632 lines
20 KiB
C
632 lines
20 KiB
C
/*
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* Public Key layer for writing key files and structures
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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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#include "common.h"
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#if defined(MBEDTLS_PK_WRITE_C)
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#include "mbedtls/pk.h"
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#include "mbedtls/asn1write.h"
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#include "mbedtls/oid.h"
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#include "mbedtls/platform_util.h"
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#include "mbedtls/error.h"
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#include <string.h>
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#if defined(MBEDTLS_RSA_C)
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#include "mbedtls/rsa.h"
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#endif
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#if defined(MBEDTLS_ECP_C)
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#include "mbedtls/bignum.h"
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#include "mbedtls/ecp.h"
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#include "mbedtls/platform_util.h"
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#endif
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#if defined(MBEDTLS_ECDSA_C)
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#include "mbedtls/ecdsa.h"
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#endif
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#if defined(MBEDTLS_PEM_WRITE_C)
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#include "mbedtls/pem.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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#include "mbedtls/psa_util.h"
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#endif
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#include "mbedtls/platform.h"
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/* Parameter validation macros based on platform_util.h */
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#define PK_VALIDATE_RET(cond) \
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MBEDTLS_INTERNAL_VALIDATE_RET(cond, MBEDTLS_ERR_PK_BAD_INPUT_DATA)
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#define PK_VALIDATE(cond) \
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MBEDTLS_INTERNAL_VALIDATE(cond)
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#if defined(MBEDTLS_RSA_C)
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/*
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* RSAPublicKey ::= SEQUENCE {
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* modulus INTEGER, -- n
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* publicExponent INTEGER -- e
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* }
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*/
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static int pk_write_rsa_pubkey(unsigned char **p, unsigned char *start,
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mbedtls_rsa_context *rsa)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t len = 0;
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mbedtls_mpi T;
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mbedtls_mpi_init(&T);
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/* Export E */
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if ((ret = mbedtls_rsa_export(rsa, NULL, NULL, NULL, NULL, &T)) != 0 ||
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(ret = mbedtls_asn1_write_mpi(p, start, &T)) < 0) {
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goto end_of_export;
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}
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len += ret;
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/* Export N */
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if ((ret = mbedtls_rsa_export(rsa, &T, NULL, NULL, NULL, NULL)) != 0 ||
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(ret = mbedtls_asn1_write_mpi(p, start, &T)) < 0) {
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goto end_of_export;
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}
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len += ret;
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end_of_export:
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mbedtls_mpi_free(&T);
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if (ret < 0) {
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return ret;
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}
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE));
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return (int) len;
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}
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#endif /* MBEDTLS_RSA_C */
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#if defined(MBEDTLS_ECP_C)
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/*
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* EC public key is an EC point
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*/
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static int pk_write_ec_pubkey(unsigned char **p, unsigned char *start,
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mbedtls_ecp_keypair *ec)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t len = 0;
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unsigned char buf[MBEDTLS_ECP_MAX_PT_LEN];
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if ((ret = mbedtls_ecp_point_write_binary(&ec->grp, &ec->Q,
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MBEDTLS_ECP_PF_UNCOMPRESSED,
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&len, buf, sizeof(buf))) != 0) {
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return ret;
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}
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if (*p < start || (size_t) (*p - start) < len) {
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return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
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}
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*p -= len;
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memcpy(*p, buf, len);
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return (int) len;
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}
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/*
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* ECParameters ::= CHOICE {
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* namedCurve OBJECT IDENTIFIER
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* }
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*/
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static int pk_write_ec_param(unsigned char **p, unsigned char *start,
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mbedtls_ecp_keypair *ec)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t len = 0;
