[398] | 1 | /*
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| 2 | * X.509 certificate writing
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| 3 | *
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| 4 | * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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| 5 | * SPDX-License-Identifier: Apache-2.0
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| 6 | *
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| 7 | * Licensed under the Apache License, Version 2.0 (the "License"); you may
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| 8 | * not use this file except in compliance with the License.
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| 9 | * You may obtain a copy of the License at
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| 10 | *
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| 11 | * http://www.apache.org/licenses/LICENSE-2.0
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| 12 | *
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| 13 | * Unless required by applicable law or agreed to in writing, software
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| 14 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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| 15 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 16 | * See the License for the specific language governing permissions and
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| 17 | * limitations under the License.
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| 18 | *
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| 19 | * This file is part of mbed TLS (https://tls.mbed.org)
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| 20 | */
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| 21 | /*
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| 22 | * References:
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| 23 | * - certificates: RFC 5280, updated by RFC 6818
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| 24 | * - CSRs: PKCS#10 v1.7 aka RFC 2986
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| 25 | * - attributes: PKCS#9 v2.0 aka RFC 2985
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| 26 | */
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| 27 |
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| 28 | #if !defined(MBEDTLS_CONFIG_FILE)
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| 29 | #include "mbedtls/config.h"
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| 30 | #else
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| 31 | #include MBEDTLS_CONFIG_FILE
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| 32 | #endif
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| 33 |
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| 34 | #if defined(MBEDTLS_X509_CRT_WRITE_C)
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| 35 |
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| 36 | #include "mbedtls/x509_crt.h"
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| 37 | #include "mbedtls/oid.h"
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| 38 | #include "mbedtls/asn1write.h"
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| 39 | #include "mbedtls/sha1.h"
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| 40 | #include "mbedtls/platform_util.h"
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| 41 |
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| 42 | #include <string.h>
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| 43 |
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| 44 | #if defined(MBEDTLS_PEM_WRITE_C)
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| 45 | #include "mbedtls/pem.h"
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| 46 | #endif /* MBEDTLS_PEM_WRITE_C */
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| 47 |
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| 48 | void mbedtls_x509write_crt_init( mbedtls_x509write_cert *ctx )
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| 49 | {
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| 50 | memset( ctx, 0, sizeof( mbedtls_x509write_cert ) );
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| 51 |
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| 52 | mbedtls_mpi_init( &ctx->serial );
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| 53 | ctx->version = MBEDTLS_X509_CRT_VERSION_3;
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| 54 | }
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| 55 |
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| 56 | void mbedtls_x509write_crt_free( mbedtls_x509write_cert *ctx )
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| 57 | {
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| 58 | mbedtls_mpi_free( &ctx->serial );
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| 59 |
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| 60 | mbedtls_asn1_free_named_data_list( &ctx->subject );
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| 61 | mbedtls_asn1_free_named_data_list( &ctx->issuer );
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| 62 | mbedtls_asn1_free_named_data_list( &ctx->extensions );
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| 63 |
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| 64 | mbedtls_platform_zeroize( ctx, sizeof( mbedtls_x509write_cert ) );
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| 65 | }
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| 66 |
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| 67 | void mbedtls_x509write_crt_set_version( mbedtls_x509write_cert *ctx, int version )
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| 68 | {
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| 69 | ctx->version = version;
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| 70 | }
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| 71 |
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| 72 | void mbedtls_x509write_crt_set_md_alg( mbedtls_x509write_cert *ctx, mbedtls_md_type_t md_alg )
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| 73 | {
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| 74 | ctx->md_alg = md_alg;
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| 75 | }
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| 76 |
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| 77 | void mbedtls_x509write_crt_set_subject_key( mbedtls_x509write_cert *ctx, mbedtls_pk_context *key )
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| 78 | {
