Maxim nexpaq / nexpaq_dev

Preliminary main mbed library for nexpaq development

features/mbedtls/src/asn1parse.c@0:6c56fb4bc5f0, 2016-11-04 (annotated)

Committer:
nexpaq
Date:
Fri Nov 04 20:27:58 2016 +0000
Revision:
0:6c56fb4bc5f0
Moving to library for sharing updates

Who changed what in which revision?

UserRevisionLine numberNew contents of line
nexpaq 0:6c56fb4bc5f0 1 /*
nexpaq 0:6c56fb4bc5f0 2 * Generic ASN.1 parsing
nexpaq 0:6c56fb4bc5f0 3 *
nexpaq 0:6c56fb4bc5f0 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
nexpaq 0:6c56fb4bc5f0 5 * SPDX-License-Identifier: Apache-2.0
nexpaq 0:6c56fb4bc5f0 6 *
nexpaq 0:6c56fb4bc5f0 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
nexpaq 0:6c56fb4bc5f0 8 * not use this file except in compliance with the License.
nexpaq 0:6c56fb4bc5f0 9 * You may obtain a copy of the License at
nexpaq 0:6c56fb4bc5f0 10 *
nexpaq 0:6c56fb4bc5f0 11 * http://www.apache.org/licenses/LICENSE-2.0
nexpaq 0:6c56fb4bc5f0 12 *
nexpaq 0:6c56fb4bc5f0 13 * Unless required by applicable law or agreed to in writing, software
nexpaq 0:6c56fb4bc5f0 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
nexpaq 0:6c56fb4bc5f0 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
nexpaq 0:6c56fb4bc5f0 16 * See the License for the specific language governing permissions and
nexpaq 0:6c56fb4bc5f0 17 * limitations under the License.
nexpaq 0:6c56fb4bc5f0 18 *
nexpaq 0:6c56fb4bc5f0 19 * This file is part of mbed TLS (https://tls.mbed.org)
nexpaq 0:6c56fb4bc5f0 20 */
nexpaq 0:6c56fb4bc5f0 21
nexpaq 0:6c56fb4bc5f0 22 #if !defined(MBEDTLS_CONFIG_FILE)
nexpaq 0:6c56fb4bc5f0 23 #include "mbedtls/config.h"
nexpaq 0:6c56fb4bc5f0 24 #else
nexpaq 0:6c56fb4bc5f0 25 #include MBEDTLS_CONFIG_FILE
nexpaq 0:6c56fb4bc5f0 26 #endif
nexpaq 0:6c56fb4bc5f0 27
nexpaq 0:6c56fb4bc5f0 28 #if defined(MBEDTLS_ASN1_PARSE_C)
nexpaq 0:6c56fb4bc5f0 29
nexpaq 0:6c56fb4bc5f0 30 #include "mbedtls/asn1.h"
nexpaq 0:6c56fb4bc5f0 31
nexpaq 0:6c56fb4bc5f0 32 #include <string.h>
nexpaq 0:6c56fb4bc5f0 33
nexpaq 0:6c56fb4bc5f0 34 #if defined(MBEDTLS_BIGNUM_C)
nexpaq 0:6c56fb4bc5f0 35 #include "mbedtls/bignum.h"
nexpaq 0:6c56fb4bc5f0 36 #endif
nexpaq 0:6c56fb4bc5f0 37
nexpaq 0:6c56fb4bc5f0 38 #if defined(MBEDTLS_PLATFORM_C)
nexpaq 0:6c56fb4bc5f0 39 #include "mbedtls/platform.h"
nexpaq 0:6c56fb4bc5f0 40 #else
nexpaq 0:6c56fb4bc5f0 41 #include <stdlib.h>
nexpaq 0:6c56fb4bc5f0 42 #define mbedtls_calloc calloc
nexpaq 0:6c56fb4bc5f0 43 #define mbedtls_free free
nexpaq 0:6c56fb4bc5f0 44 #endif
nexpaq 0:6c56fb4bc5f0 45
nexpaq 0:6c56fb4bc5f0 46 /* Implementation that should never be optimized out by the compiler */
