Nicolas Borla / Mbed OS BBR_1Ebene

BBR 1 Ebene

mbed-os/features/mbedtls/src/asn1parse.c@0:fbdae7e6d805, 2018-05-14 (annotated)

Committer:
borlanic
Date:
Mon May 14 11:29:06 2018 +0000
Revision:
0:fbdae7e6d805
BBR

Who changed what in which revision?

UserRevisionLine numberNew contents of line
borlanic 0:fbdae7e6d805 1 /*
borlanic 0:fbdae7e6d805 2 * Generic ASN.1 parsing
borlanic 0:fbdae7e6d805 3 *
borlanic 0:fbdae7e6d805 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
borlanic 0:fbdae7e6d805 5 * SPDX-License-Identifier: Apache-2.0
borlanic 0:fbdae7e6d805 6 *
borlanic 0:fbdae7e6d805 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
borlanic 0:fbdae7e6d805 8 * not use this file except in compliance with the License.
borlanic 0:fbdae7e6d805 9 * You may obtain a copy of the License at
borlanic 0:fbdae7e6d805 10 *
borlanic 0:fbdae7e6d805 11 * http://www.apache.org/licenses/LICENSE-2.0
borlanic 0:fbdae7e6d805 12 *
borlanic 0:fbdae7e6d805 13 * Unless required by applicable law or agreed to in writing, software
borlanic 0:fbdae7e6d805 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
borlanic 0:fbdae7e6d805 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
borlanic 0:fbdae7e6d805 16 * See the License for the specific language governing permissions and
borlanic 0:fbdae7e6d805 17 * limitations under the License.
borlanic 0:fbdae7e6d805 18 *
borlanic 0:fbdae7e6d805 19 * This file is part of mbed TLS (https://tls.mbed.org)
borlanic 0:fbdae7e6d805 20 */
borlanic 0:fbdae7e6d805 21
borlanic 0:fbdae7e6d805 22 #if !defined(MBEDTLS_CONFIG_FILE)
borlanic 0:fbdae7e6d805 23 #include "mbedtls/config.h"
borlanic 0:fbdae7e6d805 24 #else
borlanic 0:fbdae7e6d805 25 #include MBEDTLS_CONFIG_FILE
borlanic 0:fbdae7e6d805 26 #endif
borlanic 0:fbdae7e6d805 27
borlanic 0:fbdae7e6d805 28 #if defined(MBEDTLS_ASN1_PARSE_C)
borlanic 0:fbdae7e6d805 29
borlanic 0:fbdae7e6d805 30 #include "mbedtls/asn1.h"
borlanic 0:fbdae7e6d805 31
borlanic 0:fbdae7e6d805 32 #include <string.h>
borlanic 0:fbdae7e6d805 33
borlanic 0:fbdae7e6d805 34 #if defined(MBEDTLS_BIGNUM_C)
borlanic 0:fbdae7e6d805 35 #include "mbedtls/bignum.h"
borlanic 0:fbdae7e6d805 36 #endif
borlanic 0:fbdae7e6d805 37
borlanic 0:fbdae7e6d805 38 #if defined(MBEDTLS_PLATFORM_C)
borlanic 0:fbdae7e6d805 39 #include "mbedtls/platform.h"
borlanic 0:fbdae7e6d805 40 #else
borlanic 0:fbdae7e6d805 41 #include <stdlib.h>
borlanic 0:fbdae7e6d805 42 #define mbedtls_calloc calloc
borlanic 0:fbdae7e6d805 43 #define mbedtls_free free
borlanic 0:fbdae7e6d805 44 #endif
borlanic 0:fbdae7e6d805 45
borlanic 0:fbdae7e6d805 46 /* Implementation that should never be optimized out by the compiler */