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const char *oid;
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size_t oid_len;
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if ((ret = mbedtls_oid_get_oid_by_ec_grp(ec->grp.id, &oid, &oid_len)) != 0) {
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return ret;
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}
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_oid(p, start, oid, oid_len));
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return (int) len;
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}
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/*
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* privateKey OCTET STRING -- always of length ceil(log2(n)/8)
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*/
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static int pk_write_ec_private(unsigned char **p, unsigned char *start,
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mbedtls_ecp_keypair *ec)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t byte_length = (ec->grp.pbits + 7) / 8;
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unsigned char tmp[MBEDTLS_ECP_MAX_BYTES];
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ret = mbedtls_ecp_write_key(ec, tmp, byte_length);
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if (ret != 0) {
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goto exit;
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}
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ret = mbedtls_asn1_write_octet_string(p, start, tmp, byte_length);
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exit:
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mbedtls_platform_zeroize(tmp, byte_length);
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return ret;
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}
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#endif /* MBEDTLS_ECP_C */
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int mbedtls_pk_write_pubkey(unsigned char **p, unsigned char *start,
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const mbedtls_pk_context *key)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t len = 0;
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(void) p;
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(void) start;
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(void) key;
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(void) ret;
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PK_VALIDATE_RET(p != NULL);
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PK_VALIDATE_RET(*p != NULL);
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PK_VALIDATE_RET(start != NULL);
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PK_VALIDATE_RET(key != NULL);
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#if defined(MBEDTLS_RSA_C)
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if (mbedtls_pk_get_type(key) == MBEDTLS_PK_RSA) {
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MBEDTLS_ASN1_CHK_ADD(len, pk_write_rsa_pubkey(p, start, mbedtls_pk_rsa(*key)));
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} else
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#endif
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#if defined(MBEDTLS_ECP_C)
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if (mbedtls_pk_get_type(key) == MBEDTLS_PK_ECKEY) {
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MBEDTLS_ASN1_CHK_ADD(len, pk_write_ec_pubkey(p, start, mbedtls_pk_ec(*key)));
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} else
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#endif
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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if (mbedtls_pk_get_type(key) == MBEDTLS_PK_OPAQUE) {
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size_t buffer_size;
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psa_key_id_t *key_id = (psa_key_id_t *) key->pk_ctx;
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if (*p < start) {
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return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
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}
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buffer_size = (size_t) (*p - start);
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if (psa_export_public_key(*key_id, start, buffer_size, &len)
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!= PSA_SUCCESS) {
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return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
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} else {
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*p -= len;
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memmove(*p, start, len);
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}
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} else
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
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return (int) len;
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}
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int mbedtls_pk_write_pubkey_der(mbedtls_pk_context *key, unsigned char *buf, size_t size)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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unsigned char *c;
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size_t len = 0, par_len = 0, oid_len;
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mbedtls_pk_type_t pk_type;
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const char *oid;
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PK_VALIDATE_RET(key != NULL);
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if (size == 0) {
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return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
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}
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PK_VALIDATE_RET(buf != NULL);
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c = buf + size;
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_pk_write_pubkey(&c, buf, key));
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if (c - buf < 1) {
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return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
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}
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/*
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* SubjectPublicKeyInfo ::= SEQUENCE {
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* algorithm AlgorithmIdentifier,
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* subjectPublicKey BIT STRING }
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*/
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*--c = 0;
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len += 1;
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, len));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(&c, buf, MBEDTLS_ASN1_BIT_STRING));
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pk_type = mbedtls_pk_get_type(key);
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#if defined(MBEDTLS_ECP_C)
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if (pk_type == MBEDTLS_PK_ECKEY) {