nexpaq 0:6c56fb4bc5f0 47 static void mbedtls_zeroize( void *v, size_t n ) {
nexpaq 0:6c56fb4bc5f0 48 volatile unsigned char *p = (unsigned char*)v; while( n-- ) *p++ = 0;
nexpaq 0:6c56fb4bc5f0 49 }
nexpaq 0:6c56fb4bc5f0 50
nexpaq 0:6c56fb4bc5f0 51 /*
nexpaq 0:6c56fb4bc5f0 52 * ASN.1 DER decoding routines
nexpaq 0:6c56fb4bc5f0 53 */
nexpaq 0:6c56fb4bc5f0 54 int mbedtls_asn1_get_len( unsigned char **p,
nexpaq 0:6c56fb4bc5f0 55 const unsigned char *end,
nexpaq 0:6c56fb4bc5f0 56 size_t *len )
nexpaq 0:6c56fb4bc5f0 57 {
nexpaq 0:6c56fb4bc5f0 58 if( ( end - *p ) < 1 )
nexpaq 0:6c56fb4bc5f0 59 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
nexpaq 0:6c56fb4bc5f0 60
nexpaq 0:6c56fb4bc5f0 61 if( ( **p & 0x80 ) == 0 )
nexpaq 0:6c56fb4bc5f0 62 *len = *(*p)++;
nexpaq 0:6c56fb4bc5f0 63 else
nexpaq 0:6c56fb4bc5f0 64 {
nexpaq 0:6c56fb4bc5f0 65 switch( **p & 0x7F )
nexpaq 0:6c56fb4bc5f0 66 {
nexpaq 0:6c56fb4bc5f0 67 case 1:
nexpaq 0:6c56fb4bc5f0 68 if( ( end - *p ) < 2 )
nexpaq 0:6c56fb4bc5f0 69 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
nexpaq 0:6c56fb4bc5f0 70
nexpaq 0:6c56fb4bc5f0 71 *len = (*p)[1];
nexpaq 0:6c56fb4bc5f0 72 (*p) += 2;
nexpaq 0:6c56fb4bc5f0 73 break;
nexpaq 0:6c56fb4bc5f0 74
nexpaq 0:6c56fb4bc5f0 75 case 2:
nexpaq 0:6c56fb4bc5f0 76 if( ( end - *p ) < 3 )
nexpaq 0:6c56fb4bc5f0 77 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
nexpaq 0:6c56fb4bc5f0 78
nexpaq 0:6c56fb4bc5f0 79 *len = ( (size_t)(*p)[1] << 8 ) | (*p)[2];
nexpaq 0:6c56fb4bc5f0 80 (*p) += 3;
nexpaq 0:6c56fb4bc5f0 81 break;
nexpaq 0:6c56fb4bc5f0 82
nexpaq 0:6c56fb4bc5f0 83 case 3:
nexpaq 0:6c56fb4bc5f0 84 if( ( end - *p ) < 4 )
nexpaq 0:6c56fb4bc5f0 85 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
nexpaq 0:6c56fb4bc5f0 86
nexpaq 0:6c56fb4bc5f0 87 *len = ( (size_t)(*p)[1] << 16 ) |
nexpaq 0:6c56fb4bc5f0 88 ( (size_t)(*p)[2] << 8 ) | (*p)[3];
nexpaq 0:6c56fb4bc5f0 89 (*p) += 4;
nexpaq 0:6c56fb4bc5f0 90 break;
nexpaq 0:6c56fb4bc5f0 91
nexpaq 0:6c56fb4bc5f0 92 case 4:
nexpaq 0:6c56fb4bc5f0 93 if( ( end - *p ) < 5 )
nexpaq 0:6c56fb4bc5f0 94 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
nexpaq 0:6c56fb4bc5f0 95
nexpaq 0:6c56fb4bc5f0 96 *len = ( (size_t)(*p)[1] << 24 ) | ( (size_t)(*p)[2] << 16 ) |
nexpaq 0:6c56fb4bc5f0 97 ( (size_t)(*p)[3] << 8 ) | (*p)[4];
nexpaq 0:6c56fb4bc5f0 98 (*p) += 5;
nexpaq 0:6c56fb4bc5f0 99 break;
nexpaq 0:6c56fb4bc5f0 100
nexpaq 0:6c56fb4bc5f0 101 default:
nexpaq 0:6c56fb4bc5f0 102 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
nexpaq 0:6c56fb4bc5f0 103 }
nexpaq 0:6c56fb4bc5f0 104 }
