Marco Zecchini / Mbed OS Example_RTOS

Rtos API example

mbed-os/features/mbedtls/src/x509write_crt.c@0:9fca2b23d0ba, 2019-02-23 (annotated)

Committer:
marcozecchini
Date:
Sat Feb 23 12:13:36 2019 +0000
Revision:
0:9fca2b23d0ba
final commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
marcozecchini 0:9fca2b23d0ba 1 /*
marcozecchini 0:9fca2b23d0ba 2 * X.509 certificate writing
marcozecchini 0:9fca2b23d0ba 3 *
marcozecchini 0:9fca2b23d0ba 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
marcozecchini 0:9fca2b23d0ba 5 * SPDX-License-Identifier: Apache-2.0
marcozecchini 0:9fca2b23d0ba 6 *
marcozecchini 0:9fca2b23d0ba 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
marcozecchini 0:9fca2b23d0ba 8 * not use this file except in compliance with the License.
marcozecchini 0:9fca2b23d0ba 9 * You may obtain a copy of the License at
marcozecchini 0:9fca2b23d0ba 10 *
marcozecchini 0:9fca2b23d0ba 11 * http://www.apache.org/licenses/LICENSE-2.0
marcozecchini 0:9fca2b23d0ba 12 *
marcozecchini 0:9fca2b23d0ba 13 * Unless required by applicable law or agreed to in writing, software
marcozecchini 0:9fca2b23d0ba 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
marcozecchini 0:9fca2b23d0ba 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
marcozecchini 0:9fca2b23d0ba 16 * See the License for the specific language governing permissions and
marcozecchini 0:9fca2b23d0ba 17 * limitations under the License.
marcozecchini 0:9fca2b23d0ba 18 *
marcozecchini 0:9fca2b23d0ba 19 * This file is part of mbed TLS (https://tls.mbed.org)
marcozecchini 0:9fca2b23d0ba 20 */
marcozecchini 0:9fca2b23d0ba 21 /*
marcozecchini 0:9fca2b23d0ba 22 * References:
marcozecchini 0:9fca2b23d0ba 23 * - certificates: RFC 5280, updated by RFC 6818
marcozecchini 0:9fca2b23d0ba 24 * - CSRs: PKCS#10 v1.7 aka RFC 2986
marcozecchini 0:9fca2b23d0ba 25 * - attributes: PKCS#9 v2.0 aka RFC 2985
marcozecchini 0:9fca2b23d0ba 26 */
marcozecchini 0:9fca2b23d0ba 27
marcozecchini 0:9fca2b23d0ba 28 #if !defined(MBEDTLS_CONFIG_FILE)
marcozecchini 0:9fca2b23d0ba 29 #include "mbedtls/config.h"
marcozecchini 0:9fca2b23d0ba 30 #else
marcozecchini 0:9fca2b23d0ba 31 #include MBEDTLS_CONFIG_FILE
marcozecchini 0:9fca2b23d0ba 32 #endif
marcozecchini 0:9fca2b23d0ba 33
marcozecchini 0:9fca2b23d0ba 34 #if defined(MBEDTLS_X509_CRT_WRITE_C)
marcozecchini 0:9fca2b23d0ba 35
marcozecchini 0:9fca2b23d0ba 36 #include "mbedtls/x509_crt.h"
marcozecchini 0:9fca2b23d0ba 37 #include "mbedtls/oid.h"
marcozecchini 0:9fca2b23d0ba 38 #include "mbedtls/asn1write.h"
marcozecchini 0:9fca2b23d0ba 39 #include "mbedtls/sha1.h"
marcozecchini 0:9fca2b23d0ba 40
marcozecchini 0:9fca2b23d0ba 41 #include <string.h>
marcozecchini 0:9fca2b23d0ba 42
marcozecchini 0:9fca2b23d0ba 43 #if defined(MBEDTLS_PEM_WRITE_C)
marcozecchini 0:9fca2b23d0ba 44 #include "mbedtls/pem.h"
marcozecchini 0:9fca2b23d0ba 45 #endif /* MBEDTLS_PEM_WRITE_C */
marcozecchini 0:9fca2b23d0ba 46
marcozecchini 0:9fca2b23d0ba 47 /* Implementation that should never be optimized out by the compiler */
marcozecchini 0:9fca2b23d0ba 48 static void mbedtls_zeroize( void *v, size_t n ) {
marcozecchini 0:9fca2b23d0ba 49 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
marcozecchini 0:9fca2b23d0ba 50 }
marcozecchini 0:9fca2b23d0ba 51
marcozecchini 0:9fca2b23d0ba 52 void mbedtls_x509write_crt_init( mbedtls_x509write_cert *ctx )
marcozecchini 0:9fca2b23d0ba 53 {
marcozecchini 0:9fca2b23d0ba 54 memset( ctx, 0, sizeof(mbedtls_x509write_cert) );