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MBEDTLS_ASN1_CHK_ADD(par_len, pk_write_ec_param(&c, buf, mbedtls_pk_ec(*key)));
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}
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#endif
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#if defined(MBEDTLS_USE_PSA_CRYPTO)
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if (pk_type == MBEDTLS_PK_OPAQUE) {
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psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
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psa_key_type_t key_type;
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psa_key_id_t key_id;
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psa_ecc_family_t curve;
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size_t bits;
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key_id = *((psa_key_id_t *) key->pk_ctx);
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if (PSA_SUCCESS != psa_get_key_attributes(key_id, &attributes)) {
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return MBEDTLS_ERR_PK_HW_ACCEL_FAILED;
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}
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key_type = psa_get_key_type(&attributes);
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bits = psa_get_key_bits(&attributes);
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psa_reset_key_attributes(&attributes);
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curve = PSA_KEY_TYPE_ECC_GET_FAMILY(key_type);
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if (curve == 0) {
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return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
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}
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ret = mbedtls_psa_get_ecc_oid_from_id(curve, bits, &oid, &oid_len);
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if (ret != 0) {
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return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
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}
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/* Write EC algorithm parameters; that's akin
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* to pk_write_ec_param() above. */
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MBEDTLS_ASN1_CHK_ADD(par_len, mbedtls_asn1_write_oid(&c, buf,
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oid, oid_len));
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/* The rest of the function works as for legacy EC contexts. */
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pk_type = MBEDTLS_PK_ECKEY;
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}
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#endif /* MBEDTLS_USE_PSA_CRYPTO */
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if ((ret = mbedtls_oid_get_oid_by_pk_alg(pk_type, &oid,
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&oid_len)) != 0) {
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return ret;
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}
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_algorithm_identifier(&c, buf, oid, oid_len,
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par_len));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, len));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(&c, buf, MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE));
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return (int) len;
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}
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int mbedtls_pk_write_key_der(mbedtls_pk_context *key, unsigned char *buf, size_t size)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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unsigned char *c;
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size_t len = 0;
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(void) ret;
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(void) c;
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(void) key;
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PK_VALIDATE_RET(key != NULL);
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if (size == 0) {
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return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
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}
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PK_VALIDATE_RET(buf != NULL);
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c = buf + size;
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#if defined(MBEDTLS_RSA_C)
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if (mbedtls_pk_get_type(key) == MBEDTLS_PK_RSA) {
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mbedtls_mpi T; /* Temporary holding the exported parameters */
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mbedtls_rsa_context *rsa = mbedtls_pk_rsa(*key);
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/*
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* Export the parameters one after another to avoid simultaneous copies.
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*/
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mbedtls_mpi_init(&T);
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/* Export QP */
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if ((ret = mbedtls_rsa_export_crt(rsa, NULL, NULL, &T)) != 0 ||
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(ret = mbedtls_asn1_write_mpi(&c, buf, &T)) < 0) {
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goto end_of_export;
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}
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len += ret;
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/* Export DQ */
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if ((ret = mbedtls_rsa_export_crt(rsa, NULL, &T, NULL)) != 0 ||
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(ret = mbedtls_asn1_write_mpi(&c, buf, &T)) < 0) {
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goto end_of_export;
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}
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len += ret;
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/* Export DP */
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if ((ret = mbedtls_rsa_export_crt(rsa, &T, NULL, NULL)) != 0 ||
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(ret = mbedtls_asn1_write_mpi(&c, buf, &T)) < 0) {
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goto end_of_export;
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}
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len += ret;
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/* Export Q */
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if ((ret = mbedtls_rsa_export(rsa, NULL, NULL,
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&T, NULL, NULL)) != 0 ||
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(ret = mbedtls_asn1_write_mpi(&c, buf, &T)) < 0) {
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goto end_of_export;
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}