borlanic 0:fbdae7e6d805 47 static void mbedtls_zeroize( void *v, size_t n ) {
borlanic 0:fbdae7e6d805 48 volatile unsigned char *p = (unsigned char*)v; while( n-- ) *p++ = 0;
borlanic 0:fbdae7e6d805 49 }
borlanic 0:fbdae7e6d805 50
borlanic 0:fbdae7e6d805 51 /*
borlanic 0:fbdae7e6d805 52 * ASN.1 DER decoding routines
borlanic 0:fbdae7e6d805 53 */
borlanic 0:fbdae7e6d805 54 int mbedtls_asn1_get_len( unsigned char **p,
borlanic 0:fbdae7e6d805 55 const unsigned char *end,
borlanic 0:fbdae7e6d805 56 size_t *len )
borlanic 0:fbdae7e6d805 57 {
borlanic 0:fbdae7e6d805 58 if( ( end - *p ) < 1 )
borlanic 0:fbdae7e6d805 59 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
borlanic 0:fbdae7e6d805 60
borlanic 0:fbdae7e6d805 61 if( ( **p & 0x80 ) == 0 )
borlanic 0:fbdae7e6d805 62 *len = *(*p)++;
borlanic 0:fbdae7e6d805 63 else
borlanic 0:fbdae7e6d805 64 {
borlanic 0:fbdae7e6d805 65 switch( **p & 0x7F )
borlanic 0:fbdae7e6d805 66 {
borlanic 0:fbdae7e6d805 67 case 1:
borlanic 0:fbdae7e6d805 68 if( ( end - *p ) < 2 )
borlanic 0:fbdae7e6d805 69 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
borlanic 0:fbdae7e6d805 70
borlanic 0:fbdae7e6d805 71 *len = (*p)[1];
borlanic 0:fbdae7e6d805 72 (*p) += 2;
borlanic 0:fbdae7e6d805 73 break;
borlanic 0:fbdae7e6d805 74
borlanic 0:fbdae7e6d805 75 case 2:
borlanic 0:fbdae7e6d805 76 if( ( end - *p ) < 3 )
borlanic 0:fbdae7e6d805 77 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
borlanic 0:fbdae7e6d805 78
borlanic 0:fbdae7e6d805 79 *len = ( (size_t)(*p)[1] << 8 ) | (*p)[2];
borlanic 0:fbdae7e6d805 80 (*p) += 3;
borlanic 0:fbdae7e6d805 81 break;
borlanic 0:fbdae7e6d805 82
borlanic 0:fbdae7e6d805 83 case 3:
borlanic 0:fbdae7e6d805 84 if( ( end - *p ) < 4 )
borlanic 0:fbdae7e6d805 85 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
borlanic 0:fbdae7e6d805 86
borlanic 0:fbdae7e6d805 87 *len = ( (size_t)(*p)[1] << 16 ) |
borlanic 0:fbdae7e6d805 88 ( (size_t)(*p)[2] << 8 ) | (*p)[3];
borlanic 0:fbdae7e6d805 89 (*p) += 4;
borlanic 0:fbdae7e6d805 90 break;
borlanic 0:fbdae7e6d805 91
borlanic 0:fbdae7e6d805 92 case 4:
borlanic 0:fbdae7e6d805 93 if( ( end - *p ) < 5 )
borlanic 0:fbdae7e6d805 94 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
borlanic 0:fbdae7e6d805 95
borlanic 0:fbdae7e6d805 96 *len = ( (size_t)(*p)[1] << 24 ) | ( (size_t)(*p)[2] << 16 ) |
borlanic 0:fbdae7e6d805 97 ( (size_t)(*p)[3] << 8 ) | (*p)[4];
borlanic 0:fbdae7e6d805 98 (*p) += 5;
borlanic 0:fbdae7e6d805 99 break;
borlanic 0:fbdae7e6d805 100
borlanic 0:fbdae7e6d805 101 default:
borlanic 0:fbdae7e6d805 102 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
borlanic 0:fbdae7e6d805 103 }
borlanic 0:fbdae7e6d805 104 }
borlanic 0:fbdae7e6d805 105