marcozecchini 0:9fca2b23d0ba 55
marcozecchini 0:9fca2b23d0ba 56 mbedtls_mpi_init( &ctx->serial );
marcozecchini 0:9fca2b23d0ba 57 ctx->version = MBEDTLS_X509_CRT_VERSION_3;
marcozecchini 0:9fca2b23d0ba 58 }
marcozecchini 0:9fca2b23d0ba 59
marcozecchini 0:9fca2b23d0ba 60 void mbedtls_x509write_crt_free( mbedtls_x509write_cert *ctx )
marcozecchini 0:9fca2b23d0ba 61 {
marcozecchini 0:9fca2b23d0ba 62 mbedtls_mpi_free( &ctx->serial );
marcozecchini 0:9fca2b23d0ba 63
marcozecchini 0:9fca2b23d0ba 64 mbedtls_asn1_free_named_data_list( &ctx->subject );
marcozecchini 0:9fca2b23d0ba 65 mbedtls_asn1_free_named_data_list( &ctx->issuer );
marcozecchini 0:9fca2b23d0ba 66 mbedtls_asn1_free_named_data_list( &ctx->extensions );
marcozecchini 0:9fca2b23d0ba 67
marcozecchini 0:9fca2b23d0ba 68 mbedtls_zeroize( ctx, sizeof(mbedtls_x509write_cert) );
marcozecchini 0:9fca2b23d0ba 69 }
marcozecchini 0:9fca2b23d0ba 70
marcozecchini 0:9fca2b23d0ba 71 void mbedtls_x509write_crt_set_version( mbedtls_x509write_cert *ctx, int version )
marcozecchini 0:9fca2b23d0ba 72 {
marcozecchini 0:9fca2b23d0ba 73 ctx->version = version;
marcozecchini 0:9fca2b23d0ba 74 }
marcozecchini 0:9fca2b23d0ba 75
marcozecchini 0:9fca2b23d0ba 76 void mbedtls_x509write_crt_set_md_alg( mbedtls_x509write_cert *ctx, mbedtls_md_type_t md_alg )
marcozecchini 0:9fca2b23d0ba 77 {
marcozecchini 0:9fca2b23d0ba 78 ctx->md_alg = md_alg;
marcozecchini 0:9fca2b23d0ba 79 }
marcozecchini 0:9fca2b23d0ba 80
marcozecchini 0:9fca2b23d0ba 81 void mbedtls_x509write_crt_set_subject_key( mbedtls_x509write_cert *ctx, mbedtls_pk_context *key )
marcozecchini 0:9fca2b23d0ba 82 {
marcozecchini 0:9fca2b23d0ba 83 ctx->subject_key = key;
marcozecchini 0:9fca2b23d0ba 84 }
marcozecchini 0:9fca2b23d0ba 85
marcozecchini 0:9fca2b23d0ba 86 void mbedtls_x509write_crt_set_issuer_key( mbedtls_x509write_cert *ctx, mbedtls_pk_context *key )
marcozecchini 0:9fca2b23d0ba 87 {
marcozecchini 0:9fca2b23d0ba 88 ctx->issuer_key = key;
marcozecchini 0:9fca2b23d0ba 89 }
marcozecchini 0:9fca2b23d0ba 90
marcozecchini 0:9fca2b23d0ba 91 int mbedtls_x509write_crt_set_subject_name( mbedtls_x509write_cert *ctx,
marcozecchini 0:9fca2b23d0ba 92 const char *subject_name )
marcozecchini 0:9fca2b23d0ba 93 {
marcozecchini 0:9fca2b23d0ba 94 return mbedtls_x509_string_to_names( &ctx->subject, subject_name );
marcozecchini 0:9fca2b23d0ba 95 }
marcozecchini 0:9fca2b23d0ba 96
marcozecchini 0:9fca2b23d0ba 97 int mbedtls_x509write_crt_set_issuer_name( mbedtls_x509write_cert *ctx,
marcozecchini 0:9fca2b23d0ba 98 const char *issuer_name )
marcozecchini 0:9fca2b23d0ba 99 {
marcozecchini 0:9fca2b23d0ba 100 return mbedtls_x509_string_to_names( &ctx->issuer, issuer_name );
marcozecchini 0:9fca2b23d0ba 101 }
marcozecchini 0:9fca2b23d0ba 102
marcozecchini 0:9fca2b23d0ba 103 int mbedtls_x509write_crt_set_serial( mbedtls_x509write_cert *ctx, const mbedtls_mpi *serial )
marcozecchini 0:9fca2b23d0ba 104 {
marcozecchini 0:9fca2b23d0ba 105 int ret;
marcozecchini 0:9fca2b23d0ba 106
marcozecchini 0:9fca2b23d0ba 107 if( ( ret = mbedtls_mpi_copy( &ctx->serial, serial ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 108 return( ret );
marcozecchini 0:9fca2b23d0ba 109
marcozecchini 0:9fca2b23d0ba 110 return( 0 );
marcozecchini 0:9fca2b23d0ba 111 }
marcozecchini 0:9fca2b23d0ba 112
marcozecchini 0:9fca2b23d0ba 113 int mbedtls_x509write_crt_set_validity( mbedtls_x509write_cert *ctx, const char *not_before,
marcozecchini 0:9fca2b23d0ba 114 const char *not_after )