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len += ret;
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/* Export P */
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if ((ret = mbedtls_rsa_export(rsa, NULL, &T,
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NULL, NULL, NULL)) != 0 ||
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(ret = mbedtls_asn1_write_mpi(&c, buf, &T)) < 0) {
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goto end_of_export;
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}
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len += ret;
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/* Export D */
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if ((ret = mbedtls_rsa_export(rsa, NULL, NULL,
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NULL, &T, NULL)) != 0 ||
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(ret = mbedtls_asn1_write_mpi(&c, buf, &T)) < 0) {
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goto end_of_export;
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}
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len += ret;
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/* Export E */
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if ((ret = mbedtls_rsa_export(rsa, NULL, NULL,
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NULL, NULL, &T)) != 0 ||
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(ret = mbedtls_asn1_write_mpi(&c, buf, &T)) < 0) {
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goto end_of_export;
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}
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len += ret;
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/* Export N */
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if ((ret = mbedtls_rsa_export(rsa, &T, NULL,
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NULL, NULL, NULL)) != 0 ||
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(ret = mbedtls_asn1_write_mpi(&c, buf, &T)) < 0) {
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goto end_of_export;
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}
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len += ret;
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end_of_export:
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mbedtls_mpi_free(&T);
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if (ret < 0) {
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return ret;
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}
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_int(&c, buf, 0));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, len));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(&c,
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buf, MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE));
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} else
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#endif /* MBEDTLS_RSA_C */
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#if defined(MBEDTLS_ECP_C)
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if (mbedtls_pk_get_type(key) == MBEDTLS_PK_ECKEY) {
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mbedtls_ecp_keypair *ec = mbedtls_pk_ec(*key);
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size_t pub_len = 0, par_len = 0;
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/*
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* RFC 5915, or SEC1 Appendix C.4
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*
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* ECPrivateKey ::= SEQUENCE {
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* version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
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* privateKey OCTET STRING,
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* parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
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* publicKey [1] BIT STRING OPTIONAL
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* }
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*/
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/* publicKey */
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MBEDTLS_ASN1_CHK_ADD(pub_len, pk_write_ec_pubkey(&c, buf, ec));
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if (c - buf < 1) {
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return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
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}
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*--c = 0;
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pub_len += 1;
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MBEDTLS_ASN1_CHK_ADD(pub_len, mbedtls_asn1_write_len(&c, buf, pub_len));
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MBEDTLS_ASN1_CHK_ADD(pub_len, mbedtls_asn1_write_tag(&c, buf, MBEDTLS_ASN1_BIT_STRING));
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MBEDTLS_ASN1_CHK_ADD(pub_len, mbedtls_asn1_write_len(&c, buf, pub_len));
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MBEDTLS_ASN1_CHK_ADD(pub_len, mbedtls_asn1_write_tag(&c, buf,
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MBEDTLS_ASN1_CONTEXT_SPECIFIC |
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MBEDTLS_ASN1_CONSTRUCTED | 1));
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len += pub_len;
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/* parameters */
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MBEDTLS_ASN1_CHK_ADD(par_len, pk_write_ec_param(&c, buf, ec));
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MBEDTLS_ASN1_CHK_ADD(par_len, mbedtls_asn1_write_len(&c, buf, par_len));
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MBEDTLS_ASN1_CHK_ADD(par_len, mbedtls_asn1_write_tag(&c, buf,
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MBEDTLS_ASN1_CONTEXT_SPECIFIC |
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MBEDTLS_ASN1_CONSTRUCTED | 0));
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len += par_len;
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/* privateKey */
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MBEDTLS_ASN1_CHK_ADD(len, pk_write_ec_private(&c, buf, ec));
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/* version */
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_int(&c, buf, 1));
|
|
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, len));
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(&c, buf, MBEDTLS_ASN1_CONSTRUCTED |
|
|
MBEDTLS_ASN1_SEQUENCE));
|
|
} else
|
|
#endif /* MBEDTLS_ECP_C */
|
|
return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
|
|
|
|
return (int) len;
|
|
}
|
|
|
|
#if defined(MBEDTLS_PEM_WRITE_C)
|
|
|
|
#define PEM_BEGIN_PUBLIC_KEY "-----BEGIN PUBLIC KEY-----\n"
|
|
#define PEM_END_PUBLIC_KEY "-----END PUBLIC KEY-----\n"
|
|
|
|
#define PEM_BEGIN_PRIVATE_KEY_RSA "-----BEGIN RSA PRIVATE KEY-----\n"
|
|
#define PEM_END_PRIVATE_KEY_RSA "-----END RSA PRIVATE KEY-----\n"
|
|
#define PEM_BEGIN_PRIVATE_KEY_EC "-----BEGIN EC PRIVATE KEY-----\n"
|
|
#define PEM_END_PRIVATE_KEY_EC "-----END EC PRIVATE KEY-----\n"
|
|
|
|
/*
|
|
* Max sizes of key per types. Shown as tag + len (+ content).