nexpaq 0:6c56fb4bc5f0 105
nexpaq 0:6c56fb4bc5f0 106 if( *len > (size_t) ( end - *p ) )
nexpaq 0:6c56fb4bc5f0 107 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
nexpaq 0:6c56fb4bc5f0 108
nexpaq 0:6c56fb4bc5f0 109 return( 0 );
nexpaq 0:6c56fb4bc5f0 110 }
nexpaq 0:6c56fb4bc5f0 111
nexpaq 0:6c56fb4bc5f0 112 int mbedtls_asn1_get_tag( unsigned char **p,
nexpaq 0:6c56fb4bc5f0 113 const unsigned char *end,
nexpaq 0:6c56fb4bc5f0 114 size_t *len, int tag )
nexpaq 0:6c56fb4bc5f0 115 {
nexpaq 0:6c56fb4bc5f0 116 if( ( end - *p ) < 1 )
nexpaq 0:6c56fb4bc5f0 117 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
nexpaq 0:6c56fb4bc5f0 118
nexpaq 0:6c56fb4bc5f0 119 if( **p != tag )
nexpaq 0:6c56fb4bc5f0 120 return( MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
nexpaq 0:6c56fb4bc5f0 121
nexpaq 0:6c56fb4bc5f0 122 (*p)++;
nexpaq 0:6c56fb4bc5f0 123
nexpaq 0:6c56fb4bc5f0 124 return( mbedtls_asn1_get_len( p, end, len ) );
nexpaq 0:6c56fb4bc5f0 125 }
nexpaq 0:6c56fb4bc5f0 126
nexpaq 0:6c56fb4bc5f0 127 int mbedtls_asn1_get_bool( unsigned char **p,
nexpaq 0:6c56fb4bc5f0 128 const unsigned char *end,
nexpaq 0:6c56fb4bc5f0 129 int *val )
nexpaq 0:6c56fb4bc5f0 130 {
nexpaq 0:6c56fb4bc5f0 131 int ret;
nexpaq 0:6c56fb4bc5f0 132 size_t len;
nexpaq 0:6c56fb4bc5f0 133
nexpaq 0:6c56fb4bc5f0 134 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_BOOLEAN ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 135 return( ret );
nexpaq 0:6c56fb4bc5f0 136
nexpaq 0:6c56fb4bc5f0 137 if( len != 1 )
nexpaq 0:6c56fb4bc5f0 138 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
nexpaq 0:6c56fb4bc5f0 139
nexpaq 0:6c56fb4bc5f0 140 *val = ( **p != 0 ) ? 1 : 0;
nexpaq 0:6c56fb4bc5f0 141 (*p)++;
nexpaq 0:6c56fb4bc5f0 142
nexpaq 0:6c56fb4bc5f0 143 return( 0 );
nexpaq 0:6c56fb4bc5f0 144 }
nexpaq 0:6c56fb4bc5f0 145
nexpaq 0:6c56fb4bc5f0 146 int mbedtls_asn1_get_int( unsigned char **p,
nexpaq 0:6c56fb4bc5f0 147 const unsigned char *end,
nexpaq 0:6c56fb4bc5f0 148 int *val )
nexpaq 0:6c56fb4bc5f0 149 {
nexpaq 0:6c56fb4bc5f0 150 int ret;
nexpaq 0:6c56fb4bc5f0 151 size_t len;
nexpaq 0:6c56fb4bc5f0 152
nexpaq 0:6c56fb4bc5f0 153 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 154 return( ret );
nexpaq 0:6c56fb4bc5f0 155
nexpaq 0:6c56fb4bc5f0 156 if( len > sizeof( int ) || ( **p & 0x80 ) != 0 )
nexpaq 0:6c56fb4bc5f0 157 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
nexpaq 0:6c56fb4bc5f0 158
nexpaq 0:6c56fb4bc5f0 159 *val = 0;
nexpaq 0:6c56fb4bc5f0 160
nexpaq 0:6c56fb4bc5f0 161 while( len-- > 0 )
nexpaq 0:6c56fb4bc5f0 162 {
nexpaq 0:6c56fb4bc5f0 163 *val = ( *val << 8 ) | **p;