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| 79 | ctx->subject_key = key;
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| 80 | }
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| 81 |
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| 82 | void mbedtls_x509write_crt_set_issuer_key( mbedtls_x509write_cert *ctx, mbedtls_pk_context *key )
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| 83 | {
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| 84 | ctx->issuer_key = key;
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| 85 | }
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| 86 |
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| 87 | int mbedtls_x509write_crt_set_subject_name( mbedtls_x509write_cert *ctx,
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| 88 | const char *subject_name )
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| 89 | {
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| 90 | return mbedtls_x509_string_to_names( &ctx->subject, subject_name );
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| 91 | }
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| 92 |
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| 93 | int mbedtls_x509write_crt_set_issuer_name( mbedtls_x509write_cert *ctx,
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| 94 | const char *issuer_name )
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| 95 | {
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| 96 | return mbedtls_x509_string_to_names( &ctx->issuer, issuer_name );
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| 97 | }
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| 98 |
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| 99 | int mbedtls_x509write_crt_set_serial( mbedtls_x509write_cert *ctx, const mbedtls_mpi *serial )
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| 100 | {
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| 101 | int ret;
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| 102 |
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| 103 | if( ( ret = mbedtls_mpi_copy( &ctx->serial, serial ) ) != 0 )
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| 104 | return( ret );
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| 105 |
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| 106 | return( 0 );
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| 107 | }
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| 108 |
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| 109 | int mbedtls_x509write_crt_set_validity( mbedtls_x509write_cert *ctx, const char *not_before,
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| 110 | const char *not_after )
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| 111 | {
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| 112 | if( strlen( not_before ) != MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1 ||
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| 113 | strlen( not_after ) != MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1 )
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| 114 | {
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| 115 | return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
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| 116 | }
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| 117 | strncpy( ctx->not_before, not_before, MBEDTLS_X509_RFC5280_UTC_TIME_LEN );
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| 118 | strncpy( ctx->not_after , not_after , MBEDTLS_X509_RFC5280_UTC_TIME_LEN );
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| 119 | ctx->not_before[MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1] = 'Z';
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| 120 | ctx->not_after[MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1] = 'Z';
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| 121 |
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| 122 | return( 0 );
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| 123 | }
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| 124 |
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| 125 | int mbedtls_x509write_crt_set_extension( mbedtls_x509write_cert *ctx,
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| 126 | const char *oid, size_t oid_len,
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| 127 | int critical,
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| 128 | const unsigned char *val, size_t val_len )
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| 129 | {
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| 130 | return mbedtls_x509_set_extension( &ctx->extensions, oid, oid_len,
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| 131 | critical, val, val_len );
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| 132 | }
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| 133 |
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| 134 | int mbedtls_x509write_crt_set_basic_constraints( mbedtls_x509write_cert *ctx,
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| 135 | int is_ca, int max_pathlen )
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| 136 | {
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| 137 | int ret;
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| 138 | unsigned char buf[9];
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| 139 | unsigned char *c = buf + sizeof(buf);
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| 140 | size_t len = 0;
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| 141 |
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| 142 | memset( buf, 0, sizeof(buf) );
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| 143 |
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| 144 | if( is_ca && max_pathlen > 127 )
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| 145 | return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
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| 146 |
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| 147 | if( is_ca )
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| 148 | {
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| 149 | if( max_pathlen >= 0 )
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| 150 | {
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| 151 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, max_pathlen ) );
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| 152 | }
