {
#ifdef ASN_BER_TO_DER
word32 len;
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_INFOSET_BER);
FALL_THROUGH;
/* full buffer is needed for conversion */
case WC_PKCS7_INFOSET_BER:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz,
pkcs7->stream->maxLen - pkcs7->stream->length,
&pkiMsg, idx)) != 0) {
return ret;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK,
in, inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
#endif
len = 0;
ret = wc_BerToDer(pkiMsg, pkiMsgSz, NULL, &len);
if (ret != LENGTH_ONLY_E)
return ret;
pkcs7->der = (byte*)XMALLOC(len, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (pkcs7->der == NULL)
return MEMORY_E;
ret = wc_BerToDer(pkiMsg, pkiMsgSz, pkcs7->der, &len);
if (ret < 0)
return ret;
pkiMsg = pkcs7->der;
pkiMsgSz = len;
*idx = 0;
if (GetSequence(pkiMsg, idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
#else
return BER_INDEF_E;
#endif
}
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, idx)) != 0) {
break;
}
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_INFOSET_STAGE1);
FALL_THROUGH;
case WC_PKCS7_INFOSET_STAGE1:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz, MAX_OID_SZ +
MAX_LENGTH_SZ + ASN_TAG_SZ, &pkiMsg, idx)) != 0) {
return ret;
}
pkiMsgSz = (pkcs7->stream->length > 0)? pkcs7->stream->length :inSz;
#endif
if (ret == 0 && wc_GetContentType(pkiMsg, idx, &contentType, pkiMsgSz) < 0)
ret = ASN_PARSE_E;
if (ret == 0) {
if (type == ENVELOPED_DATA && contentType != ENVELOPED_DATA) {
WOLFSSL_MSG("PKCS#7 input not of type EnvelopedData");
ret = PKCS7_OID_E;
} else if (type == AUTH_ENVELOPED_DATA &&
contentType != AUTH_ENVELOPED_DATA) {
WOLFSSL_MSG("PKCS#7 input not of type AuthEnvelopedData");
ret = PKCS7_OID_E;
}
}
if (ret == 0 && pkiMsg[(*idx)++] !=
(ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC | 0))
ret = ASN_PARSE_E;
if (ret == 0 && GetLength_ex(pkiMsg, idx, &length, pkiMsgSz,
NO_USER_CHECK) < 0)
ret = ASN_PARSE_E;
if (ret < 0)
break;
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, idx)) != 0) {
break;
}
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_INFOSET_STAGE2);
FALL_THROUGH;
case WC_PKCS7_INFOSET_STAGE2:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz, MAX_SEQ_SZ +
MAX_VERSION_SZ, &pkiMsg, idx)) != 0) {
return ret;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK, in,
inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
#endif
/* remove EnvelopedData and version */
if (ret == 0 && GetSequence(pkiMsg, idx, &length, pkiMsgSz) < 0)
ret = ASN_PARSE_E;
if (ret == 0 && GetMyVersion(pkiMsg, idx, &version, pkiMsgSz) < 0)
ret = ASN_PARSE_E;
if (ret < 0)
break;
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, idx)) != 0) {
break;
}
pkcs7->stream->varOne = version;
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_INFOSET_END);
FALL_THROUGH;
case WC_PKCS7_INFOSET_END:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz,
MAX_SET_SZ, &pkiMsg, idx)) != 0) {
return ret;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK, in,
inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
version = pkcs7->stream->varOne;
#endif
if (type == ENVELOPED_DATA) {
/* TODO :: make this more accurate */
if ((pkcs7->publicKeyOID == RSAk &&
(version != 0 && version != 2))
#ifdef HAVE_ECC
|| (pkcs7->publicKeyOID == ECDSAk &&
(version != 0 && version != 2 && version != 3))
#endif
) {
WOLFSSL_MSG("PKCS#7 envelopedData version incorrect");
ret = ASN_VERSION_E;
}
} else {
/* AuthEnvelopedData version MUST be 0 */
if (version != 0) {
WOLFSSL_MSG("PKCS#7 AuthEnvelopedData needs to be of version 0");
ret = ASN_VERSION_E;
}
}
/* remove RecipientInfo set, get length of set */
if (ret == 0 && GetSet(pkiMsg, idx, &length, pkiMsgSz) < 0)
ret = ASN_PARSE_E;
if (ret < 0)
break;
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, idx)) != 0) {
break;
}
#endif
if (ret == 0)
ret = length;
break;
default:
WOLFSSL_MSG("Bad PKCS7 info set state");
ret = BAD_FUNC_ARG;
break;
}
return ret;
}
/* Import secret/private key into a PKCS7 structure. Used for setting
* the secret key for decryption a EnvelopedData KEKRI RecipientInfo.
*
* Returns 0 on success, negative upon error */
WOLFSSL_API int wc_PKCS7_SetKey(PKCS7* pkcs7, byte* key, word32 keySz)
{
if (pkcs7 == NULL || key == NULL || keySz == 0)
return BAD_FUNC_ARG;
pkcs7->privateKey = key;
pkcs7->privateKeySz = keySz;
return 0;
}
/* unwrap and decrypt PKCS#7 envelopedData object, return decoded size */
WOLFSSL_API int wc_PKCS7_DecodeEnvelopedData(PKCS7* pkcs7, byte* in,
word32 inSz, byte* output,
word32 outputSz)
{
int recipFound = 0;
int ret, length = 0;
word32 idx = 0;
#ifndef NO_PKCS7_STREAM
word32 tmpIdx = 0;
long rc;
#endif
word32 contentType, encOID = 0;
word32 decryptedKeySz = MAX_ENCRYPTED_KEY_SZ;
int expBlockSz = 0, blockKeySz = 0;
byte tmpIvBuf[MAX_CONTENT_IV_SIZE];
byte* tmpIv = tmpIvBuf;
byte* pkiMsg = in;
word32 pkiMsgSz = inSz;
byte* decryptedKey = NULL;
int encryptedContentSz = 0;
byte padLen;
byte* encryptedContent = NULL;
int explicitOctet;
if (pkcs7 == NULL)
return BAD_FUNC_ARG;
if (pkiMsg == NULL || pkiMsgSz == 0 ||
output == NULL || outputSz == 0)
return BAD_FUNC_ARG;
#ifndef NO_PKCS7_STREAM
(void)tmpIv; /* help out static analysis */
if (pkcs7->stream == NULL) {
if ((ret = wc_PKCS7_CreateStream(pkcs7)) != 0) {
return ret;
}
}
#endif
switch (pkcs7->state) {
case WC_PKCS7_START:
case WC_PKCS7_INFOSET_START:
case WC_PKCS7_INFOSET_BER:
case WC_PKCS7_INFOSET_STAGE1:
case WC_PKCS7_INFOSET_STAGE2:
case WC_PKCS7_INFOSET_END:
ret = wc_PKCS7_ParseToRecipientInfoSet(pkcs7, pkiMsg, pkiMsgSz,
&idx, ENVELOPED_DATA);
if (ret < 0) {
break;
}
decryptedKey = (byte*)XMALLOC(MAX_ENCRYPTED_KEY_SZ, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (decryptedKey == NULL)
return MEMORY_E;
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_ENV_2);
#ifndef NO_PKCS7_STREAM
tmpIdx = idx;
pkcs7->stream->aad = decryptedKey;
#endif
FALL_THROUGH;
case WC_PKCS7_ENV_2:
#ifndef NO_PKCS7_STREAM
/* store up enough buffer for initial info set decode */
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz, MAX_LENGTH_SZ +
MAX_VERSION_SZ + ASN_TAG_SZ, &pkiMsg, &idx)) != 0) {
return ret;
}
#endif
FALL_THROUGH;
case WC_PKCS7_DECRYPT_KTRI:
case WC_PKCS7_DECRYPT_KTRI_2:
case WC_PKCS7_DECRYPT_KTRI_3:
case WC_PKCS7_DECRYPT_KARI:
case WC_PKCS7_DECRYPT_KEKRI:
case WC_PKCS7_DECRYPT_PWRI:
case WC_PKCS7_DECRYPT_ORI:
#ifndef NO_PKCS7_STREAM
decryptedKey = pkcs7->stream->aad;
decryptedKeySz = MAX_ENCRYPTED_KEY_SZ;
#endif
ret = wc_PKCS7_DecryptRecipientInfos(pkcs7, in, inSz, &idx,
decryptedKey, &decryptedKeySz,
&recipFound);
if (ret == 0 && recipFound == 0) {
WOLFSSL_MSG("No recipient found in envelopedData that matches input");
ret = PKCS7_RECIP_E;
}
if (ret != 0)
break;
#ifndef NO_PKCS7_STREAM
tmpIdx = idx;
pkcs7->stream->aadSz = decryptedKeySz;
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_ENV_3);
FALL_THROUGH;
case WC_PKCS7_ENV_3:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz, MAX_LENGTH_SZ +
MAX_VERSION_SZ + ASN_TAG_SZ +
MAX_LENGTH_SZ, &pkiMsg, &idx))
!= 0) {
return ret;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK, in,
inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
#else
ret = 0;
#endif
/* remove EncryptedContentInfo */
if (ret == 0 && GetSequence(pkiMsg, &idx, &length, pkiMsgSz) < 0) {
ret = ASN_PARSE_E;
}
if (ret == 0 && wc_GetContentType(pkiMsg, &idx, &contentType,
pkiMsgSz) < 0) {
ret = ASN_PARSE_E;
}
if (ret == 0 && GetAlgoId(pkiMsg, &idx, &encOID, oidBlkType,
pkiMsgSz) < 0) {
ret = ASN_PARSE_E;
}
blockKeySz = wc_PKCS7_GetOIDKeySize(encOID);
if (ret == 0 && blockKeySz < 0) {
ret = blockKeySz;
}
expBlockSz = wc_PKCS7_GetOIDBlockSize(encOID);
if (ret == 0 && expBlockSz < 0) {
ret = expBlockSz;
}
/* get block cipher IV, stored in OPTIONAL parameter of AlgoID */