|
|
*/
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
/*
|
|
* RSA public keys:
|
|
* SubjectPublicKeyInfo ::= SEQUENCE { 1 + 3
|
|
* algorithm AlgorithmIdentifier, 1 + 1 (sequence)
|
|
* + 1 + 1 + 9 (rsa oid)
|
|
* + 1 + 1 (params null)
|
|
* subjectPublicKey BIT STRING } 1 + 3 + (1 + below)
|
|
* RSAPublicKey ::= SEQUENCE { 1 + 3
|
|
* modulus INTEGER, -- n 1 + 3 + MPI_MAX + 1
|
|
* publicExponent INTEGER -- e 1 + 3 + MPI_MAX + 1
|
|
* }
|
|
*/
|
|
#define RSA_PUB_DER_MAX_BYTES (38 + 2 * MBEDTLS_MPI_MAX_SIZE)
|
|
|
|
/*
|
|
* RSA private keys:
|
|
* RSAPrivateKey ::= SEQUENCE { 1 + 3
|
|
* version Version, 1 + 1 + 1
|
|
* modulus INTEGER, 1 + 3 + MPI_MAX + 1
|
|
* publicExponent INTEGER, 1 + 3 + MPI_MAX + 1
|
|
* privateExponent INTEGER, 1 + 3 + MPI_MAX + 1
|
|
* prime1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
|
|
* prime2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
|
|
* exponent1 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
|
|
* exponent2 INTEGER, 1 + 3 + MPI_MAX / 2 + 1
|
|
* coefficient INTEGER, 1 + 3 + MPI_MAX / 2 + 1
|
|
* otherPrimeInfos OtherPrimeInfos OPTIONAL 0 (not supported)
|
|
* }
|
|
*/
|
|
#define MPI_MAX_SIZE_2 (MBEDTLS_MPI_MAX_SIZE / 2 + \
|
|
MBEDTLS_MPI_MAX_SIZE % 2)
|
|
#define RSA_PRV_DER_MAX_BYTES (47 + 3 * MBEDTLS_MPI_MAX_SIZE \
|
|
+ 5 * MPI_MAX_SIZE_2)
|
|
|
|
#else /* MBEDTLS_RSA_C */
|
|
|
|
#define RSA_PUB_DER_MAX_BYTES 0
|
|
#define RSA_PRV_DER_MAX_BYTES 0
|
|
|
|
#endif /* MBEDTLS_RSA_C */
|
|
|
|
#if defined(MBEDTLS_ECP_C)
|
|
/*
|
|
* EC public keys:
|
|
* SubjectPublicKeyInfo ::= SEQUENCE { 1 + 2
|
|
* algorithm AlgorithmIdentifier, 1 + 1 (sequence)
|
|
* + 1 + 1 + 7 (ec oid)
|
|
* + 1 + 1 + 9 (namedCurve oid)
|
|
* subjectPublicKey BIT STRING 1 + 2 + 1 [1]
|
|
* + 1 (point format) [1]
|
|
* + 2 * ECP_MAX (coords) [1]
|
|
* }
|
|
*/
|
|
#define ECP_PUB_DER_MAX_BYTES (30 + 2 * MBEDTLS_ECP_MAX_BYTES)
|
|
|
|
/*
|
|
* EC private keys:
|
|
* ECPrivateKey ::= SEQUENCE { 1 + 2
|
|
* version INTEGER , 1 + 1 + 1
|
|
* privateKey OCTET STRING, 1 + 1 + ECP_MAX
|
|
* parameters [0] ECParameters OPTIONAL, 1 + 1 + (1 + 1 + 9)
|
|
* publicKey [1] BIT STRING OPTIONAL 1 + 2 + [1] above
|
|
* }
|
|
*/
|
|
