EL4121 Embedded System / mbed-os

mbed-os

Dependents:   cobaLCDJoyMotor_Thread odometry_omni_3roda_v3 odometry_omni_3roda_v1 odometry_omni_3roda_v2 ... more

features/mbedtls/src/x509write_csr.c@0:b74591d5ab33, 2017-12-11 (annotated)

Committer:
be_bryan
Date:
Mon Dec 11 17:54:04 2017 +0000
Revision:
0:b74591d5ab33
motor ++

Who changed what in which revision?

UserRevisionLine numberNew contents of line
be_bryan 0:b74591d5ab33 1 /*
be_bryan 0:b74591d5ab33 2 * X.509 Certificate Signing Request writing
be_bryan 0:b74591d5ab33 3 *
be_bryan 0:b74591d5ab33 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
be_bryan 0:b74591d5ab33 5 * SPDX-License-Identifier: Apache-2.0
be_bryan 0:b74591d5ab33 6 *
be_bryan 0:b74591d5ab33 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
be_bryan 0:b74591d5ab33 8 * not use this file except in compliance with the License.
be_bryan 0:b74591d5ab33 9 * You may obtain a copy of the License at
be_bryan 0:b74591d5ab33 10 *
be_bryan 0:b74591d5ab33 11 * http://www.apache.org/licenses/LICENSE-2.0
be_bryan 0:b74591d5ab33 12 *
be_bryan 0:b74591d5ab33 13 * Unless required by applicable law or agreed to in writing, software
be_bryan 0:b74591d5ab33 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
be_bryan 0:b74591d5ab33 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
be_bryan 0:b74591d5ab33 16 * See the License for the specific language governing permissions and
be_bryan 0:b74591d5ab33 17 * limitations under the License.
be_bryan 0:b74591d5ab33 18 *
be_bryan 0:b74591d5ab33 19 * This file is part of mbed TLS (https://tls.mbed.org)
be_bryan 0:b74591d5ab33 20 */
be_bryan 0:b74591d5ab33 21 /*
be_bryan 0:b74591d5ab33 22 * References:
be_bryan 0:b74591d5ab33 23 * - CSRs: PKCS#10 v1.7 aka RFC 2986
be_bryan 0:b74591d5ab33 24 * - attributes: PKCS#9 v2.0 aka RFC 2985
be_bryan 0:b74591d5ab33 25 */
be_bryan 0:b74591d5ab33 26
be_bryan 0:b74591d5ab33 27 #if !defined(MBEDTLS_CONFIG_FILE)
be_bryan 0:b74591d5ab33 28 #include "mbedtls/config.h"
be_bryan 0:b74591d5ab33 29 #else
be_bryan 0:b74591d5ab33 30 #include MBEDTLS_CONFIG_FILE
be_bryan 0:b74591d5ab33 31 #endif
be_bryan 0:b74591d5ab33 32
be_bryan 0:b74591d5ab33 33 #if defined(MBEDTLS_X509_CSR_WRITE_C)
be_bryan 0:b74591d5ab33 34
be_bryan 0:b74591d5ab33 35 #include "mbedtls/x509_csr.h"
be_bryan 0:b74591d5ab33 36 #include "mbedtls/oid.h"
be_bryan 0:b74591d5ab33 37 #include "mbedtls/asn1write.h"
be_bryan 0:b74591d5ab33 38
be_bryan 0:b74591d5ab33 39 #include <string.h>
be_bryan 0:b74591d5ab33 40 #include <stdlib.h>
be_bryan 0:b74591d5ab33 41
be_bryan 0:b74591d5ab33 42 #if defined(MBEDTLS_PEM_WRITE_C)
be_bryan 0:b74591d5ab33 43 #include "mbedtls/pem.h"
be_bryan 0:b74591d5ab33 44 #endif
be_bryan 0:b74591d5ab33 45
be_bryan 0:b74591d5ab33 46 /* Implementation that should never be optimized out by the compiler */