borlanic 0:fbdae7e6d805 106 if( *len > (size_t) ( end - *p ) )
borlanic 0:fbdae7e6d805 107 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
borlanic 0:fbdae7e6d805 108
borlanic 0:fbdae7e6d805 109 return( 0 );
borlanic 0:fbdae7e6d805 110 }
borlanic 0:fbdae7e6d805 111
borlanic 0:fbdae7e6d805 112 int mbedtls_asn1_get_tag( unsigned char **p,
borlanic 0:fbdae7e6d805 113 const unsigned char *end,
borlanic 0:fbdae7e6d805 114 size_t *len, int tag )
borlanic 0:fbdae7e6d805 115 {
borlanic 0:fbdae7e6d805 116 if( ( end - *p ) < 1 )
borlanic 0:fbdae7e6d805 117 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
borlanic 0:fbdae7e6d805 118
borlanic 0:fbdae7e6d805 119 if( **p != tag )
borlanic 0:fbdae7e6d805 120 return( MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
borlanic 0:fbdae7e6d805 121
borlanic 0:fbdae7e6d805 122 (*p)++;
borlanic 0:fbdae7e6d805 123
borlanic 0:fbdae7e6d805 124 return( mbedtls_asn1_get_len( p, end, len ) );
borlanic 0:fbdae7e6d805 125 }
borlanic 0:fbdae7e6d805 126
borlanic 0:fbdae7e6d805 127 int mbedtls_asn1_get_bool( unsigned char **p,
borlanic 0:fbdae7e6d805 128 const unsigned char *end,
borlanic 0:fbdae7e6d805 129 int *val )
borlanic 0:fbdae7e6d805 130 {
borlanic 0:fbdae7e6d805 131 int ret;
borlanic 0:fbdae7e6d805 132 size_t len;
borlanic 0:fbdae7e6d805 133
borlanic 0:fbdae7e6d805 134 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_BOOLEAN ) ) != 0 )
borlanic 0:fbdae7e6d805 135 return( ret );
borlanic 0:fbdae7e6d805 136
borlanic 0:fbdae7e6d805 137 if( len != 1 )
borlanic 0:fbdae7e6d805 138 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
borlanic 0:fbdae7e6d805 139
borlanic 0:fbdae7e6d805 140 *val = ( **p != 0 ) ? 1 : 0;
borlanic 0:fbdae7e6d805 141 (*p)++;
borlanic 0:fbdae7e6d805 142
borlanic 0:fbdae7e6d805 143 return( 0 );
borlanic 0:fbdae7e6d805 144 }
borlanic 0:fbdae7e6d805 145
borlanic 0:fbdae7e6d805 146 int mbedtls_asn1_get_int( unsigned char **p,
borlanic 0:fbdae7e6d805 147 const unsigned char *end,
borlanic 0:fbdae7e6d805 148 int *val )
borlanic 0:fbdae7e6d805 149 {
borlanic 0:fbdae7e6d805 150 int ret;
borlanic 0:fbdae7e6d805 151 size_t len;
borlanic 0:fbdae7e6d805 152
borlanic 0:fbdae7e6d805 153 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
borlanic 0:fbdae7e6d805 154 return( ret );
borlanic 0:fbdae7e6d805 155
borlanic 0:fbdae7e6d805 156 if( len == 0 || len > sizeof( int ) || ( **p & 0x80 ) != 0 )
borlanic 0:fbdae7e6d805 157 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
borlanic 0:fbdae7e6d805 158
borlanic 0:fbdae7e6d805 159 *val = 0;
borlanic 0:fbdae7e6d805 160
borlanic 0:fbdae7e6d805 161 while( len-- > 0 )
borlanic 0:fbdae7e6d805 162 {
borlanic 0:fbdae7e6d805 163 *val = ( *val << 8 ) | **p;
borlanic 0:fbdae7e6d805 164 (*p)++;