marcozecchini 0:9fca2b23d0ba 115 {
marcozecchini 0:9fca2b23d0ba 116 if( strlen( not_before ) != MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1 ||
marcozecchini 0:9fca2b23d0ba 117 strlen( not_after ) != MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1 )
marcozecchini 0:9fca2b23d0ba 118 {
marcozecchini 0:9fca2b23d0ba 119 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
marcozecchini 0:9fca2b23d0ba 120 }
marcozecchini 0:9fca2b23d0ba 121 strncpy( ctx->not_before, not_before, MBEDTLS_X509_RFC5280_UTC_TIME_LEN );
marcozecchini 0:9fca2b23d0ba 122 strncpy( ctx->not_after , not_after , MBEDTLS_X509_RFC5280_UTC_TIME_LEN );
marcozecchini 0:9fca2b23d0ba 123 ctx->not_before[MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1] = 'Z';
marcozecchini 0:9fca2b23d0ba 124 ctx->not_after[MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1] = 'Z';
marcozecchini 0:9fca2b23d0ba 125
marcozecchini 0:9fca2b23d0ba 126 return( 0 );
marcozecchini 0:9fca2b23d0ba 127 }
marcozecchini 0:9fca2b23d0ba 128
marcozecchini 0:9fca2b23d0ba 129 int mbedtls_x509write_crt_set_extension( mbedtls_x509write_cert *ctx,
marcozecchini 0:9fca2b23d0ba 130 const char *oid, size_t oid_len,
marcozecchini 0:9fca2b23d0ba 131 int critical,
marcozecchini 0:9fca2b23d0ba 132 const unsigned char *val, size_t val_len )
marcozecchini 0:9fca2b23d0ba 133 {
marcozecchini 0:9fca2b23d0ba 134 return mbedtls_x509_set_extension( &ctx->extensions, oid, oid_len,
marcozecchini 0:9fca2b23d0ba 135 critical, val, val_len );
marcozecchini 0:9fca2b23d0ba 136 }
marcozecchini 0:9fca2b23d0ba 137
marcozecchini 0:9fca2b23d0ba 138 int mbedtls_x509write_crt_set_basic_constraints( mbedtls_x509write_cert *ctx,
marcozecchini 0:9fca2b23d0ba 139 int is_ca, int max_pathlen )
marcozecchini 0:9fca2b23d0ba 140 {
marcozecchini 0:9fca2b23d0ba 141 int ret;
marcozecchini 0:9fca2b23d0ba 142 unsigned char buf[9];
marcozecchini 0:9fca2b23d0ba 143 unsigned char *c = buf + sizeof(buf);
marcozecchini 0:9fca2b23d0ba 144 size_t len = 0;
marcozecchini 0:9fca2b23d0ba 145
marcozecchini 0:9fca2b23d0ba 146 memset( buf, 0, sizeof(buf) );
marcozecchini 0:9fca2b23d0ba 147
marcozecchini 0:9fca2b23d0ba 148 if( is_ca && max_pathlen > 127 )
marcozecchini 0:9fca2b23d0ba 149 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
marcozecchini 0:9fca2b23d0ba 150
marcozecchini 0:9fca2b23d0ba 151 if( is_ca )
marcozecchini 0:9fca2b23d0ba 152 {
marcozecchini 0:9fca2b23d0ba 153 if( max_pathlen >= 0 )
marcozecchini 0:9fca2b23d0ba 154 {
marcozecchini 0:9fca2b23d0ba 155 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, buf, max_pathlen ) );
marcozecchini 0:9fca2b23d0ba 156 }
marcozecchini 0:9fca2b23d0ba 157 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_bool( &c, buf, 1 ) );
marcozecchini 0:9fca2b23d0ba 158 }
marcozecchini 0:9fca2b23d0ba 159
marcozecchini 0:9fca2b23d0ba 160 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
marcozecchini 0:9fca2b23d0ba 161 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
marcozecchini 0:9fca2b23d0ba 162 MBEDTLS_ASN1_SEQUENCE ) );
marcozecchini 0:9fca2b23d0ba 163
marcozecchini 0:9fca2b23d0ba 164 return mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_BASIC_CONSTRAINTS,
marcozecchini 0:9fca2b23d0ba 165 MBEDTLS_OID_SIZE( MBEDTLS_OID_BASIC_CONSTRAINTS ),
marcozecchini 0:9fca2b23d0ba 166 0, buf + sizeof(buf) - len, len );
marcozecchini 0:9fca2b23d0ba 167 }
marcozecchini 0:9fca2b23d0ba 168
marcozecchini 0:9fca2b23d0ba 169 #if defined(MBEDTLS_SHA1_C)
