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add sanity check on hash size with STM32 port

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This commit is contained in:
Jacob Barthelmeh
2023-06-05 14:45:34 -06:00
committed by JacobBarthelmeh
parent c040b4a339
commit 2a0b244393
1 changed files with 14 additions and 1 deletions
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15
wolfcrypt/src/port/st/stm32.c
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@ -984,8 +984,21 @@ int stm32_ecc_verify_hash_ex(mp_int *r, mp_int *s, const byte* hash,
pka_ecc.pPubKeyCurvePtY = Qybin;
pka_ecc.RSign = Rbin;
pka_ecc.SSign = Sbin;
XMEMSET(Hashbin, 0, STM32_MAX_ECC_SIZE);
XMEMCPY(Hashbin + (size - hashlen), hash, hashlen);
if (hashlen > STM32_MAX_ECC_SIZE) {
return ECC_BAD_ARG_E;
}
else if (hashlen > size) {
/* in the case that hashlen is larger than key size place hash at
* beginning of buffer */
XMEMCPY(Hashbin, hash, hashlen);
}
else {
/* in all other cases where hashlen is equal to or less than the key
* size pad the Hashbin buffer with leading zero's */
XMEMCPY(Hashbin + (size - hashlen), hash, hashlen);
}
pka_ecc.hash = Hashbin;
status = HAL_PKA_ECDSAVerif(&hpka, &pka_ecc, HAL_MAX_DELAY);