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Tune body of pk_ecc_set_pubkey_from_prv()

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- avoid useless use of ret in PSA code, keep only status
- improve variable names
- keep declarations closer to use
- a few internal comments

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
This commit is contained in:
Manuel Pégourié-Gonnard 2023-07-26 22:43:25 +02:00
parent de25194a20
commit 0b8e45650f
1 changed files with 24 additions and 19 deletions
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43
library/pkparse.c
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@ -168,54 +168,59 @@ static int pk_ecc_set_pubkey_from_prv(mbedtls_pk_context *pk,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
psa_status_t status;
(void) f_rng;
(void) p_rng;
(void) prv;
(void) prv_len;
psa_status_t status;
status = psa_export_public_key(pk->priv_id, pk->pub_raw, sizeof(pk->pub_raw),
&pk->pub_raw_len);
return psa_pk_status_to_mbedtls(status);
#elif defined(MBEDTLS_USE_PSA_CRYPTO) /* && !MBEDTLS_PK_USE_PSA_EC_DATA */
int ret;
psa_status_t status;
(void) f_rng;
(void) p_rng;
psa_status_t status;
mbedtls_ecp_keypair *eck = (mbedtls_ecp_keypair *) pk->pk_ctx;
unsigned char key_buf[MBEDTLS_PSA_MAX_EC_PUBKEY_LENGTH];
size_t key_len;
mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
psa_key_attributes_t key_attr = PSA_KEY_ATTRIBUTES_INIT;
size_t curve_bits;
psa_ecc_family_t curve = mbedtls_ecc_group_to_psa(eck->grp.id, &curve_bits);
psa_status_t destruction_status;
/* Import private key into PSA, from serialized input */
mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
psa_key_attributes_t key_attr = PSA_KEY_ATTRIBUTES_INIT;
psa_set_key_type(&key_attr, PSA_KEY_TYPE_ECC_KEY_PAIR(curve));
psa_set_key_usage_flags(&key_attr, PSA_KEY_USAGE_EXPORT);
status = psa_import_key(&key_attr, prv, prv_len, &key_id);
ret = psa_pk_status_to_mbedtls(status);
if (ret != 0) {
return ret;
if (status != PSA_SUCCESS) {
return psa_pk_status_to_mbedtls(status);
}
status = psa_export_public_key(key_id, key_buf, sizeof(key_buf), &key_len);
ret = psa_pk_status_to_mbedtls(status);
destruction_status = psa_destroy_key(key_id);
if (ret != 0) {
return ret;
/* Export public key from PSA */
unsigned char pub[MBEDTLS_PSA_MAX_EC_PUBKEY_LENGTH];
size_t pub_len;
status = psa_export_public_key(key_id, pub, sizeof(pub), &pub_len);
psa_status_t destruction_status = psa_destroy_key(key_id);
if (status != PSA_SUCCESS) {
return psa_pk_status_to_mbedtls(status);
} else if (destruction_status != PSA_SUCCESS) {
return psa_pk_status_to_mbedtls(destruction_status);
}
return mbedtls_ecp_point_read_binary(&eck->grp, &eck->Q, key_buf, key_len);
/* Load serialized public key into ecp_keypair structure */
return mbedtls_ecp_point_read_binary(&eck->grp, &eck->Q, pub, pub_len);
#else /* MBEDTLS_USE_PSA_CRYPTO */
mbedtls_ecp_keypair *eck = (mbedtls_ecp_keypair *) pk->pk_ctx;
(void) prv;
(void) prv_len;
mbedtls_ecp_keypair *eck = (mbedtls_ecp_keypair *) pk->pk_ctx;
return mbedtls_ecp_mul(&eck->grp, &eck->Q, &eck->d, &eck->grp.G, f_rng, p_rng);
#endif /* MBEDTLS_USE_PSA_CRYPTO */
}