marcozecchini 0:9fca2b23d0ba 170 int mbedtls_x509write_crt_set_subject_key_identifier( mbedtls_x509write_cert *ctx )
marcozecchini 0:9fca2b23d0ba 171 {
marcozecchini 0:9fca2b23d0ba 172 int ret;
marcozecchini 0:9fca2b23d0ba 173 unsigned char buf[MBEDTLS_MPI_MAX_SIZE * 2 + 20]; /* tag, length + 2xMPI */
marcozecchini 0:9fca2b23d0ba 174 unsigned char *c = buf + sizeof(buf);
marcozecchini 0:9fca2b23d0ba 175 size_t len = 0;
marcozecchini 0:9fca2b23d0ba 176
marcozecchini 0:9fca2b23d0ba 177 memset( buf, 0, sizeof(buf) );
marcozecchini 0:9fca2b23d0ba 178 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, ctx->subject_key ) );
marcozecchini 0:9fca2b23d0ba 179
marcozecchini 0:9fca2b23d0ba 180 mbedtls_sha1( buf + sizeof(buf) - len, len, buf + sizeof(buf) - 20 );
marcozecchini 0:9fca2b23d0ba 181 c = buf + sizeof(buf) - 20;
marcozecchini 0:9fca2b23d0ba 182 len = 20;
marcozecchini 0:9fca2b23d0ba 183
marcozecchini 0:9fca2b23d0ba 184 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
marcozecchini 0:9fca2b23d0ba 185 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_OCTET_STRING ) );
marcozecchini 0:9fca2b23d0ba 186
marcozecchini 0:9fca2b23d0ba 187 return mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_SUBJECT_KEY_IDENTIFIER,
marcozecchini 0:9fca2b23d0ba 188 MBEDTLS_OID_SIZE( MBEDTLS_OID_SUBJECT_KEY_IDENTIFIER ),
marcozecchini 0:9fca2b23d0ba 189 0, buf + sizeof(buf) - len, len );
marcozecchini 0:9fca2b23d0ba 190 }
marcozecchini 0:9fca2b23d0ba 191
marcozecchini 0:9fca2b23d0ba 192 int mbedtls_x509write_crt_set_authority_key_identifier( mbedtls_x509write_cert *ctx )
marcozecchini 0:9fca2b23d0ba 193 {
marcozecchini 0:9fca2b23d0ba 194 int ret;
marcozecchini 0:9fca2b23d0ba 195 unsigned char buf[MBEDTLS_MPI_MAX_SIZE * 2 + 20]; /* tag, length + 2xMPI */
marcozecchini 0:9fca2b23d0ba 196 unsigned char *c = buf + sizeof(buf);
marcozecchini 0:9fca2b23d0ba 197 size_t len = 0;
marcozecchini 0:9fca2b23d0ba 198
marcozecchini 0:9fca2b23d0ba 199 memset( buf, 0, sizeof(buf) );
marcozecchini 0:9fca2b23d0ba 200 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_pk_write_pubkey( &c, buf, ctx->issuer_key ) );
marcozecchini 0:9fca2b23d0ba 201
marcozecchini 0:9fca2b23d0ba 202 mbedtls_sha1( buf + sizeof(buf) - len, len, buf + sizeof(buf) - 20 );
marcozecchini 0:9fca2b23d0ba 203 c = buf + sizeof(buf) - 20;
marcozecchini 0:9fca2b23d0ba 204 len = 20;
marcozecchini 0:9fca2b23d0ba 205
marcozecchini 0:9fca2b23d0ba 206 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
marcozecchini 0:9fca2b23d0ba 207 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONTEXT_SPECIFIC | 0 ) );
marcozecchini 0:9fca2b23d0ba 208
marcozecchini 0:9fca2b23d0ba 209 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, buf, len ) );
marcozecchini 0:9fca2b23d0ba 210 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, buf, MBEDTLS_ASN1_CONSTRUCTED |
marcozecchini 0:9fca2b23d0ba 211 MBEDTLS_ASN1_SEQUENCE ) );
marcozecchini 0:9fca2b23d0ba 212
marcozecchini 0:9fca2b23d0ba 213 return mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_AUTHORITY_KEY_IDENTIFIER,
marcozecchini 0:9fca2b23d0ba 214 MBEDTLS_OID_SIZE( MBEDTLS_OID_AUTHORITY_KEY_IDENTIFIER ),
marcozecchini 0:9fca2b23d0ba 215 0, buf + sizeof(buf) - len, len );
marcozecchini 0:9fca2b23d0ba 216 }
marcozecchini 0:9fca2b23d0ba 217 #endif /* MBEDTLS_SHA1_C */
marcozecchini 0:9fca2b23d0ba 218
marcozecchini 0:9fca2b23d0ba 219 int mbedtls_x509write_crt_set_key_usage( mbedtls_x509write_cert *ctx,
marcozecchini 0:9fca2b23d0ba 220 unsigned int key_usage )