if (ret == 0 && pkiMsg[idx++] != ASN_OCTET_STRING) {
ret = ASN_PARSE_E;
}
if (ret == 0 && GetLength(pkiMsg, &idx, &length, pkiMsgSz) < 0) {
ret = ASN_PARSE_E;
}
if (ret == 0 && length != expBlockSz) {
WOLFSSL_MSG("Incorrect IV length, must be of content alg block size");
ret = ASN_PARSE_E;
}
if (ret != 0)
break;
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, &idx)) != 0) {
break;
}
wc_PKCS7_StreamStoreVar(pkcs7, encOID, expBlockSz, length);
pkcs7->stream->contentSz = blockKeySz;
pkcs7->stream->expected = length + MAX_LENGTH_SZ + MAX_LENGTH_SZ +
ASN_TAG_SZ + ASN_TAG_SZ;
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_ENV_4);
FALL_THROUGH;
case WC_PKCS7_ENV_4:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz,
pkcs7->stream->expected, &pkiMsg, &idx)) != 0) {
return ret;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK, in,
inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
wc_PKCS7_StreamGetVar(pkcs7, 0, 0, &length);
tmpIv = pkcs7->stream->tmpIv;
if (tmpIv == NULL) {
/* check added to help out static analysis tool */
ret = MEMORY_E;
break;
}
#else
ret = 0;
#endif
XMEMCPY(tmpIv, &pkiMsg[idx], length);
idx += length;
explicitOctet = pkiMsg[idx] ==
(ASN_CONTEXT_SPECIFIC | ASN_CONSTRUCTED | 0);
/* read encryptedContent, cont[0] */
if (ret == 0 && pkiMsg[idx] != (ASN_CONTEXT_SPECIFIC | 0) &&
pkiMsg[idx] != (ASN_CONTEXT_SPECIFIC | ASN_CONSTRUCTED | 0)) {
ret = ASN_PARSE_E;
}
idx++;
if (ret == 0 && GetLength(pkiMsg, &idx, &encryptedContentSz,
pkiMsgSz) <= 0) {
ret = ASN_PARSE_E;
}
if (ret == 0 && explicitOctet) {
if (ret == 0 && pkiMsg[idx++] != ASN_OCTET_STRING) {
ret = ASN_PARSE_E;
break;
}
if (ret == 0 && GetLength(pkiMsg, &idx, &encryptedContentSz,
pkiMsgSz) <= 0) {
ret = ASN_PARSE_E;
break;
}
}
if (ret != 0)
break;
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, &idx)) != 0) {
break;
}
pkcs7->stream->expected = encryptedContentSz;
wc_PKCS7_StreamGetVar(pkcs7, &encOID, &expBlockSz, 0);
wc_PKCS7_StreamStoreVar(pkcs7, encOID, expBlockSz,
encryptedContentSz);
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_ENV_5);
FALL_THROUGH;
case WC_PKCS7_ENV_5:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz,
pkcs7->stream->expected, &pkiMsg, &idx)) != 0) {
return ret;
}
wc_PKCS7_StreamGetVar(pkcs7, &encOID, &expBlockSz,
&encryptedContentSz);
tmpIv = pkcs7->stream->tmpIv;
/* restore decrypted key */
decryptedKey = pkcs7->stream->aad;
decryptedKeySz = pkcs7->stream->aadSz;
blockKeySz = pkcs7->stream->contentSz;
#else
ret = 0;
#endif
encryptedContent = (byte*)XMALLOC(encryptedContentSz, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (ret == 0 && encryptedContent == NULL) {
ret = MEMORY_E;
break;
}
if (ret == 0) {
XMEMCPY(encryptedContent, &pkiMsg[idx], encryptedContentSz);
}
/* decrypt encryptedContent */
ret = wc_PKCS7_DecryptContent(encOID, decryptedKey, blockKeySz,
tmpIv, expBlockSz, NULL, 0, NULL, 0,
encryptedContent, encryptedContentSz,
encryptedContent);
if (ret != 0) {
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
break;
}
padLen = encryptedContent[encryptedContentSz-1];
/* copy plaintext to output */
XMEMCPY(output, encryptedContent, encryptedContentSz - padLen);
/* free memory, zero out keys */
ForceZero(decryptedKey, MAX_ENCRYPTED_KEY_SZ);
ForceZero(encryptedContent, encryptedContentSz);
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(decryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
ret = encryptedContentSz - padLen;
#ifndef NO_PKCS7_STREAM
pkcs7->stream->aad = NULL;
pkcs7->stream->aadSz = 0;
wc_PKCS7_ResetStream(pkcs7);
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_START);
break;
default:
WOLFSSL_MSG("PKCS#7 unknown decode enveloped state");
ret = BAD_FUNC_ARG;
}
#ifndef NO_PKCS7_STREAM
if (ret < 0 && ret != WC_PKCS7_WANT_READ_E) {
wc_PKCS7_ResetStream(pkcs7);
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_START);
}
#else
if (decryptedKey != NULL && ret < 0) {
ForceZero(decryptedKey, MAX_ENCRYPTED_KEY_SZ);
XFREE(decryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
}
#endif
return ret;
}
/* build PKCS#7 authEnvelopedData content type, return enveloped size */
int wc_PKCS7_EncodeAuthEnvelopedData(PKCS7* pkcs7, byte* output,
word32 outputSz)
{
#if defined(HAVE_AESGCM) || defined(HAVE_AESCCM)
int ret, idx = 0;
int totalSz, encryptedOutSz;
int contentInfoSeqSz, outerContentTypeSz, outerContentSz;
byte contentInfoSeq[MAX_SEQ_SZ];
byte outerContentType[MAX_ALGO_SZ];
byte outerContent[MAX_SEQ_SZ];
int envDataSeqSz, verSz;
byte envDataSeq[MAX_SEQ_SZ];
byte ver[MAX_VERSION_SZ];
WC_RNG rng;
int blockSz, blockKeySz;
byte* encryptedContent;
Pkcs7EncodedRecip* tmpRecip = NULL;
int recipSz, recipSetSz;
byte recipSet[MAX_SET_SZ];
int encContentOctetSz, encContentSeqSz, contentTypeSz;
int contentEncAlgoSz, nonceOctetStringSz, macOctetStringSz;
byte encContentSeq[MAX_SEQ_SZ];
byte contentType[MAX_ALGO_SZ];
byte contentEncAlgo[MAX_ALGO_SZ];
byte nonceOctetString[MAX_OCTET_STR_SZ];
byte encContentOctet[MAX_OCTET_STR_SZ];
byte macOctetString[MAX_OCTET_STR_SZ];
byte authTag[AES_BLOCK_SIZE];
byte nonce[GCM_NONCE_MID_SZ]; /* GCM nonce is larger than CCM */
byte macInt[MAX_VERSION_SZ];
word32 nonceSz = 0, macIntSz = 0;
/* authAttribs */
byte* flatAuthAttribs = NULL;
byte authAttribSet[MAX_SET_SZ];
EncodedAttrib authAttribs[MAX_AUTH_ATTRIBS_SZ];
word32 authAttribsSz = 0, authAttribsCount = 0;
word32 authAttribsSetSz = 0;
byte* aadBuffer = NULL;
word32 aadBufferSz = 0;
byte authAttribAadSet[MAX_SET_SZ];
word32 authAttribsAadSetSz = 0;
/* unauthAttribs */
byte* flatUnauthAttribs = NULL;
byte unauthAttribSet[MAX_SET_SZ];
EncodedAttrib unauthAttribs[MAX_UNAUTH_ATTRIBS_SZ];
word32 unauthAttribsSz = 0, unauthAttribsCount = 0;
word32 unauthAttribsSetSz = 0;
PKCS7Attrib contentTypeAttrib;
byte contentTypeValue[MAX_OID_SZ];
/* contentType OID (1.2.840.113549.1.9.3) */
const byte contentTypeOid[] =
{ ASN_OBJECT_ID, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xF7, 0x0d, 0x01,
0x09, 0x03 };
if (pkcs7 == NULL || pkcs7->content == NULL || pkcs7->contentSz == 0)
return BAD_FUNC_ARG;
if (output == NULL || outputSz == 0)
return BAD_FUNC_ARG;
switch (pkcs7->encryptOID) {
#ifdef HAVE_AESGCM
#ifdef WOLFSSL_AES_128
case AES128GCMb:
break;
#endif
#ifdef WOLFSSL_AES_192
case AES192GCMb:
break;
#endif
#ifdef WOLFSSL_AES_256
case AES256GCMb:
break;
#endif
#endif
#ifdef HAVE_AESCCM
#ifdef WOLFSSL_AES_128
case AES128CCMb:
break;
#endif
#ifdef WOLFSSL_AES_192
case AES192CCMb:
break;
#endif
#ifdef WOLFSSL_AES_256
case AES256CCMb:
break;
#endif
#endif
default:
WOLFSSL_MSG("CMS AuthEnvelopedData must use AES-GCM or AES-CCM");
return BAD_FUNC_ARG;
}
blockKeySz = wc_PKCS7_GetOIDKeySize(pkcs7->encryptOID);
if (blockKeySz < 0)
return blockKeySz;
blockSz = wc_PKCS7_GetOIDBlockSize(pkcs7->encryptOID);
if (blockKeySz < 0 || blockSz < 0)
return blockSz;
/* outer content type */
ret = wc_SetContentType(AUTH_ENVELOPED_DATA, outerContentType,
sizeof(outerContentType));
if (ret < 0)
return ret;
outerContentTypeSz = ret;
/* version, defined as 0 in RFC 5083 */
verSz = SetMyVersion(0, ver, 0);
/* generate random content encryption key */
ret = PKCS7_GenerateContentEncryptionKey(pkcs7, blockKeySz);
if (ret != 0) {
return ret;
}
/* build RecipientInfo, only if user manually set singleCert and size */
if (pkcs7->singleCert != NULL && pkcs7->singleCertSz > 0) {
switch (pkcs7->publicKeyOID) {
#ifndef NO_RSA
case RSAk:
ret = wc_PKCS7_AddRecipient_KTRI(pkcs7, pkcs7->singleCert,
pkcs7->singleCertSz, 0);
break;
#endif
#ifdef HAVE_ECC
case ECDSAk:
ret = wc_PKCS7_AddRecipient_KARI(pkcs7, pkcs7->singleCert,
pkcs7->singleCertSz,
pkcs7->keyWrapOID,
pkcs7->keyAgreeOID, pkcs7->ukm,
pkcs7->ukmSz, 0);
break;
#endif
default:
WOLFSSL_MSG("Unsupported RecipientInfo public key type");
return BAD_FUNC_ARG;
};
if (ret < 0) {
WOLFSSL_MSG("Failed to create RecipientInfo");
