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add sanity check of hash to atmel port

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JacobBarthelmeh
2026-05-06 08:34:50 -06:00
parent 976e4b2d15
commit f140546ba1
1 changed files with 10 additions and 0 deletions
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wolfcrypt/src/port/atmel/atmel.c
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@@ -467,6 +467,16 @@ int atmel_ecc_create_key(int slotId, byte* peerKey)
int atmel_ecc_sign(int slotId, const byte* message, byte* signature)
{
int ret;
#ifndef WC_ALLOW_ECC_ZERO_HASH
byte hashIsZero = 0;
word32 zIdx;
/* defensive sanity check on all 0's hash */
for (zIdx = 0; zIdx < ATECC_KEY_SIZE; zIdx++)
hashIsZero |= message[zIdx];
if (hashIsZero == 0)
return ECC_BAD_ARG_E;
#endif
ret = atcab_sign(slotId, message, signature);
ret = atmel_ecc_translate_err(ret);