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pk: optimize/reshape public key writing

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Signed-off-by: valerio <valerio.setti@nordicsemi.no>
This commit is contained in:
valerio 2023-05-31 12:13:17 +02:00
parent 9ea26173d6
commit ba1fd32eda
1 changed files with 10 additions and 30 deletions
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40
library/pkwrite.c
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@ -377,44 +377,22 @@ int mbedtls_pk_write_pubkey_der(const mbedtls_pk_context *key, unsigned char *bu
pk_type = mbedtls_pk_get_type(key);
#if defined(MBEDTLS_ECP_LIGHT)
if (pk_type == MBEDTLS_PK_ECKEY) {
#if defined(MBEDTLS_ECP_C)
ec_grp_id = mbedtls_pk_ec_ro(*key)->grp.id;
#else /* MBEDTLS_ECP_C */
ec_grp_id = mbedtls_ecc_group_of_psa(key->ec_family, key->ec_bits, 0);
#endif /* MBEDTLS_ECP_C */
ec_grp_id = mbedtls_pk_get_group_id(key);
}
#endif /* MBEDTLS_ECP_LIGHT */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if (pk_type == MBEDTLS_PK_OPAQUE) {
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_key_type_t key_type;
if (PSA_SUCCESS != psa_get_key_attributes(key->priv_id,
&attributes)) {
return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED;
}
key_type = psa_get_key_type(&attributes);
psa_key_type_t opaque_key_type = pk_get_opaque_key_type(key);
#if defined(MBEDTLS_ECP_LIGHT)
if (PSA_KEY_TYPE_IS_ECC_KEY_PAIR(key_type)) {
psa_ecc_family_t curve;
curve = PSA_KEY_TYPE_ECC_GET_FAMILY(key_type);
if (curve != 0) {
ec_grp_id = mbedtls_ecc_group_of_psa(curve, psa_get_key_bits(&attributes), 0);
if (ec_grp_id != MBEDTLS_ECP_DP_NONE) {
/* The rest of the function works as for legacy EC contexts. */
if (PSA_KEY_TYPE_IS_ECC(opaque_key_type)) {
pk_type = MBEDTLS_PK_ECKEY;
}
}
}
ec_grp_id = mbedtls_pk_get_group_id(key);
} else
#endif /* MBEDTLS_ECP_LIGHT */
if (PSA_KEY_TYPE_IS_RSA(key_type)) {
if (PSA_KEY_TYPE_IS_RSA(opaque_key_type)) {
/* The rest of the function works as for legacy RSA contexts. */
pk_type = MBEDTLS_PK_RSA;
}
psa_reset_key_attributes(&attributes);
}
/* `pk_type` will have been changed to non-opaque by here if this function can handle it */
if (pk_type == MBEDTLS_PK_OPAQUE) {
@ -424,11 +402,13 @@ int mbedtls_pk_write_pubkey_der(const mbedtls_pk_context *key, unsigned char *bu
#if defined(MBEDTLS_ECP_LIGHT)
if (pk_type == MBEDTLS_PK_ECKEY) {
/* Some groups have their own AlgorithmIdentifier OID, others are handled by mbedtls_oid_get_oid_by_pk_alg() below */
/* Some groups have their own AlgorithmIdentifier OID, others are handled
* by mbedtls_oid_get_oid_by_pk_alg() below */
ret = mbedtls_oid_get_oid_by_ec_grp_algid(ec_grp_id, &oid, &oid_len);
if (ret == 0) {
/* Currently, none of the supported algorithms that have their own AlgorithmIdentifier OID have any parameters */
/* Currently, none of the supported algorithms that have their own
* AlgorithmIdentifier OID have any parameters */
has_par = 0;
} else if (ret == MBEDTLS_ERR_OID_NOT_FOUND) {
MBEDTLS_ASN1_CHK_ADD(par_len, pk_write_ec_param(&c, buf, ec_grp_id));