nexpaq 0:6c56fb4bc5f0 164 (*p)++;
nexpaq 0:6c56fb4bc5f0 165 }
nexpaq 0:6c56fb4bc5f0 166
nexpaq 0:6c56fb4bc5f0 167 return( 0 );
nexpaq 0:6c56fb4bc5f0 168 }
nexpaq 0:6c56fb4bc5f0 169
nexpaq 0:6c56fb4bc5f0 170 #if defined(MBEDTLS_BIGNUM_C)
nexpaq 0:6c56fb4bc5f0 171 int mbedtls_asn1_get_mpi( unsigned char **p,
nexpaq 0:6c56fb4bc5f0 172 const unsigned char *end,
nexpaq 0:6c56fb4bc5f0 173 mbedtls_mpi *X )
nexpaq 0:6c56fb4bc5f0 174 {
nexpaq 0:6c56fb4bc5f0 175 int ret;
nexpaq 0:6c56fb4bc5f0 176 size_t len;
nexpaq 0:6c56fb4bc5f0 177
nexpaq 0:6c56fb4bc5f0 178 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 179 return( ret );
nexpaq 0:6c56fb4bc5f0 180
nexpaq 0:6c56fb4bc5f0 181 ret = mbedtls_mpi_read_binary( X, *p, len );
nexpaq 0:6c56fb4bc5f0 182
nexpaq 0:6c56fb4bc5f0 183 *p += len;
nexpaq 0:6c56fb4bc5f0 184
nexpaq 0:6c56fb4bc5f0 185 return( ret );
nexpaq 0:6c56fb4bc5f0 186 }
nexpaq 0:6c56fb4bc5f0 187 #endif /* MBEDTLS_BIGNUM_C */
nexpaq 0:6c56fb4bc5f0 188
nexpaq 0:6c56fb4bc5f0 189 int mbedtls_asn1_get_bitstring( unsigned char **p, const unsigned char *end,
nexpaq 0:6c56fb4bc5f0 190 mbedtls_asn1_bitstring *bs)
nexpaq 0:6c56fb4bc5f0 191 {
nexpaq 0:6c56fb4bc5f0 192 int ret;
nexpaq 0:6c56fb4bc5f0 193
nexpaq 0:6c56fb4bc5f0 194 /* Certificate type is a single byte bitstring */
nexpaq 0:6c56fb4bc5f0 195 if( ( ret = mbedtls_asn1_get_tag( p, end, &bs->len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 196 return( ret );
nexpaq 0:6c56fb4bc5f0 197
nexpaq 0:6c56fb4bc5f0 198 /* Check length, subtract one for actual bit string length */
nexpaq 0:6c56fb4bc5f0 199 if( bs->len < 1 )
nexpaq 0:6c56fb4bc5f0 200 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
nexpaq 0:6c56fb4bc5f0 201 bs->len -= 1;
nexpaq 0:6c56fb4bc5f0 202
nexpaq 0:6c56fb4bc5f0 203 /* Get number of unused bits, ensure unused bits <= 7 */
nexpaq 0:6c56fb4bc5f0 204 bs->unused_bits = **p;
nexpaq 0:6c56fb4bc5f0 205 if( bs->unused_bits > 7 )
nexpaq 0:6c56fb4bc5f0 206 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
nexpaq 0:6c56fb4bc5f0 207 (*p)++;
nexpaq 0:6c56fb4bc5f0 208
nexpaq 0:6c56fb4bc5f0 209 /* Get actual bitstring */
nexpaq 0:6c56fb4bc5f0 210 bs->p = *p;
nexpaq 0:6c56fb4bc5f0 211 *p += bs->len;
nexpaq 0:6c56fb4bc5f0 212
nexpaq 0:6c56fb4bc5f0 213 if( *p != end )
nexpaq 0:6c56fb4bc5f0 214 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
nexpaq 0:6c56fb4bc5f0 215
nexpaq 0:6c56fb4bc5f0 216 return( 0 );
nexpaq 0:6c56fb4bc5f0 217 }
nexpaq 0:6c56fb4bc5f0 218
nexpaq 0:6c56fb4bc5f0 219 /*
nexpaq 0:6c56fb4bc5f0 220 * Get a bit string without unused bits