be_bryan 0:b74591d5ab33 47 static void mbedtls_zeroize( void *v, size_t n ) {
be_bryan 0:b74591d5ab33 48 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
be_bryan 0:b74591d5ab33 49 }
be_bryan 0:b74591d5ab33 50
be_bryan 0:b74591d5ab33 51 void mbedtls_x509write_csr_init( mbedtls_x509write_csr *ctx )
be_bryan 0:b74591d5ab33 52 {
be_bryan 0:b74591d5ab33 53 memset( ctx, 0, sizeof(mbedtls_x509write_csr) );
be_bryan 0:b74591d5ab33 54 }
be_bryan 0:b74591d5ab33 55
be_bryan 0:b74591d5ab33 56 void mbedtls_x509write_csr_free( mbedtls_x509write_csr *ctx )
be_bryan 0:b74591d5ab33 57 {
be_bryan 0:b74591d5ab33 58 mbedtls_asn1_free_named_data_list( &ctx->subject );
be_bryan 0:b74591d5ab33 59 mbedtls_asn1_free_named_data_list( &ctx->extensions );
be_bryan 0:b74591d5ab33 60
be_bryan 0:b74591d5ab33 61 mbedtls_zeroize( ctx, sizeof(mbedtls_x509write_csr) );
be_bryan 0:b74591d5ab33 62 }
be_bryan 0:b74591d5ab33 63
be_bryan 0:b74591d5ab33 64 void mbedtls_x509write_csr_set_md_alg( mbedtls_x509write_csr *ctx, mbedtls_md_type_t md_alg )
be_bryan 0:b74591d5ab33 65 {
be_bryan 0:b74591d5ab33 66 ctx->md_alg = md_alg;
be_bryan 0:b74591d5ab33 67 }
be_bryan 0:b74591d5ab33 68
be_bryan 0:b74591d5ab33 69 void mbedtls_x509write_csr_set_key( mbedtls_x509write_csr *ctx, mbedtls_pk_context *key )
be_bryan 0:b74591d5ab33 70 {
be_bryan 0:b74591d5ab33 71 ctx->key = key;
be_bryan 0:b74591d5ab33 72 }
be_bryan 0:b74591d5ab33 73
be_bryan 0:b74591d5ab33 74 int mbedtls_x509write_csr_set_subject_name( mbedtls_x509write_csr *ctx,
be_bryan 0:b74591d5ab33 75 const char *subject_name )
be_bryan 0:b74591d5ab33 76 {
be_bryan 0:b74591d5ab33 77 return mbedtls_x509_string_to_names( &ctx->subject, subject_name );
be_bryan 0:b74591d5ab33 78 }
be_bryan 0:b74591d5ab33 79
be_bryan 0:b74591d5ab33 80 int mbedtls_x509write_csr_set_extension( mbedtls_x509write_csr *ctx,
be_bryan 0:b74591d5ab33 81 const char *oid, size_t oid_len,
be_bryan 0:b74591d5ab33 82 const unsigned char *val, size_t val_len )
be_bryan 0:b74591d5ab33 83 {
be_bryan 0:b74591d5ab33 84 return mbedtls_x509_set_extension( &ctx->extensions, oid, oid_len,
be_bryan 0:b74591d5ab33 85 0, val, val_len );
be_bryan 0:b74591d5ab33 86 }
be_bryan 0:b74591d5ab33 87
be_bryan 0:b74591d5ab33 88 int mbedtls_x509write_csr_set_key_usage( mbedtls_x509write_csr *ctx, unsigned char key_usage )
be_bryan 0:b74591d5ab33 89 {
be_bryan 0:b74591d5ab33 90 unsigned char buf[4];
be_bryan 0:b74591d5ab33 91 unsigned char *c;
be_bryan 0:b74591d5ab33 92 int ret;
be_bryan 0:b74591d5ab33 93
be_bryan 0:b74591d5ab33 94 c = buf + 4;
be_bryan 0:b74591d5ab33 95
be_bryan 0:b74591d5ab33 96 if( ( ret = mbedtls_asn1_write_bitstring( &c, buf, &key_usage, 7 ) ) != 4 )
be_bryan 0:b74591d5ab33 97 return( ret );
be_bryan 0:b74591d5ab33 98
be_bryan 0:b74591d5ab33 99 ret = mbedtls_x509write_csr_set_extension( ctx, MBEDTLS_OID_KEY_USAGE,