marcozecchini 0:9fca2b23d0ba 221 {
marcozecchini 0:9fca2b23d0ba 222 unsigned char buf[4], ku;
marcozecchini 0:9fca2b23d0ba 223 unsigned char *c;
marcozecchini 0:9fca2b23d0ba 224 int ret;
marcozecchini 0:9fca2b23d0ba 225
marcozecchini 0:9fca2b23d0ba 226 /* We currently only support 7 bits, from 0x80 to 0x02 */
marcozecchini 0:9fca2b23d0ba 227 if( ( key_usage & ~0xfe ) != 0 )
marcozecchini 0:9fca2b23d0ba 228 return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
marcozecchini 0:9fca2b23d0ba 229
marcozecchini 0:9fca2b23d0ba 230 c = buf + 4;
marcozecchini 0:9fca2b23d0ba 231 ku = (unsigned char) key_usage;
marcozecchini 0:9fca2b23d0ba 232
marcozecchini 0:9fca2b23d0ba 233 if( ( ret = mbedtls_asn1_write_bitstring( &c, buf, &ku, 7 ) ) != 4 )
marcozecchini 0:9fca2b23d0ba 234 return( ret );
marcozecchini 0:9fca2b23d0ba 235
marcozecchini 0:9fca2b23d0ba 236 ret = mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_KEY_USAGE,
marcozecchini 0:9fca2b23d0ba 237 MBEDTLS_OID_SIZE( MBEDTLS_OID_KEY_USAGE ),
marcozecchini 0:9fca2b23d0ba 238 1, buf, 4 );
marcozecchini 0:9fca2b23d0ba 239 if( ret != 0 )
marcozecchini 0:9fca2b23d0ba 240 return( ret );
marcozecchini 0:9fca2b23d0ba 241
marcozecchini 0:9fca2b23d0ba 242 return( 0 );
marcozecchini 0:9fca2b23d0ba 243 }
marcozecchini 0:9fca2b23d0ba 244
marcozecchini 0:9fca2b23d0ba 245 int mbedtls_x509write_crt_set_ns_cert_type( mbedtls_x509write_cert *ctx,
marcozecchini 0:9fca2b23d0ba 246 unsigned char ns_cert_type )
marcozecchini 0:9fca2b23d0ba 247 {
marcozecchini 0:9fca2b23d0ba 248 unsigned char buf[4];
marcozecchini 0:9fca2b23d0ba 249 unsigned char *c;
marcozecchini 0:9fca2b23d0ba 250 int ret;
marcozecchini 0:9fca2b23d0ba 251
marcozecchini 0:9fca2b23d0ba 252 c = buf + 4;
marcozecchini 0:9fca2b23d0ba 253
marcozecchini 0:9fca2b23d0ba 254 if( ( ret = mbedtls_asn1_write_bitstring( &c, buf, &ns_cert_type, 8 ) ) != 4 )
marcozecchini 0:9fca2b23d0ba 255 return( ret );
marcozecchini 0:9fca2b23d0ba 256
marcozecchini 0:9fca2b23d0ba 257 ret = mbedtls_x509write_crt_set_extension( ctx, MBEDTLS_OID_NS_CERT_TYPE,
marcozecchini 0:9fca2b23d0ba 258 MBEDTLS_OID_SIZE( MBEDTLS_OID_NS_CERT_TYPE ),
marcozecchini 0:9fca2b23d0ba 259 0, buf, 4 );
marcozecchini 0:9fca2b23d0ba 260 if( ret != 0 )
marcozecchini 0:9fca2b23d0ba 261 return( ret );
marcozecchini 0:9fca2b23d0ba 262
marcozecchini 0:9fca2b23d0ba 263 return( 0 );
marcozecchini 0:9fca2b23d0ba 264 }
marcozecchini 0:9fca2b23d0ba 265
marcozecchini 0:9fca2b23d0ba 266 static int x509_write_time( unsigned char **p, unsigned char *start,
marcozecchini 0:9fca2b23d0ba 267 const char *t, size_t size )
marcozecchini 0:9fca2b23d0ba 268 {
marcozecchini 0:9fca2b23d0ba 269 int ret;
marcozecchini 0:9fca2b23d0ba 270 size_t len = 0;
marcozecchini 0:9fca2b23d0ba 271
marcozecchini 0:9fca2b23d0ba 272 /*
marcozecchini 0:9fca2b23d0ba 273 * write MBEDTLS_ASN1_UTC_TIME if year < 2050 (2 bytes shorter)
marcozecchini 0:9fca2b23d0ba 274 */
marcozecchini 0:9fca2b23d0ba 275 if( t[0] == '2' && t[1] == '0' && t[2] < '5' )
marcozecchini 0:9fca2b23d0ba 276 {
marcozecchini 0:9fca2b23d0ba 277 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start,
marcozecchini 0:9fca2b23d0ba 278 (const unsigned char *) t + 2,
marcozecchini 0:9fca2b23d0ba 279 size - 2 ) );
marcozecchini 0:9fca2b23d0ba 280 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
marcozecchini 0:9fca2b23d0ba 281 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_UTC_TIME ) );
marcozecchini 0:9fca2b23d0ba 282 }
marcozecchini 0:9fca2b23d0ba 283 else