return ret;
}
}
recipSz = wc_PKCS7_GetRecipientListSize(pkcs7);
if (recipSz < 0) {
return ret;
} else if (recipSz == 0) {
WOLFSSL_MSG("You must add at least one CMS recipient");
return PKCS7_RECIP_E;
}
recipSetSz = SetSet(recipSz, recipSet);
/* generate random nonce and IV for encryption */
switch (pkcs7->encryptOID) {
#ifdef HAVE_AESGCM
#ifdef WOLFSSL_AES_128
case AES128GCMb:
FALL_THROUGH;
#endif
#ifdef WOLFSSL_AES_192
case AES192GCMb:
FALL_THROUGH;
#endif
#ifdef WOLFSSL_AES_256
case AES256GCMb:
#endif
#if defined(WOLFSSL_AES_128) || defined(WOLFSSL_AES_192) || \
defined(WOLFSSL_AES_256)
/* GCM nonce is GCM_NONCE_MID_SZ (12) */
nonceSz = GCM_NONCE_MID_SZ;
break;
#endif
#endif /* HAVE_AESGCM */
#ifdef HAVE_AESCCM
#ifdef WOLFSSL_AES_128
case AES128CCMb:
FALL_THROUGH;
#endif
#ifdef WOLFSSL_AES_192
case AES192CCMb:
FALL_THROUGH;
#endif
#ifdef WOLFSSL_AES_256
case AES256CCMb:
#endif
#if defined(WOLFSSL_AES_128) || defined(WOLFSSL_AES_192) || \
defined(WOLFSSL_AES_256)
/* CCM nonce is CCM_NONCE_MIN_SZ (7) */
nonceSz = CCM_NONCE_MIN_SZ;
break;
#endif
#endif /* HAVE_AESCCM */
}
ret = wc_InitRng_ex(&rng, pkcs7->heap, pkcs7->devId);
if (ret != 0)
return ret;
ret = wc_PKCS7_GenerateBlock(pkcs7, &rng, nonce, nonceSz);
wc_FreeRng(&rng);
if (ret != 0) {
return ret;
}
/* authAttribs: add contentType attrib if needed */
if (pkcs7->contentOID != DATA) {
/* if type is not id-data, contentType attribute MUST be added */
contentTypeAttrib.oid = contentTypeOid;
contentTypeAttrib.oidSz = sizeof(contentTypeOid);
/* try to set from contentOID first, known types */
ret = wc_SetContentType(pkcs7->contentOID, contentTypeValue,
sizeof(contentTypeValue));
if (ret > 0) {
contentTypeAttrib.value = contentTypeValue;
contentTypeAttrib.valueSz = ret;
/* otherwise, try to set from custom content type */
} else if (ret <= 0) {
if (pkcs7->contentTypeSz == 0) {
WOLFSSL_MSG("CMS pkcs7->contentType must be set if "
"contentOID is not");
return BAD_FUNC_ARG;
}
contentTypeAttrib.value = pkcs7->contentType;
contentTypeAttrib.valueSz = pkcs7->contentTypeSz;
}
authAttribsSz += EncodeAttributes(authAttribs, 1,
&contentTypeAttrib, 1);
authAttribsCount += 1;
}
/* authAttribs: add in user authenticated attributes */
if (pkcs7->authAttribs != NULL && pkcs7->authAttribsSz > 0) {
authAttribsSz += EncodeAttributes(authAttribs + authAttribsCount,
MAX_AUTH_ATTRIBS_SZ - authAttribsCount,
pkcs7->authAttribs,
pkcs7->authAttribsSz);
authAttribsCount += pkcs7->authAttribsSz;
}
/* authAttribs: flatten authAttribs */
if (authAttribsSz > 0 && authAttribsCount > 0) {
flatAuthAttribs = (byte*)XMALLOC(authAttribsSz, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (flatAuthAttribs == NULL) {
return MEMORY_E;
}
FlattenAttributes(flatAuthAttribs, authAttribs, authAttribsCount);
authAttribsSetSz = SetImplicit(ASN_SET, 1, authAttribsSz,
authAttribSet);
/* From RFC5083, "For the purpose of constructing the AAD, the
* IMPLICIT [1] tag in the authAttrs field is not used for the
* DER encoding: rather a universal SET OF tag is used. */
authAttribsAadSetSz = SetSet(authAttribsSz, authAttribAadSet);
/* allocate temp buffer to hold alternate attrib encoding for aad */
aadBuffer = (byte*)XMALLOC(authAttribsSz + authAttribsAadSetSz,
pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
if (aadBuffer == NULL) {
XFREE(flatAuthAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return MEMORY_E;
}
/* build up alternate attrib encoding for aad */
aadBufferSz = 0;
XMEMCPY(aadBuffer + aadBufferSz, authAttribAadSet, authAttribsAadSetSz);
aadBufferSz += authAttribsAadSetSz;
XMEMCPY(aadBuffer + aadBufferSz, flatAuthAttribs, authAttribsSz);
aadBufferSz += authAttribsSz;
}
/* build up unauthenticated attributes (unauthAttrs) */
if (pkcs7->unauthAttribsSz > 0) {
unauthAttribsSz = EncodeAttributes(unauthAttribs + unauthAttribsCount,
MAX_UNAUTH_ATTRIBS_SZ - unauthAttribsCount,
pkcs7->unauthAttribs,
pkcs7->unauthAttribsSz);
unauthAttribsCount = pkcs7->unauthAttribsSz;
flatUnauthAttribs = (byte*)XMALLOC(unauthAttribsSz, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (flatUnauthAttribs == NULL) {
if (aadBuffer)
XFREE(aadBuffer, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
if (flatAuthAttribs)
XFREE(flatAuthAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return MEMORY_E;
}
FlattenAttributes(flatUnauthAttribs, unauthAttribs, unauthAttribsCount);
unauthAttribsSetSz = SetImplicit(ASN_SET, 2, unauthAttribsSz,
unauthAttribSet);
}
/* allocate encrypted content buffer */
encryptedOutSz = pkcs7->contentSz;
encryptedContent = (byte*)XMALLOC(encryptedOutSz, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (encryptedContent == NULL) {
if (aadBuffer)
XFREE(aadBuffer, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
if (flatUnauthAttribs)
XFREE(flatUnauthAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (flatAuthAttribs)
XFREE(flatAuthAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return MEMORY_E;
}
/* encrypt content */
ret = wc_PKCS7_EncryptContent(pkcs7->encryptOID, pkcs7->cek,
pkcs7->cekSz, nonce, nonceSz, aadBuffer, aadBufferSz, authTag,
sizeof(authTag), pkcs7->content, encryptedOutSz, encryptedContent);
if (aadBuffer) {
XFREE(aadBuffer, pkcs7->heap, DYNAMIC_TYPE_TMP_BUFFER);
aadBuffer = NULL;
}
if (ret != 0) {
if (flatUnauthAttribs)
XFREE(flatUnauthAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (flatAuthAttribs)
XFREE(flatAuthAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
/* EncryptedContentInfo */
ret = wc_SetContentType(pkcs7->contentOID, contentType,
sizeof(contentType));
if (ret < 0) {
if (flatUnauthAttribs)
XFREE(flatUnauthAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (flatAuthAttribs)
XFREE(flatAuthAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
contentTypeSz = ret;
/* put together nonce OCTET STRING */
nonceOctetStringSz = SetOctetString(nonceSz, nonceOctetString);
/* put together aes-ICVlen INTEGER */
macIntSz = SetMyVersion(sizeof(authTag), macInt, 0);
/* build up our ContentEncryptionAlgorithmIdentifier sequence,
* adding (nonceOctetStringSz + blockSz + macIntSz) for nonce OCTET STRING
* and tag size */
contentEncAlgoSz = SetAlgoID(pkcs7->encryptOID, contentEncAlgo,
oidBlkType, nonceOctetStringSz + nonceSz +
macIntSz);
if (contentEncAlgoSz == 0) {
if (flatUnauthAttribs)
XFREE(flatUnauthAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (flatAuthAttribs)
XFREE(flatAuthAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return BAD_FUNC_ARG;
}
encContentOctetSz = SetImplicit(ASN_OCTET_STRING, 0, encryptedOutSz,
encContentOctet);
encContentSeqSz = SetSequence(contentTypeSz + contentEncAlgoSz +
nonceOctetStringSz + nonceSz + macIntSz +
encContentOctetSz + encryptedOutSz,
encContentSeq);
macOctetStringSz = SetOctetString(sizeof(authTag), macOctetString);
/* keep track of sizes for outer wrapper layering */
totalSz = verSz + recipSetSz + recipSz + encContentSeqSz + contentTypeSz +
contentEncAlgoSz + nonceOctetStringSz + nonceSz + macIntSz +
encContentOctetSz + encryptedOutSz + authAttribsSz +
authAttribsSetSz + macOctetStringSz + sizeof(authTag) +
unauthAttribsSz + unauthAttribsSetSz;
/* EnvelopedData */
envDataSeqSz = SetSequence(totalSz, envDataSeq);
totalSz += envDataSeqSz;
/* outer content */
outerContentSz = SetExplicit(0, totalSz, outerContent);
totalSz += outerContentTypeSz;
totalSz += outerContentSz;
/* ContentInfo */
contentInfoSeqSz = SetSequence(totalSz, contentInfoSeq);
totalSz += contentInfoSeqSz;
if (totalSz > (int)outputSz) {
WOLFSSL_MSG("Pkcs7_encrypt output buffer too small");
if (flatUnauthAttribs)
XFREE(flatUnauthAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (flatAuthAttribs)
XFREE(flatAuthAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return BUFFER_E;
}
XMEMCPY(output + idx, contentInfoSeq, contentInfoSeqSz);