be_bryan 0:b74591d5ab33 100 MBEDTLS_OID_SIZE( MBEDTLS_OID_KEY_USAGE ),
be_bryan 0:b74591d5ab33 101 buf, 4 );
be_bryan 0:b74591d5ab33 102 if( ret != 0 )
be_bryan 0:b74591d5ab33 103 return( ret );
be_bryan 0:b74591d5ab33 104
be_bryan 0:b74591d5ab33 105 return( 0 );
be_bryan 0:b74591d5ab33 106 }
be_bryan 0:b74591d5ab33 107
be_bryan 0:b74591d5ab33 108 int mbedtls_x509write_csr_set_ns_cert_type( mbedtls_x509write_csr *ctx,
be_bryan 0:b74591d5ab33 109 unsigned char ns_cert_type )
be_bryan 0:b74591d5ab33 110 {
be_bryan 0:b74591d5ab33 111 unsigned char buf[4];
be_bryan 0:b74591d5ab33 112 unsigned char *c;
be_bryan 0:b74591d5ab33 113 int ret;
be_bryan 0:b74591d5ab33 114
be_bryan 0:b74591d5ab33 115 c = buf + 4;
be_bryan 0:b74591d5ab33 116
be_bryan 0:b74591d5ab33 117 if( ( ret = mbedtls_asn1_write_bitstring( &c, buf, &ns_cert_type, 8 ) ) != 4 )
be_bryan 0:b74591d5ab33 118 return( ret );
be_bryan 0:b74591d5ab33 119
be_bryan 0:b74591d5ab33 120 ret = mbedtls_x509write_csr_set_extension( ctx, MBEDTLS_OID_NS_CERT_TYPE,
be_bryan 0:b74591d5ab33 121 MBEDTLS_OID_SIZE( MBEDTLS_OID_NS_CERT_TYPE ),
be_bryan 0:b74591d5ab33 122 buf, 4 );
be_bryan 0:b74591d5ab33 123 if( ret != 0 )
be_bryan 0:b74591d5ab33 124 return( ret );
be_bryan 0:b74591d5ab33 125
be_bryan 0:b74591d5ab33 126 return( 0 );
be_bryan 0:b74591d5ab33 127 }
be_bryan 0:b74591d5ab33 128
be_bryan 0:b74591d5ab33 129 int mbedtls_x509write_csr_der( mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size,
be_bryan 0:b74591d5ab33 130 int (*f_rng)(void *, unsigned char *, size_t),
be_bryan 0:b74591d5ab33 131 void *p_rng )
be_bryan 0:b74591d5ab33 132 {
be_bryan 0:b74591d5ab33 133 int ret;
be_bryan 0:b74591d5ab33 134 const char *sig_oid;
be_bryan 0:b74591d5ab33 135 size_t sig_oid_len = 0;
be_bryan 0:b74591d5ab33 136 unsigned char *c, *c2;
be_bryan 0:b74591d5ab33 137 unsigned char hash[64];
be_bryan 0:b74591d5ab33 138 unsigned char sig[MBEDTLS_MPI_MAX_SIZE];
be_bryan 0:b74591d5ab33 139 unsigned char tmp_buf[2048];
be_bryan 0:b74591d5ab33 140 size_t pub_len = 0, sig_and_oid_len = 0, sig_len;
be_bryan 0:b74591d5ab33 141 size_t len = 0;
be_bryan 0:b74591d5ab33 142 mbedtls_pk_type_t pk_alg;
be_bryan 0:b74591d5ab33 143
be_bryan 0:b74591d5ab33 144 /*
be_bryan 0:b74591d5ab33 145 * Prepare data to be signed in tmp_buf
be_bryan 0:b74591d5ab33 146 */
be_bryan 0:b74591d5ab33 147 c = tmp_buf + sizeof( tmp_buf );
be_bryan 0:b74591d5ab33 148
be_bryan 0:b74591d5ab33 149 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_extensions( &c, tmp_buf, ctx->extensions ) );
be_bryan 0:b74591d5ab33 150
be_bryan 0:b74591d5ab33 151 if( len )
be_bryan 0:b74591d5ab33 152 {
be_bryan 0:b74591d5ab33 153 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
be_bryan 0:b74591d5ab33 154 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
be_bryan 0:b74591d5ab33 155 MBEDTLS_ASN1_SEQUENCE ) );
