Willie Solano / mbedtls

mbed TLS Build

Dependents:   Encypting_Funcional

library/asn1parse.c@1:5906897fd9a3, 2019-06-04 (annotated)

Committer:
williequesada
Date:
Tue Jun 04 17:48:29 2019 +0000
Revision:
1:5906897fd9a3
Parent:
0:cdf462088d13 
pablo

Who changed what in which revision?

UserRevisionLine numberNew contents of line
markrad 0:cdf462088d13 1 /*
markrad 0:cdf462088d13 2 * Generic ASN.1 parsing
markrad 0:cdf462088d13 3 *
markrad 0:cdf462088d13 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
markrad 0:cdf462088d13 5 * SPDX-License-Identifier: Apache-2.0
markrad 0:cdf462088d13 6 *
markrad 0:cdf462088d13 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
markrad 0:cdf462088d13 8 * not use this file except in compliance with the License.
markrad 0:cdf462088d13 9 * You may obtain a copy of the License at
markrad 0:cdf462088d13 10 *
markrad 0:cdf462088d13 11 * http://www.apache.org/licenses/LICENSE-2.0
markrad 0:cdf462088d13 12 *
markrad 0:cdf462088d13 13 * Unless required by applicable law or agreed to in writing, software
markrad 0:cdf462088d13 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
markrad 0:cdf462088d13 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
markrad 0:cdf462088d13 16 * See the License for the specific language governing permissions and
markrad 0:cdf462088d13 17 * limitations under the License.
markrad 0:cdf462088d13 18 *
markrad 0:cdf462088d13 19 * This file is part of mbed TLS (https://tls.mbed.org)
markrad 0:cdf462088d13 20 */
markrad 0:cdf462088d13 21
markrad 0:cdf462088d13 22 #if !defined(MBEDTLS_CONFIG_FILE)
markrad 0:cdf462088d13 23 #include "mbedtls/config.h"
markrad 0:cdf462088d13 24 #else
markrad 0:cdf462088d13 25 #include MBEDTLS_CONFIG_FILE
markrad 0:cdf462088d13 26 #endif
markrad 0:cdf462088d13 27
markrad 0:cdf462088d13 28 #if defined(MBEDTLS_ASN1_PARSE_C)
markrad 0:cdf462088d13 29
markrad 0:cdf462088d13 30 #include "mbedtls/asn1.h"
markrad 0:cdf462088d13 31
markrad 0:cdf462088d13 32 #include <string.h>
markrad 0:cdf462088d13 33
markrad 0:cdf462088d13 34 #if defined(MBEDTLS_BIGNUM_C)
markrad 0:cdf462088d13 35 #include "mbedtls/bignum.h"
markrad 0:cdf462088d13 36 #endif
markrad 0:cdf462088d13 37
markrad 0:cdf462088d13 38 #if defined(MBEDTLS_PLATFORM_C)
markrad 0:cdf462088d13 39 #include "mbedtls/platform.h"
markrad 0:cdf462088d13 40 #else
markrad 0:cdf462088d13 41 #include <stdlib.h>
markrad 0:cdf462088d13 42 #define mbedtls_calloc calloc
markrad 0:cdf462088d13 43 #define mbedtls_free free
markrad 0:cdf462088d13 44 #endif
markrad 0:cdf462088d13 45
markrad 0:cdf462088d13 46 /* Implementation that should never be optimized out by the compiler */
markrad 0:cdf462088d13 47 static void mbedtls_zeroize( void *v, size_t n ) {
markrad 0:cdf462088d13 48 volatile unsigned char *p = (unsigned char*)v; while( n-- ) *p++ = 0;
markrad 0:cdf462088d13 49 }
markrad 0:cdf462088d13 50
markrad 0:cdf462088d13 51 /*
markrad 0:cdf462088d13 52 * ASN.1 DER decoding routines
markrad 0:cdf462088d13 53 */
markrad 0:cdf462088d13 54 int mbedtls_asn1_get_len( unsigned char **p,
