121 lines
4.3 KiB
C
121 lines
4.3 KiB
C
/**
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* \file pk_internal.h
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*
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* \brief Public Key abstraction layer: internal (i.e. library only) functions
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* and definitions.
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*/
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/*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MBEDTLS_PK_INTERNAL_H
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#define MBEDTLS_PK_INTERNAL_H
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#include "mbedtls/pk.h"
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#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
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#include "mbedtls/ecp.h"
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#endif
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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#include "psa/crypto.h"
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#endif
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#if defined(MBEDTLS_PSA_CRYPTO_C)
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#include "mbedtls/psa_util.h"
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#define PSA_PK_TO_MBEDTLS_ERR(status) psa_pk_status_to_mbedtls(status)
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#define PSA_PK_RSA_TO_MBEDTLS_ERR(status) PSA_TO_MBEDTLS_ERR_LIST(status, \
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psa_to_pk_rsa_errors, \
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psa_pk_status_to_mbedtls)
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#define PSA_PK_ECDSA_TO_MBEDTLS_ERR(status) PSA_TO_MBEDTLS_ERR_LIST(status, \
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psa_to_pk_ecdsa_errors, \
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psa_pk_status_to_mbedtls)
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#endif
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#if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
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/**
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* Public function mbedtls_pk_ec() can be used to get direct access to the
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* wrapped ecp_keypair structure pointed to the pk_ctx. However this is not
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* ideal because it bypasses the PK module on the control of its internal
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* structure (pk_context) fields.
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* For backward compatibility we keep mbedtls_pk_ec() when ECP_C is defined, but
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* we provide 2 very similar functions when only ECP_LIGHT is enabled and not
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* ECP_C.
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* These variants embed the "ro" or "rw" keywords in their name to make the
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* usage of the returned pointer explicit. Of course the returned value is
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* const or non-const accordingly.
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*/
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static inline const mbedtls_ecp_keypair *mbedtls_pk_ec_ro(const mbedtls_pk_context pk)
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{
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switch (mbedtls_pk_get_type(&pk)) {
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case MBEDTLS_PK_ECKEY:
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case MBEDTLS_PK_ECKEY_DH:
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case MBEDTLS_PK_ECDSA:
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return (const mbedtls_ecp_keypair *) (pk).MBEDTLS_PRIVATE(pk_ctx);
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default:
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return NULL;
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}
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}
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static inline mbedtls_ecp_keypair *mbedtls_pk_ec_rw(const mbedtls_pk_context pk)
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{
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switch (mbedtls_pk_get_type(&pk)) {
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case MBEDTLS_PK_ECKEY:
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case MBEDTLS_PK_ECKEY_DH:
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case MBEDTLS_PK_ECDSA:
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return (mbedtls_ecp_keypair *) (pk).MBEDTLS_PRIVATE(pk_ctx);
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default:
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return NULL;
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}
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}
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static inline mbedtls_ecp_group_id mbedtls_pk_get_group_id(const mbedtls_pk_context *pk)
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{
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mbedtls_ecp_group_id id;
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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if (mbedtls_pk_get_type(pk) == MBEDTLS_PK_OPAQUE) {
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psa_key_attributes_t opaque_attrs = PSA_KEY_ATTRIBUTES_INIT;
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psa_key_type_t opaque_key_type;
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psa_ecc_family_t curve;
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if (psa_get_key_attributes(pk->priv_id, &opaque_attrs) != PSA_SUCCESS) {
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return MBEDTLS_ECP_DP_NONE;
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}
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opaque_key_type = psa_get_key_type(&opaque_attrs);
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curve = PSA_KEY_TYPE_ECC_GET_FAMILY(opaque_key_type);
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id = mbedtls_ecc_group_of_psa(curve, psa_get_key_bits(&opaque_attrs), 0);
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psa_reset_key_attributes(&opaque_attrs);
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} else
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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{
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#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
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id = mbedtls_ecc_group_of_psa(pk->ec_family, pk->ec_bits, 0);
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#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
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id = mbedtls_pk_ec_ro(*pk)->grp.id;
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#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
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}
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return id;
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}
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/* Helper for Montgomery curves */
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#if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED) || defined(MBEDTLS_ECP_DP_CURVE448_ENABLED)
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#define MBEDTLS_PK_HAVE_RFC8410_CURVES
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#endif /* MBEDTLS_ECP_DP_CURVE25519_ENABLED || MBEDTLS_ECP_DP_CURVE448_ENABLED */
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#endif /* MBEDTLS_PK_HAVE_ECC_KEYS */
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#endif /* MBEDTLS_PK_INTERNAL_H */
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