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psa_util: minor improvements to convert_der_to_raw_single_int()

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Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
This commit is contained in:
Valerio Setti 2024-01-30 15:08:40 +01:00
parent 7a795fd951
commit 78da7468ca
1 changed files with 5 additions and 5 deletions
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10
library/psa_util.c
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@ -459,7 +459,8 @@ int mbedtls_ecdsa_raw_to_der(const unsigned char *raw, size_t raw_len,
* \param der_len Length of the der buffer in bytes. * \param der_len Length of the der buffer in bytes.
* \param raw Output buffer that will be filled with the * \param raw Output buffer that will be filled with the
* converted data. This should be at least * converted data. This should be at least
* coordinate_size bytes. * coordinate_size bytes and it must be zeroed before
* calling this function.
* \param coordinate_size Size (in bytes) of a single coordinate in raw * \param coordinate_size Size (in bytes) of a single coordinate in raw
* format. * format.
* *
@ -500,11 +501,10 @@ 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. */ /* Parsed number is longer than the maximum expected value. */
return MBEDTLS_ERR_ASN1_INVALID_DATA; return MBEDTLS_ERR_ASN1_INVALID_DATA;
} else {
padding_len = coordinate_size - unpadded_len;
/* raw buffer was already zeroed in mbedtls_ecdsa_der_to_raw() so
* zero-padding operation is skipped here. */
} }
padding_len = coordinate_size - unpadded_len;
/* raw buffer was already zeroed by the calling function so zero-padding
* operation is skipped here. */
memcpy(raw + padding_len, p, unpadded_len); memcpy(raw + padding_len, p, unpadded_len);
p += unpadded_len; p += unpadded_len;