markrad 0:cdf462088d13 55 const unsigned char *end,
markrad 0:cdf462088d13 56 size_t *len )
markrad 0:cdf462088d13 57 {
markrad 0:cdf462088d13 58 if( ( end - *p ) < 1 )
markrad 0:cdf462088d13 59 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
markrad 0:cdf462088d13 60
markrad 0:cdf462088d13 61 if( ( **p & 0x80 ) == 0 )
markrad 0:cdf462088d13 62 *len = *(*p)++;
markrad 0:cdf462088d13 63 else
markrad 0:cdf462088d13 64 {
markrad 0:cdf462088d13 65 switch( **p & 0x7F )
markrad 0:cdf462088d13 66 {
markrad 0:cdf462088d13 67 case 1:
markrad 0:cdf462088d13 68 if( ( end - *p ) < 2 )
markrad 0:cdf462088d13 69 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
markrad 0:cdf462088d13 70
markrad 0:cdf462088d13 71 *len = (*p)[1];
markrad 0:cdf462088d13 72 (*p) += 2;
markrad 0:cdf462088d13 73 break;
markrad 0:cdf462088d13 74
markrad 0:cdf462088d13 75 case 2:
markrad 0:cdf462088d13 76 if( ( end - *p ) < 3 )
markrad 0:cdf462088d13 77 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
markrad 0:cdf462088d13 78
markrad 0:cdf462088d13 79 *len = ( (size_t)(*p)[1] << 8 ) | (*p)[2];
markrad 0:cdf462088d13 80 (*p) += 3;
markrad 0:cdf462088d13 81 break;
markrad 0:cdf462088d13 82
markrad 0:cdf462088d13 83 case 3:
markrad 0:cdf462088d13 84 if( ( end - *p ) < 4 )
markrad 0:cdf462088d13 85 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
markrad 0:cdf462088d13 86
markrad 0:cdf462088d13 87 *len = ( (size_t)(*p)[1] << 16 ) |
markrad 0:cdf462088d13 88 ( (size_t)(*p)[2] << 8 ) | (*p)[3];
markrad 0:cdf462088d13 89 (*p) += 4;
markrad 0:cdf462088d13 90 break;
markrad 0:cdf462088d13 91
markrad 0:cdf462088d13 92 case 4:
markrad 0:cdf462088d13 93 if( ( end - *p ) < 5 )
markrad 0:cdf462088d13 94 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
markrad 0:cdf462088d13 95
markrad 0:cdf462088d13 96 *len = ( (size_t)(*p)[1] << 24 ) | ( (size_t)(*p)[2] << 16 ) |
markrad 0:cdf462088d13 97 ( (size_t)(*p)[3] << 8 ) | (*p)[4];
markrad 0:cdf462088d13 98 (*p) += 5;
markrad 0:cdf462088d13 99 break;
markrad 0:cdf462088d13 100
markrad 0:cdf462088d13 101 default:
markrad 0:cdf462088d13 102 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
markrad 0:cdf462088d13 103 }
markrad 0:cdf462088d13 104 }
markrad 0:cdf462088d13 105
markrad 0:cdf462088d13 106 if( *len > (size_t) ( end - *p ) )
markrad 0:cdf462088d13 107 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
markrad 0:cdf462088d13 108
markrad 0:cdf462088d13 109 return( 0 );
markrad 0:cdf462088d13 110 }
markrad 0:cdf462088d13 111
markrad 0:cdf462088d13 112 int mbedtls_asn1_get_tag( unsigned char **p,
markrad 0:cdf462088d13 113 const unsigned char *end,
markrad 0:cdf462088d13 114 size_t *len, int tag )
markrad 0:cdf462088d13 115 {
markrad 0:cdf462088d13 116 if( ( end - *p ) < 1 )
markrad 0:cdf462088d13 117 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
markrad 0:cdf462088d13 118
markrad 0:cdf462088d13 119 if( **p != tag )
markrad 0:cdf462088d13 120 return( MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
markrad 0:cdf462088d13 121
markrad 0:cdf462088d13 122 (*p)++;
markrad 0:cdf462088d13 123