nexpaq 0:6c56fb4bc5f0 221 */
nexpaq 0:6c56fb4bc5f0 222 int mbedtls_asn1_get_bitstring_null( unsigned char **p, const unsigned char *end,
nexpaq 0:6c56fb4bc5f0 223 size_t *len )
nexpaq 0:6c56fb4bc5f0 224 {
nexpaq 0:6c56fb4bc5f0 225 int ret;
nexpaq 0:6c56fb4bc5f0 226
nexpaq 0:6c56fb4bc5f0 227 if( ( ret = mbedtls_asn1_get_tag( p, end, len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 228 return( ret );
nexpaq 0:6c56fb4bc5f0 229
nexpaq 0:6c56fb4bc5f0 230 if( (*len)-- < 2 || *(*p)++ != 0 )
nexpaq 0:6c56fb4bc5f0 231 return( MBEDTLS_ERR_ASN1_INVALID_DATA );
nexpaq 0:6c56fb4bc5f0 232
nexpaq 0:6c56fb4bc5f0 233 return( 0 );
nexpaq 0:6c56fb4bc5f0 234 }
nexpaq 0:6c56fb4bc5f0 235
nexpaq 0:6c56fb4bc5f0 236
nexpaq 0:6c56fb4bc5f0 237
nexpaq 0:6c56fb4bc5f0 238 /*
nexpaq 0:6c56fb4bc5f0 239 * Parses and splits an ASN.1 "SEQUENCE OF <tag>"
nexpaq 0:6c56fb4bc5f0 240 */
nexpaq 0:6c56fb4bc5f0 241 int mbedtls_asn1_get_sequence_of( unsigned char **p,
nexpaq 0:6c56fb4bc5f0 242 const unsigned char *end,
nexpaq 0:6c56fb4bc5f0 243 mbedtls_asn1_sequence *cur,
nexpaq 0:6c56fb4bc5f0 244 int tag)
nexpaq 0:6c56fb4bc5f0 245 {
nexpaq 0:6c56fb4bc5f0 246 int ret;
nexpaq 0:6c56fb4bc5f0 247 size_t len;
nexpaq 0:6c56fb4bc5f0 248 mbedtls_asn1_buf *buf;
nexpaq 0:6c56fb4bc5f0 249
nexpaq 0:6c56fb4bc5f0 250 /* Get main sequence tag */
nexpaq 0:6c56fb4bc5f0 251 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
nexpaq 0:6c56fb4bc5f0 252 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 253 return( ret );
nexpaq 0:6c56fb4bc5f0 254
nexpaq 0:6c56fb4bc5f0 255 if( *p + len != end )
nexpaq 0:6c56fb4bc5f0 256 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
nexpaq 0:6c56fb4bc5f0 257
nexpaq 0:6c56fb4bc5f0 258 while( *p < end )
nexpaq 0:6c56fb4bc5f0 259 {
nexpaq 0:6c56fb4bc5f0 260 buf = &(cur->buf);
nexpaq 0:6c56fb4bc5f0 261 buf->tag = **p;
nexpaq 0:6c56fb4bc5f0 262
nexpaq 0:6c56fb4bc5f0 263 if( ( ret = mbedtls_asn1_get_tag( p, end, &buf->len, tag ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 264 return( ret );
nexpaq 0:6c56fb4bc5f0 265
nexpaq 0:6c56fb4bc5f0 266 buf->p = *p;
nexpaq 0:6c56fb4bc5f0 267 *p += buf->len;
nexpaq 0:6c56fb4bc5f0 268
nexpaq 0:6c56fb4bc5f0 269 /* Allocate and assign next pointer */
nexpaq 0:6c56fb4bc5f0 270 if( *p < end )
nexpaq 0:6c56fb4bc5f0 271 {
nexpaq 0:6c56fb4bc5f0 272 cur->next = (mbedtls_asn1_sequence*)mbedtls_calloc( 1,
nexpaq 0:6c56fb4bc5f0 273 sizeof( mbedtls_asn1_sequence ) );
nexpaq 0:6c56fb4bc5f0 274
nexpaq 0:6c56fb4bc5f0 275 if( cur->next == NULL )
nexpaq 0:6c56fb4bc5f0 276 return( MBEDTLS_ERR_ASN1_ALLOC_FAILED );
nexpaq 0:6c56fb4bc5f0 277
