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add DES cksum and DES set odd parity

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This commit is contained in:
Jacob Barthelmeh
2017-02-08 15:54:11 -07:00
parent bb52b0a7b9
commit 4a9f5f3a7e
3 changed files with 99 additions and 5 deletions
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86
src/ssl.c
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@@ -14089,19 +14089,80 @@ int wolfSSL_EVP_MD_type(const WOLFSSL_EVP_MD *md)
int wolfSSL_DES_key_sched(WOLFSSL_const_DES_cblock* key,
WOLFSSL_DES_key_schedule* schedule)
{
WOLFSSL_ENTER("DES_key_sched");
WOLFSSL_ENTER("wolfSSL_DES_key_sched");
if (key == NULL || schedule == NULL) {
WOLFSSL_MSG("Null argument passed in");
}
else {
XMEMCPY(schedule, key, sizeof(const_DES_cblock));
XMEMCPY(schedule, key, sizeof(WOLFSSL_const_DES_cblock));
}
return 0;
}
/* intended to behave similar to Kerberos mit_des_cbc_cksum
* return the last 4 bytes of cipher text */
WOLFSSL_DES_LONG wolfSSL_DES_cbc_cksum(const unsigned char* in,
WOLFSSL_DES_cblock* out, long length, WOLFSSL_DES_key_schedule* sc,
WOLFSSL_const_DES_cblock* iv)
{
WOLFSSL_DES_LONG ret;
unsigned char* tmp;
unsigned char* data = (unsigned char*)in;
long dataSz = length;
byte dynamicFlag = 0; /* when padding the buffer created needs free'd */
WOLFSSL_ENTER("wolfSSL_DES_cbc_cksum");
if (in == NULL || out == NULL || sc == NULL || iv == NULL) {
WOLFSSL_MSG("Bad argument passed in");
return 0;
}
/* if input length is not a multiple of DES_BLOCK_SIZE pad with 0s */
if (dataSz % DES_BLOCK_SIZE) {
dataSz += DES_BLOCK_SIZE - (dataSz % DES_BLOCK_SIZE);
data = (unsigned char*)XMALLOC(dataSz, NULL,
DYNAMIC_TYPE_TMP_BUFFER);
if (data == NULL) {
WOLFSSL_MSG("Issue creating temporary buffer");
return 0;
}
dynamicFlag = 1; /* set to free buffer at end */
XMEMCPY(data, in, length);
XMEMSET(data + length, 0, dataSz - length); /* padding */
}
tmp = (unsigned char*)XMALLOC(dataSz, NULL, DYNAMIC_TYPE_TMP_BUFFER);
if (tmp == NULL) {
WOLFSSL_MSG("Issue creating temporary buffer");
if (dynamicFlag == 1) {
XFREE(data, NULL, DYNAMIC_TYPE_TMP_BUFFER);
}
return 0;
}
wolfSSL_DES_cbc_encrypt(data, tmp, dataSz, sc,
(WOLFSSL_DES_cblock*)iv, 1);
XMEMCPY((unsigned char*)out, tmp + (dataSz - DES_BLOCK_SIZE),
DES_BLOCK_SIZE);
ret = (((*((unsigned char*)out + 4) & 0xFF) << 24)|
((*((unsigned char*)out + 5) & 0xFF) << 16)|
((*((unsigned char*)out + 6) & 0xFF) << 8) |
(*((unsigned char*)out + 7) & 0xFF));
XFREE(tmp, NULL, DYNAMIC_TYPE_TMP_BUFFER);
if (dynamicFlag == 1) {
XFREE(data, NULL, DYNAMIC_TYPE_TMP_BUFFER);
}
return ret;
}
void wolfSSL_DES_cbc_encrypt(const unsigned char* input,
unsigned char* output, long length,
WOLFSSL_DES_key_schedule* schedule,
@@ -18555,8 +18616,25 @@ void wolfSSL_DES_set_key_unchecked(WOLFSSL_const_DES_cblock* myDes,
void wolfSSL_DES_set_odd_parity(WOLFSSL_DES_cblock* myDes)
{
(void)myDes;
WOLFSSL_STUB("wolfSSL_DES_set_odd_parity");
word32 i;
word32 sz = sizeof(WOLFSSL_DES_cblock);
WOLFSSL_ENTER("wolfSSL_DES_set_odd_parity");
for (i = 0; i < sz; i++) {
unsigned char c = *((unsigned char*)myDes + i);
if (((c & 0x01) ^
((c >> 1) & 0x01) ^
((c >> 2) & 0x01) ^
((c >> 3) & 0x01) ^
((c >> 4) & 0x01) ^
((c >> 5) & 0x01) ^
((c >> 6) & 0x01) ^
((c >> 7) & 0x01)) != 1) {
WOLFSSL_MSG("Setting odd parity bit");
*((unsigned char*)myDes + i) = *((unsigned char*)myDes + i) | 0x80;
}
}
}