markrad 0:cdf462088d13 124 return( mbedtls_asn1_get_len( p, end, len ) );
markrad 0:cdf462088d13 125 }
markrad 0:cdf462088d13 126
markrad 0:cdf462088d13 127 int mbedtls_asn1_get_bool( unsigned char **p,
markrad 0:cdf462088d13 128 const unsigned char *end,
markrad 0:cdf462088d13 129 int *val )
markrad 0:cdf462088d13 130 {
markrad 0:cdf462088d13 131 int ret;
markrad 0:cdf462088d13 132 size_t len;
markrad 0:cdf462088d13 133
markrad 0:cdf462088d13 134 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_BOOLEAN ) ) != 0 )
markrad 0:cdf462088d13 135 return( ret );
markrad 0:cdf462088d13 136
markrad 0:cdf462088d13 137 if( len != 1 )
markrad 0:cdf462088d13 138 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
markrad 0:cdf462088d13 139
markrad 0:cdf462088d13 140 *val = ( **p != 0 ) ? 1 : 0;
markrad 0:cdf462088d13 141 (*p)++;
markrad 0:cdf462088d13 142
markrad 0:cdf462088d13 143 return( 0 );
markrad 0:cdf462088d13 144 }
markrad 0:cdf462088d13 145
markrad 0:cdf462088d13 146 int mbedtls_asn1_get_int( unsigned char **p,
markrad 0:cdf462088d13 147 const unsigned char *end,
markrad 0:cdf462088d13 148 int *val )
markrad 0:cdf462088d13 149 {
markrad 0:cdf462088d13 150 int ret;
markrad 0:cdf462088d13 151 size_t len;
markrad 0:cdf462088d13 152
markrad 0:cdf462088d13 153 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
markrad 0:cdf462088d13 154 return( ret );
markrad 0:cdf462088d13 155
markrad 0:cdf462088d13 156 if( len == 0 || len > sizeof( int ) || ( **p & 0x80 ) != 0 )
markrad 0:cdf462088d13 157 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
markrad 0:cdf462088d13 158
markrad 0:cdf462088d13 159 *val = 0;
markrad 0:cdf462088d13 160
markrad 0:cdf462088d13 161 while( len-- > 0 )
markrad 0:cdf462088d13 162 {
markrad 0:cdf462088d13 163 *val = ( *val << 8 ) | **p;
markrad 0:cdf462088d13 164 (*p)++;
markrad 0:cdf462088d13 165 }
markrad 0:cdf462088d13 166
markrad 0:cdf462088d13 167 return( 0 );
markrad 0:cdf462088d13 168 }
markrad 0:cdf462088d13 169
markrad 0:cdf462088d13 170 #if defined(MBEDTLS_BIGNUM_C)
markrad 0:cdf462088d13 171 int mbedtls_asn1_get_mpi( unsigned char **p,
markrad 0:cdf462088d13 172 const unsigned char *end,
markrad 0:cdf462088d13 173 mbedtls_mpi *X )
markrad 0:cdf462088d13 174 {
markrad 0:cdf462088d13 175 int ret;
markrad 0:cdf462088d13 176 size_t len;
markrad 0:cdf462088d13 177
markrad 0:cdf462088d13 178 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
markrad 0:cdf462088d13 179 return( ret );
markrad 0:cdf462088d13 180
markrad 0:cdf462088d13 181 ret = mbedtls_mpi_read_binary( X, *p, len );
markrad 0:cdf462088d13 182
markrad 0:cdf462088d13 183 *p += len;
markrad 0:cdf462088d13 184
markrad 0:cdf462088d13 185 return( ret );
markrad 0:cdf462088d13 186 }
markrad 0:cdf462088d13 187 #endif /* MBEDTLS_BIGNUM_C */
markrad 0:cdf462088d13 188
markrad 0:cdf462088d13 189 int mbedtls_asn1_get_bitstring( unsigned char **p, const unsigned char *end,
markrad 0:cdf462088d13 190 mbedtls_asn1_bitstring *bs)
markrad 0:cdf462088d13 191 {
markrad 0:cdf462088d13 192 int ret;
markrad 0:cdf462088d13 193
markrad 0:cdf462088d13 194 /* Certificate type is a single byte bitstring */
