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wolfcrypt/src/random.c: small stack refactor of noise[] in wc_Entropy_Get().

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Daniel Pouzzner
2025-07-03 18:30:46 -05:00
parent 478bfafea3
commit 688bc168de
1 changed files with 15 additions and 1 deletions
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16
wolfcrypt/src/random.c
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@@ -1494,13 +1494,23 @@ static wolfSSL_Mutex entropy_mutex WOLFSSL_MUTEX_INITIALIZER_CLAUSE(entropy_mute
int wc_Entropy_Get(int bits, unsigned char* entropy, word32 len) int wc_Entropy_Get(int bits, unsigned char* entropy, word32 len)
{ {
int ret = 0; int ret = 0;
#ifdef WOLFSSL_SMALL_STACK
byte *noise = NULL;
#else
byte noise[MAX_NOISE_CNT]; byte noise[MAX_NOISE_CNT];
#endif
/* Noise length is the number of 8 byte samples required to get the bits of /* Noise length is the number of 8 byte samples required to get the bits of
* entropy requested. */ * entropy requested. */
int noise_len = (bits + ENTROPY_EXTRA) / ENTROPY_MIN; int noise_len = (bits + ENTROPY_EXTRA) / ENTROPY_MIN;
#ifdef WOLFSSL_SMALL_STACK
noise = (byte *)XMALLOC(MAX_NOISE_CNT, NULL, DYNAMIC_TYPE_TMP_BUFFER);
if (noise == NULL)
return MEMORY_E;
#endif
/* Lock the mutex as collection uses globals. */ /* Lock the mutex as collection uses globals. */
if (wc_LockMutex(&entropy_mutex) != 0) { if ((ret == 0) && (wc_LockMutex(&entropy_mutex) != 0)) {
ret = BAD_MUTEX_E; ret = BAD_MUTEX_E;
} }
@@ -1558,6 +1568,10 @@ int wc_Entropy_Get(int bits, unsigned char* entropy, word32 len)
wc_UnLockMutex(&entropy_mutex); wc_UnLockMutex(&entropy_mutex);
} }
#ifdef WOLFSSL_SMALL_STACK
XFREE(noise, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#endif
return ret; return ret;
} }