be_bryan 0:b74591d5ab33 156
be_bryan 0:b74591d5ab33 157 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
be_bryan 0:b74591d5ab33 158 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
be_bryan 0:b74591d5ab33 159 MBEDTLS_ASN1_SET ) );
be_bryan 0:b74591d5ab33 160
be_bryan 0:b74591d5ab33 161 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( &c, tmp_buf, MBEDTLS_OID_PKCS9_CSR_EXT_REQ,
be_bryan 0:b74591d5ab33 162 MBEDTLS_OID_SIZE( MBEDTLS_OID_PKCS9_CSR_EXT_REQ ) ) );
be_bryan 0:b74591d5ab33 163
be_bryan 0:b74591d5ab33 164 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
be_bryan 0:b74591d5ab33 165 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
be_bryan 0:b74591d5ab33 166 MBEDTLS_ASN1_SEQUENCE ) );
be_bryan 0:b74591d5ab33 167 }
be_bryan 0:b74591d5ab33 168
be_bryan 0:b74591d5ab33 169 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
be_bryan 0:b74591d5ab33 170 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
be_bryan 0:b74591d5ab33 171 MBEDTLS_ASN1_CONTEXT_SPECIFIC ) );
be_bryan 0:b74591d5ab33 172
be_bryan 0:b74591d5ab33 173 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_pk_write_pubkey_der( ctx->key,
be_bryan 0:b74591d5ab33 174 tmp_buf, c - tmp_buf ) );
be_bryan 0:b74591d5ab33 175 c -= pub_len;
be_bryan 0:b74591d5ab33 176 len += pub_len;
be_bryan 0:b74591d5ab33 177
be_bryan 0:b74591d5ab33 178 /*
be_bryan 0:b74591d5ab33 179 * Subject ::= Name
be_bryan 0:b74591d5ab33 180 */
be_bryan 0:b74591d5ab33 181 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_names( &c, tmp_buf, ctx->subject ) );
be_bryan 0:b74591d5ab33 182
be_bryan 0:b74591d5ab33 183 /*
be_bryan 0:b74591d5ab33 184 * Version ::= INTEGER { v1(0), v2(1), v3(2) }
be_bryan 0:b74591d5ab33 185 */
be_bryan 0:b74591d5ab33 186 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, tmp_buf, 0 ) );
be_bryan 0:b74591d5ab33 187
be_bryan 0:b74591d5ab33 188 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
be_bryan 0:b74591d5ab33 189 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
be_bryan 0:b74591d5ab33 190 MBEDTLS_ASN1_SEQUENCE ) );
be_bryan 0:b74591d5ab33 191
be_bryan 0:b74591d5ab33 192 /*
be_bryan 0:b74591d5ab33 193 * Prepare signature
be_bryan 0:b74591d5ab33 194 */
be_bryan 0:b74591d5ab33 195 mbedtls_md( mbedtls_md_info_from_type( ctx->md_alg ), c, len, hash );
be_bryan 0:b74591d5ab33 196
be_bryan 0:b74591d5ab33 197 pk_alg = mbedtls_pk_get_type( ctx->key );
be_bryan 0:b74591d5ab33 198 if( pk_alg == MBEDTLS_PK_ECKEY )
be_bryan 0:b74591d5ab33 199 pk_alg = MBEDTLS_PK_ECDSA;
be_bryan 0:b74591d5ab33 200
be_bryan 0:b74591d5ab33 201 if( ( ret = mbedtls_pk_sign( ctx->key, ctx->md_alg, hash, 0, sig, &sig_len,
be_bryan 0:b74591d5ab33 202 f_rng, p_rng ) ) != 0 ||
be_bryan 0:b74591d5ab33 203 ( ret = mbedtls_oid_get_oid_by_sig_alg( pk_alg, ctx->md_alg,
be_bryan 0:b74591d5ab33 204 &sig_oid, &sig_oid_len ) ) != 0 )
