Austin Blackstone / Mbed 2 deprecated client-lwip-lightswitch-demo-expanded

mbed client lightswitch demo

Dependencies:   mbed Socket lwip-eth lwip-sys lwip

Fork of mbed-client-classic-example-lwip by Austin Blackstone

mbedtls/source/asn1parse.c@11:cada08fc8a70, 2016-06-09 (annotated)

Committer:
mbedAustin
Date:
Thu Jun 09 17:08:36 2016 +0000
Revision:
11:cada08fc8a70
Commit for public Consumption

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbedAustin 11:cada08fc8a70 1 /*
mbedAustin 11:cada08fc8a70 2 * Generic ASN.1 parsing
mbedAustin 11:cada08fc8a70 3 *
mbedAustin 11:cada08fc8a70 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
mbedAustin 11:cada08fc8a70 5 * SPDX-License-Identifier: Apache-2.0
mbedAustin 11:cada08fc8a70 6 *
mbedAustin 11:cada08fc8a70 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
mbedAustin 11:cada08fc8a70 8 * not use this file except in compliance with the License.
mbedAustin 11:cada08fc8a70 9 * You may obtain a copy of the License at
mbedAustin 11:cada08fc8a70 10 *
mbedAustin 11:cada08fc8a70 11 * http://www.apache.org/licenses/LICENSE-2.0
mbedAustin 11:cada08fc8a70 12 *
mbedAustin 11:cada08fc8a70 13 * Unless required by applicable law or agreed to in writing, software
mbedAustin 11:cada08fc8a70 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
mbedAustin 11:cada08fc8a70 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbedAustin 11:cada08fc8a70 16 * See the License for the specific language governing permissions and
mbedAustin 11:cada08fc8a70 17 * limitations under the License.
mbedAustin 11:cada08fc8a70 18 *
mbedAustin 11:cada08fc8a70 19 * This file is part of mbed TLS (https://tls.mbed.org)
mbedAustin 11:cada08fc8a70 20 */
mbedAustin 11:cada08fc8a70 21
mbedAustin 11:cada08fc8a70 22 #if !defined(MBEDTLS_CONFIG_FILE)
mbedAustin 11:cada08fc8a70 23 #include "mbedtls/config.h"
mbedAustin 11:cada08fc8a70 24 #else
mbedAustin 11:cada08fc8a70 25 #include MBEDTLS_CONFIG_FILE
mbedAustin 11:cada08fc8a70 26 #endif
mbedAustin 11:cada08fc8a70 27
mbedAustin 11:cada08fc8a70 28 #if defined(MBEDTLS_ASN1_PARSE_C)
mbedAustin 11:cada08fc8a70 29
mbedAustin 11:cada08fc8a70 30 #include "mbedtls/asn1.h"
mbedAustin 11:cada08fc8a70 31
mbedAustin 11:cada08fc8a70 32 #include <string.h>
mbedAustin 11:cada08fc8a70 33
mbedAustin 11:cada08fc8a70 34 #if defined(MBEDTLS_BIGNUM_C)
mbedAustin 11:cada08fc8a70 35 #include "mbedtls/bignum.h"
mbedAustin 11:cada08fc8a70 36 #endif
mbedAustin 11:cada08fc8a70 37
mbedAustin 11:cada08fc8a70 38 #if defined(MBEDTLS_PLATFORM_C)
mbedAustin 11:cada08fc8a70 39 #include "mbedtls/platform.h"
mbedAustin 11:cada08fc8a70 40 #else
mbedAustin 11:cada08fc8a70 41 #include <stdlib.h>
mbedAustin 11:cada08fc8a70 42 #define mbedtls_calloc calloc
mbedAustin 11:cada08fc8a70 43 #define mbedtls_free free
mbedAustin 11:cada08fc8a70 44 #endif
mbedAustin 11:cada08fc8a70 45