nexpaq 0:6c56fb4bc5f0 278 cur = cur->next;
nexpaq 0:6c56fb4bc5f0 279 }
nexpaq 0:6c56fb4bc5f0 280 }
nexpaq 0:6c56fb4bc5f0 281
nexpaq 0:6c56fb4bc5f0 282 /* Set final sequence entry's next pointer to NULL */
nexpaq 0:6c56fb4bc5f0 283 cur->next = NULL;
nexpaq 0:6c56fb4bc5f0 284
nexpaq 0:6c56fb4bc5f0 285 if( *p != end )
nexpaq 0:6c56fb4bc5f0 286 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
nexpaq 0:6c56fb4bc5f0 287
nexpaq 0:6c56fb4bc5f0 288 return( 0 );
nexpaq 0:6c56fb4bc5f0 289 }
nexpaq 0:6c56fb4bc5f0 290
nexpaq 0:6c56fb4bc5f0 291 int mbedtls_asn1_get_alg( unsigned char **p,
nexpaq 0:6c56fb4bc5f0 292 const unsigned char *end,
nexpaq 0:6c56fb4bc5f0 293 mbedtls_asn1_buf *alg, mbedtls_asn1_buf *params )
nexpaq 0:6c56fb4bc5f0 294 {
nexpaq 0:6c56fb4bc5f0 295 int ret;
nexpaq 0:6c56fb4bc5f0 296 size_t len;
nexpaq 0:6c56fb4bc5f0 297
nexpaq 0:6c56fb4bc5f0 298 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
nexpaq 0:6c56fb4bc5f0 299 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 300 return( ret );
nexpaq 0:6c56fb4bc5f0 301
nexpaq 0:6c56fb4bc5f0 302 if( ( end - *p ) < 1 )
nexpaq 0:6c56fb4bc5f0 303 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
nexpaq 0:6c56fb4bc5f0 304
nexpaq 0:6c56fb4bc5f0 305 alg->tag = **p;
nexpaq 0:6c56fb4bc5f0 306 end = *p + len;
nexpaq 0:6c56fb4bc5f0 307
nexpaq 0:6c56fb4bc5f0 308 if( ( ret = mbedtls_asn1_get_tag( p, end, &alg->len, MBEDTLS_ASN1_OID ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 309 return( ret );
nexpaq 0:6c56fb4bc5f0 310
nexpaq 0:6c56fb4bc5f0 311 alg->p = *p;
nexpaq 0:6c56fb4bc5f0 312 *p += alg->len;
nexpaq 0:6c56fb4bc5f0 313
nexpaq 0:6c56fb4bc5f0 314 if( *p == end )
nexpaq 0:6c56fb4bc5f0 315 {
nexpaq 0:6c56fb4bc5f0 316 mbedtls_zeroize( params, sizeof(mbedtls_asn1_buf) );
nexpaq 0:6c56fb4bc5f0 317 return( 0 );
nexpaq 0:6c56fb4bc5f0 318 }
nexpaq 0:6c56fb4bc5f0 319
nexpaq 0:6c56fb4bc5f0 320 params->tag = **p;
nexpaq 0:6c56fb4bc5f0 321 (*p)++;
nexpaq 0:6c56fb4bc5f0 322
nexpaq 0:6c56fb4bc5f0 323 if( ( ret = mbedtls_asn1_get_len( p, end, &params->len ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 324 return( ret );
nexpaq 0:6c56fb4bc5f0 325
nexpaq 0:6c56fb4bc5f0 326 params->p = *p;
nexpaq 0:6c56fb4bc5f0 327 *p += params->len;
nexpaq 0:6c56fb4bc5f0 328
nexpaq 0:6c56fb4bc5f0 329 if( *p != end )
nexpaq 0:6c56fb4bc5f0 330 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
nexpaq 0:6c56fb4bc5f0 331
nexpaq 0:6c56fb4bc5f0 332 return( 0 );
nexpaq 0:6c56fb4bc5f0 333 }
nexpaq 0:6c56fb4bc5f0 334
nexpaq 0:6c56fb4bc5f0 335 int mbedtls_asn1_get_alg_null( unsigned char **p,