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| 153 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_bool( &c, buf, 1 ) );
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| 154 | }
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| 155 |
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| 156 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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| 157 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
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| 158 | MBEDTLS_ASN1_SEQUENCE ) );
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| 159 |
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| 160 | return mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_BASIC_CONSTRAINTS,
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| 161 | MBEDTLS_OID_SIZE( MBEDTLS_OID_BASIC_CONSTRAINTS ),
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| 162 | 0, buf + sizeof(buf) - len, len );
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| 163 | }
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| 164 |
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| 165 | #if defined(MBEDTLS_SHA1_C)
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| 166 | int mbedtls_x509write_crt_set_subject_key_identifier( mbedtls_x509write_cert *ctx )
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| 167 | {
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| 168 | int ret;
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| 169 | unsigned char buf[MBEDTLS_MPI_MAX_SIZE * 2 + 20]; /* tag, length + 2xMPI */
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| 170 | unsigned char *c = buf + sizeof(buf);
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| 171 | size_t len = 0;
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| 172 |
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| 173 | memset( buf, 0, sizeof(buf) );
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| 174 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, ctx->subject_key ) );
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| 175 |
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| 176 | ret = mbedtls_sha1_ret( buf + sizeof( buf ) - len, len,
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| 177 | buf + sizeof( buf ) - 20 );
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| 178 | if( ret != 0 )
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| 179 | return( ret );
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| 180 | c = buf + sizeof( buf ) - 20;
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| 181 | len = 20;
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| 182 |
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| 183 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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| 184 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_OCTET_STRING ) );
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| 185 |
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| 186 | return mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_SUBJECT_KEY_IDENTIFIER,
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| 187 | MBEDTLS_OID_SIZE( MBEDTLS_OID_SUBJECT_KEY_IDENTIFIER ),
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| 188 | 0, buf + sizeof(buf) - len, len );
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| 189 | }
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| 190 |
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| 191 | int mbedtls_x509write_crt_set_authority_key_identifier( mbedtls_x509write_cert *ctx )
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| 192 | {
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| 193 | int ret;
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| 194 | unsigned char buf[MBEDTLS_MPI_MAX_SIZE * 2 + 20]; /* tag, length + 2xMPI */
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| 195 | unsigned char *c = buf + sizeof( buf );
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| 196 | size_t len = 0;
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| 197 |
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| 198 | memset( buf, 0, sizeof(buf) );
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| 199 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, ctx->issuer_key ) );
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| 200 |
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| 201 | ret = mbedtls_sha1_ret( buf + sizeof( buf ) - len, len,
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| 202 | buf + sizeof( buf ) - 20 );
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| 203 | if( ret != 0 )
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| 204 | return( ret );
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| 205 | c = buf + sizeof( buf ) - 20;
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| 206 | len = 20;
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| 207 |
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| 208 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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| 209 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONTEXT_SPECIFIC | 0 ) );
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| 210 |
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| 211 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
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| 212 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
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| 213 | MBEDTLS_ASN1_SEQUENCE ) );
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| 214 |
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| 215 | return mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_AUTHORITY_KEY_IDENTIFIER,
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| 216 | MBEDTLS_OID_SIZE( MBEDTLS_OID_AUTHORITY_KEY_IDENTIFIER ),
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| 217 | 0, buf + sizeof( buf ) - len, len );
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| 218 | }
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| 219 | #endif /* MBEDTLS_SHA1_C */
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| 220 |
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| 221 | static size_t crt_get_unused_bits_for_named_bitstring( unsigned char bitstring,
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| 222 | size_t bit_offset )
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| 223 | {
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| 224 | size_t unused_bits;
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| 225 |