marcozecchini 0:9fca2b23d0ba 284 {
marcozecchini 0:9fca2b23d0ba 285 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start,
marcozecchini 0:9fca2b23d0ba 286 (const unsigned char *) t,
marcozecchini 0:9fca2b23d0ba 287 size ) );
marcozecchini 0:9fca2b23d0ba 288 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
marcozecchini 0:9fca2b23d0ba 289 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_GENERALIZED_TIME ) );
marcozecchini 0:9fca2b23d0ba 290 }
marcozecchini 0:9fca2b23d0ba 291
marcozecchini 0:9fca2b23d0ba 292 return( (int) len );
marcozecchini 0:9fca2b23d0ba 293 }
marcozecchini 0:9fca2b23d0ba 294
marcozecchini 0:9fca2b23d0ba 295 int mbedtls_x509write_crt_der( mbedtls_x509write_cert *ctx, unsigned char *buf, size_t size,
marcozecchini 0:9fca2b23d0ba 296 int (*f_rng)(void *, unsigned char *, size_t),
marcozecchini 0:9fca2b23d0ba 297 void *p_rng )
marcozecchini 0:9fca2b23d0ba 298 {
marcozecchini 0:9fca2b23d0ba 299 int ret;
marcozecchini 0:9fca2b23d0ba 300 const char *sig_oid;
marcozecchini 0:9fca2b23d0ba 301 size_t sig_oid_len = 0;
marcozecchini 0:9fca2b23d0ba 302 unsigned char *c, *c2;
marcozecchini 0:9fca2b23d0ba 303 unsigned char hash[64];
marcozecchini 0:9fca2b23d0ba 304 unsigned char sig[MBEDTLS_MPI_MAX_SIZE];
marcozecchini 0:9fca2b23d0ba 305 unsigned char tmp_buf[2048];
marcozecchini 0:9fca2b23d0ba 306 size_t sub_len = 0, pub_len = 0, sig_and_oid_len = 0, sig_len;
marcozecchini 0:9fca2b23d0ba 307 size_t len = 0;
marcozecchini 0:9fca2b23d0ba 308 mbedtls_pk_type_t pk_alg;
marcozecchini 0:9fca2b23d0ba 309
marcozecchini 0:9fca2b23d0ba 310 /*
marcozecchini 0:9fca2b23d0ba 311 * Prepare data to be signed in tmp_buf
marcozecchini 0:9fca2b23d0ba 312 */
marcozecchini 0:9fca2b23d0ba 313 c = tmp_buf + sizeof( tmp_buf );
marcozecchini 0:9fca2b23d0ba 314
marcozecchini 0:9fca2b23d0ba 315 /* Signature algorithm needed in TBS, and later for actual signature */
marcozecchini 0:9fca2b23d0ba 316 pk_alg = mbedtls_pk_get_type( ctx->issuer_key );
marcozecchini 0:9fca2b23d0ba 317 if( pk_alg == MBEDTLS_PK_ECKEY )
marcozecchini 0:9fca2b23d0ba 318 pk_alg = MBEDTLS_PK_ECDSA;
marcozecchini 0:9fca2b23d0ba 319
marcozecchini 0:9fca2b23d0ba 320 if( ( ret = mbedtls_oid_get_oid_by_sig_alg( pk_alg, ctx->md_alg,
marcozecchini 0:9fca2b23d0ba 321 &sig_oid, &sig_oid_len ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 322 {
marcozecchini 0:9fca2b23d0ba 323 return( ret );
marcozecchini 0:9fca2b23d0ba 324 }
marcozecchini 0:9fca2b23d0ba 325
marcozecchini 0:9fca2b23d0ba 326 /*
marcozecchini 0:9fca2b23d0ba 327 * Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension
marcozecchini 0:9fca2b23d0ba 328 */
marcozecchini 0:9fca2b23d0ba 329 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_extensions( &c, tmp_buf, ctx->extensions ) );
marcozecchini 0:9fca2b23d0ba 330 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
marcozecchini 0:9fca2b23d0ba 331 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
marcozecchini 0:9fca2b23d0ba 332 MBEDTLS_ASN1_SEQUENCE ) );
marcozecchini 0:9fca2b23d0ba 333 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
marcozecchini 0:9fca2b23d0ba 334 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONTEXT_SPECIFIC |
marcozecchini 0:9fca2b23d0ba 335 MBEDTLS_ASN1_CONSTRUCTED | 3 ) );
marcozecchini 0:9fca2b23d0ba 336
marcozecchini 0:9fca2b23d0ba 337 /*
marcozecchini 0:9fca2b23d0ba 338 * SubjectPublicKeyInfo
marcozecchini 0:9fca2b23d0ba 339 */
marcozecchini 0:9fca2b23d0ba 340 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_pk_write_pubkey_der( ctx->subject_key,