markrad 0:cdf462088d13 195 if( ( ret = mbedtls_asn1_get_tag( p, end, &bs->len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
markrad 0:cdf462088d13 196 return( ret );
markrad 0:cdf462088d13 197
markrad 0:cdf462088d13 198 /* Check length, subtract one for actual bit string length */
markrad 0:cdf462088d13 199 if( bs->len < 1 )
markrad 0:cdf462088d13 200 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
markrad 0:cdf462088d13 201 bs->len -= 1;
markrad 0:cdf462088d13 202
markrad 0:cdf462088d13 203 /* Get number of unused bits, ensure unused bits <= 7 */
markrad 0:cdf462088d13 204 bs->unused_bits = **p;
markrad 0:cdf462088d13 205 if( bs->unused_bits > 7 )
markrad 0:cdf462088d13 206 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
markrad 0:cdf462088d13 207 (*p)++;
markrad 0:cdf462088d13 208
markrad 0:cdf462088d13 209 /* Get actual bitstring */
markrad 0:cdf462088d13 210 bs->p = *p;
markrad 0:cdf462088d13 211 *p += bs->len;
markrad 0:cdf462088d13 212
markrad 0:cdf462088d13 213 if( *p != end )
markrad 0:cdf462088d13 214 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
markrad 0:cdf462088d13 215
markrad 0:cdf462088d13 216 return( 0 );
markrad 0:cdf462088d13 217 }
markrad 0:cdf462088d13 218
markrad 0:cdf462088d13 219 /*
markrad 0:cdf462088d13 220 * Get a bit string without unused bits
markrad 0:cdf462088d13 221 */
markrad 0:cdf462088d13 222 int mbedtls_asn1_get_bitstring_null( unsigned char **p, const unsigned char *end,
markrad 0:cdf462088d13 223 size_t *len )
markrad 0:cdf462088d13 224 {
markrad 0:cdf462088d13 225 int ret;
markrad 0:cdf462088d13 226
markrad 0:cdf462088d13 227 if( ( ret = mbedtls_asn1_get_tag( p, end, len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
markrad 0:cdf462088d13 228 return( ret );
markrad 0:cdf462088d13 229
markrad 0:cdf462088d13 230 if( (*len)-- < 2 || *(*p)++ != 0 )
markrad 0:cdf462088d13 231 return( MBEDTLS_ERR_ASN1_INVALID_DATA );
markrad 0:cdf462088d13 232
markrad 0:cdf462088d13 233 return( 0 );
markrad 0:cdf462088d13 234 }
markrad 0:cdf462088d13 235
markrad 0:cdf462088d13 236
markrad 0:cdf462088d13 237
markrad 0:cdf462088d13 238 /*
markrad 0:cdf462088d13 239 * Parses and splits an ASN.1 "SEQUENCE OF <tag>"
markrad 0:cdf462088d13 240 */
markrad 0:cdf462088d13 241 int mbedtls_asn1_get_sequence_of( unsigned char **p,
markrad 0:cdf462088d13 242 const unsigned char *end,
markrad 0:cdf462088d13 243 mbedtls_asn1_sequence *cur,
markrad 0:cdf462088d13 244 int tag)
markrad 0:cdf462088d13 245 {
markrad 0:cdf462088d13 246 int ret;
markrad 0:cdf462088d13 247 size_t len;
markrad 0:cdf462088d13 248 mbedtls_asn1_buf *buf;
markrad 0:cdf462088d13 249
markrad 0:cdf462088d13 250 /* Get main sequence tag */
markrad 0:cdf462088d13 251 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
markrad 0:cdf462088d13 252 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
markrad 0:cdf462088d13 253 return( ret );
markrad 0:cdf462088d13 254
markrad 0:cdf462088d13 255 if( *p + len != end )
markrad 0:cdf462088d13 256 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
markrad 0:cdf462088d13 257