idx += contentInfoSeqSz;
XMEMCPY(output + idx, outerContentType, outerContentTypeSz);
idx += outerContentTypeSz;
XMEMCPY(output + idx, outerContent, outerContentSz);
idx += outerContentSz;
XMEMCPY(output + idx, envDataSeq, envDataSeqSz);
idx += envDataSeqSz;
XMEMCPY(output + idx, ver, verSz);
idx += verSz;
XMEMCPY(output + idx, recipSet, recipSetSz);
idx += recipSetSz;
/* copy in recipients from list */
tmpRecip = pkcs7->recipList;
while (tmpRecip != NULL) {
XMEMCPY(output + idx, tmpRecip->recip, tmpRecip->recipSz);
idx += tmpRecip->recipSz;
tmpRecip = tmpRecip->next;
}
wc_PKCS7_FreeEncodedRecipientSet(pkcs7);
XMEMCPY(output + idx, encContentSeq, encContentSeqSz);
idx += encContentSeqSz;
XMEMCPY(output + idx, contentType, contentTypeSz);
idx += contentTypeSz;
XMEMCPY(output + idx, contentEncAlgo, contentEncAlgoSz);
idx += contentEncAlgoSz;
XMEMCPY(output + idx, nonceOctetString, nonceOctetStringSz);
idx += nonceOctetStringSz;
XMEMCPY(output + idx, nonce, nonceSz);
idx += nonceSz;
XMEMCPY(output + idx, macInt, macIntSz);
idx += macIntSz;
XMEMCPY(output + idx, encContentOctet, encContentOctetSz);
idx += encContentOctetSz;
XMEMCPY(output + idx, encryptedContent, encryptedOutSz);
idx += encryptedOutSz;
/* authenticated attributes */
if (flatAuthAttribs && authAttribsSz > 0) {
XMEMCPY(output + idx, authAttribSet, authAttribsSetSz);
idx += authAttribsSetSz;
XMEMCPY(output + idx, flatAuthAttribs, authAttribsSz);
idx += authAttribsSz;
XFREE(flatAuthAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
}
XMEMCPY(output + idx, macOctetString, macOctetStringSz);
idx += macOctetStringSz;
XMEMCPY(output + idx, authTag, sizeof(authTag));
idx += sizeof(authTag);
/* unauthenticated attributes */
if (unauthAttribsSz > 0) {
XMEMCPY(output + idx, unauthAttribSet, unauthAttribsSetSz);
idx += unauthAttribsSetSz;
XMEMCPY(output + idx, flatUnauthAttribs, unauthAttribsSz);
idx += unauthAttribsSz;
XFREE(flatUnauthAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
}
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return idx;
#else
WOLFSSL_MSG("AuthEnvelopedData requires AES-GCM or AES-CCM to be enabled");
(void)pkcs7;
(void)output;
(void)outputSz;
return NOT_COMPILED_IN;
#endif /* HAVE_AESGCM | HAVE_AESCCM */
}
/* unwrap and decrypt PKCS#7 AuthEnvelopedData object, return decoded size */
WOLFSSL_API int wc_PKCS7_DecodeAuthEnvelopedData(PKCS7* pkcs7, byte* in,
word32 inSz, byte* output,
word32 outputSz)
{
#if defined(HAVE_AESGCM) || defined(HAVE_AESCC)
int recipFound = 0;
int ret = 0, length;
word32 idx = 0;
#ifndef NO_PKCS7_STREAM
word32 tmpIdx = 0;
long rc;
#endif
word32 contentType, encOID = 0;
word32 decryptedKeySz = 0;
byte* pkiMsg = in;
word32 pkiMsgSz = inSz;
int expBlockSz = 0, blockKeySz = 0;
byte authTag[AES_BLOCK_SIZE];
byte nonce[GCM_NONCE_MID_SZ]; /* GCM nonce is larger than CCM */
int nonceSz = 0, authTagSz = 0, macSz = 0;
#ifdef WOLFSSL_SMALL_STACK
byte* decryptedKey = NULL;
#else
byte decryptedKey[MAX_ENCRYPTED_KEY_SZ];
#endif
int encryptedContentSz = 0;
byte* encryptedContent = NULL;
int explicitOctet = 0;
byte authAttribSetByte = 0;
byte* encodedAttribs = NULL;
word32 encodedAttribIdx = 0, encodedAttribSz = 0;
byte* authAttrib = NULL;
int authAttribSz = 0;
if (pkcs7 == NULL)
return BAD_FUNC_ARG;
if (pkiMsg == NULL || pkiMsgSz == 0 ||
output == NULL || outputSz == 0)
return BAD_FUNC_ARG;
#ifndef NO_PKCS7_STREAM
if (pkcs7->stream == NULL) {
if ((ret = wc_PKCS7_CreateStream(pkcs7)) != 0) {
return ret;
}
}
#endif
switch (pkcs7->state) {
case WC_PKCS7_START:
case WC_PKCS7_INFOSET_START:
case WC_PKCS7_INFOSET_STAGE1:
case WC_PKCS7_INFOSET_STAGE2:
case WC_PKCS7_INFOSET_END:
ret = wc_PKCS7_ParseToRecipientInfoSet(pkcs7, pkiMsg, pkiMsgSz,
&idx, AUTH_ENVELOPED_DATA);
if (ret < 0)
break;
#ifndef NO_PKCS7_STREAM
tmpIdx = idx;
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_AUTHENV_2);
FALL_THROUGH;
case WC_PKCS7_AUTHENV_2:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz, MAX_LENGTH_SZ +
MAX_VERSION_SZ + ASN_TAG_SZ, &pkiMsg, &idx)) != 0) {
break;
}
#endif
#ifdef WOLFSSL_SMALL_STACK
decryptedKey = (byte*)XMALLOC(MAX_ENCRYPTED_KEY_SZ, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (decryptedKey == NULL) {
ret = MEMORY_E;
break;
}
#ifndef NO_PKCS7_STREAM
pkcs7->stream->key = decryptedKey;
#endif
#endif
FALL_THROUGH;
case WC_PKCS7_DECRYPT_KTRI:
case WC_PKCS7_DECRYPT_KTRI_2:
case WC_PKCS7_DECRYPT_KTRI_3:
case WC_PKCS7_DECRYPT_KARI:
case WC_PKCS7_DECRYPT_KEKRI:
case WC_PKCS7_DECRYPT_PWRI:
case WC_PKCS7_DECRYPT_ORI:
decryptedKeySz = MAX_ENCRYPTED_KEY_SZ;
#ifdef WOLFSSL_SMALL_STACK
#ifndef NO_PKCS7_STREAM
decryptedKey = pkcs7->stream->key;
#endif
#endif
ret = wc_PKCS7_DecryptRecipientInfos(pkcs7, in, inSz, &idx,
decryptedKey, &decryptedKeySz,
&recipFound);
if (ret != 0) {
break;
}
if (recipFound == 0) {
WOLFSSL_MSG("No recipient found in envelopedData that matches input");
ret = PKCS7_RECIP_E;
break;
}
#ifndef NO_PKCS7_STREAM
tmpIdx = idx;
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_AUTHENV_3);
FALL_THROUGH;
case WC_PKCS7_AUTHENV_3:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz, MAX_SEQ_SZ +
MAX_ALGO_SZ + MAX_ALGO_SZ + ASN_TAG_SZ,
&pkiMsg, &idx)) != 0) {
break;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK,
in, inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
#endif
/* remove EncryptedContentInfo */
if (ret == 0 && GetSequence(pkiMsg, &idx, &length, pkiMsgSz) < 0) {
ret = ASN_PARSE_E;
}
if (ret == 0 && wc_GetContentType(pkiMsg, &idx, &contentType,
pkiMsgSz) < 0) {
ret = ASN_PARSE_E;
}
if (ret == 0 && GetAlgoId(pkiMsg, &idx, &encOID, oidBlkType,
pkiMsgSz) < 0) {
ret = ASN_PARSE_E;
}
blockKeySz = wc_PKCS7_GetOIDKeySize(encOID);
if (ret == 0 && blockKeySz < 0) {
ret = blockKeySz;
}
expBlockSz = wc_PKCS7_GetOIDBlockSize(encOID);
if (ret == 0 && expBlockSz < 0) {
ret = expBlockSz;
}
/* get nonce, stored in OPTIONAL parameter of AlgoID */
if (ret == 0 && pkiMsg[idx++] != ASN_OCTET_STRING) {
ret = ASN_PARSE_E;
}
if (ret < 0)
break;
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, &idx)) != 0) {
break;
}
wc_PKCS7_StreamStoreVar(pkcs7, encOID, blockKeySz, 0);
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_AUTHENV_4);
FALL_THROUGH;
case WC_PKCS7_AUTHENV_4:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz, MAX_LENGTH_SZ +
MAX_VERSION_SZ + ASN_TAG_SZ + MAX_LENGTH_SZ,
&pkiMsg, &idx)) != 0) {
break;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK, in,
inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
#endif
if (ret == 0 && GetLength(pkiMsg, &idx, &nonceSz, pkiMsgSz) < 0) {
ret = ASN_PARSE_E;
}
if (ret == 0 && nonceSz > (int)sizeof(nonce)) {
WOLFSSL_MSG("AuthEnvelopedData nonce too large for buffer");
ret = ASN_PARSE_E;
}
if (ret == 0) {
XMEMCPY(nonce, &pkiMsg[idx], nonceSz);
idx += nonceSz;
}
/* get mac size, also stored in OPTIONAL parameter of AlgoID */
if (ret == 0 && GetMyVersion(pkiMsg, &idx, &macSz, pkiMsgSz) < 0) {
ret = ASN_PARSE_E;
}
if (ret == 0) {
explicitOctet = pkiMsg[idx] ==
(ASN_CONTEXT_SPECIFIC | ASN_CONSTRUCTED | 0);
}
/* read encryptedContent, cont[0] */
if (ret == 0 && pkiMsg[idx] != (ASN_CONTEXT_SPECIFIC | 0) &&
pkiMsg[idx] != (ASN_CONTEXT_SPECIFIC | ASN_CONSTRUCTED | 0)) {
ret = ASN_PARSE_E;
}
idx++;
if (ret == 0 && GetLength(pkiMsg, &idx, &encryptedContentSz,
pkiMsgSz) <= 0) {
ret = ASN_PARSE_E;
}
if (explicitOctet) {
if (ret == 0 && pkiMsg[idx++] != ASN_OCTET_STRING) {
ret = ASN_PARSE_E;
}
if (ret == 0 && GetLength(pkiMsg, &idx, &encryptedContentSz,
pkiMsgSz) <= 0) {
ret = ASN_PARSE_E;
}
}
if (ret < 0)
break;
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, &idx)) != 0) {
break;
}
/* store nonce for later */
if (nonceSz > 0) {
pkcs7->stream->nonceSz = nonceSz;
pkcs7->stream->nonce = (byte*)XMALLOC(nonceSz, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (pkcs7->stream->nonce == NULL) {