marcozecchini 0:9fca2b23d0ba 341 tmp_buf, c - tmp_buf ) );
marcozecchini 0:9fca2b23d0ba 342 c -= pub_len;
marcozecchini 0:9fca2b23d0ba 343 len += pub_len;
marcozecchini 0:9fca2b23d0ba 344
marcozecchini 0:9fca2b23d0ba 345 /*
marcozecchini 0:9fca2b23d0ba 346 * Subject ::= Name
marcozecchini 0:9fca2b23d0ba 347 */
marcozecchini 0:9fca2b23d0ba 348 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_names( &c, tmp_buf, ctx->subject ) );
marcozecchini 0:9fca2b23d0ba 349
marcozecchini 0:9fca2b23d0ba 350 /*
marcozecchini 0:9fca2b23d0ba 351 * Validity ::= SEQUENCE {
marcozecchini 0:9fca2b23d0ba 352 * notBefore Time,
marcozecchini 0:9fca2b23d0ba 353 * notAfter Time }
marcozecchini 0:9fca2b23d0ba 354 */
marcozecchini 0:9fca2b23d0ba 355 sub_len = 0;
marcozecchini 0:9fca2b23d0ba 356
marcozecchini 0:9fca2b23d0ba 357 MBEDTLS_ASN1_CHK_ADD( sub_len, x509_write_time( &c, tmp_buf, ctx->not_after,
marcozecchini 0:9fca2b23d0ba 358 MBEDTLS_X509_RFC5280_UTC_TIME_LEN ) );
marcozecchini 0:9fca2b23d0ba 359
marcozecchini 0:9fca2b23d0ba 360 MBEDTLS_ASN1_CHK_ADD( sub_len, x509_write_time( &c, tmp_buf, ctx->not_before,
marcozecchini 0:9fca2b23d0ba 361 MBEDTLS_X509_RFC5280_UTC_TIME_LEN ) );
marcozecchini 0:9fca2b23d0ba 362
marcozecchini 0:9fca2b23d0ba 363 len += sub_len;
marcozecchini 0:9fca2b23d0ba 364 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, sub_len ) );
marcozecchini 0:9fca2b23d0ba 365 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
marcozecchini 0:9fca2b23d0ba 366 MBEDTLS_ASN1_SEQUENCE ) );
marcozecchini 0:9fca2b23d0ba 367
marcozecchini 0:9fca2b23d0ba 368 /*
marcozecchini 0:9fca2b23d0ba 369 * Issuer ::= Name
marcozecchini 0:9fca2b23d0ba 370 */
marcozecchini 0:9fca2b23d0ba 371 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_names( &c, tmp_buf, ctx->issuer ) );
marcozecchini 0:9fca2b23d0ba 372
marcozecchini 0:9fca2b23d0ba 373 /*
marcozecchini 0:9fca2b23d0ba 374 * Signature ::= AlgorithmIdentifier
marcozecchini 0:9fca2b23d0ba 375 */
marcozecchini 0:9fca2b23d0ba 376 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier( &c, tmp_buf,
marcozecchini 0:9fca2b23d0ba 377 sig_oid, strlen( sig_oid ), 0 ) );
marcozecchini 0:9fca2b23d0ba 378
marcozecchini 0:9fca2b23d0ba 379 /*
marcozecchini 0:9fca2b23d0ba 380 * Serial ::= INTEGER
marcozecchini 0:9fca2b23d0ba 381 */
marcozecchini 0:9fca2b23d0ba 382 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_mpi( &c, tmp_buf, &ctx->serial ) );
marcozecchini 0:9fca2b23d0ba 383
marcozecchini 0:9fca2b23d0ba 384 /*
marcozecchini 0:9fca2b23d0ba 385 * Version ::= INTEGER { v1(0), v2(1), v3(2) }
marcozecchini 0:9fca2b23d0ba 386 */
marcozecchini 0:9fca2b23d0ba 387 sub_len = 0;
marcozecchini 0:9fca2b23d0ba 388 MBEDTLS_ASN1_CHK_ADD( sub_len, mbedtls_asn1_write_int( &c, tmp_buf, ctx->version ) );
marcozecchini 0:9fca2b23d0ba 389 len += sub_len;
marcozecchini 0:9fca2b23d0ba 390 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, sub_len ) );
marcozecchini 0:9fca2b23d0ba 391 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONTEXT_SPECIFIC |
marcozecchini 0:9fca2b23d0ba 392 MBEDTLS_ASN1_CONSTRUCTED | 0 ) );
marcozecchini 0:9fca2b23d0ba 393
marcozecchini 0:9fca2b23d0ba 394 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
marcozecchini 0:9fca2b23d0ba 395 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
marcozecchini 0:9fca2b23d0ba 396 MBEDTLS_ASN1_SEQUENCE ) );
marcozecchini 0:9fca2b23d0ba 397
marcozecchini 0:9fca2b23d0ba 398 /*
