erkin yucel / mbed-os

mbed os with nrf51 internal bandgap enabled to read battery level

Dependents:   BLE_file_test BLE_Blink ExternalEncoder

features/mbedtls/src/x509write_csr.c@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 /*
elessair 0:f269e3021894 2 * X.509 Certificate Signing Request writing
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
elessair 0:f269e3021894 5 * SPDX-License-Identifier: Apache-2.0
elessair 0:f269e3021894 6 *
elessair 0:f269e3021894 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
elessair 0:f269e3021894 8 * not use this file except in compliance with the License.
elessair 0:f269e3021894 9 * You may obtain a copy of the License at
elessair 0:f269e3021894 10 *
elessair 0:f269e3021894 11 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 12 *
elessair 0:f269e3021894 13 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
elessair 0:f269e3021894 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 16 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 17 * limitations under the License.
elessair 0:f269e3021894 18 *
elessair 0:f269e3021894 19 * This file is part of mbed TLS (https://tls.mbed.org)
elessair 0:f269e3021894 20 */
elessair 0:f269e3021894 21 /*
elessair 0:f269e3021894 22 * References:
elessair 0:f269e3021894 23 * - CSRs: PKCS#10 v1.7 aka RFC 2986
elessair 0:f269e3021894 24 * - attributes: PKCS#9 v2.0 aka RFC 2985
elessair 0:f269e3021894 25 */
elessair 0:f269e3021894 26
elessair 0:f269e3021894 27 #if !defined(MBEDTLS_CONFIG_FILE)
elessair 0:f269e3021894 28 #include "mbedtls/config.h"
elessair 0:f269e3021894 29 #else
elessair 0:f269e3021894 30 #include MBEDTLS_CONFIG_FILE
elessair 0:f269e3021894 31 #endif
elessair 0:f269e3021894 32
elessair 0:f269e3021894 33 #if defined(MBEDTLS_X509_CSR_WRITE_C)
elessair 0:f269e3021894 34
elessair 0:f269e3021894 35 #include "mbedtls/x509_csr.h"
elessair 0:f269e3021894 36 #include "mbedtls/oid.h"
elessair 0:f269e3021894 37 #include "mbedtls/asn1write.h"
elessair 0:f269e3021894 38
elessair 0:f269e3021894 39 #include <string.h>
elessair 0:f269e3021894 40 #include <stdlib.h>
elessair 0:f269e3021894 41
elessair 0:f269e3021894 42 #if defined(MBEDTLS_PEM_WRITE_C)
elessair 0:f269e3021894 43 #include "mbedtls/pem.h"
elessair 0:f269e3021894 44 #endif
elessair 0:f269e3021894 45
elessair 0:f269e3021894 46 /* Implementation that should never be optimized out by the compiler */
elessair 0:f269e3021894 47 static void mbedtls_zeroize( void *v, size_t n ) {
elessair 0:f269e3021894 48 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
elessair 0:f269e3021894 49 }
elessair 0:f269e3021894 50
elessair 0:f269e3021894 51 void mbedtls_x509write_csr_init( mbedtls_x509write_csr *ctx )
elessair 0:f269e3021894 52 {
elessair 0:f269e3021894 53 memset( ctx, 0, sizeof(mbedtls_x509write_csr) );
elessair 0:f269e3021894 54 }
elessair 0:f269e3021894 55
elessair 0:f269e3021894 56 void mbedtls_x509write_csr_free( mbedtls_x509write_csr *ctx )
elessair 0:f269e3021894 57 {
elessair 0:f269e3021894 58 mbedtls_asn1_free_named_data_list( &ctx->subject );
elessair 0:f269e3021894 59 mbedtls_asn1_free_named_data_list( &ctx->extensions );
elessair 0:f269e3021894 60
elessair 0:f269e3021894 61 mbedtls_zeroize( ctx, sizeof(mbedtls_x509write_csr) );
elessair 0:f269e3021894 62 }
elessair 0:f269e3021894 63
elessair 0:f269e3021894 64 void mbedtls_x509write_csr_set_md_alg( mbedtls_x509write_csr *ctx, mbedtls_md_type_t md_alg )
elessair 0:f269e3021894 65 {