ret = MEMORY_E;
break;
}
else {
XMEMCPY(pkcs7->stream->nonce, nonce, nonceSz);
}
}
pkcs7->stream->expected = encryptedContentSz;
wc_PKCS7_StreamStoreVar(pkcs7, encOID, blockKeySz,
encryptedContentSz);
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_AUTHENV_5);
FALL_THROUGH;
case WC_PKCS7_AUTHENV_5:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz, MAX_LENGTH_SZ +
ASN_TAG_SZ + ASN_TAG_SZ + pkcs7->stream->expected,
&pkiMsg, &idx)) != 0) {
break;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK, in,
inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
encryptedContentSz = pkcs7->stream->expected;
#endif
encryptedContent = (byte*)XMALLOC(encryptedContentSz, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (ret == 0 && encryptedContent == NULL) {
ret = MEMORY_E;
}
if (ret == 0) {
XMEMCPY(encryptedContent, &pkiMsg[idx], encryptedContentSz);
idx += encryptedContentSz;
}
#ifndef NO_PKCS7_STREAM
pkcs7->stream->bufferPt = encryptedContent;
#endif
/* may have IMPLICIT [1] authenticatedAttributes */
if (ret == 0 && pkiMsg[idx] ==
(ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC | 1)) {
encodedAttribIdx = idx;
encodedAttribs = pkiMsg + idx;
idx++;
if (ret == 0 && GetLength(pkiMsg, &idx, &length, pkiMsgSz) < 0)
ret = ASN_PARSE_E;
#ifndef NO_PKCS7_STREAM
pkcs7->stream->expected = length;
#endif
encodedAttribSz = length + (idx - encodedAttribIdx);
if (ret != 0)
break;
#ifndef NO_PKCS7_STREAM
if (encodedAttribSz > 0) {
pkcs7->stream->aadSz = encodedAttribSz;
pkcs7->stream->aad = (byte*)XMALLOC(encodedAttribSz,
pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (pkcs7->stream->aad == NULL) {
ret = MEMORY_E;
break;
}
else {
XMEMCPY(pkcs7->stream->aad, encodedAttribs,
(idx - encodedAttribIdx));
}
}
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, &idx)) != 0) {
break;
}
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_AUTHENV_ATRB);
}
else {
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, &idx)) != 0) {
break;
}
#endif
goto authenv_atrbend; /* jump over attribute cases */
}
FALL_THROUGH;
case WC_PKCS7_AUTHENV_ATRB:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz,
pkcs7->stream->expected, &pkiMsg, &idx)) != 0) {
return ret;
}
length = pkcs7->stream->expected;
encodedAttribs = pkcs7->stream->aad;
#else
length = 0;
#endif
/* save pointer and length */
authAttrib = &pkiMsg[idx];
authAttribSz = length;
if (ret == 0 && wc_PKCS7_ParseAttribs(pkcs7, authAttrib, authAttribSz) < 0) {
WOLFSSL_MSG("Error parsing authenticated attributes");
ret = ASN_PARSE_E;
break;
}
idx += length;
#ifndef NO_PKCS7_STREAM
if (encodedAttribSz > 0) {
XMEMCPY(pkcs7->stream->aad + (encodedAttribSz - length),
authAttrib, authAttribSz);
}
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, &idx)) != 0) {
break;
}
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_AUTHENV_ATRBEND);
FALL_THROUGH;
authenv_atrbend:
case WC_PKCS7_AUTHENV_ATRBEND:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz, MAX_LENGTH_SZ +
ASN_TAG_SZ, &pkiMsg, &idx)) != 0) {
return ret;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK,
in, inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
if (pkcs7->stream->aadSz > 0) {
encodedAttribSz = pkcs7->stream->aadSz;
encodedAttribs = pkcs7->stream->aad;
}
#endif
/* get authTag OCTET STRING */
if (ret == 0 && pkiMsg[idx++] != ASN_OCTET_STRING) {
ret = ASN_PARSE_E;
}
if (ret == 0 && GetLength(pkiMsg, &idx, &authTagSz, pkiMsgSz) < 0) {
ret = ASN_PARSE_E;
}
if (ret == 0 && authTagSz > (int)sizeof(authTag)) {
WOLFSSL_MSG("AuthEnvelopedData authTag too large for buffer");
ret = ASN_PARSE_E;
}
if (ret == 0) {
XMEMCPY(authTag, &pkiMsg[idx], authTagSz);
idx += authTagSz;
}
if (ret == 0 && authAttrib != NULL) {
/* temporarily swap authAttribs byte[0] to SET OF instead of
* IMPLICIT [1], for aad calculation */
authAttribSetByte = encodedAttribs[0];
encodedAttribs[0] = ASN_SET | ASN_CONSTRUCTED;
}
if (ret < 0)
break;
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, &idx)) != 0) {
break;
}
pkcs7->stream->expected = (pkcs7->stream->maxLen -
pkcs7->stream->totalRd) + pkcs7->stream->length;
/* store tag for later */
if (authTagSz > 0) {
pkcs7->stream->tagSz = authTagSz;
pkcs7->stream->tag = (byte*)XMALLOC(authTagSz, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (pkcs7->stream->tag == NULL) {
ret = MEMORY_E;
break;
}
else {
XMEMCPY(pkcs7->stream->tag, authTag, authTagSz);
}
}
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_AUTHENV_6);
FALL_THROUGH;
case WC_PKCS7_AUTHENV_6:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz,
pkcs7->stream->expected, &pkiMsg, &idx)) != 0) {
break;
}
/* restore all variables needed */
if (pkcs7->stream->nonceSz > 0) {
nonceSz = pkcs7->stream->nonceSz;
if (nonceSz > GCM_NONCE_MID_SZ) {
WOLFSSL_MSG("PKCS7 saved nonce is too large");
ret = BUFFER_E;
break;
}
else {
XMEMCPY(nonce, pkcs7->stream->nonce, nonceSz);
}
}
if (pkcs7->stream->tagSz > 0) {
authTagSz = pkcs7->stream->tagSz;
if (authTagSz > AES_BLOCK_SIZE) {
WOLFSSL_MSG("PKCS7 saved tag is too large");
ret = BUFFER_E;
break;
}
else {
XMEMCPY(authTag, pkcs7->stream->tag, authTagSz);
}
}
if (pkcs7->stream->aadSz > 0) {
encodedAttribSz = pkcs7->stream->aadSz;
encodedAttribs = pkcs7->stream->aad;
}
wc_PKCS7_StreamGetVar(pkcs7, &encOID, &blockKeySz, &encryptedContentSz);
encryptedContent = pkcs7->stream->bufferPt;
#ifdef WOLFSSL_SMALL_STACK
decryptedKey = pkcs7->stream->key;
#endif
#endif
/* decrypt encryptedContent */
ret = wc_PKCS7_DecryptContent(encOID, decryptedKey, blockKeySz,
nonce, nonceSz, encodedAttribs,
encodedAttribSz, authTag, authTagSz,
encryptedContent, encryptedContentSz,
encryptedContent);
if (ret != 0) {
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
if (authAttrib != NULL) {
/* restore authAttrib IMPLICIT [1] */
encodedAttribs[0] = authAttribSetByte;
}
/* copy plaintext to output */
XMEMCPY(output, encryptedContent, encryptedContentSz);
/* free memory, zero out keys */
ForceZero(encryptedContent, encryptedContentSz);
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
ForceZero(decryptedKey, MAX_ENCRYPTED_KEY_SZ);
#ifdef WOLFSSL_SMALL_STACK
XFREE(decryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
decryptedKey = NULL;
#ifdef WOLFSSL_SMALL_STACK
pkcs7->stream->key = NULL;
#endif
#endif
ret = encryptedContentSz;
#ifndef NO_PKCS7_STREAM
wc_PKCS7_ResetStream(pkcs7);
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_START);
break;
default:
WOLFSSL_MSG("Unknown PKCS7 state");
ret = BAD_FUNC_ARG;
}
#ifdef WOLFSSL_SMALL_STACK
if (ret != 0 && ret != WC_PKCS7_WANT_READ_E) {
if (decryptedKey != NULL) {
ForceZero(decryptedKey, MAX_ENCRYPTED_KEY_SZ);
}
XFREE(decryptedKey, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
}
#endif
#ifndef NO_PKCS7_STREAM
if (ret != 0 && ret != WC_PKCS7_WANT_READ_E) {
wc_PKCS7_ResetStream(pkcs7);
}
#endif
return ret;
#else
WOLFSSL_MSG("AuthEnvelopedData requires AES-GCM or AES-CCM to be enabled");
(void)pkcs7;
(void)in;
(void)inSz;
(void)output;
(void)outputSz;
return NOT_COMPILED_IN;
#endif /* HAVE_AESGCM | HAVE_AESCCM */
}
#ifndef NO_PKCS7_ENCRYPTED_DATA
/* build PKCS#7 encryptedData content type, return encrypted size */
int wc_PKCS7_EncodeEncryptedData(PKCS7* pkcs7, byte* output, word32 outputSz)
{
int ret, idx = 0;
int totalSz, padSz, encryptedOutSz;
int contentInfoSeqSz, outerContentTypeSz, outerContentSz;
byte contentInfoSeq[MAX_SEQ_SZ];
byte outerContentType[MAX_ALGO_SZ];
byte outerContent[MAX_SEQ_SZ];
int encDataSeqSz, verSz, blockSz;
byte encDataSeq[MAX_SEQ_SZ];
byte ver[MAX_VERSION_SZ];
byte* plain = NULL;
byte* encryptedContent = NULL;
int encContentOctetSz, encContentSeqSz, contentTypeSz;
int contentEncAlgoSz, ivOctetStringSz;
byte encContentSeq[MAX_SEQ_SZ];
byte contentType[MAX_OID_SZ];