mbedAustin 11:cada08fc8a70 46 /* Implementation that should never be optimized out by the compiler */
mbedAustin 11:cada08fc8a70 47 static void mbedtls_zeroize( void *v, size_t n ) {
mbedAustin 11:cada08fc8a70 48 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
mbedAustin 11:cada08fc8a70 49 }
mbedAustin 11:cada08fc8a70 50
mbedAustin 11:cada08fc8a70 51 /*
mbedAustin 11:cada08fc8a70 52 * ASN.1 DER decoding routines
mbedAustin 11:cada08fc8a70 53 */
mbedAustin 11:cada08fc8a70 54 int mbedtls_asn1_get_len( unsigned char **p,
mbedAustin 11:cada08fc8a70 55 const unsigned char *end,
mbedAustin 11:cada08fc8a70 56 size_t *len )
mbedAustin 11:cada08fc8a70 57 {
mbedAustin 11:cada08fc8a70 58 if( ( end - *p ) < 1 )
mbedAustin 11:cada08fc8a70 59 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
mbedAustin 11:cada08fc8a70 60
mbedAustin 11:cada08fc8a70 61 if( ( **p & 0x80 ) == 0 )
mbedAustin 11:cada08fc8a70 62 *len = *(*p)++;
mbedAustin 11:cada08fc8a70 63 else
mbedAustin 11:cada08fc8a70 64 {
mbedAustin 11:cada08fc8a70 65 switch( **p & 0x7F )
mbedAustin 11:cada08fc8a70 66 {
mbedAustin 11:cada08fc8a70 67 case 1:
mbedAustin 11:cada08fc8a70 68 if( ( end - *p ) < 2 )
mbedAustin 11:cada08fc8a70 69 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
mbedAustin 11:cada08fc8a70 70
mbedAustin 11:cada08fc8a70 71 *len = (*p)[1];
mbedAustin 11:cada08fc8a70 72 (*p) += 2;
mbedAustin 11:cada08fc8a70 73 break;
mbedAustin 11:cada08fc8a70 74
mbedAustin 11:cada08fc8a70 75 case 2:
mbedAustin 11:cada08fc8a70 76 if( ( end - *p ) < 3 )
mbedAustin 11:cada08fc8a70 77 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
mbedAustin 11:cada08fc8a70 78
mbedAustin 11:cada08fc8a70 79 *len = ( (size_t)(*p)[1] << 8 ) | (*p)[2];
mbedAustin 11:cada08fc8a70 80 (*p) += 3;
mbedAustin 11:cada08fc8a70 81 break;
mbedAustin 11:cada08fc8a70 82
mbedAustin 11:cada08fc8a70 83 case 3:
mbedAustin 11:cada08fc8a70 84 if( ( end - *p ) < 4 )
mbedAustin 11:cada08fc8a70 85 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
mbedAustin 11:cada08fc8a70 86
mbedAustin 11:cada08fc8a70 87 *len = ( (size_t)(*p)[1] << 16 ) |
mbedAustin 11:cada08fc8a70 88 ( (size_t)(*p)[2] << 8 ) | (*p)[3];
mbedAustin 11:cada08fc8a70 89 (*p) += 4;
mbedAustin 11:cada08fc8a70 90 break;
mbedAustin 11:cada08fc8a70 91
mbedAustin 11:cada08fc8a70 92 case 4:
mbedAustin 11:cada08fc8a70 93 if( ( end - *p ) < 5 )
mbedAustin 11:cada08fc8a70 94 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
mbedAustin 11:cada08fc8a70 95
mbedAustin 11:cada08fc8a70 96 *len = ( (size_t)(*p)[1] << 24 ) | ( (size_t)(*p)[2] << 16 ) |
mbedAustin 11:cada08fc8a70 97 ( (size_t)(*p)[3] << 8 ) | (*p)[4];
mbedAustin 11:cada08fc8a70 98 (*p) += 5;
mbedAustin 11:cada08fc8a70 99 break;
mbedAustin 11:cada08fc8a70 100
mbedAustin 11:cada08fc8a70 101 default:
mbedAustin 11:cada08fc8a70 102 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
mbedAustin 11:cada08fc8a70 103 }
