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Improve the hash wait logic by separating the data input ready from the digest calculation complete.

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This commit is contained in:
David Garske
2025-05-05 13:22:06 -07:00
parent 0f4ce03c28
commit 751dcdf3df
1 changed files with 28 additions and 7 deletions
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35
wolfcrypt/src/port/st/stm32.c
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@ -252,16 +252,37 @@ static void wc_Stm32_Hash_GetDigest(byte* hash, int digestSize)
#endif
}
static int wc_Stm32_Hash_WaitDone(STM32_HASH_Context* stmCtx)
static int wc_Stm32_Hash_WaitDataReady(STM32_HASH_Context* stmCtx)
{
int timeout = 0;
(void)stmCtx;
/* wait until not busy and hash digest / input block are complete */
while (((HASH->SR & HASH_SR_BUSY)
/* wait until not busy and data input buffer ready */
while ((HASH->SR & HASH_SR_BUSY)
#ifdef HASH_IMR_DCIE
|| (HASH->SR & HASH_SR_DCIS) == 0
&& (HASH->SR & HASH_SR_DCIS) == 0
#endif
&& ++timeout < STM32_HASH_TIMEOUT) {
};
#ifdef DEBUG_STM32_HASH
printf("STM Wait Data %d, HASH->SR %lx\n", timeout, HASH->SR);
#endif
/* verify timeout did not occur */
if (timeout >= STM32_HASH_TIMEOUT) {
return WC_TIMEOUT_E;
}
return 0;
}
static int wc_Stm32_Hash_WaitCalcComp(STM32_HASH_Context* stmCtx)
{
int timeout = 0;
(void)stmCtx;
/* wait until not busy and hash digest calculation complete */
while (((HASH->SR & HASH_SR_BUSY)
#ifdef HASH_IMR_DINIE
|| (HASH->SR & HASH_SR_DINIS) == 0
#endif
@ -269,7 +290,7 @@ static int wc_Stm32_Hash_WaitDone(STM32_HASH_Context* stmCtx)
};
#ifdef DEBUG_STM32_HASH
printf("STM Wait done %d, HASH->SR %lx\n", timeout, HASH->SR);
printf("STM Wait Calc %d, HASH->SR %lx\n", timeout, HASH->SR);
#endif
/* verify timeout did not occur */
@ -364,7 +385,7 @@ int wc_Stm32_Hash_Update(STM32_HASH_Context* stmCtx, word32 algo,
if (wroteToFifo) {
/* make sure hash operation is done */
ret = wc_Stm32_Hash_WaitDone(stmCtx);
ret = wc_Stm32_Hash_WaitDataReady(stmCtx);
/* save hash state for next operation */
wc_Stm32_Hash_SaveContext(stmCtx);
@ -405,7 +426,7 @@ int wc_Stm32_Hash_Final(STM32_HASH_Context* stmCtx, word32 algo,
HASH->STR |= HASH_STR_DCAL;
/* wait for hash done */
ret = wc_Stm32_Hash_WaitDone(stmCtx);
ret = wc_Stm32_Hash_WaitCalcComp(stmCtx);
if (ret == 0) {
/* read message digest */
wc_Stm32_Hash_GetDigest(hash, digestSize);