byte contentEncAlgo[MAX_ALGO_SZ];
byte tmpIv[MAX_CONTENT_IV_SIZE];
byte ivOctetString[MAX_OCTET_STR_SZ];
byte encContentOctet[MAX_OCTET_STR_SZ];
byte attribSet[MAX_SET_SZ];
EncodedAttrib* attribs = NULL;
word32 attribsSz;
word32 attribsCount;
word32 attribsSetSz;
byte* flatAttribs = NULL;
if (pkcs7 == NULL || pkcs7->content == NULL || pkcs7->contentSz == 0 ||
pkcs7->encryptOID == 0 || pkcs7->encryptionKey == NULL ||
pkcs7->encryptionKeySz == 0)
return BAD_FUNC_ARG;
if (output == NULL || outputSz == 0)
return BAD_FUNC_ARG;
/* outer content type */
ret = wc_SetContentType(ENCRYPTED_DATA, outerContentType,
sizeof(outerContentType));
if (ret < 0)
return ret;
outerContentTypeSz = ret;
/* version, 2 if unprotectedAttrs present, 0 if absent */
if (pkcs7->unprotectedAttribsSz > 0) {
verSz = SetMyVersion(2, ver, 0);
} else {
verSz = SetMyVersion(0, ver, 0);
}
/* EncryptedContentInfo */
ret = wc_SetContentType(pkcs7->contentOID, contentType,
sizeof(contentType));
if (ret < 0)
return ret;
contentTypeSz = ret;
/* allocate encrypted content buffer, do PKCS#7 padding */
blockSz = wc_PKCS7_GetOIDBlockSize(pkcs7->encryptOID);
if (blockSz < 0)
return blockSz;
padSz = wc_PKCS7_GetPadSize(pkcs7->contentSz, blockSz);
if (padSz < 0)
return padSz;
encryptedOutSz = pkcs7->contentSz + padSz;
plain = (byte*)XMALLOC(encryptedOutSz, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (plain == NULL)
return MEMORY_E;
ret = wc_PKCS7_PadData(pkcs7->content, pkcs7->contentSz, plain,
encryptedOutSz, blockSz);
if (ret < 0) {
XFREE(plain, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
encryptedContent = (byte*)XMALLOC(encryptedOutSz, pkcs7->heap,
DYNAMIC_TYPE_PKCS7);
if (encryptedContent == NULL) {
XFREE(plain, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return MEMORY_E;
}
/* put together IV OCTET STRING */
ivOctetStringSz = SetOctetString(blockSz, ivOctetString);
/* build up ContentEncryptionAlgorithmIdentifier sequence,
adding (ivOctetStringSz + blockSz) for IV OCTET STRING */
contentEncAlgoSz = SetAlgoID(pkcs7->encryptOID, contentEncAlgo,
oidBlkType, ivOctetStringSz + blockSz);
if (contentEncAlgoSz == 0) {
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(plain, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return BAD_FUNC_ARG;
}
/* encrypt content */
ret = wc_PKCS7_GenerateBlock(pkcs7, NULL, tmpIv, blockSz);
if (ret != 0) {
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(plain, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
ret = wc_PKCS7_EncryptContent(pkcs7->encryptOID, pkcs7->encryptionKey,
pkcs7->encryptionKeySz, tmpIv, blockSz, NULL, 0, NULL, 0,
plain, encryptedOutSz, encryptedContent);
if (ret != 0) {
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(plain, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
encContentOctetSz = SetImplicit(ASN_OCTET_STRING, 0,
encryptedOutSz, encContentOctet);
encContentSeqSz = SetSequence(contentTypeSz + contentEncAlgoSz +
ivOctetStringSz + blockSz +
encContentOctetSz + encryptedOutSz,
encContentSeq);
/* optional UnprotectedAttributes */
if (pkcs7->unprotectedAttribsSz != 0) {
if (pkcs7->unprotectedAttribs == NULL) {
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(plain, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return BAD_FUNC_ARG;
}
attribs = (EncodedAttrib*)XMALLOC(
sizeof(EncodedAttrib) * pkcs7->unprotectedAttribsSz,
pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (attribs == NULL) {
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(plain, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return MEMORY_E;
}
attribsCount = pkcs7->unprotectedAttribsSz;
attribsSz = EncodeAttributes(attribs, pkcs7->unprotectedAttribsSz,
pkcs7->unprotectedAttribs,
pkcs7->unprotectedAttribsSz);
flatAttribs = (byte*)XMALLOC(attribsSz, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (flatAttribs == NULL) {
XFREE(attribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(plain, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return MEMORY_E;
}
FlattenAttributes(flatAttribs, attribs, attribsCount);
attribsSetSz = SetImplicit(ASN_SET, 1, attribsSz, attribSet);
} else {
attribsSz = 0;
attribsSetSz = 0;
}
/* keep track of sizes for outer wrapper layering */
totalSz = verSz + encContentSeqSz + contentTypeSz + contentEncAlgoSz +
ivOctetStringSz + blockSz + encContentOctetSz + encryptedOutSz +
attribsSz + attribsSetSz;
/* EncryptedData */
encDataSeqSz = SetSequence(totalSz, encDataSeq);
totalSz += encDataSeqSz;
/* outer content */
outerContentSz = SetExplicit(0, totalSz, outerContent);
totalSz += outerContentTypeSz;
totalSz += outerContentSz;
/* ContentInfo */
contentInfoSeqSz = SetSequence(totalSz, contentInfoSeq);
totalSz += contentInfoSeqSz;
if (totalSz > (int)outputSz) {
WOLFSSL_MSG("PKCS#7 output buffer too small");
if (pkcs7->unprotectedAttribsSz != 0) {
XFREE(attribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(flatAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
}
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(plain, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return BUFFER_E;
}
XMEMCPY(output + idx, contentInfoSeq, contentInfoSeqSz);
idx += contentInfoSeqSz;
XMEMCPY(output + idx, outerContentType, outerContentTypeSz);
idx += outerContentTypeSz;
XMEMCPY(output + idx, outerContent, outerContentSz);
idx += outerContentSz;
XMEMCPY(output + idx, encDataSeq, encDataSeqSz);
idx += encDataSeqSz;
XMEMCPY(output + idx, ver, verSz);
idx += verSz;
XMEMCPY(output + idx, encContentSeq, encContentSeqSz);
idx += encContentSeqSz;
XMEMCPY(output + idx, contentType, contentTypeSz);
idx += contentTypeSz;
XMEMCPY(output + idx, contentEncAlgo, contentEncAlgoSz);
idx += contentEncAlgoSz;
XMEMCPY(output + idx, ivOctetString, ivOctetStringSz);
idx += ivOctetStringSz;
XMEMCPY(output + idx, tmpIv, blockSz);
idx += blockSz;
XMEMCPY(output + idx, encContentOctet, encContentOctetSz);
idx += encContentOctetSz;
XMEMCPY(output + idx, encryptedContent, encryptedOutSz);
idx += encryptedOutSz;
if (pkcs7->unprotectedAttribsSz != 0) {
XMEMCPY(output + idx, attribSet, attribsSetSz);
idx += attribsSetSz;
XMEMCPY(output + idx, flatAttribs, attribsSz);
idx += attribsSz;
XFREE(attribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(flatAttribs, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
}
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
XFREE(plain, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return idx;
}
/* decode and store unprotected attributes in PKCS7->decodedAttrib. Return
* 0 on success, negative on error. User must call wc_PKCS7_Free(). */
static int wc_PKCS7_DecodeUnprotectedAttributes(PKCS7* pkcs7, byte* pkiMsg,
word32 pkiMsgSz, word32* inOutIdx)
{
int ret, attribLen;
word32 idx;
if (pkcs7 == NULL || pkiMsg == NULL ||
pkiMsgSz == 0 || inOutIdx == NULL)
return BAD_FUNC_ARG;
idx = *inOutIdx;
if (pkiMsg[idx] != (ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC | 1))
return ASN_PARSE_E;
idx++;
if (GetLength(pkiMsg, &idx, &attribLen, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* loop through attributes */
if ((ret = wc_PKCS7_ParseAttribs(pkcs7, pkiMsg + idx, attribLen)) < 0) {
return ret;
}
*inOutIdx = idx;
return 0;
}
/* unwrap and decrypt PKCS#7/CMS encrypted-data object, returned decoded size */
int wc_PKCS7_DecodeEncryptedData(PKCS7* pkcs7, byte* in, word32 inSz,
byte* output, word32 outputSz)
{
int ret = 0, version, length = 0, haveAttribs = 0;
word32 idx = 0;
#ifndef NO_PKCS7_STREAM
word32 tmpIdx = 0;
long rc;
#endif
word32 contentType, encOID;
int expBlockSz = 0;
byte tmpIvBuf[MAX_CONTENT_IV_SIZE];
byte *tmpIv = tmpIvBuf;
int encryptedContentSz = 0;
byte padLen;
byte* encryptedContent = NULL;
byte* pkiMsg = in;
word32 pkiMsgSz = inSz;
if (pkcs7 == NULL || pkcs7->encryptionKey == NULL ||
pkcs7->encryptionKeySz == 0)
return BAD_FUNC_ARG;