mbedAustin 11:cada08fc8a70 104 }
mbedAustin 11:cada08fc8a70 105
mbedAustin 11:cada08fc8a70 106 if( *len > (size_t) ( end - *p ) )
mbedAustin 11:cada08fc8a70 107 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
mbedAustin 11:cada08fc8a70 108
mbedAustin 11:cada08fc8a70 109 return( 0 );
mbedAustin 11:cada08fc8a70 110 }
mbedAustin 11:cada08fc8a70 111
mbedAustin 11:cada08fc8a70 112 int mbedtls_asn1_get_tag( unsigned char **p,
mbedAustin 11:cada08fc8a70 113 const unsigned char *end,
mbedAustin 11:cada08fc8a70 114 size_t *len, int tag )
mbedAustin 11:cada08fc8a70 115 {
mbedAustin 11:cada08fc8a70 116 if( ( end - *p ) < 1 )
mbedAustin 11:cada08fc8a70 117 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
mbedAustin 11:cada08fc8a70 118
mbedAustin 11:cada08fc8a70 119 if( **p != tag )
mbedAustin 11:cada08fc8a70 120 return( MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
mbedAustin 11:cada08fc8a70 121
mbedAustin 11:cada08fc8a70 122 (*p)++;
mbedAustin 11:cada08fc8a70 123
mbedAustin 11:cada08fc8a70 124 return( mbedtls_asn1_get_len( p, end, len ) );
mbedAustin 11:cada08fc8a70 125 }
mbedAustin 11:cada08fc8a70 126
mbedAustin 11:cada08fc8a70 127 int mbedtls_asn1_get_bool( unsigned char **p,
mbedAustin 11:cada08fc8a70 128 const unsigned char *end,
mbedAustin 11:cada08fc8a70 129 int *val )
mbedAustin 11:cada08fc8a70 130 {
mbedAustin 11:cada08fc8a70 131 int ret;
mbedAustin 11:cada08fc8a70 132 size_t len;
mbedAustin 11:cada08fc8a70 133
mbedAustin 11:cada08fc8a70 134 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_BOOLEAN ) ) != 0 )
mbedAustin 11:cada08fc8a70 135 return( ret );
mbedAustin 11:cada08fc8a70 136
mbedAustin 11:cada08fc8a70 137 if( len != 1 )
mbedAustin 11:cada08fc8a70 138 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
mbedAustin 11:cada08fc8a70 139
mbedAustin 11:cada08fc8a70 140 *val = ( **p != 0 ) ? 1 : 0;
mbedAustin 11:cada08fc8a70 141 (*p)++;
mbedAustin 11:cada08fc8a70 142
mbedAustin 11:cada08fc8a70 143 return( 0 );
mbedAustin 11:cada08fc8a70 144 }
mbedAustin 11:cada08fc8a70 145
mbedAustin 11:cada08fc8a70 146 int mbedtls_asn1_get_int( unsigned char **p,
mbedAustin 11:cada08fc8a70 147 const unsigned char *end,
mbedAustin 11:cada08fc8a70 148 int *val )
mbedAustin 11:cada08fc8a70 149 {
mbedAustin 11:cada08fc8a70 150 int ret;
mbedAustin 11:cada08fc8a70 151 size_t len;
mbedAustin 11:cada08fc8a70 152
mbedAustin 11:cada08fc8a70 153 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
mbedAustin 11:cada08fc8a70 154 return( ret );
mbedAustin 11:cada08fc8a70 155
mbedAustin 11:cada08fc8a70 156 if( len > sizeof( int ) || ( **p & 0x80 ) != 0 )
mbedAustin 11:cada08fc8a70 157 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
mbedAustin 11:cada08fc8a70 158
mbedAustin 11:cada08fc8a70 159 *val = 0;
mbedAustin 11:cada08fc8a70 160
mbedAustin 11:cada08fc8a70 161 while( len-- > 0 )
mbedAustin 11:cada08fc8a70 162 {
