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Fixed alignment assumptions in SHA2 update. (#2034) 

Unaligned loads are a no-no on many architectures, the ESP8266 included.
This commit is contained in:
Johny Mattsson 2017-07-31 22:12:34 +10:00 committed by Marcel Stör
parent d93465cd86
commit e09e830d4b
1 changed files with 18 additions and 2 deletions
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20
app/crypto/sha2.c
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@ -32,6 +32,8 @@
*
*/
/* ESP8266-specific tweaks by Johny Mattsson <jmattsson@dius.com.au> */
#include "user_config.h"
#ifdef SHA2_ENABLE
@ -491,7 +493,14 @@ void ICACHE_FLASH_ATTR SHA256_Update(SHA256_CTX* context, const sha2_byte *data,
}
while (len >= SHA256_BLOCK_LENGTH) {
/* Process as many complete blocks as we can */
SHA256_Transform(context, (sha2_word32*)data);
if ((int)data & (sizeof(sha2_word32)-1))
{
// have to bounce via buffer, otherwise we'll hit unaligned load exception
MEMCPY_BCOPY(context->buffer, data, SHA256_BLOCK_LENGTH);
SHA256_Transform(context, (sha2_word32*)context->buffer);
}
else
SHA256_Transform(context, (sha2_word32*)data);
context->bitcount += SHA256_BLOCK_LENGTH << 3;
len -= SHA256_BLOCK_LENGTH;
data += SHA256_BLOCK_LENGTH;
@ -782,7 +791,14 @@ void ICACHE_FLASH_ATTR SHA512_Update(SHA512_CTX* context, const sha2_byte *data,
}
while (len >= SHA512_BLOCK_LENGTH) {
/* Process as many complete blocks as we can */
SHA512_Transform(context, (sha2_word64*)data);
if ((int)data & (sizeof(sha2_word64)-1))
{
// have to bounce via buffer, otherwise we'll hit unaligned load exception
MEMCPY_BCOPY(context->buffer, data, SHA512_BLOCK_LENGTH);
SHA512_Transform(context, (sha2_word64*)context->buffer);
}
else
SHA512_Transform(context, (sha2_word64*)data);
ADDINC128(context->bitcount, SHA512_BLOCK_LENGTH << 3);
len -= SHA512_BLOCK_LENGTH;
data += SHA512_BLOCK_LENGTH;