#define ECP_PRV_DER_MAX_BYTES (29 + 3 * MBEDTLS_ECP_MAX_BYTES)
|
|
|
|
#else /* MBEDTLS_ECP_C */
|
|
|
|
#define ECP_PUB_DER_MAX_BYTES 0
|
|
#define ECP_PRV_DER_MAX_BYTES 0
|
|
|
|
#endif /* MBEDTLS_ECP_C */
|
|
|
|
#define PUB_DER_MAX_BYTES (RSA_PUB_DER_MAX_BYTES > ECP_PUB_DER_MAX_BYTES ? \
|
|
RSA_PUB_DER_MAX_BYTES : ECP_PUB_DER_MAX_BYTES)
|
|
#define PRV_DER_MAX_BYTES (RSA_PRV_DER_MAX_BYTES > ECP_PRV_DER_MAX_BYTES ? \
|
|
RSA_PRV_DER_MAX_BYTES : ECP_PRV_DER_MAX_BYTES)
|
|
|
|
int mbedtls_pk_write_pubkey_pem(mbedtls_pk_context *key, unsigned char *buf, size_t size)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
unsigned char output_buf[PUB_DER_MAX_BYTES];
|
|
size_t olen = 0;
|
|
|
|
PK_VALIDATE_RET(key != NULL);
|
|
PK_VALIDATE_RET(buf != NULL || size == 0);
|
|
|
|
if ((ret = mbedtls_pk_write_pubkey_der(key, output_buf,
|
|
sizeof(output_buf))) < 0) {
|
|
return ret;
|
|
}
|
|
|
|
if ((ret = mbedtls_pem_write_buffer(PEM_BEGIN_PUBLIC_KEY, PEM_END_PUBLIC_KEY,
|
|
output_buf + sizeof(output_buf) - ret,
|
|
ret, buf, size, &olen)) != 0) {
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int mbedtls_pk_write_key_pem(mbedtls_pk_context *key, unsigned char *buf, size_t size)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
unsigned char output_buf[PRV_DER_MAX_BYTES];
|
|
const char *begin, *end;
|
|
size_t olen = 0;
|
|
|
|
PK_VALIDATE_RET(key != NULL);
|
|
PK_VALIDATE_RET(buf != NULL || size == 0);
|
|
|
|
if ((ret = mbedtls_pk_write_key_der(key, output_buf, sizeof(output_buf))) < 0) {
|
|
return ret;
|
|
}
|
|
|
|
#if defined(MBEDTLS_RSA_C)
|
|
if (mbedtls_pk_get_type(key) == MBEDTLS_PK_RSA) {
|
|
begin = PEM_BEGIN_PRIVATE_KEY_RSA;
|
|
end = PEM_END_PRIVATE_KEY_RSA;
|
|
} else
|
|
#endif
|
|
#if defined(MBEDTLS_ECP_C)
|
|
if (mbedtls_pk_get_type(key) == MBEDTLS_PK_ECKEY) {
|
|
begin = PEM_BEGIN_PRIVATE_KEY_EC;
|
|
end = PEM_END_PRIVATE_KEY_EC;
|
|
} else
|
|
#endif
|
|
return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
|
|
|
|
if ((ret = mbedtls_pem_write_buffer(begin, end,
|
|
output_buf + sizeof(output_buf) - ret,
|
|
ret, buf, size, &olen)) != 0) {
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* MBEDTLS_PEM_WRITE_C */
|
|
|
|
#endif /* MBEDTLS_PK_WRITE_C */
|