nexpaq 0:6c56fb4bc5f0 336 const unsigned char *end,
nexpaq 0:6c56fb4bc5f0 337 mbedtls_asn1_buf *alg )
nexpaq 0:6c56fb4bc5f0 338 {
nexpaq 0:6c56fb4bc5f0 339 int ret;
nexpaq 0:6c56fb4bc5f0 340 mbedtls_asn1_buf params;
nexpaq 0:6c56fb4bc5f0 341
nexpaq 0:6c56fb4bc5f0 342 memset( &params, 0, sizeof(mbedtls_asn1_buf) );
nexpaq 0:6c56fb4bc5f0 343
nexpaq 0:6c56fb4bc5f0 344 if( ( ret = mbedtls_asn1_get_alg( p, end, alg, &params ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 345 return( ret );
nexpaq 0:6c56fb4bc5f0 346
nexpaq 0:6c56fb4bc5f0 347 if( ( params.tag != MBEDTLS_ASN1_NULL && params.tag != 0 ) || params.len != 0 )
nexpaq 0:6c56fb4bc5f0 348 return( MBEDTLS_ERR_ASN1_INVALID_DATA );
nexpaq 0:6c56fb4bc5f0 349
nexpaq 0:6c56fb4bc5f0 350 return( 0 );
nexpaq 0:6c56fb4bc5f0 351 }
nexpaq 0:6c56fb4bc5f0 352
nexpaq 0:6c56fb4bc5f0 353 void mbedtls_asn1_free_named_data( mbedtls_asn1_named_data *cur )
nexpaq 0:6c56fb4bc5f0 354 {
nexpaq 0:6c56fb4bc5f0 355 if( cur == NULL )
nexpaq 0:6c56fb4bc5f0 356 return;
nexpaq 0:6c56fb4bc5f0 357
nexpaq 0:6c56fb4bc5f0 358 mbedtls_free( cur->oid.p );
nexpaq 0:6c56fb4bc5f0 359 mbedtls_free( cur->val.p );
nexpaq 0:6c56fb4bc5f0 360
nexpaq 0:6c56fb4bc5f0 361 mbedtls_zeroize( cur, sizeof( mbedtls_asn1_named_data ) );
nexpaq 0:6c56fb4bc5f0 362 }
nexpaq 0:6c56fb4bc5f0 363
nexpaq 0:6c56fb4bc5f0 364 void mbedtls_asn1_free_named_data_list( mbedtls_asn1_named_data **head )
nexpaq 0:6c56fb4bc5f0 365 {
nexpaq 0:6c56fb4bc5f0 366 mbedtls_asn1_named_data *cur;
nexpaq 0:6c56fb4bc5f0 367
nexpaq 0:6c56fb4bc5f0 368 while( ( cur = *head ) != NULL )
nexpaq 0:6c56fb4bc5f0 369 {
nexpaq 0:6c56fb4bc5f0 370 *head = cur->next;
nexpaq 0:6c56fb4bc5f0 371 mbedtls_asn1_free_named_data( cur );
nexpaq 0:6c56fb4bc5f0 372 mbedtls_free( cur );
nexpaq 0:6c56fb4bc5f0 373 }
nexpaq 0:6c56fb4bc5f0 374 }
nexpaq 0:6c56fb4bc5f0 375
nexpaq 0:6c56fb4bc5f0 376 mbedtls_asn1_named_data *mbedtls_asn1_find_named_data( mbedtls_asn1_named_data *list,
nexpaq 0:6c56fb4bc5f0 377 const char *oid, size_t len )
nexpaq 0:6c56fb4bc5f0 378 {
nexpaq 0:6c56fb4bc5f0 379 while( list != NULL )
nexpaq 0:6c56fb4bc5f0 380 {
nexpaq 0:6c56fb4bc5f0 381 if( list->oid.len == len &&
nexpaq 0:6c56fb4bc5f0 382 memcmp( list->oid.p, oid, len ) == 0 )
nexpaq 0:6c56fb4bc5f0 383 {
nexpaq 0:6c56fb4bc5f0 384 break;
nexpaq 0:6c56fb4bc5f0 385 }
nexpaq 0:6c56fb4bc5f0 386
nexpaq 0:6c56fb4bc5f0 387 list = list->next;
nexpaq 0:6c56fb4bc5f0 388 }
nexpaq 0:6c56fb4bc5f0 389
nexpaq 0:6c56fb4bc5f0 390 return( list );
nexpaq 0:6c56fb4bc5f0 391 }
nexpaq 0:6c56fb4bc5f0 392
nexpaq 0:6c56fb4bc5f0 393 #endif /* MBEDTLS_ASN1_PARSE_C */