elessair 0:f269e3021894 66 ctx->md_alg = md_alg;
elessair 0:f269e3021894 67 }
elessair 0:f269e3021894 68
elessair 0:f269e3021894 69 void mbedtls_x509write_csr_set_key( mbedtls_x509write_csr *ctx, mbedtls_pk_context *key )
elessair 0:f269e3021894 70 {
elessair 0:f269e3021894 71 ctx->key = key;
elessair 0:f269e3021894 72 }
elessair 0:f269e3021894 73
elessair 0:f269e3021894 74 int mbedtls_x509write_csr_set_subject_name( mbedtls_x509write_csr *ctx,
elessair 0:f269e3021894 75 const char *subject_name )
elessair 0:f269e3021894 76 {
elessair 0:f269e3021894 77 return mbedtls_x509_string_to_names( &ctx->subject, subject_name );
elessair 0:f269e3021894 78 }
elessair 0:f269e3021894 79
elessair 0:f269e3021894 80 int mbedtls_x509write_csr_set_extension( mbedtls_x509write_csr *ctx,
elessair 0:f269e3021894 81 const char *oid, size_t oid_len,
elessair 0:f269e3021894 82 const unsigned char *val, size_t val_len )
elessair 0:f269e3021894 83 {
elessair 0:f269e3021894 84 return mbedtls_x509_set_extension( &ctx->extensions, oid, oid_len,
elessair 0:f269e3021894 85 0, val, val_len );
elessair 0:f269e3021894 86 }
elessair 0:f269e3021894 87
elessair 0:f269e3021894 88 int mbedtls_x509write_csr_set_key_usage( mbedtls_x509write_csr *ctx, unsigned char key_usage )
elessair 0:f269e3021894 89 {
elessair 0:f269e3021894 90 unsigned char buf[4];
elessair 0:f269e3021894 91 unsigned char *c;
elessair 0:f269e3021894 92 int ret;
elessair 0:f269e3021894 93
elessair 0:f269e3021894 94 c = buf + 4;
elessair 0:f269e3021894 95
elessair 0:f269e3021894 96 if( ( ret = mbedtls_asn1_write_bitstring( &c, buf, &key_usage, 7 ) ) != 4 )
elessair 0:f269e3021894 97 return( ret );
elessair 0:f269e3021894 98
elessair 0:f269e3021894 99 ret = mbedtls_x509write_csr_set_extension( ctx, MBEDTLS_OID_KEY_USAGE,
elessair 0:f269e3021894 100 MBEDTLS_OID_SIZE( MBEDTLS_OID_KEY_USAGE ),
elessair 0:f269e3021894 101 buf, 4 );
elessair 0:f269e3021894 102 if( ret != 0 )
elessair 0:f269e3021894 103 return( ret );
elessair 0:f269e3021894 104
elessair 0:f269e3021894 105 return( 0 );
elessair 0:f269e3021894 106 }
elessair 0:f269e3021894 107
elessair 0:f269e3021894 108 int mbedtls_x509write_csr_set_ns_cert_type( mbedtls_x509write_csr *ctx,
elessair 0:f269e3021894 109 unsigned char ns_cert_type )
elessair 0:f269e3021894 110 {
elessair 0:f269e3021894 111 unsigned char buf[4];
elessair 0:f269e3021894 112 unsigned char *c;
elessair 0:f269e3021894 113 int ret;
elessair 0:f269e3021894 114
elessair 0:f269e3021894 115 c = buf + 4;
elessair 0:f269e3021894 116
elessair 0:f269e3021894 117 if( ( ret = mbedtls_asn1_write_bitstring( &c, buf, &ns_cert_type, 8 ) ) != 4 )
elessair 0:f269e3021894 118 return( ret );
elessair 0:f269e3021894 119
elessair 0:f269e3021894 120 ret = mbedtls_x509write_csr_set_extension( ctx, MBEDTLS_OID_NS_CERT_TYPE,
elessair 0:f269e3021894 121 MBEDTLS_OID_SIZE( MBEDTLS_OID_NS_CERT_TYPE ),
elessair 0:f269e3021894 122 buf, 4 );
elessair 0:f269e3021894 123 if( ret != 0 )
elessair 0:f269e3021894 124 return( ret );
elessair 0:f269e3021894 125
elessair 0:f269e3021894 126 return( 0 );
elessair 0:f269e3021894 127 }
elessair 0:f269e3021894 128
elessair 0:f269e3021894 129 int mbedtls_x509write_csr_der( mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size,
elessair 0:f269e3021894 130 int (*f_rng)(void *, unsigned char *, size_t),
elessair 0:f269e3021894 131 void *p_rng )
elessair 0:f269e3021894 132 {
elessair 0:f269e3021894 133 int ret;