mbedAustin 11:cada08fc8a70 163 *val = ( *val << 8 ) | **p;
mbedAustin 11:cada08fc8a70 164 (*p)++;
mbedAustin 11:cada08fc8a70 165 }
mbedAustin 11:cada08fc8a70 166
mbedAustin 11:cada08fc8a70 167 return( 0 );
mbedAustin 11:cada08fc8a70 168 }
mbedAustin 11:cada08fc8a70 169
mbedAustin 11:cada08fc8a70 170 #if defined(MBEDTLS_BIGNUM_C)
mbedAustin 11:cada08fc8a70 171 int mbedtls_asn1_get_mpi( unsigned char **p,
mbedAustin 11:cada08fc8a70 172 const unsigned char *end,
mbedAustin 11:cada08fc8a70 173 mbedtls_mpi *X )
mbedAustin 11:cada08fc8a70 174 {
mbedAustin 11:cada08fc8a70 175 int ret;
mbedAustin 11:cada08fc8a70 176 size_t len;
mbedAustin 11:cada08fc8a70 177
mbedAustin 11:cada08fc8a70 178 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
mbedAustin 11:cada08fc8a70 179 return( ret );
mbedAustin 11:cada08fc8a70 180
mbedAustin 11:cada08fc8a70 181 ret = mbedtls_mpi_read_binary( X, *p, len );
mbedAustin 11:cada08fc8a70 182
mbedAustin 11:cada08fc8a70 183 *p += len;
mbedAustin 11:cada08fc8a70 184
mbedAustin 11:cada08fc8a70 185 return( ret );
mbedAustin 11:cada08fc8a70 186 }
mbedAustin 11:cada08fc8a70 187 #endif /* MBEDTLS_BIGNUM_C */
mbedAustin 11:cada08fc8a70 188
mbedAustin 11:cada08fc8a70 189 int mbedtls_asn1_get_bitstring( unsigned char **p, const unsigned char *end,
mbedAustin 11:cada08fc8a70 190 mbedtls_asn1_bitstring *bs)
mbedAustin 11:cada08fc8a70 191 {
mbedAustin 11:cada08fc8a70 192 int ret;
mbedAustin 11:cada08fc8a70 193
mbedAustin 11:cada08fc8a70 194 /* Certificate type is a single byte bitstring */
mbedAustin 11:cada08fc8a70 195 if( ( ret = mbedtls_asn1_get_tag( p, end, &bs->len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
mbedAustin 11:cada08fc8a70 196 return( ret );
mbedAustin 11:cada08fc8a70 197
mbedAustin 11:cada08fc8a70 198 /* Check length, subtract one for actual bit string length */
mbedAustin 11:cada08fc8a70 199 if( bs->len < 1 )
mbedAustin 11:cada08fc8a70 200 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
mbedAustin 11:cada08fc8a70 201 bs->len -= 1;
mbedAustin 11:cada08fc8a70 202
mbedAustin 11:cada08fc8a70 203 /* Get number of unused bits, ensure unused bits <= 7 */
mbedAustin 11:cada08fc8a70 204 bs->unused_bits = **p;
mbedAustin 11:cada08fc8a70 205 if( bs->unused_bits > 7 )
mbedAustin 11:cada08fc8a70 206 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
mbedAustin 11:cada08fc8a70 207 (*p)++;
mbedAustin 11:cada08fc8a70 208
mbedAustin 11:cada08fc8a70 209 /* Get actual bitstring */
mbedAustin 11:cada08fc8a70 210 bs->p = *p;
mbedAustin 11:cada08fc8a70 211 *p += bs->len;
mbedAustin 11:cada08fc8a70 212
mbedAustin 11:cada08fc8a70 213 if( *p != end )
mbedAustin 11:cada08fc8a70 214 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
mbedAustin 11:cada08fc8a70 215
mbedAustin 11:cada08fc8a70 216 return( 0 );
mbedAustin 11:cada08fc8a70 217 }
mbedAustin 11:cada08fc8a70 218
mbedAustin 11:cada08fc8a70 219 /*