be_bryan 0:b74591d5ab33 205 {
be_bryan 0:b74591d5ab33 206 return( ret );
be_bryan 0:b74591d5ab33 207 }
be_bryan 0:b74591d5ab33 208
be_bryan 0:b74591d5ab33 209 /*
be_bryan 0:b74591d5ab33 210 * Write data to output buffer
be_bryan 0:b74591d5ab33 211 */
be_bryan 0:b74591d5ab33 212 c2 = buf + size;
be_bryan 0:b74591d5ab33 213 MBEDTLS_ASN1_CHK_ADD( sig_and_oid_len, mbedtls_x509_write_sig( &c2, buf,
be_bryan 0:b74591d5ab33 214 sig_oid, sig_oid_len, sig, sig_len ) );
be_bryan 0:b74591d5ab33 215
be_bryan 0:b74591d5ab33 216 if( len > (size_t)( c2 - buf ) )
be_bryan 0:b74591d5ab33 217 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
be_bryan 0:b74591d5ab33 218
be_bryan 0:b74591d5ab33 219 c2 -= len;
be_bryan 0:b74591d5ab33 220 memcpy( c2, c, len );
be_bryan 0:b74591d5ab33 221
be_bryan 0:b74591d5ab33 222 len += sig_and_oid_len;
be_bryan 0:b74591d5ab33 223 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c2, buf, len ) );
be_bryan 0:b74591d5ab33 224 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c2, buf, MBEDTLS_ASN1_CONSTRUCTED |
be_bryan 0:b74591d5ab33 225 MBEDTLS_ASN1_SEQUENCE ) );
be_bryan 0:b74591d5ab33 226
be_bryan 0:b74591d5ab33 227 return( (int) len );
be_bryan 0:b74591d5ab33 228 }
be_bryan 0:b74591d5ab33 229
be_bryan 0:b74591d5ab33 230 #define PEM_BEGIN_CSR "-----BEGIN CERTIFICATE REQUEST-----\n"
be_bryan 0:b74591d5ab33 231 #define PEM_END_CSR "-----END CERTIFICATE REQUEST-----\n"
be_bryan 0:b74591d5ab33 232
be_bryan 0:b74591d5ab33 233 #if defined(MBEDTLS_PEM_WRITE_C)
be_bryan 0:b74591d5ab33 234 int mbedtls_x509write_csr_pem( mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size,
be_bryan 0:b74591d5ab33 235 int (*f_rng)(void *, unsigned char *, size_t),
be_bryan 0:b74591d5ab33 236 void *p_rng )
be_bryan 0:b74591d5ab33 237 {
be_bryan 0:b74591d5ab33 238 int ret;
be_bryan 0:b74591d5ab33 239 unsigned char output_buf[4096];
be_bryan 0:b74591d5ab33 240 size_t olen = 0;
be_bryan 0:b74591d5ab33 241
be_bryan 0:b74591d5ab33 242 if( ( ret = mbedtls_x509write_csr_der( ctx, output_buf, sizeof(output_buf),
be_bryan 0:b74591d5ab33 243 f_rng, p_rng ) ) < 0 )
be_bryan 0:b74591d5ab33 244 {
be_bryan 0:b74591d5ab33 245 return( ret );
be_bryan 0:b74591d5ab33 246 }
be_bryan 0:b74591d5ab33 247
be_bryan 0:b74591d5ab33 248 if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_CSR, PEM_END_CSR,
be_bryan 0:b74591d5ab33 249 output_buf + sizeof(output_buf) - ret,
be_bryan 0:b74591d5ab33 250 ret, buf, size, &olen ) ) != 0 )
be_bryan 0:b74591d5ab33 251 {
be_bryan 0:b74591d5ab33 252 return( ret );
be_bryan 0:b74591d5ab33 253 }
be_bryan 0:b74591d5ab33 254
be_bryan 0:b74591d5ab33 255 return( 0 );
be_bryan 0:b74591d5ab33 256 }
be_bryan 0:b74591d5ab33 257 #endif /* MBEDTLS_PEM_WRITE_C */
be_bryan 0:b74591d5ab33 258
be_bryan 0:b74591d5ab33 259 #endif /* MBEDTLS_X509_CSR_WRITE_C */