elessair 0:f269e3021894 134 const char *sig_oid;
elessair 0:f269e3021894 135 size_t sig_oid_len = 0;
elessair 0:f269e3021894 136 unsigned char *c, *c2;
elessair 0:f269e3021894 137 unsigned char hash[64];
elessair 0:f269e3021894 138 unsigned char sig[MBEDTLS_MPI_MAX_SIZE];
elessair 0:f269e3021894 139 unsigned char tmp_buf[2048];
elessair 0:f269e3021894 140 size_t pub_len = 0, sig_and_oid_len = 0, sig_len;
elessair 0:f269e3021894 141 size_t len = 0;
elessair 0:f269e3021894 142 mbedtls_pk_type_t pk_alg;
elessair 0:f269e3021894 143
elessair 0:f269e3021894 144 /*
elessair 0:f269e3021894 145 * Prepare data to be signed in tmp_buf
elessair 0:f269e3021894 146 */
elessair 0:f269e3021894 147 c = tmp_buf + sizeof( tmp_buf );
elessair 0:f269e3021894 148
elessair 0:f269e3021894 149 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_extensions( &c, tmp_buf, ctx->extensions ) );
elessair 0:f269e3021894 150
elessair 0:f269e3021894 151 if( len )
elessair 0:f269e3021894 152 {
elessair 0:f269e3021894 153 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
elessair 0:f269e3021894 154 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
elessair 0:f269e3021894 155 MBEDTLS_ASN1_SEQUENCE ) );
elessair 0:f269e3021894 156
elessair 0:f269e3021894 157 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
elessair 0:f269e3021894 158 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
elessair 0:f269e3021894 159 MBEDTLS_ASN1_SET ) );
elessair 0:f269e3021894 160
elessair 0:f269e3021894 161 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( &c, tmp_buf, MBEDTLS_OID_PKCS9_CSR_EXT_REQ,
elessair 0:f269e3021894 162 MBEDTLS_OID_SIZE( MBEDTLS_OID_PKCS9_CSR_EXT_REQ ) ) );
elessair 0:f269e3021894 163
elessair 0:f269e3021894 164 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
elessair 0:f269e3021894 165 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
elessair 0:f269e3021894 166 MBEDTLS_ASN1_SEQUENCE ) );
elessair 0:f269e3021894 167 }
elessair 0:f269e3021894 168
elessair 0:f269e3021894 169 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
elessair 0:f269e3021894 170 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
elessair 0:f269e3021894 171 MBEDTLS_ASN1_CONTEXT_SPECIFIC ) );
elessair 0:f269e3021894 172
elessair 0:f269e3021894 173 MBEDTLS_ASN1_CHK_ADD( pub_len, mbedtls_pk_write_pubkey_der( ctx->key,
elessair 0:f269e3021894 174 tmp_buf, c - tmp_buf ) );
elessair 0:f269e3021894 175 c -= pub_len;
elessair 0:f269e3021894 176 len += pub_len;
elessair 0:f269e3021894 177
elessair 0:f269e3021894 178 /*
elessair 0:f269e3021894 179 * Subject ::= Name
elessair 0:f269e3021894 180 */
elessair 0:f269e3021894 181 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_x509_write_names( &c, tmp_buf, ctx->subject ) );
elessair 0:f269e3021894 182
elessair 0:f269e3021894 183 /*
elessair 0:f269e3021894 184 * Version ::= INTEGER { v1(0), v2(1), v3(2) }
elessair 0:f269e3021894 185 */
elessair 0:f269e3021894 186 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_int( &c, tmp_buf, 0 ) );
elessair 0:f269e3021894 187
elessair 0:f269e3021894 188 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c, tmp_buf, len ) );
elessair 0:f269e3021894 189 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c, tmp_buf, MBEDTLS_ASN1_CONSTRUCTED |
elessair 0:f269e3021894 190 MBEDTLS_ASN1_SEQUENCE ) );
elessair 0:f269e3021894 191
elessair 0:f269e3021894 192 /*
elessair 0:f269e3021894 193 * Prepare signature
elessair 0:f269e3021894 194 */