mbedAustin 11:cada08fc8a70 220 * Get a bit string without unused bits
mbedAustin 11:cada08fc8a70 221 */
mbedAustin 11:cada08fc8a70 222 int mbedtls_asn1_get_bitstring_null( unsigned char **p, const unsigned char *end,
mbedAustin 11:cada08fc8a70 223 size_t *len )
mbedAustin 11:cada08fc8a70 224 {
mbedAustin 11:cada08fc8a70 225 int ret;
mbedAustin 11:cada08fc8a70 226
mbedAustin 11:cada08fc8a70 227 if( ( ret = mbedtls_asn1_get_tag( p, end, len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
mbedAustin 11:cada08fc8a70 228 return( ret );
mbedAustin 11:cada08fc8a70 229
mbedAustin 11:cada08fc8a70 230 if( (*len)-- < 2 || *(*p)++ != 0 )
mbedAustin 11:cada08fc8a70 231 return( MBEDTLS_ERR_ASN1_INVALID_DATA );
mbedAustin 11:cada08fc8a70 232
mbedAustin 11:cada08fc8a70 233 return( 0 );
mbedAustin 11:cada08fc8a70 234 }
mbedAustin 11:cada08fc8a70 235
mbedAustin 11:cada08fc8a70 236
mbedAustin 11:cada08fc8a70 237
mbedAustin 11:cada08fc8a70 238 /*
mbedAustin 11:cada08fc8a70 239 * Parses and splits an ASN.1 "SEQUENCE OF <tag>"
mbedAustin 11:cada08fc8a70 240 */
mbedAustin 11:cada08fc8a70 241 int mbedtls_asn1_get_sequence_of( unsigned char **p,
mbedAustin 11:cada08fc8a70 242 const unsigned char *end,
mbedAustin 11:cada08fc8a70 243 mbedtls_asn1_sequence *cur,
mbedAustin 11:cada08fc8a70 244 int tag)
mbedAustin 11:cada08fc8a70 245 {
mbedAustin 11:cada08fc8a70 246 int ret;
mbedAustin 11:cada08fc8a70 247 size_t len;
mbedAustin 11:cada08fc8a70 248 mbedtls_asn1_buf *buf;
mbedAustin 11:cada08fc8a70 249
mbedAustin 11:cada08fc8a70 250 /* Get main sequence tag */
mbedAustin 11:cada08fc8a70 251 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
mbedAustin 11:cada08fc8a70 252 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
mbedAustin 11:cada08fc8a70 253 return( ret );
mbedAustin 11:cada08fc8a70 254
mbedAustin 11:cada08fc8a70 255 if( *p + len != end )
mbedAustin 11:cada08fc8a70 256 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
mbedAustin 11:cada08fc8a70 257
mbedAustin 11:cada08fc8a70 258 while( *p < end )
mbedAustin 11:cada08fc8a70 259 {
mbedAustin 11:cada08fc8a70 260 buf = &(cur->buf);
mbedAustin 11:cada08fc8a70 261 buf->tag = **p;
mbedAustin 11:cada08fc8a70 262
mbedAustin 11:cada08fc8a70 263 if( ( ret = mbedtls_asn1_get_tag( p, end, &buf->len, tag ) ) != 0 )
mbedAustin 11:cada08fc8a70 264 return( ret );
mbedAustin 11:cada08fc8a70 265
mbedAustin 11:cada08fc8a70 266 buf->p = *p;
mbedAustin 11:cada08fc8a70 267 *p += buf->len;
mbedAustin 11:cada08fc8a70 268
mbedAustin 11:cada08fc8a70 269 /* Allocate and assign next pointer */
mbedAustin 11:cada08fc8a70 270 if( *p < end )
mbedAustin 11:cada08fc8a70 271 {
mbedAustin 11:cada08fc8a70 272 cur->next = mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) );
mbedAustin 11:cada08fc8a70 273
mbedAustin 11:cada08fc8a70 274 if( cur->next == NULL )
mbedAustin 11:cada08fc8a70 275 return( MBEDTLS_ERR_ASN1_ALLOC_FAILED );