borlanic 0:fbdae7e6d805 165 }
borlanic 0:fbdae7e6d805 166
borlanic 0:fbdae7e6d805 167 return( 0 );
borlanic 0:fbdae7e6d805 168 }
borlanic 0:fbdae7e6d805 169
borlanic 0:fbdae7e6d805 170 #if defined(MBEDTLS_BIGNUM_C)
borlanic 0:fbdae7e6d805 171 int mbedtls_asn1_get_mpi( unsigned char **p,
borlanic 0:fbdae7e6d805 172 const unsigned char *end,
borlanic 0:fbdae7e6d805 173 mbedtls_mpi *X )
borlanic 0:fbdae7e6d805 174 {
borlanic 0:fbdae7e6d805 175 int ret;
borlanic 0:fbdae7e6d805 176 size_t len;
borlanic 0:fbdae7e6d805 177
borlanic 0:fbdae7e6d805 178 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
borlanic 0:fbdae7e6d805 179 return( ret );
borlanic 0:fbdae7e6d805 180
borlanic 0:fbdae7e6d805 181 ret = mbedtls_mpi_read_binary( X, *p, len );
borlanic 0:fbdae7e6d805 182
borlanic 0:fbdae7e6d805 183 *p += len;
borlanic 0:fbdae7e6d805 184
borlanic 0:fbdae7e6d805 185 return( ret );
borlanic 0:fbdae7e6d805 186 }
borlanic 0:fbdae7e6d805 187 #endif /* MBEDTLS_BIGNUM_C */
borlanic 0:fbdae7e6d805 188
borlanic 0:fbdae7e6d805 189 int mbedtls_asn1_get_bitstring( unsigned char **p, const unsigned char *end,
borlanic 0:fbdae7e6d805 190 mbedtls_asn1_bitstring *bs)
borlanic 0:fbdae7e6d805 191 {
borlanic 0:fbdae7e6d805 192 int ret;
borlanic 0:fbdae7e6d805 193
borlanic 0:fbdae7e6d805 194 /* Certificate type is a single byte bitstring */
borlanic 0:fbdae7e6d805 195 if( ( ret = mbedtls_asn1_get_tag( p, end, &bs->len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
borlanic 0:fbdae7e6d805 196 return( ret );
borlanic 0:fbdae7e6d805 197
borlanic 0:fbdae7e6d805 198 /* Check length, subtract one for actual bit string length */
borlanic 0:fbdae7e6d805 199 if( bs->len < 1 )
borlanic 0:fbdae7e6d805 200 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
borlanic 0:fbdae7e6d805 201 bs->len -= 1;
borlanic 0:fbdae7e6d805 202
borlanic 0:fbdae7e6d805 203 /* Get number of unused bits, ensure unused bits <= 7 */
borlanic 0:fbdae7e6d805 204 bs->unused_bits = **p;
borlanic 0:fbdae7e6d805 205 if( bs->unused_bits > 7 )
borlanic 0:fbdae7e6d805 206 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
borlanic 0:fbdae7e6d805 207 (*p)++;
borlanic 0:fbdae7e6d805 208
borlanic 0:fbdae7e6d805 209 /* Get actual bitstring */
borlanic 0:fbdae7e6d805 210 bs->p = *p;
borlanic 0:fbdae7e6d805 211 *p += bs->len;
borlanic 0:fbdae7e6d805 212
borlanic 0:fbdae7e6d805 213 if( *p != end )
borlanic 0:fbdae7e6d805 214 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
borlanic 0:fbdae7e6d805 215
borlanic 0:fbdae7e6d805 216 return( 0 );
borlanic 0:fbdae7e6d805 217 }
borlanic 0:fbdae7e6d805 218
borlanic 0:fbdae7e6d805 219 /*
borlanic 0:fbdae7e6d805 220 * Get a bit string without unused bits