if (pkiMsg == NULL || pkiMsgSz == 0 ||
output == NULL || outputSz == 0)
return BAD_FUNC_ARG;
#ifndef NO_PKCS7_STREAM
(void)tmpIv; /* help out static analysis */
if (pkcs7->stream == NULL) {
if ((ret = wc_PKCS7_CreateStream(pkcs7)) != 0) {
return ret;
}
}
#endif
switch (pkcs7->state) {
case WC_PKCS7_START:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz, MAX_SEQ_SZ +
MAX_ALGO_SZ, &pkiMsg, &idx)) != 0) {
return ret;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_SEQ_PEEK, in, inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
#endif
/* read past ContentInfo, verify type is encrypted-data */
if (GetSequence(pkiMsg, &idx, &length, pkiMsgSz) < 0)
ret = ASN_PARSE_E;
if (ret == 0 && wc_GetContentType(pkiMsg, &idx, &contentType,
pkiMsgSz) < 0)
ret = ASN_PARSE_E;
if (ret == 0 && contentType != ENCRYPTED_DATA) {
WOLFSSL_MSG("PKCS#7 input not of type EncryptedData");
ret = PKCS7_OID_E;
}
if (ret != 0) break;
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, &idx)) != 0) {
break;
}
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_STAGE2);
FALL_THROUGH;
/* end of stage 1 */
case WC_PKCS7_STAGE2:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz,
MAX_LENGTH_SZ + MAX_SEQ_SZ + ASN_TAG_SZ, &pkiMsg,
&idx)) != 0) {
return ret;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK, in,
inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
#endif
if (ret == 0 && pkiMsg[idx++] != (ASN_CONSTRUCTED |
ASN_CONTEXT_SPECIFIC | 0))
ret = ASN_PARSE_E;
if (ret == 0 && GetLength(pkiMsg, &idx, &length, pkiMsgSz) < 0)
ret = ASN_PARSE_E;
/* remove EncryptedData and version */
if (ret == 0 && GetSequence(pkiMsg, &idx, &length, pkiMsgSz) < 0)
ret = ASN_PARSE_E;
if (ret != 0) break;
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, &idx)) != 0) {
break;
}
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_STAGE3);
FALL_THROUGH;
/* end of stage 2 */
case WC_PKCS7_STAGE3:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz,
MAX_VERSION_SZ + MAX_SEQ_SZ + MAX_ALGO_SZ * 2,
&pkiMsg, &idx)) != 0) {
return ret;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK, in,
inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
#endif
/* get version, check later */
haveAttribs = 0;
if (ret == 0 && GetMyVersion(pkiMsg, &idx, &version, pkiMsgSz) < 0)
ret = ASN_PARSE_E;
/* remove EncryptedContentInfo */
if (ret == 0 && GetSequence(pkiMsg, &idx, &length, pkiMsgSz) < 0)
ret = ASN_PARSE_E;
if (ret == 0 && wc_GetContentType(pkiMsg, &idx, &contentType,
pkiMsgSz) < 0)
ret = ASN_PARSE_E;
if (ret == 0 && (ret = GetAlgoId(pkiMsg, &idx, &encOID, oidBlkType,
pkiMsgSz)) < 0)
ret = ASN_PARSE_E;
if (ret == 0 && (expBlockSz = wc_PKCS7_GetOIDBlockSize(encOID)) < 0)
ret = expBlockSz;
if (ret != 0) break;
#ifndef NO_PKCS7_STREAM
/* store expBlockSz for later */
pkcs7->stream->varOne = expBlockSz;
pkcs7->stream->varTwo = encOID;
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, &idx)) != 0) {
break;
}
/* store version for later */
pkcs7->stream->vers = version;
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_STAGE4);
FALL_THROUGH;
/* end of stage 3 */
/* get block cipher IV, stored in OPTIONAL parameter of AlgoID */
case WC_PKCS7_STAGE4:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz,
ASN_TAG_SZ + MAX_LENGTH_SZ, &pkiMsg, &idx)) != 0) {
return ret;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK, in,
inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
/* restore saved variables */
expBlockSz = pkcs7->stream->varOne;
#endif
if (ret == 0 && pkiMsg[idx++] != ASN_OCTET_STRING)
ret = ASN_PARSE_E;
if (ret == 0 && GetLength(pkiMsg, &idx, &length, pkiMsgSz) < 0)
ret = ASN_PARSE_E;
if (ret == 0 && length != expBlockSz) {
WOLFSSL_MSG("Incorrect IV length, must be of content alg block size");
ret = ASN_PARSE_E;
}
if (ret != 0) break;
#ifndef NO_PKCS7_STREAM
/* next chunk of data expected should have the IV */
pkcs7->stream->expected = length;
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, &idx)) != 0) {
break;
}
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_STAGE5);
FALL_THROUGH;
/* end of stage 4 */
case WC_PKCS7_STAGE5:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz,
pkcs7->stream->expected + ASN_TAG_SZ +
MAX_LENGTH_SZ, &pkiMsg, &idx)) != 0) {
return ret;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK, in,
inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
/* use IV buffer from stream structure */
tmpIv = pkcs7->stream->tmpIv;
length = pkcs7->stream->expected;
#endif
XMEMCPY(tmpIv, &pkiMsg[idx], length);
idx += length;
/* read encryptedContent, cont[0] */
if (ret == 0 && pkiMsg[idx++] != (ASN_CONTEXT_SPECIFIC | 0))
ret = ASN_PARSE_E;
if (ret == 0 && GetLength(pkiMsg, &idx, &encryptedContentSz,
pkiMsgSz) <= 0)
ret = ASN_PARSE_E;
if (ret < 0)
break;
#ifndef NO_PKCS7_STREAM
/* next chunk of data should contain encrypted content */
pkcs7->stream->varThree = encryptedContentSz;
if ((ret = wc_PKCS7_StreamEndCase(pkcs7, &tmpIdx, &idx)) != 0) {
break;
}
if (pkcs7->stream->totalRd + encryptedContentSz < pkiMsgSz) {
pkcs7->stream->flagOne = 1;
}
pkcs7->stream->expected = (pkcs7->stream->maxLen -
pkcs7->stream->totalRd) + pkcs7->stream->length;
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_STAGE6);
FALL_THROUGH;
/* end of stage 5 */
case WC_PKCS7_STAGE6:
#ifndef NO_PKCS7_STREAM
if ((ret = wc_PKCS7_AddDataToStream(pkcs7, in, inSz,
pkcs7->stream->expected, &pkiMsg, &idx)) != 0) {
return ret;
}
rc = wc_PKCS7_GetMaxStream(pkcs7, PKCS7_DEFAULT_PEEK, in,
inSz);
if (rc < 0) {
ret = (int)rc;
break;
}
pkiMsgSz = (word32)rc;
/* restore saved variables */
expBlockSz = pkcs7->stream->varOne;
encOID = pkcs7->stream->varTwo;
encryptedContentSz = pkcs7->stream->varThree;
version = pkcs7->stream->vers;
tmpIv = pkcs7->stream->tmpIv;
#else
encOID = 0;
#endif
if (ret == 0 && (encryptedContent = (byte*)XMALLOC(
encryptedContentSz, pkcs7->heap, DYNAMIC_TYPE_PKCS7)) == NULL)
ret = MEMORY_E;
if (ret == 0) {
XMEMCPY(encryptedContent, &pkiMsg[idx], encryptedContentSz);
idx += encryptedContentSz;
}
/* decrypt encryptedContent */
ret = wc_PKCS7_DecryptContent(encOID, pkcs7->encryptionKey,
pkcs7->encryptionKeySz, tmpIv, expBlockSz,
NULL, 0, NULL, 0, encryptedContent,
encryptedContentSz, encryptedContent);
if (ret != 0) {
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
}
if (ret == 0) {
padLen = encryptedContent[encryptedContentSz-1];
/* copy plaintext to output */
XMEMCPY(output, encryptedContent, encryptedContentSz - padLen);
/* get implicit[1] unprotected attributes, optional */
wc_PKCS7_FreeDecodedAttrib(pkcs7->decodedAttrib, pkcs7->heap);
pkcs7->decodedAttrib = NULL;
#ifndef NO_PKCS7_STREAM
if (pkcs7->stream->flagOne)
#else
if (idx < pkiMsgSz)
#endif
{
haveAttribs = 1;
ret = wc_PKCS7_DecodeUnprotectedAttributes(pkcs7, pkiMsg,
pkiMsgSz, &idx);
if (ret != 0) {
ForceZero(encryptedContent, encryptedContentSz);
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
ret = ASN_PARSE_E;
}
}
}
if (ret == 0) {
/* go back and check the version now that attribs have been processed */
if ((haveAttribs == 0 && version != 0) ||
(haveAttribs == 1 && version != 2) ) {
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
WOLFSSL_MSG("Wrong PKCS#7 EncryptedData version");
return ASN_VERSION_E;
}
ForceZero(encryptedContent, encryptedContentSz);
XFREE(encryptedContent, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
ret = encryptedContentSz - padLen;
}
if (ret != 0) break;
#ifndef NO_PKCS7_STREAM
wc_PKCS7_ResetStream(pkcs7);
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_START);
break;
default:
WOLFSSL_MSG("Error in unknown PKCS#7 Decode Encrypted Data state");
return BAD_STATE_E;
}
if (ret != 0) {
#ifndef NO_PKCS7_STREAM
/* restart in error case */
wc_PKCS7_ResetStream(pkcs7);
#endif
wc_PKCS7_ChangeState(pkcs7, WC_PKCS7_START);