mbedAustin 11:cada08fc8a70 276
mbedAustin 11:cada08fc8a70 277 cur = cur->next;
mbedAustin 11:cada08fc8a70 278 }
mbedAustin 11:cada08fc8a70 279 }
mbedAustin 11:cada08fc8a70 280
mbedAustin 11:cada08fc8a70 281 /* Set final sequence entry's next pointer to NULL */
mbedAustin 11:cada08fc8a70 282 cur->next = NULL;
mbedAustin 11:cada08fc8a70 283
mbedAustin 11:cada08fc8a70 284 if( *p != end )
mbedAustin 11:cada08fc8a70 285 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
mbedAustin 11:cada08fc8a70 286
mbedAustin 11:cada08fc8a70 287 return( 0 );
mbedAustin 11:cada08fc8a70 288 }
mbedAustin 11:cada08fc8a70 289
mbedAustin 11:cada08fc8a70 290 int mbedtls_asn1_get_alg( unsigned char **p,
mbedAustin 11:cada08fc8a70 291 const unsigned char *end,
mbedAustin 11:cada08fc8a70 292 mbedtls_asn1_buf *alg, mbedtls_asn1_buf *params )
mbedAustin 11:cada08fc8a70 293 {
mbedAustin 11:cada08fc8a70 294 int ret;
mbedAustin 11:cada08fc8a70 295 size_t len;
mbedAustin 11:cada08fc8a70 296
mbedAustin 11:cada08fc8a70 297 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
mbedAustin 11:cada08fc8a70 298 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
mbedAustin 11:cada08fc8a70 299 return( ret );
mbedAustin 11:cada08fc8a70 300
mbedAustin 11:cada08fc8a70 301 if( ( end - *p ) < 1 )
mbedAustin 11:cada08fc8a70 302 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
mbedAustin 11:cada08fc8a70 303
mbedAustin 11:cada08fc8a70 304 alg->tag = **p;
mbedAustin 11:cada08fc8a70 305 end = *p + len;
mbedAustin 11:cada08fc8a70 306
mbedAustin 11:cada08fc8a70 307 if( ( ret = mbedtls_asn1_get_tag( p, end, &alg->len, MBEDTLS_ASN1_OID ) ) != 0 )
mbedAustin 11:cada08fc8a70 308 return( ret );
mbedAustin 11:cada08fc8a70 309
mbedAustin 11:cada08fc8a70 310 alg->p = *p;
mbedAustin 11:cada08fc8a70 311 *p += alg->len;
mbedAustin 11:cada08fc8a70 312
mbedAustin 11:cada08fc8a70 313 if( *p == end )
mbedAustin 11:cada08fc8a70 314 {
mbedAustin 11:cada08fc8a70 315 mbedtls_zeroize( params, sizeof(mbedtls_asn1_buf) );
mbedAustin 11:cada08fc8a70 316 return( 0 );
mbedAustin 11:cada08fc8a70 317 }
mbedAustin 11:cada08fc8a70 318
mbedAustin 11:cada08fc8a70 319 params->tag = **p;
mbedAustin 11:cada08fc8a70 320 (*p)++;
mbedAustin 11:cada08fc8a70 321
mbedAustin 11:cada08fc8a70 322 if( ( ret = mbedtls_asn1_get_len( p, end, &params->len ) ) != 0 )
mbedAustin 11:cada08fc8a70 323 return( ret );
mbedAustin 11:cada08fc8a70 324
mbedAustin 11:cada08fc8a70 325 params->p = *p;
mbedAustin 11:cada08fc8a70 326 *p += params->len;
mbedAustin 11:cada08fc8a70 327
mbedAustin 11:cada08fc8a70 328 if( *p != end )
mbedAustin 11:cada08fc8a70 329 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
mbedAustin 11:cada08fc8a70 330
mbedAustin 11:cada08fc8a70 331 return( 0 );
mbedAustin 11:cada08fc8a70 332 }
mbedAustin 11:cada08fc8a70 333
mbedAustin 11:cada08fc8a70 334 int mbedtls_asn1_get_alg_null( unsigned char **p,