elessair 0:f269e3021894 195 mbedtls_md( mbedtls_md_info_from_type( ctx->md_alg ), c, len, hash );
elessair 0:f269e3021894 196
elessair 0:f269e3021894 197 pk_alg = mbedtls_pk_get_type( ctx->key );
elessair 0:f269e3021894 198 if( pk_alg == MBEDTLS_PK_ECKEY )
elessair 0:f269e3021894 199 pk_alg = MBEDTLS_PK_ECDSA;
elessair 0:f269e3021894 200
elessair 0:f269e3021894 201 if( ( ret = mbedtls_pk_sign( ctx->key, ctx->md_alg, hash, 0, sig, &sig_len,
elessair 0:f269e3021894 202 f_rng, p_rng ) ) != 0 ||
elessair 0:f269e3021894 203 ( ret = mbedtls_oid_get_oid_by_sig_alg( pk_alg, ctx->md_alg,
elessair 0:f269e3021894 204 &sig_oid, &sig_oid_len ) ) != 0 )
elessair 0:f269e3021894 205 {
elessair 0:f269e3021894 206 return( ret );
elessair 0:f269e3021894 207 }
elessair 0:f269e3021894 208
elessair 0:f269e3021894 209 /*
elessair 0:f269e3021894 210 * Write data to output buffer
elessair 0:f269e3021894 211 */
elessair 0:f269e3021894 212 c2 = buf + size;
elessair 0:f269e3021894 213 MBEDTLS_ASN1_CHK_ADD( sig_and_oid_len, mbedtls_x509_write_sig( &c2, buf,
elessair 0:f269e3021894 214 sig_oid, sig_oid_len, sig, sig_len ) );
elessair 0:f269e3021894 215
elessair 0:f269e3021894 216 if( len > (size_t)( c2 - buf ) )
elessair 0:f269e3021894 217 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
elessair 0:f269e3021894 218
elessair 0:f269e3021894 219 c2 -= len;
elessair 0:f269e3021894 220 memcpy( c2, c, len );
elessair 0:f269e3021894 221
elessair 0:f269e3021894 222 len += sig_and_oid_len;
elessair 0:f269e3021894 223 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( &c2, buf, len ) );
elessair 0:f269e3021894 224 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( &c2, buf, MBEDTLS_ASN1_CONSTRUCTED |
elessair 0:f269e3021894 225 MBEDTLS_ASN1_SEQUENCE ) );
elessair 0:f269e3021894 226
elessair 0:f269e3021894 227 return( (int) len );
elessair 0:f269e3021894 228 }
elessair 0:f269e3021894 229
elessair 0:f269e3021894 230 #define PEM_BEGIN_CSR "-----BEGIN CERTIFICATE REQUEST-----\n"
elessair 0:f269e3021894 231 #define PEM_END_CSR "-----END CERTIFICATE REQUEST-----\n"
elessair 0:f269e3021894 232
elessair 0:f269e3021894 233 #if defined(MBEDTLS_PEM_WRITE_C)
elessair 0:f269e3021894 234 int mbedtls_x509write_csr_pem( mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size,
elessair 0:f269e3021894 235 int (*f_rng)(void *, unsigned char *, size_t),
elessair 0:f269e3021894 236 void *p_rng )
elessair 0:f269e3021894 237 {
elessair 0:f269e3021894 238 int ret;
elessair 0:f269e3021894 239 unsigned char output_buf[4096];
elessair 0:f269e3021894 240 size_t olen = 0;
elessair 0:f269e3021894 241
elessair 0:f269e3021894 242 if( ( ret = mbedtls_x509write_csr_der( ctx, output_buf, sizeof(output_buf),
elessair 0:f269e3021894 243 f_rng, p_rng ) ) < 0 )
elessair 0:f269e3021894 244 {
elessair 0:f269e3021894 245 return( ret );
elessair 0:f269e3021894 246 }
elessair 0:f269e3021894 247
elessair 0:f269e3021894 248 if( ( ret = mbedtls_pem_write_buffer( PEM_BEGIN_CSR, PEM_END_CSR,
elessair 0:f269e3021894 249 output_buf + sizeof(output_buf) - ret,
elessair 0:f269e3021894 250 ret, buf, size, &olen ) ) != 0 )
elessair 0:f269e3021894 251 {
elessair 0:f269e3021894 252 return( ret );
elessair 0:f269e3021894 253 }
elessair 0:f269e3021894 254
elessair 0:f269e3021894 255 return( 0 );
elessair 0:f269e3021894 256 }
elessair 0:f269e3021894 257 #endif /* MBEDTLS_PEM_WRITE_C */
elessair 0:f269e3021894 258
elessair 0:f269e3021894 259 #endif /* MBEDTLS_X509_CSR_WRITE_C */