markrad 0:cdf462088d13 258 while( *p < end )
markrad 0:cdf462088d13 259 {
markrad 0:cdf462088d13 260 buf = &(cur->buf);
markrad 0:cdf462088d13 261 buf->tag = **p;
markrad 0:cdf462088d13 262
markrad 0:cdf462088d13 263 if( ( ret = mbedtls_asn1_get_tag( p, end, &buf->len, tag ) ) != 0 )
markrad 0:cdf462088d13 264 return( ret );
markrad 0:cdf462088d13 265
markrad 0:cdf462088d13 266 buf->p = *p;
markrad 0:cdf462088d13 267 *p += buf->len;
markrad 0:cdf462088d13 268
markrad 0:cdf462088d13 269 /* Allocate and assign next pointer */
markrad 0:cdf462088d13 270 if( *p < end )
markrad 0:cdf462088d13 271 {
markrad 0:cdf462088d13 272 cur->next = (mbedtls_asn1_sequence*)mbedtls_calloc( 1,
markrad 0:cdf462088d13 273 sizeof( mbedtls_asn1_sequence ) );
markrad 0:cdf462088d13 274
markrad 0:cdf462088d13 275 if( cur->next == NULL )
markrad 0:cdf462088d13 276 return( MBEDTLS_ERR_ASN1_ALLOC_FAILED );
markrad 0:cdf462088d13 277
markrad 0:cdf462088d13 278 cur = cur->next;
markrad 0:cdf462088d13 279 }
markrad 0:cdf462088d13 280 }
markrad 0:cdf462088d13 281
markrad 0:cdf462088d13 282 /* Set final sequence entry's next pointer to NULL */
markrad 0:cdf462088d13 283 cur->next = NULL;
markrad 0:cdf462088d13 284
markrad 0:cdf462088d13 285 if( *p != end )
markrad 0:cdf462088d13 286 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
markrad 0:cdf462088d13 287
markrad 0:cdf462088d13 288 return( 0 );
markrad 0:cdf462088d13 289 }
markrad 0:cdf462088d13 290
markrad 0:cdf462088d13 291 int mbedtls_asn1_get_alg( unsigned char **p,
markrad 0:cdf462088d13 292 const unsigned char *end,
markrad 0:cdf462088d13 293 mbedtls_asn1_buf *alg, mbedtls_asn1_buf *params )
markrad 0:cdf462088d13 294 {
markrad 0:cdf462088d13 295 int ret;
markrad 0:cdf462088d13 296 size_t len;
markrad 0:cdf462088d13 297
markrad 0:cdf462088d13 298 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
markrad 0:cdf462088d13 299 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
markrad 0:cdf462088d13 300 return( ret );
markrad 0:cdf462088d13 301
markrad 0:cdf462088d13 302 if( ( end - *p ) < 1 )
markrad 0:cdf462088d13 303 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
markrad 0:cdf462088d13 304
markrad 0:cdf462088d13 305 alg->tag = **p;
markrad 0:cdf462088d13 306 end = *p + len;
markrad 0:cdf462088d13 307
markrad 0:cdf462088d13 308 if( ( ret = mbedtls_asn1_get_tag( p, end, &alg->len, MBEDTLS_ASN1_OID ) ) != 0 )
markrad 0:cdf462088d13 309 return( ret );
markrad 0:cdf462088d13 310
markrad 0:cdf462088d13 311 alg->p = *p;
markrad 0:cdf462088d13 312 *p += alg->len;
markrad 0:cdf462088d13 313
markrad 0:cdf462088d13 314 if( *p == end )
markrad 0:cdf462088d13 315 {
markrad 0:cdf462088d13 316 mbedtls_zeroize( params, sizeof(mbedtls_asn1_buf) );
markrad 0:cdf462088d13 317 return( 0 );
markrad 0:cdf462088d13 318 }
markrad 0:cdf462088d13 319
markrad 0:cdf462088d13 320 params->tag = **p;
markrad 0:cdf462088d13 321 (*p)++;
markrad 0:cdf462088d13 322
markrad 0:cdf462088d13 323 if( ( ret = mbedtls_asn1_get_len( p, end, &params->len ) ) != 0 )
markrad 0:cdf462088d13 324 return( ret );
markrad 0:cdf462088d13 325