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| 226 | /* Count the unused bits removing trailing 0s */
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| 227 | for( unused_bits = bit_offset; unused_bits < 8; unused_bits++ )
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| 228 | if( ( ( bitstring >> unused_bits ) & 0x1 ) != 0 )
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| 229 | break;
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| 230 |
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| 231 | return( unused_bits );
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| 232 | }
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| 233 |
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| 234 | int mbedtls_x509write_crt_set_key_usage( mbedtls_x509write_cert *ctx,
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| 235 | unsigned int key_usage )
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| 236 | {
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| 237 | unsigned char buf[4], ku;
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| 238 | unsigned char *c;
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| 239 | int ret;
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| 240 | size_t unused_bits;
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| 241 | const unsigned int allowed_bits = MBEDTLS_X509_KU_DIGITAL_SIGNATURE |
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| 242 | MBEDTLS_X509_KU_NON_REPUDIATION |
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| 243 | MBEDTLS_X509_KU_KEY_ENCIPHERMENT |
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| 244 | MBEDTLS_X509_KU_DATA_ENCIPHERMENT |
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| 245 | MBEDTLS_X509_KU_KEY_AGREEMENT |
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| 246 | MBEDTLS_X509_KU_KEY_CERT_SIGN |
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| 247 | MBEDTLS_X509_KU_CRL_SIGN;
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| 248 |
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| 249 | /* Check that nothing other than the allowed flags is set */
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| 250 | if( ( key_usage & ~allowed_bits ) != 0 )
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| 251 | return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
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| 252 |
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| 253 | c = buf + 4;
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| 254 | ku = (unsigned char)key_usage;
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| 255 | unused_bits = crt_get_unused_bits_for_named_bitstring( ku, 1 );
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| 256 | ret = mbedtls_asn1_write_bitstring( &c, buf, &ku, 8 - unused_bits );
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| 257 |
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| 258 | if( ret < 0 )
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| 259 | return( ret );
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| 260 | else if( ret < 3 || ret > 4 )
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| 261 | return( MBEDTLS_ERR_X509_INVALID_FORMAT );
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| 262 |
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| 263 | ret = mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_KEY_USAGE,
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| 264 | MBEDTLS_OID_SIZE( MBEDTLS_OID_KEY_USAGE ),
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| 265 | 1, c, (size_t)ret );
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| 266 | if( ret != 0 )
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| 267 | return( ret );
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| 268 |
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| 269 | return( 0 );
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| 270 | }
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| 271 |
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| 272 | int mbedtls_x509write_crt_set_ns_cert_type( mbedtls_x509write_cert *ctx,
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| 273 | unsigned char ns_cert_type )
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| 274 | {
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| 275 | unsigned char buf[4];
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| 276 | unsigned char *c;
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| 277 | size_t unused_bits;
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| 278 | int ret;
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| 279 |
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| 280 | c = buf + 4;
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| 281 |
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| 282 | unused_bits = crt_get_unused_bits_for_named_bitstring( ns_cert_type, 0 );
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| 283 | ret = mbedtls_asn1_write_bitstring( &c,
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| 284 | buf,
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| 285 | &ns_cert_type,
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| 286 | 8 - unused_bits );
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| 287 | if( ret < 3 || ret > 4 )
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| 288 | return( ret );
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| 289 |
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| 290 | ret = mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_NS_CERT_TYPE,
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| 291 | MBEDTLS_OID_SIZE( MBEDTLS_OID_NS_CERT_TYPE ),
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| 292 | 0, c, (size_t)ret );
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| 293 | if( ret != 0 )
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| 294 | return( ret );
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| 295 |
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| 296 | return( 0 );
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| 297 | }
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| 298 |
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| 299 | static int x509_write_time( unsigned char **p, unsigned char *start,
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| 300 | const char *t, size_t size )
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| 301 | {
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| 302 | int ret;
