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psa_util: some code improvement to convert_der_to_raw_single_int()

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This commit also fixes test_suite_psa_crypto_util.data due to the
change in one of the return values.

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
This commit is contained in:
Valerio Setti
2024-01-29 16:53:03 +01:00
parent f8ce457fb6
commit 9b9b5a52d9
2 changed files with 8 additions and 4 deletions
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10
library/psa_util.c
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@ -494,7 +494,7 @@ static int convert_der_to_raw_single_int(unsigned char *der, size_t der_len,
}
/* Skip possible leading zero */
if (*p == 0x00) {
if ((*p == 0x00) && (unpadded_len > 0)) {
p++;
unpadded_len--;
/* It should never happen that the input number is all zeros. */
@ -503,9 +503,13 @@ static int convert_der_to_raw_single_int(unsigned char *der, size_t der_len,
}
}
if (unpadded_len < coordinate_size) {
if (unpadded_len > coordinate_size) {
/* Parsed number is longer than the maximum expected value. */
return MBEDTLS_ERR_ASN1_INVALID_DATA;
} else {
padding_len = coordinate_size - unpadded_len;
memset(raw, 0x00, padding_len);
/* raw buffer was already zeroed in mbedtls_ecdsa_der_to_raw() so
* zero-padding operation is skipped here. */
}
memcpy(raw + padding_len, p, unpadded_len);
p += unpadded_len;