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internal.c: refactoring BuildMessage to reduce stack usage:

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--- variable hmac moved to the heap (up to 64 bytes saved)
This commit is contained in:
Moisés Guimarães 2014-10-17 16:31:09 -03:00
parent 5ef9a21eaa
commit a7e585b63d
1 changed files with 17 additions and 2 deletions
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19
src/internal.c
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@ -6928,11 +6928,26 @@ static int BuildMessage(CYASSL* ssl, byte* output, int outSz,
if (ssl->specs.cipher_type != aead) { if (ssl->specs.cipher_type != aead) {
#ifdef HAVE_TRUNCATED_HMAC #ifdef HAVE_TRUNCATED_HMAC
if (ssl->truncated_hmac && ssl->specs.hash_size > digestSz) { if (ssl->truncated_hmac && ssl->specs.hash_size > digestSz) {
byte hmac[MAX_DIGEST_SIZE]; #ifdef CYASSL_SMALL_STACK
byte* hmac = NULL;
#else
byte hmac[MAX_DIGEST_SIZE];
#endif
#ifdef CYASSL_SMALL_STACK
hmac = (byte*)XMALLOC(MAX_DIGEST_SIZE, NULL,
DYNAMIC_TYPE_TMP_BUFFER);
if (hmac == NULL)
return MEMORY_E;
#endif
ret = ssl->hmac(ssl, hmac, output + headerSz + ivSz, inSz, ret = ssl->hmac(ssl, hmac, output + headerSz + ivSz, inSz,
type, 0); type, 0);
XMEMCPY(output + idx, hmac, digestSz); XMEMCPY(output + idx, hmac, digestSz);
#ifdef CYASSL_SMALL_STACK
XFREE(hmac, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif
} else } else
#endif #endif
ret = ssl->hmac(ssl, output+idx, output + headerSz + ivSz, inSz, ret = ssl->hmac(ssl, output+idx, output + headerSz + ivSz, inSz,