borlanic 0:fbdae7e6d805 221 */
borlanic 0:fbdae7e6d805 222 int mbedtls_asn1_get_bitstring_null( unsigned char **p, const unsigned char *end,
borlanic 0:fbdae7e6d805 223 size_t *len )
borlanic 0:fbdae7e6d805 224 {
borlanic 0:fbdae7e6d805 225 int ret;
borlanic 0:fbdae7e6d805 226
borlanic 0:fbdae7e6d805 227 if( ( ret = mbedtls_asn1_get_tag( p, end, len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
borlanic 0:fbdae7e6d805 228 return( ret );
borlanic 0:fbdae7e6d805 229
borlanic 0:fbdae7e6d805 230 if( (*len)-- < 2 || *(*p)++ != 0 )
borlanic 0:fbdae7e6d805 231 return( MBEDTLS_ERR_ASN1_INVALID_DATA );
borlanic 0:fbdae7e6d805 232
borlanic 0:fbdae7e6d805 233 return( 0 );
borlanic 0:fbdae7e6d805 234 }
borlanic 0:fbdae7e6d805 235
borlanic 0:fbdae7e6d805 236
borlanic 0:fbdae7e6d805 237
borlanic 0:fbdae7e6d805 238 /*
borlanic 0:fbdae7e6d805 239 * Parses and splits an ASN.1 "SEQUENCE OF <tag>"
borlanic 0:fbdae7e6d805 240 */
borlanic 0:fbdae7e6d805 241 int mbedtls_asn1_get_sequence_of( unsigned char **p,
borlanic 0:fbdae7e6d805 242 const unsigned char *end,
borlanic 0:fbdae7e6d805 243 mbedtls_asn1_sequence *cur,
borlanic 0:fbdae7e6d805 244 int tag)
borlanic 0:fbdae7e6d805 245 {
borlanic 0:fbdae7e6d805 246 int ret;
borlanic 0:fbdae7e6d805 247 size_t len;
borlanic 0:fbdae7e6d805 248 mbedtls_asn1_buf *buf;
borlanic 0:fbdae7e6d805 249
borlanic 0:fbdae7e6d805 250 /* Get main sequence tag */
borlanic 0:fbdae7e6d805 251 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
borlanic 0:fbdae7e6d805 252 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
borlanic 0:fbdae7e6d805 253 return( ret );
borlanic 0:fbdae7e6d805 254
borlanic 0:fbdae7e6d805 255 if( *p + len != end )
borlanic 0:fbdae7e6d805 256 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
borlanic 0:fbdae7e6d805 257
borlanic 0:fbdae7e6d805 258 while( *p < end )
borlanic 0:fbdae7e6d805 259 {
borlanic 0:fbdae7e6d805 260 buf = &(cur->buf);
borlanic 0:fbdae7e6d805 261 buf->tag = **p;
borlanic 0:fbdae7e6d805 262
borlanic 0:fbdae7e6d805 263 if( ( ret = mbedtls_asn1_get_tag( p, end, &buf->len, tag ) ) != 0 )
borlanic 0:fbdae7e6d805 264 return( ret );
borlanic 0:fbdae7e6d805 265
borlanic 0:fbdae7e6d805 266 buf->p = *p;
borlanic 0:fbdae7e6d805 267 *p += buf->len;
borlanic 0:fbdae7e6d805 268
borlanic 0:fbdae7e6d805 269 /* Allocate and assign next pointer */
borlanic 0:fbdae7e6d805 270 if( *p < end )
borlanic 0:fbdae7e6d805 271 {
borlanic 0:fbdae7e6d805 272 cur->next = (mbedtls_asn1_sequence*)mbedtls_calloc( 1,
borlanic 0:fbdae7e6d805 273 sizeof( mbedtls_asn1_sequence ) );
borlanic 0:fbdae7e6d805 274
borlanic 0:fbdae7e6d805 275 if( cur->next == NULL )
borlanic 0:fbdae7e6d805 276 return( MBEDTLS_ERR_ASN1_ALLOC_FAILED );
