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pkwrite: some reshaping for Montgomery keys in mbedtls_pk_write_pubkey_der()

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Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
This commit is contained in:
Valerio Setti 2023-11-29 17:16:55 +01:00
parent a4f70fe3fe
commit bcc004b549
1 changed files with 10 additions and 13 deletions
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23
library/pkwrite.c
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@ -598,27 +598,24 @@ int mbedtls_pk_write_pubkey_der(const mbedtls_pk_context *key, unsigned char *bu
pk_type = pk_get_type_ext(key);
#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
if (pk_type == MBEDTLS_PK_ECKEY) {
if (pk_get_type_ext(key) == MBEDTLS_PK_ECKEY) {
mbedtls_ecp_group_id ec_grp_id = mbedtls_pk_get_ec_group_id(key);
/* 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 */
if (MBEDTLS_PK_IS_RFC8410_GROUP_ID(ec_grp_id)) {
ret = mbedtls_oid_get_oid_by_ec_grp_algid(ec_grp_id, &oid, &oid_len);
if (ret != 0) {
return ret;
}
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));
} else {
return ret;
MBEDTLS_ASN1_CHK_ADD(par_len, pk_write_ec_param(&c, buf, ec_grp_id));
}
}
#endif /* MBEDTLS_PK_HAVE_ECC_KEYS */
/* At this point oid_len is not null only for EC Montgomery keys. */
if (oid_len == 0) {
if ((ret = mbedtls_oid_get_oid_by_pk_alg(pk_type, &oid,
&oid_len)) != 0) {
ret = mbedtls_oid_get_oid_by_pk_alg(pk_type, &oid, &oid_len);
if (ret != 0) {
return ret;
}
}