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| 303 | size_t len = 0;
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| 304 |
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| 305 | /*
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| 306 | * write MBEDTLS_ASN1_UTC_TIME if year < 2050 (2 bytes shorter)
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| 307 | */
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| 308 | if( t[0] == '2' && t[1] == '0' && t[2] < '5' )
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| 309 | {
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| 310 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start,
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| 311 | (const unsigned char *) t + 2,
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| 312 | size - 2 ) );
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| 313 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
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| 314 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_UTC_TIME ) );
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| 315 | }
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| 316 | else
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| 317 | {
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| 318 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start,
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| 319 | (const unsigned char *) t,
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| 320 | size ) );
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| 321 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
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| 322 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_GENERALIZED_TIME ) );
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| 323 | }
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| 324 |
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| 325 | return( (int) len );
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| 326 | }
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| 327 |
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| 328 | int mbedtls_x509write_crt_der( mbedtls_x509write_cert *ctx, unsigned char *buf, size_t size,
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| 329 | int (*f_rng)(void *, unsigned char *, size_t),
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| 330 | void *p_rng )
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| 331 | {
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| 332 | int ret;
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| 333 | const char *sig_oid;
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| 334 | size_t sig_oid_len = 0;
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| 335 | unsigned char *c, *c2;
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| 336 | unsigned char hash[64];
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| 337 | unsigned char sig[MBEDTLS_MPI_MAX_SIZE];
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| 338 | unsigned char tmp_buf[2048];
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| 339 | size_t sub_len = 0, pub_len = 0, sig_and_oid_len = 0, sig_len;
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| 340 | size_t len = 0;
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| 341 | mbedtls_pk_type_t pk_alg;
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| 342 |
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| 343 | /*
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| 344 | * Prepare data to be signed in tmp_buf
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| 345 | */
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| 346 | c = tmp_buf + sizeof( tmp_buf );
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| 347 |
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| 348 | /* Signature algorithm needed in TBS, and later for actual signature */
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| 349 |
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| 350 | /* There's no direct way of extracting a signature algorithm
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| 351 | * (represented as an element of mbedtls_pk_type_t) from a PK instance. */
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| 352 | if( mbedtls_pk_can_do( ctx->issuer_key, MBEDTLS_PK_RSA ) )
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| 353 | pk_alg = MBEDTLS_PK_RSA;
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| 354 | else if( mbedtls_pk_can_do( ctx->issuer_key, MBEDTLS_PK_ECDSA ) )
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| 355 | pk_alg = MBEDTLS_PK_ECDSA;
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| 356 | else
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| 357 | return( MBEDTLS_ERR_X509_INVALID_ALG );
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| 358 |
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| 359 | if( ( ret = mbedtls_oid_get_oid_by_sig_alg( pk_alg, ctx->md_alg,
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| 360 | &sig_oid, &sig_oid_len ) ) != 0 )
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| 361 | {
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| 362 | return( ret );
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| 363 | }
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| 364 |
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| 365 | /*
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| 366 | * Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension
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| 367 | */
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| 368 |
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| 369 | /* Only for v3 */
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| 370 | if( ctx->version == MBEDTLS_X509_CRT_VERSION_3 )
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| 371 | {
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| 372 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_extensions( &c, tmp_buf, ctx->extensions ) );
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| 373 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
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| 374 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
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| 375 | MBEDTLS_ASN1_SEQUENCE ) );
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| 376 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