borlanic 0:fbdae7e6d805 277
borlanic 0:fbdae7e6d805 278 cur = cur->next;
borlanic 0:fbdae7e6d805 279 }
borlanic 0:fbdae7e6d805 280 }
borlanic 0:fbdae7e6d805 281
borlanic 0:fbdae7e6d805 282 /* Set final sequence entry's next pointer to NULL */
borlanic 0:fbdae7e6d805 283 cur->next = NULL;
borlanic 0:fbdae7e6d805 284
borlanic 0:fbdae7e6d805 285 if( *p != end )
borlanic 0:fbdae7e6d805 286 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
borlanic 0:fbdae7e6d805 287
borlanic 0:fbdae7e6d805 288 return( 0 );
borlanic 0:fbdae7e6d805 289 }
borlanic 0:fbdae7e6d805 290
borlanic 0:fbdae7e6d805 291 int mbedtls_asn1_get_alg( unsigned char **p,
borlanic 0:fbdae7e6d805 292 const unsigned char *end,
borlanic 0:fbdae7e6d805 293 mbedtls_asn1_buf *alg, mbedtls_asn1_buf *params )
borlanic 0:fbdae7e6d805 294 {
borlanic 0:fbdae7e6d805 295 int ret;
borlanic 0:fbdae7e6d805 296 size_t len;
borlanic 0:fbdae7e6d805 297
borlanic 0:fbdae7e6d805 298 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
borlanic 0:fbdae7e6d805 299 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
borlanic 0:fbdae7e6d805 300 return( ret );
borlanic 0:fbdae7e6d805 301
borlanic 0:fbdae7e6d805 302 if( ( end - *p ) < 1 )
borlanic 0:fbdae7e6d805 303 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
borlanic 0:fbdae7e6d805 304
borlanic 0:fbdae7e6d805 305 alg->tag = **p;
borlanic 0:fbdae7e6d805 306 end = *p + len;
borlanic 0:fbdae7e6d805 307
borlanic 0:fbdae7e6d805 308 if( ( ret = mbedtls_asn1_get_tag( p, end, &alg->len, MBEDTLS_ASN1_OID ) ) != 0 )
borlanic 0:fbdae7e6d805 309 return( ret );
borlanic 0:fbdae7e6d805 310
borlanic 0:fbdae7e6d805 311 alg->p = *p;
borlanic 0:fbdae7e6d805 312 *p += alg->len;
borlanic 0:fbdae7e6d805 313
borlanic 0:fbdae7e6d805 314 if( *p == end )
borlanic 0:fbdae7e6d805 315 {
borlanic 0:fbdae7e6d805 316 mbedtls_zeroize( params, sizeof(mbedtls_asn1_buf) );
borlanic 0:fbdae7e6d805 317 return( 0 );
borlanic 0:fbdae7e6d805 318 }
borlanic 0:fbdae7e6d805 319
borlanic 0:fbdae7e6d805 320 params->tag = **p;
borlanic 0:fbdae7e6d805 321 (*p)++;
borlanic 0:fbdae7e6d805 322
borlanic 0:fbdae7e6d805 323 if( ( ret = mbedtls_asn1_get_len( p, end, &params->len ) ) != 0 )
borlanic 0:fbdae7e6d805 324 return( ret );
borlanic 0:fbdae7e6d805 325
borlanic 0:fbdae7e6d805 326 params->p = *p;
borlanic 0:fbdae7e6d805 327 *p += params->len;
borlanic 0:fbdae7e6d805 328
borlanic 0:fbdae7e6d805 329 if( *p != end )
borlanic 0:fbdae7e6d805 330 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
borlanic 0:fbdae7e6d805 331
borlanic 0:fbdae7e6d805 332 return( 0 );
borlanic 0:fbdae7e6d805 333 }
borlanic 0:fbdae7e6d805 334
borlanic 0:fbdae7e6d805 335 int mbedtls_asn1_get_alg_null( unsigned char **p,