marcozecchini 0:9fca2b23d0ba 399 * Make signature
marcozecchini 0:9fca2b23d0ba 400 */
marcozecchini 0:9fca2b23d0ba 401 mbedtls_md( mbedtls_md_info_from_type( ctx->md_alg ), c, len, hash );
marcozecchini 0:9fca2b23d0ba 402
marcozecchini 0:9fca2b23d0ba 403 if( ( ret = mbedtls_pk_sign( ctx->issuer_key, ctx->md_alg, hash, 0, sig, &sig_len,
marcozecchini 0:9fca2b23d0ba 404 f_rng, p_rng ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 405 {
marcozecchini 0:9fca2b23d0ba 406 return( ret );
marcozecchini 0:9fca2b23d0ba 407 }
marcozecchini 0:9fca2b23d0ba 408
marcozecchini 0:9fca2b23d0ba 409 /*
marcozecchini 0:9fca2b23d0ba 410 * Write data to output buffer
marcozecchini 0:9fca2b23d0ba 411 */
marcozecchini 0:9fca2b23d0ba 412 c2 = buf + size;
marcozecchini 0:9fca2b23d0ba 413 MBEDTLS_ASN1_CHK_ADD( sig_and_oid_len, mbedtls_x509_write_sig( &c2, buf,
marcozecchini 0:9fca2b23d0ba 414 sig_oid, sig_oid_len, sig, sig_len ) );
marcozecchini 0:9fca2b23d0ba 415
marcozecchini 0:9fca2b23d0ba 416 if( len > (size_t)( c2 - buf ) )
marcozecchini 0:9fca2b23d0ba 417 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
marcozecchini 0:9fca2b23d0ba 418
marcozecchini 0:9fca2b23d0ba 419 c2 -= len;
marcozecchini 0:9fca2b23d0ba 420 memcpy( c2, c, len );
marcozecchini 0:9fca2b23d0ba 421
marcozecchini 0:9fca2b23d0ba 422 len += sig_and_oid_len;
marcozecchini 0:9fca2b23d0ba 423 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c2, buf, len ) );
marcozecchini 0:9fca2b23d0ba 424 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c2, buf, MBEDTLS_ASN1_CONSTRUCTED |
marcozecchini 0:9fca2b23d0ba 425 MBEDTLS_ASN1_SEQUENCE ) );
marcozecchini 0:9fca2b23d0ba 426
marcozecchini 0:9fca2b23d0ba 427 return( (int) len );
marcozecchini 0:9fca2b23d0ba 428 }
marcozecchini 0:9fca2b23d0ba 429
marcozecchini 0:9fca2b23d0ba 430 #define PEM_BEGIN_CRT "-----BEGIN CERTIFICATE-----\n"
marcozecchini 0:9fca2b23d0ba 431 #define PEM_END_CRT "-----END CERTIFICATE-----\n"
marcozecchini 0:9fca2b23d0ba 432
marcozecchini 0:9fca2b23d0ba 433 #if defined(MBEDTLS_PEM_WRITE_C)
marcozecchini 0:9fca2b23d0ba 434 int mbedtls_x509write_crt_pem( mbedtls_x509write_cert *crt, unsigned char *buf, size_t size,
marcozecchini 0:9fca2b23d0ba 435 int (*f_rng)(void *, unsigned char *, size_t),
marcozecchini 0:9fca2b23d0ba 436 void *p_rng )
marcozecchini 0:9fca2b23d0ba 437 {
marcozecchini 0:9fca2b23d0ba 438 int ret;
marcozecchini 0:9fca2b23d0ba 439 unsigned char output_buf[4096];
marcozecchini 0:9fca2b23d0ba 440 size_t olen = 0;
marcozecchini 0:9fca2b23d0ba 441
marcozecchini 0:9fca2b23d0ba 442 if( ( ret = mbedtls_x509write_crt_der( crt, output_buf, sizeof(output_buf),
marcozecchini 0:9fca2b23d0ba 443 f_rng, p_rng ) ) < 0 )
marcozecchini 0:9fca2b23d0ba 444 {
marcozecchini 0:9fca2b23d0ba 445 return( ret );
marcozecchini 0:9fca2b23d0ba 446 }
marcozecchini 0:9fca2b23d0ba 447
marcozecchini 0:9fca2b23d0ba 448 if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_CRT, PEM_END_CRT,
marcozecchini 0:9fca2b23d0ba 449 output_buf + sizeof(output_buf) - ret,
marcozecchini 0:9fca2b23d0ba 450 ret, buf, size, &olen ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 451 {
marcozecchini 0:9fca2b23d0ba 452 return( ret );
marcozecchini 0:9fca2b23d0ba 453 }
marcozecchini 0:9fca2b23d0ba 454
marcozecchini 0:9fca2b23d0ba 455 return( 0 );
marcozecchini 0:9fca2b23d0ba 456 }
marcozecchini 0:9fca2b23d0ba 457 #endif /* MBEDTLS_PEM_WRITE_C */
marcozecchini 0:9fca2b23d0ba 458
marcozecchini 0:9fca2b23d0ba 459 #endif /* MBEDTLS_X509_CRT_WRITE_C */