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add STM32F2 SHA1, MD5 support

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This commit is contained in:
Chris Conlon
2012-12-26 15:16:39 -07:00
parent acf1d07eea
commit a7e0f4e483
5 changed files with 241 additions and 0 deletions
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116
ctaocrypt/src/md5.c
View File

@@ -33,6 +33,120 @@
#endif #endif
#ifdef STM32F2_CRYPTO
/*
* STM32F2 hardware MD5 support through the STM32F2 standard peripheral
* library. Documentation located in STM32F2xx Standard Peripheral Library
* document (See note in README).
*/
#include "stm32f2xx.h"
void InitMd5(Md5* md5)
{
/* STM32F2 struct notes:
* md5->buffer = first 4 bytes used to hold partial block if needed
* md5->buffLen = num bytes currently stored in md5->buffer
* md5->loLen = num bytes that have been written to STM32 FIFO
*/
XMEMSET(md5->buffer, 0, MD5_REG_SIZE);
md5->buffLen = 0;
md5->loLen = 0;
/* initialize HASH peripheral */
HASH_DeInit();
/* configure algo used, algo mode, datatype */
HASH->CR &= ~ (HASH_CR_ALGO | HASH_CR_DATATYPE | HASH_CR_MODE);
HASH->CR |= (HASH_AlgoSelection_MD5 | HASH_AlgoMode_HASH
| HASH_DataType_8b);
/* reset HASH processor */
HASH->CR |= HASH_CR_INIT;
}
void Md5Update(Md5* md5, const byte* data, word32 len)
{
word32 i = 0;
word32 fill = 0;
word32 diff = 0;
/* if saved partial block is available */
if (md5->buffLen > 0) {
fill = 4 - md5->buffLen;
/* if enough data to fill, fill and push to FIFO */
if (fill <= len) {
XMEMCPY((byte*)md5->buffer + md5->buffLen, data, fill);
HASH_DataIn(*(uint32_t*)md5->buffer);
data += fill;
len -= fill;
md5->loLen += 4;
md5->buffLen = 0;
} else {
/* append partial to existing stored block */
XMEMCPY((byte*)md5->buffer + md5->buffLen, data, len);
md5->buffLen += len;
return;
}
}
/* write input block in the IN FIFO */
for (i = 0; i < len; i += 4)
{
diff = len - i;
if (diff < 4) {
/* store incomplete last block, not yet in FIFO */
XMEMSET(md5->buffer, 0, MD5_REG_SIZE);
XMEMCPY((byte*)md5->buffer, data, diff);
md5->buffLen = diff;
} else {
HASH_DataIn(*(uint32_t*)data);
data+=4;
}
}
/* keep track of total data length thus far */
md5->loLen += (len - md5->buffLen);
}
void Md5Final(Md5* md5, byte* hash)
{
__IO uint16_t nbvalidbitsdata = 0;
/* finish reading any trailing bytes into FIFO */
if (md5->buffLen > 0) {
HASH_DataIn(*(uint32_t*)md5->buffer);
md5->loLen += md5->buffLen;
}
/* calculate number of valid bits in last word of input data */
nbvalidbitsdata = 8 * (md5->loLen % MD5_REG_SIZE);
/* configure number of valid bits in last word of the data */
HASH_SetLastWordValidBitsNbr(nbvalidbitsdata);
/* start HASH processor */
HASH_StartDigest();
/* wait until Busy flag == RESET */
while (HASH_GetFlagStatus(HASH_FLAG_BUSY) != RESET) {}
/* read message digest */
md5->digest[0] = HASH->HR[0];
md5->digest[1] = HASH->HR[1];
md5->digest[2] = HASH->HR[2];
md5->digest[3] = HASH->HR[3];
ByteReverseWords(md5->digest, md5->digest, MD5_DIGEST_SIZE);
XMEMCPY(hash, md5->digest, MD5_DIGEST_SIZE);
InitMd5(md5); /* reset state */
}
#else /* CTaoCrypt software implementation */
#ifndef min #ifndef min
static INLINE word32 min(word32 a, word32 b) static INLINE word32 min(word32 a, word32 b)
@@ -224,3 +338,5 @@ void Md5Final(Md5* md5, byte* hash)
InitMd5(md5); /* reset state */ InitMd5(md5); /* reset state */
} }
#endif /* STM32F2_CRYPTO */

2
ctaocrypt/src/misc.c
View File

@@ -76,6 +76,8 @@ STATIC INLINE word32 ByteReverseWord32(word32 value)
#ifdef PPC_INTRINSICS #ifdef PPC_INTRINSICS
/* PPC: load reverse indexed instruction */ /* PPC: load reverse indexed instruction */
return (word32)__lwbrx(&value,0); return (word32)__lwbrx(&value,0);
#elif defined(KEIL_INTRINSICS)
return (word32)__rev(value);
#elif defined(FAST_ROTATE) #elif defined(FAST_ROTATE)
/* 5 instructions with rotate instruction, 9 without */ /* 5 instructions with rotate instruction, 9 without */
return (rotrFixed(value, 8U) & 0xff00ff00) | return (rotrFixed(value, 8U) & 0xff00ff00) |