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| 377 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONTEXT_SPECIFIC |
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| 378 | MBEDTLS_ASN1_CONSTRUCTED | 3 ) );
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| 379 | }
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| 380 |
|
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| 381 | /*
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| 382 | * SubjectPublicKeyInfo
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| 383 | */
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| 384 | MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_pk_write_pubkey_der( ctx->subject_key,
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| 385 | tmp_buf, c - tmp_buf ) );
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| 386 | c -= pub_len;
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| 387 | len += pub_len;
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| 388 |
|
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| 389 | /*
|
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| 390 | * Subject ::= Name
|
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| 391 | */
|
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| 392 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_names( &c, tmp_buf, ctx->subject ) );
|
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| 393 |
|
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| 394 | /*
|
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| 395 | * Validity ::= SEQUENCE {
|
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| 396 | * notBefore Time,
|
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| 397 | * notAfter Time }
|
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| 398 | */
|
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| 399 | sub_len = 0;
|
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| 400 |
|
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| 401 | MBEDTLS_ASN1_CHK_ADD( sub_len, x509_write_time( &c, tmp_buf, ctx->not_after,
|
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| 402 | MBEDTLS_X509_RFC5280_UTC_TIME_LEN ) );
|
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| 403 |
|
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| 404 | MBEDTLS_ASN1_CHK_ADD( sub_len, x509_write_time( &c, tmp_buf, ctx->not_before,
|
---|
| 405 | MBEDTLS_X509_RFC5280_UTC_TIME_LEN ) );
|
---|
| 406 |
|
---|
| 407 | len += sub_len;
|
---|
| 408 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, sub_len ) );
|
---|
| 409 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
|
---|
| 410 | MBEDTLS_ASN1_SEQUENCE ) );
|
---|
| 411 |
|
---|
| 412 | /*
|
---|
| 413 | * Issuer ::= Name
|
---|
| 414 | */
|
---|
| 415 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_names( &c, tmp_buf, ctx->issuer ) );
|
---|
| 416 |
|
---|
| 417 | /*
|
---|
| 418 | * Signature ::= AlgorithmIdentifier
|
---|
| 419 | */
|
---|
| 420 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier( &c, tmp_buf,
|
---|
| 421 | sig_oid, strlen( sig_oid ), 0 ) );
|
---|
| 422 |
|
---|
| 423 | /*
|
---|
| 424 | * Serial ::= INTEGER
|
---|
| 425 | */
|
---|
| 426 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, tmp_buf, &ctx->serial ) );
|
---|
| 427 |
|
---|
| 428 | /*
|
---|
| 429 | * Version ::= INTEGER { v1(0), v2(1), v3(2) }
|
---|
| 430 | */
|
---|
| 431 |
|
---|
| 432 | /* Can be omitted for v1 */
|
---|
| 433 | if( ctx->version != MBEDTLS_X509_CRT_VERSION_1 )
|
---|
| 434 | {
|
---|
| 435 | sub_len = 0;
|
---|
| 436 | MBEDTLS_ASN1_CHK_ADD( sub_len, mbedtls_asn1_write_int( &c, tmp_buf, ctx->version ) );
|
---|
| 437 | len += sub_len;
|
---|
| 438 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, sub_len ) );
|
---|
| 439 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONTEXT_SPECIFIC |
|
---|
| 440 | MBEDTLS_ASN1_CONSTRUCTED | 0 ) );
|
---|
| 441 | }
|
---|
| 442 |
|
---|
| 443 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
|
---|
| 444 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
|
---|
| 445 | MBEDTLS_ASN1_SEQUENCE ) );
|
---|
| 446 |
|
---|
| 447 | /*
|
---|
| 448 | * Make signature
|
---|
| 449 | */
|
---|
| 450 | if( ( ret = mbedtls_md( mbedtls_md_info_from_type( ctx->md_alg ), c,
|
---|
| 451 | len, hash ) ) != 0 )
|
---|
| 452 | {
|
---|
| 453 | return( ret );
|
---|
| 454 | }
|
---|
| 455 |
|
---|
| 456 | if( ( ret = mbedtls_pk_sign( ctx->issuer_key, ctx->md_alg, hash, 0, sig, &sig_len,
|
---|
| 457 | f_rng, p_rng ) ) != 0 )
|
---|
| 458 | {
|
---|
| 459 | return( ret );
|
---|
| 460 | }
|
---|
| 461 |
|
---|
| 462 | /*
|
---|
| 463 | * Write data to output buffer
|
---|
| 464 | */
|
---|
| 465 | c2 = buf + size;
|
---|
| 466 | MBEDTLS_ASN1_CHK_ADD( sig_and_oid_len, mbedtls_x509_write_sig( &c2, buf,
|
---|
| 467 | sig_oid, sig_oid_len, sig, sig_len ) );
|
---|
| 468 |
|
---|
| 469 | if( len > (size_t)( c2 - buf ) )
|
---|
| 470 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
|
---|
| 471 |
|
---|
| 472 | c2 -= len;
|
---|
| 473 | memcpy( c2, c, len );
|
---|
| 474 |
|
---|
| 475 | len += sig_and_oid_len;
|
---|
| 476 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c2, buf, len ) );
|
---|
| 477 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c2, buf, MBEDTLS_ASN1_CONSTRUCTED |
|
---|
| 478 | MBEDTLS_ASN1_SEQUENCE ) );
|
---|
| 479 |
|
---|
| 480 | return( (int) len );
|
---|
| 481 | }
|
---|
| 482 |
|
---|
| 483 | #define PEM_BEGIN_CRT "-----BEGIN CERTIFICATE-----\n"
|
---|
| 484 | #define PEM_END_CRT "-----END CERTIFICATE-----\n"
|
---|
| 485 |
|
---|
| 486 | #if defined(MBEDTLS_PEM_WRITE_C)
|
---|
| 487 | int mbedtls_x509write_crt_pem( mbedtls_x509write_cert *crt, unsigned char *buf, size_t size,
|
---|
| 488 | int (*f_rng)(void *, unsigned char *, size_t),
|
---|
| 489 | void *p_rng )
|
---|
| 490 | {
|
---|
| 491 | int ret;
|
---|
| 492 | unsigned char output_buf[4096];
|
---|
| 493 | size_t olen = 0;
|
---|
| 494 |
|
---|
| 495 | if( ( ret = mbedtls_x509write_crt_der( crt, output_buf, sizeof(output_buf),
|
---|
| 496 | f_rng, p_rng ) ) < 0 )
|
---|
| 497 | {
|
---|
| 498 | return( ret );
|
---|
| 499 | }
|
---|
| 500 |
|
---|
| 501 | if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_CRT, PEM_END_CRT,
|
---|
| 502 | output_buf + sizeof(output_buf) - ret,
|
---|
| 503 | ret, buf, size, &olen ) ) != 0 )
|
---|
| 504 | {
|
---|
| 505 | return( ret );
|
---|
| 506 | }
|
---|
| 507 |
|
---|
| 508 | return( 0 );
|
---|
| 509 | }
|
---|
| 510 | #endif /* MBEDTLS_PEM_WRITE_C */
|
---|
| 511 |
|
---|
| 512 | #endif /* MBEDTLS_X509_CRT_WRITE_C */
|
---|