mbedAustin 11:cada08fc8a70 335 const unsigned char *end,
mbedAustin 11:cada08fc8a70 336 mbedtls_asn1_buf *alg )
mbedAustin 11:cada08fc8a70 337 {
mbedAustin 11:cada08fc8a70 338 int ret;
mbedAustin 11:cada08fc8a70 339 mbedtls_asn1_buf params;
mbedAustin 11:cada08fc8a70 340
mbedAustin 11:cada08fc8a70 341 memset( &params, 0, sizeof(mbedtls_asn1_buf) );
mbedAustin 11:cada08fc8a70 342
mbedAustin 11:cada08fc8a70 343 if( ( ret = mbedtls_asn1_get_alg( p, end, alg, &params ) ) != 0 )
mbedAustin 11:cada08fc8a70 344 return( ret );
mbedAustin 11:cada08fc8a70 345
mbedAustin 11:cada08fc8a70 346 if( ( params.tag != MBEDTLS_ASN1_NULL && params.tag != 0 ) || params.len != 0 )
mbedAustin 11:cada08fc8a70 347 return( MBEDTLS_ERR_ASN1_INVALID_DATA );
mbedAustin 11:cada08fc8a70 348
mbedAustin 11:cada08fc8a70 349 return( 0 );
mbedAustin 11:cada08fc8a70 350 }
mbedAustin 11:cada08fc8a70 351
mbedAustin 11:cada08fc8a70 352 void mbedtls_asn1_free_named_data( mbedtls_asn1_named_data *cur )
mbedAustin 11:cada08fc8a70 353 {
mbedAustin 11:cada08fc8a70 354 if( cur == NULL )
mbedAustin 11:cada08fc8a70 355 return;
mbedAustin 11:cada08fc8a70 356
mbedAustin 11:cada08fc8a70 357 mbedtls_free( cur->oid.p );
mbedAustin 11:cada08fc8a70 358 mbedtls_free( cur->val.p );
mbedAustin 11:cada08fc8a70 359
mbedAustin 11:cada08fc8a70 360 mbedtls_zeroize( cur, sizeof( mbedtls_asn1_named_data ) );
mbedAustin 11:cada08fc8a70 361 }
mbedAustin 11:cada08fc8a70 362
mbedAustin 11:cada08fc8a70 363 void mbedtls_asn1_free_named_data_list( mbedtls_asn1_named_data **head )
mbedAustin 11:cada08fc8a70 364 {
mbedAustin 11:cada08fc8a70 365 mbedtls_asn1_named_data *cur;
mbedAustin 11:cada08fc8a70 366
mbedAustin 11:cada08fc8a70 367 while( ( cur = *head ) != NULL )
mbedAustin 11:cada08fc8a70 368 {
mbedAustin 11:cada08fc8a70 369 *head = cur->next;
mbedAustin 11:cada08fc8a70 370 mbedtls_asn1_free_named_data( cur );
mbedAustin 11:cada08fc8a70 371 mbedtls_free( cur );
mbedAustin 11:cada08fc8a70 372 }
mbedAustin 11:cada08fc8a70 373 }
mbedAustin 11:cada08fc8a70 374
mbedAustin 11:cada08fc8a70 375 mbedtls_asn1_named_data *mbedtls_asn1_find_named_data( mbedtls_asn1_named_data *list,
mbedAustin 11:cada08fc8a70 376 const char *oid, size_t len )
mbedAustin 11:cada08fc8a70 377 {
mbedAustin 11:cada08fc8a70 378 while( list != NULL )
mbedAustin 11:cada08fc8a70 379 {
mbedAustin 11:cada08fc8a70 380 if( list->oid.len == len &&
mbedAustin 11:cada08fc8a70 381 memcmp( list->oid.p, oid, len ) == 0 )
mbedAustin 11:cada08fc8a70 382 {
mbedAustin 11:cada08fc8a70 383 break;
mbedAustin 11:cada08fc8a70 384 }
mbedAustin 11:cada08fc8a70 385
mbedAustin 11:cada08fc8a70 386 list = list->next;
mbedAustin 11:cada08fc8a70 387 }
mbedAustin 11:cada08fc8a70 388
mbedAustin 11:cada08fc8a70 389 return( list );
mbedAustin 11:cada08fc8a70 390 }
mbedAustin 11:cada08fc8a70 391
mbedAustin 11:cada08fc8a70 392 #endif /* MBEDTLS_ASN1_PARSE_C */