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Fix challenge length calculation for LT64.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
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Pol Henarejos
2025-03-23 23:27:52 +01:00
parent 751fcf0538
commit b152ff15a8
1 changed files with 7 additions and 1 deletions
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8
src/fido/otp.c
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@@ -505,7 +505,13 @@ int cmd_otp() {
uint8_t aes_key[KEY_SIZE + UID_SIZE];
memcpy(aes_key, otp_config->aes_key, KEY_SIZE);
memcpy(aes_key + KEY_SIZE, otp_config->uid, UID_SIZE);
mbedtls_md_hmac(mbedtls_md_info_from_type(MBEDTLS_MD_SHA1), aes_key, sizeof(aes_key), apdu.data, (otp_config->cfg_flags & HMAC_LT64) ? 8 : 64, res_APDU);
uint8_t chal_len = 64;
if (otp_config->cfg_flags & HMAC_LT64) {
while (chal_len > 0 && apdu.data[63] == apdu.data[chal_len - 1]) {
chal_len--;
}
}
mbedtls_md_hmac(mbedtls_md_info_from_type(MBEDTLS_MD_SHA1), aes_key, sizeof(aes_key), apdu.data, chal_len, res_APDU);
if (ret == 0) {
res_APDU_size = 20;
}