markrad 0:cdf462088d13 326 params->p = *p;
markrad 0:cdf462088d13 327 *p += params->len;
markrad 0:cdf462088d13 328
markrad 0:cdf462088d13 329 if( *p != end )
markrad 0:cdf462088d13 330 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
markrad 0:cdf462088d13 331
markrad 0:cdf462088d13 332 return( 0 );
markrad 0:cdf462088d13 333 }
markrad 0:cdf462088d13 334
markrad 0:cdf462088d13 335 int mbedtls_asn1_get_alg_null( unsigned char **p,
markrad 0:cdf462088d13 336 const unsigned char *end,
markrad 0:cdf462088d13 337 mbedtls_asn1_buf *alg )
markrad 0:cdf462088d13 338 {
markrad 0:cdf462088d13 339 int ret;
markrad 0:cdf462088d13 340 mbedtls_asn1_buf params;
markrad 0:cdf462088d13 341
markrad 0:cdf462088d13 342 memset( &params, 0, sizeof(mbedtls_asn1_buf) );
markrad 0:cdf462088d13 343
markrad 0:cdf462088d13 344 if( ( ret = mbedtls_asn1_get_alg( p, end, alg, &params ) ) != 0 )
markrad 0:cdf462088d13 345 return( ret );
markrad 0:cdf462088d13 346
markrad 0:cdf462088d13 347 if( ( params.tag != MBEDTLS_ASN1_NULL && params.tag != 0 ) || params.len != 0 )
markrad 0:cdf462088d13 348 return( MBEDTLS_ERR_ASN1_INVALID_DATA );
markrad 0:cdf462088d13 349
markrad 0:cdf462088d13 350 return( 0 );
markrad 0:cdf462088d13 351 }
markrad 0:cdf462088d13 352
markrad 0:cdf462088d13 353 void mbedtls_asn1_free_named_data( mbedtls_asn1_named_data *cur )
markrad 0:cdf462088d13 354 {
markrad 0:cdf462088d13 355 if( cur == NULL )
markrad 0:cdf462088d13 356 return;
markrad 0:cdf462088d13 357
markrad 0:cdf462088d13 358 mbedtls_free( cur->oid.p );
markrad 0:cdf462088d13 359 mbedtls_free( cur->val.p );
markrad 0:cdf462088d13 360
markrad 0:cdf462088d13 361 mbedtls_zeroize( cur, sizeof( mbedtls_asn1_named_data ) );
markrad 0:cdf462088d13 362 }
markrad 0:cdf462088d13 363
markrad 0:cdf462088d13 364 void mbedtls_asn1_free_named_data_list( mbedtls_asn1_named_data **head )
markrad 0:cdf462088d13 365 {
markrad 0:cdf462088d13 366 mbedtls_asn1_named_data *cur;
markrad 0:cdf462088d13 367
markrad 0:cdf462088d13 368 while( ( cur = *head ) != NULL )
markrad 0:cdf462088d13 369 {
markrad 0:cdf462088d13 370 *head = cur->next;
markrad 0:cdf462088d13 371 mbedtls_asn1_free_named_data( cur );
markrad 0:cdf462088d13 372 mbedtls_free( cur );
markrad 0:cdf462088d13 373 }
markrad 0:cdf462088d13 374 }
markrad 0:cdf462088d13 375
markrad 0:cdf462088d13 376 mbedtls_asn1_named_data *mbedtls_asn1_find_named_data( mbedtls_asn1_named_data *list,
markrad 0:cdf462088d13 377 const char *oid, size_t len )
markrad 0:cdf462088d13 378 {
markrad 0:cdf462088d13 379 while( list != NULL )
markrad 0:cdf462088d13 380 {
markrad 0:cdf462088d13 381 if( list->oid.len == len &&
markrad 0:cdf462088d13 382 memcmp( list->oid.p, oid, len ) == 0 )
markrad 0:cdf462088d13 383 {
markrad 0:cdf462088d13 384 break;
markrad 0:cdf462088d13 385 }
markrad 0:cdf462088d13 386
markrad 0:cdf462088d13 387 list = list->next;
markrad 0:cdf462088d13 388 }
markrad 0:cdf462088d13 389
markrad 0:cdf462088d13 390 return( list );
markrad 0:cdf462088d13 391 }
markrad 0:cdf462088d13 392
markrad 0:cdf462088d13 393 #endif /* MBEDTLS_ASN1_PARSE_C */