borlanic 0:fbdae7e6d805 336 const unsigned char *end,
borlanic 0:fbdae7e6d805 337 mbedtls_asn1_buf *alg )
borlanic 0:fbdae7e6d805 338 {
borlanic 0:fbdae7e6d805 339 int ret;
borlanic 0:fbdae7e6d805 340 mbedtls_asn1_buf params;
borlanic 0:fbdae7e6d805 341
borlanic 0:fbdae7e6d805 342 memset( &params, 0, sizeof(mbedtls_asn1_buf) );
borlanic 0:fbdae7e6d805 343
borlanic 0:fbdae7e6d805 344 if( ( ret = mbedtls_asn1_get_alg( p, end, alg, &params ) ) != 0 )
borlanic 0:fbdae7e6d805 345 return( ret );
borlanic 0:fbdae7e6d805 346
borlanic 0:fbdae7e6d805 347 if( ( params.tag != MBEDTLS_ASN1_NULL && params.tag != 0 ) || params.len != 0 )
borlanic 0:fbdae7e6d805 348 return( MBEDTLS_ERR_ASN1_INVALID_DATA );
borlanic 0:fbdae7e6d805 349
borlanic 0:fbdae7e6d805 350 return( 0 );
borlanic 0:fbdae7e6d805 351 }
borlanic 0:fbdae7e6d805 352
borlanic 0:fbdae7e6d805 353 void mbedtls_asn1_free_named_data( mbedtls_asn1_named_data *cur )
borlanic 0:fbdae7e6d805 354 {
borlanic 0:fbdae7e6d805 355 if( cur == NULL )
borlanic 0:fbdae7e6d805 356 return;
borlanic 0:fbdae7e6d805 357
borlanic 0:fbdae7e6d805 358 mbedtls_free( cur->oid.p );
borlanic 0:fbdae7e6d805 359 mbedtls_free( cur->val.p );
borlanic 0:fbdae7e6d805 360
borlanic 0:fbdae7e6d805 361 mbedtls_zeroize( cur, sizeof( mbedtls_asn1_named_data ) );
borlanic 0:fbdae7e6d805 362 }
borlanic 0:fbdae7e6d805 363
borlanic 0:fbdae7e6d805 364 void mbedtls_asn1_free_named_data_list( mbedtls_asn1_named_data **head )
borlanic 0:fbdae7e6d805 365 {
borlanic 0:fbdae7e6d805 366 mbedtls_asn1_named_data *cur;
borlanic 0:fbdae7e6d805 367
borlanic 0:fbdae7e6d805 368 while( ( cur = *head ) != NULL )
borlanic 0:fbdae7e6d805 369 {
borlanic 0:fbdae7e6d805 370 *head = cur->next;
borlanic 0:fbdae7e6d805 371 mbedtls_asn1_free_named_data( cur );
borlanic 0:fbdae7e6d805 372 mbedtls_free( cur );
borlanic 0:fbdae7e6d805 373 }
borlanic 0:fbdae7e6d805 374 }
borlanic 0:fbdae7e6d805 375
borlanic 0:fbdae7e6d805 376 mbedtls_asn1_named_data *mbedtls_asn1_find_named_data( mbedtls_asn1_named_data *list,
borlanic 0:fbdae7e6d805 377 const char *oid, size_t len )
borlanic 0:fbdae7e6d805 378 {
borlanic 0:fbdae7e6d805 379 while( list != NULL )
borlanic 0:fbdae7e6d805 380 {
borlanic 0:fbdae7e6d805 381 if( list->oid.len == len &&
borlanic 0:fbdae7e6d805 382 memcmp( list->oid.p, oid, len ) == 0 )
borlanic 0:fbdae7e6d805 383 {
borlanic 0:fbdae7e6d805 384 break;
borlanic 0:fbdae7e6d805 385 }
borlanic 0:fbdae7e6d805 386
borlanic 0:fbdae7e6d805 387 list = list->next;
borlanic 0:fbdae7e6d805 388 }
borlanic 0:fbdae7e6d805 389
borlanic 0:fbdae7e6d805 390 return( list );
borlanic 0:fbdae7e6d805 391 }
borlanic 0:fbdae7e6d805 392
borlanic 0:fbdae7e6d805 393 #endif /* MBEDTLS_ASN1_PARSE_C */