}
return ret;
}
#endif /* NO_PKCS7_ENCRYPTED_DATA */
#if defined(HAVE_LIBZ) && !defined(NO_PKCS7_COMPRESSED_DATA)
/* build PKCS#7 compressedData content type, return encrypted size */
int wc_PKCS7_EncodeCompressedData(PKCS7* pkcs7, byte* output, word32 outputSz)
{
byte contentInfoSeq[MAX_SEQ_SZ];
byte contentInfoTypeOid[MAX_OID_SZ];
byte contentInfoContentSeq[MAX_SEQ_SZ]; /* EXPLICIT [0] */
byte compressedDataSeq[MAX_SEQ_SZ];
byte cmsVersion[MAX_VERSION_SZ];
byte compressAlgId[MAX_ALGO_SZ];
byte encapContentInfoSeq[MAX_SEQ_SZ];
byte contentTypeOid[MAX_OID_SZ];
byte contentSeq[MAX_SEQ_SZ]; /* EXPLICIT [0] */
byte contentOctetStr[MAX_OCTET_STR_SZ];
int ret;
word32 totalSz, idx;
word32 contentInfoSeqSz, contentInfoContentSeqSz, contentInfoTypeOidSz;
word32 compressedDataSeqSz, cmsVersionSz, compressAlgIdSz;
word32 encapContentInfoSeqSz, contentTypeOidSz, contentSeqSz;
word32 contentOctetStrSz;
byte* compressed;
word32 compressedSz;
if (pkcs7 == NULL || pkcs7->content == NULL || pkcs7->contentSz == 0 ||
output == NULL || outputSz == 0) {
return BAD_FUNC_ARG;
}
/* allocate space for compressed content. The libz code says the compressed
* buffer should be srcSz + 0.1% + 12. */
compressedSz = (pkcs7->contentSz + (word32)(pkcs7->contentSz * 0.001) + 12);
compressed = (byte*)XMALLOC(compressedSz, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (compressed == NULL) {
WOLFSSL_MSG("Error allocating memory for CMS compressed content");
return MEMORY_E;
}
/* compress content */
ret = wc_Compress(compressed, compressedSz, pkcs7->content,
pkcs7->contentSz, 0);
if (ret < 0) {
XFREE(compressed, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
compressedSz = (word32)ret;
/* eContent OCTET STRING, working backwards */
contentOctetStrSz = SetOctetString(compressedSz, contentOctetStr);
totalSz = contentOctetStrSz + compressedSz;
/* EXPLICIT [0] eContentType */
contentSeqSz = SetExplicit(0, totalSz, contentSeq);
totalSz += contentSeqSz;
/* eContentType OBJECT IDENTIFIER */
ret = wc_SetContentType(pkcs7->contentOID, contentTypeOid,
sizeof(contentTypeOid));
if (ret < 0) {
XFREE(compressed, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
contentTypeOidSz = ret;
totalSz += contentTypeOidSz;
/* EncapsulatedContentInfo SEQUENCE */
encapContentInfoSeqSz = SetSequence(totalSz, encapContentInfoSeq);
totalSz += encapContentInfoSeqSz;
/* compressionAlgorithm AlgorithmIdentifier */
/* Only supports zlib for compression currently:
* id-alg-zlibCompress (1.2.840.113549.1.9.16.3.8) */
compressAlgIdSz = SetAlgoID(ZLIBc, compressAlgId, oidCompressType, 0);
totalSz += compressAlgIdSz;
/* version */
cmsVersionSz = SetMyVersion(0, cmsVersion, 0);
totalSz += cmsVersionSz;
/* CompressedData SEQUENCE */
compressedDataSeqSz = SetSequence(totalSz, compressedDataSeq);
totalSz += compressedDataSeqSz;
/* ContentInfo content EXPLICIT SEQUENCE */
contentInfoContentSeqSz = SetExplicit(0, totalSz, contentInfoContentSeq);
totalSz += contentInfoContentSeqSz;
/* ContentInfo ContentType (compressedData) */
ret = wc_SetContentType(COMPRESSED_DATA, contentInfoTypeOid,
sizeof(contentInfoTypeOid));
if (ret < 0) {
XFREE(compressed, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
contentInfoTypeOidSz = ret;
totalSz += contentInfoTypeOidSz;
/* ContentInfo SEQUENCE */
contentInfoSeqSz = SetSequence(totalSz, contentInfoSeq);
totalSz += contentInfoSeqSz;
if (outputSz < totalSz) {
XFREE(compressed, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return BUFFER_E;
}
idx = 0;
XMEMCPY(output + idx, contentInfoSeq, contentInfoSeqSz);
idx += contentInfoSeqSz;
XMEMCPY(output + idx, contentInfoTypeOid, contentInfoTypeOidSz);
idx += contentInfoTypeOidSz;
XMEMCPY(output + idx, contentInfoContentSeq, contentInfoContentSeqSz);
idx += contentInfoContentSeqSz;
XMEMCPY(output + idx, compressedDataSeq, compressedDataSeqSz);
idx += compressedDataSeqSz;
XMEMCPY(output + idx, cmsVersion, cmsVersionSz);
idx += cmsVersionSz;
XMEMCPY(output + idx, compressAlgId, compressAlgIdSz);
idx += compressAlgIdSz;
XMEMCPY(output + idx, encapContentInfoSeq, encapContentInfoSeqSz);
idx += encapContentInfoSeqSz;
XMEMCPY(output + idx, contentTypeOid, contentTypeOidSz);
idx += contentTypeOidSz;
XMEMCPY(output + idx, contentSeq, contentSeqSz);
idx += contentSeqSz;
XMEMCPY(output + idx, contentOctetStr, contentOctetStrSz);
idx += contentOctetStrSz;
XMEMCPY(output + idx, compressed, compressedSz);
idx += compressedSz;
XFREE(compressed, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return idx;
}
/* unwrap and decompress PKCS#7/CMS compressedData object,
* returned decoded size */
int wc_PKCS7_DecodeCompressedData(PKCS7* pkcs7, byte* pkiMsg, word32 pkiMsgSz,
byte* output, word32 outputSz)
{
int length, version, ret;
word32 idx = 0, algOID, contentType;
byte* decompressed;
word32 decompressedSz;
if (pkcs7 == NULL || pkiMsg == NULL || pkiMsgSz == 0 ||
output == NULL || outputSz == 0) {
return BAD_FUNC_ARG;
}
/* get ContentInfo SEQUENCE */
if (GetSequence(pkiMsg, &idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* get ContentInfo contentType */
if (wc_GetContentType(pkiMsg, &idx, &contentType, pkiMsgSz) < 0)
return ASN_PARSE_E;
if (contentType != COMPRESSED_DATA)
return ASN_PARSE_E;
/* get ContentInfo content EXPLICIT SEQUENCE */
if (pkiMsg[idx++] != (ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC | 0))
return ASN_PARSE_E;
if (GetLength(pkiMsg, &idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* get CompressedData SEQUENCE */
if (GetSequence(pkiMsg, &idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* get version */
if (GetMyVersion(pkiMsg, &idx, &version, pkiMsgSz) < 0)
return ASN_PARSE_E;
if (version != 0) {
WOLFSSL_MSG("CMS CompressedData version MUST be 0, but is not");
return ASN_PARSE_E;
}
/* get CompressionAlgorithmIdentifier */
if (GetAlgoId(pkiMsg, &idx, &algOID, oidIgnoreType, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* Only supports zlib for compression currently:
* id-alg-zlibCompress (1.2.840.113549.1.9.16.3.8) */
if (algOID != ZLIBc) {
WOLFSSL_MSG("CMS CompressedData only supports zlib algorithm");
return ASN_PARSE_E;
}
/* get EncapsulatedContentInfo SEQUENCE */
if (GetSequence(pkiMsg, &idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* get ContentType OID */
if (wc_GetContentType(pkiMsg, &idx, &contentType, pkiMsgSz) < 0)
return ASN_PARSE_E;
pkcs7->contentOID = contentType;
/* get eContent EXPLICIT SEQUENCE */
if (pkiMsg[idx++] != (ASN_CONSTRUCTED | ASN_CONTEXT_SPECIFIC | 0))
return ASN_PARSE_E;
if (GetLength(pkiMsg, &idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* get content OCTET STRING */
if (pkiMsg[idx++] != ASN_OCTET_STRING)
return ASN_PARSE_E;
if (GetLength(pkiMsg, &idx, &length, pkiMsgSz) < 0)
return ASN_PARSE_E;
/* allocate space for decompressed data */
decompressed = (byte*)XMALLOC(length, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
if (decompressed == NULL) {
WOLFSSL_MSG("Error allocating memory for CMS decompression buffer");
return MEMORY_E;
}
/* decompress content */
ret = wc_DeCompress(decompressed, length, &pkiMsg[idx], length);
if (ret < 0) {
XFREE(decompressed, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return ret;
}
decompressedSz = (word32)ret;
/* get content */
if (outputSz < decompressedSz) {
WOLFSSL_MSG("CMS output buffer too small to hold decompressed data");
XFREE(decompressed, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return BUFFER_E;
}
XMEMCPY(output, decompressed, decompressedSz);
XFREE(decompressed, pkcs7->heap, DYNAMIC_TYPE_PKCS7);
return decompressedSz;
}
#endif /* HAVE_LIBZ && !NO_PKCS7_COMPRESSED_DATA */
#else /* HAVE_PKCS7 */
#ifdef _MSC_VER
/* 4206 warning for blank file */
#pragma warning(disable: 4206)
#endif
#endif /* HAVE_PKCS7 */
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