117
ctaocrypt/src/sha.c
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@@ -31,6 +31,121 @@
#endif #endif
#ifdef STM32F2_CRYPTO
/*
* STM32F2 hardware SHA1 support through the STM32F2 standard peripheral
* library. Documentation located in STM32F2xx Standard Peripheral Library
* document (See note in README).
*/
#include "stm32f2xx.h"
void InitSha(Sha* sha)
{
/* STM32F2 struct notes:
* sha->buffer = first 4 bytes used to hold partial block if needed
* sha->buffLen = num bytes currently stored in sha->buffer
* sha->loLen = num bytes that have been written to STM32 FIFO
*/
XMEMSET(sha->buffer, 0, SHA_REG_SIZE);
sha->buffLen = 0;
sha->loLen = 0;
/* initialize HASH peripheral */
HASH_DeInit();
/* configure algo used, algo mode, datatype */
HASH->CR &= ~ (HASH_CR_ALGO | HASH_CR_DATATYPE | HASH_CR_MODE);
HASH->CR |= (HASH_AlgoSelection_SHA1 | HASH_AlgoMode_HASH
| HASH_DataType_8b);
/* reset HASH processor */
HASH->CR |= HASH_CR_INIT;
}
void ShaUpdate(Sha* sha, const byte* data, word32 len)
{
word32 i = 0;
word32 fill = 0;
word32 diff = 0;
/* if saved partial block is available */
if (sha->buffLen) {
fill = 4 - sha->buffLen;
/* if enough data to fill, fill and push to FIFO */
if (fill <= len) {
XMEMCPY((byte*)sha->buffer + sha->buffLen, data, fill);
HASH_DataIn(*(uint32_t*)sha->buffer);
data += fill;
len -= fill;
sha->loLen += 4;
sha->buffLen = 0;
} else {
/* append partial to existing stored block */
XMEMCPY((byte*)sha->buffer + sha->buffLen, data, len);
sha->buffLen += len;
return;
}
}
/* write input block in the IN FIFO */
for(i = 0; i < len; i += 4)
{
diff = len - i;
if ( diff < 4) {
/* store incomplete last block, not yet in FIFO */
XMEMSET(sha->buffer, 0, SHA_REG_SIZE);
XMEMCPY((byte*)sha->buffer, data, diff);
sha->buffLen = diff;
} else {
HASH_DataIn(*(uint32_t*)data);
data+=4;
}
}
/* keep track of total data length thus far */
sha->loLen += (len - sha->buffLen);
}
void ShaFinal(Sha* sha, byte* hash)
{
__IO uint16_t nbvalidbitsdata = 0;
/* finish reading any trailing bytes into FIFO */
if (sha->buffLen) {
HASH_DataIn(*(uint32_t*)sha->buffer);
sha->loLen += sha->buffLen;
}
/* calculate number of valid bits in last word of input data */
nbvalidbitsdata = 8 * (sha->loLen % SHA_REG_SIZE);
/* configure number of valid bits in last word of the data */
HASH_SetLastWordValidBitsNbr(nbvalidbitsdata);
/* start HASH processor */
HASH_StartDigest();
/* wait until Busy flag == RESET */
while (HASH_GetFlagStatus(HASH_FLAG_BUSY) != RESET) {}
/* read message digest */
sha->digest[0] = HASH->HR[0];
sha->digest[1] = HASH->HR[1];
sha->digest[2] = HASH->HR[2];
sha->digest[3] = HASH->HR[3];
sha->digest[4] = HASH->HR[4];
ByteReverseWords(sha->digest, sha->digest, SHA_DIGEST_SIZE);
XMEMCPY(hash, sha->digest, SHA_DIGEST_SIZE);
InitSha(sha); /* reset state */
}
#else /* CTaoCrypt software implementation */
#ifndef min #ifndef min
static INLINE word32 min(word32 a, word32 b) static INLINE word32 min(word32 a, word32 b)
@@ -228,3 +343,5 @@ void ShaFinal(Sha* sha, byte* hash)
InitSha(sha); /* reset state */ InitSha(sha); /* reset state */
} }
#endif /* STM32F2_CRYPTO */

3
cyassl/ctaocrypt/md5.h
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@@ -33,6 +33,9 @@
/* in bytes */ /* in bytes */
enum { enum {
#ifdef STM32F2_CRYPTO
MD5_REG_SIZE = 4, /* STM32 register size, bytes */
#endif
MD5 = 0, /* hash type unique */ MD5 = 0, /* hash type unique */
MD5_BLOCK_SIZE = 64, MD5_BLOCK_SIZE = 64,
MD5_DIGEST_SIZE = 16, MD5_DIGEST_SIZE = 16,

3
cyassl/ctaocrypt/sha.h
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@@ -32,6 +32,9 @@
/* in bytes */ /* in bytes */
enum { enum {
#ifdef STM32F2_CRYPTO
SHA_REG_SIZE = 4, /* STM32 register size, bytes */
#endif
SHA = 1, /* hash type unique */ SHA = 1, /* hash type unique */
SHA_BLOCK_SIZE = 64, SHA_BLOCK_SIZE = 64,
SHA_DIGEST_SIZE = 20, SHA_DIGEST_SIZE = 20,