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Move loading of public part of ECP into function

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Signed-off-by: Paul Elliott <paul.elliott@arm.com>
This commit is contained in:
Paul Elliott
2023-02-06 15:59:09 +00:00
parent c9774411d4
commit eefe47292c
3 changed files with 29 additions and 19 deletions
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23
library/psa_crypto_ecp.c
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@@ -404,6 +404,21 @@ cleanup:
return mbedtls_to_psa_error(ret);
}
int mbedtls_psa_ecp_load_public_part(mbedtls_ecp_keypair *ecp)
{
int ret = 0;
/* Check whether the public part is loaded. If not, load it. */
if (mbedtls_ecp_is_zero(&ecp->Q)) {
ret = mbedtls_ecp_mul(&ecp->grp, &ecp->Q,
&ecp->d, &ecp->grp.G,
mbedtls_psa_get_random,
MBEDTLS_PSA_RANDOM_STATE);
}
return ret;
}
psa_status_t mbedtls_psa_ecdsa_verify_hash(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
@@ -443,12 +458,8 @@ psa_status_t mbedtls_psa_ecdsa_verify_hash(
signature + curve_bytes,
curve_bytes));
/* Check whether the public part is loaded. If not, load it. */
if (mbedtls_ecp_is_zero(&ecp->Q)) {
MBEDTLS_MPI_CHK(
mbedtls_ecp_mul(&ecp->grp, &ecp->Q, &ecp->d, &ecp->grp.G,
mbedtls_psa_get_random, MBEDTLS_PSA_RANDOM_STATE));
}
MBEDTLS_MPI_CHK(mbedtls_psa_ecp_load_public_part(ecp));
ret = mbedtls_ecdsa_verify(&ecp->grp, hash, hash_length,
&ecp->Q, &r, &s);