Magnificent7 / Hackathon

Includes library modifications to allow access to AIN_4 (AIN_0 / 5)

mbd_os/features/mbedtls/src/asn1parse.c@0:eafc3fd41f75, 2016-09-20 (annotated)

Committer:
bryantaylor
Date:
Tue Sep 20 21:26:12 2016 +0000
Revision:
0:eafc3fd41f75
hackathon

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bryantaylor 0:eafc3fd41f75 1 /*
bryantaylor 0:eafc3fd41f75 2 * Generic ASN.1 parsing
bryantaylor 0:eafc3fd41f75 3 *
bryantaylor 0:eafc3fd41f75 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
bryantaylor 0:eafc3fd41f75 5 * SPDX-License-Identifier: Apache-2.0
bryantaylor 0:eafc3fd41f75 6 *
bryantaylor 0:eafc3fd41f75 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
bryantaylor 0:eafc3fd41f75 8 * not use this file except in compliance with the License.
bryantaylor 0:eafc3fd41f75 9 * You may obtain a copy of the License at
bryantaylor 0:eafc3fd41f75 10 *
bryantaylor 0:eafc3fd41f75 11 * http://www.apache.org/licenses/LICENSE-2.0
bryantaylor 0:eafc3fd41f75 12 *
bryantaylor 0:eafc3fd41f75 13 * Unless required by applicable law or agreed to in writing, software
bryantaylor 0:eafc3fd41f75 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
bryantaylor 0:eafc3fd41f75 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bryantaylor 0:eafc3fd41f75 16 * See the License for the specific language governing permissions and
bryantaylor 0:eafc3fd41f75 17 * limitations under the License.
bryantaylor 0:eafc3fd41f75 18 *
bryantaylor 0:eafc3fd41f75 19 * This file is part of mbed TLS (https://tls.mbed.org)
bryantaylor 0:eafc3fd41f75 20 */
bryantaylor 0:eafc3fd41f75 21
bryantaylor 0:eafc3fd41f75 22 #if !defined(MBEDTLS_CONFIG_FILE)
bryantaylor 0:eafc3fd41f75 23 #include "mbedtls/config.h"
bryantaylor 0:eafc3fd41f75 24 #else
bryantaylor 0:eafc3fd41f75 25 #include MBEDTLS_CONFIG_FILE
bryantaylor 0:eafc3fd41f75 26 #endif
bryantaylor 0:eafc3fd41f75 27
bryantaylor 0:eafc3fd41f75 28 #if defined(MBEDTLS_ASN1_PARSE_C)
bryantaylor 0:eafc3fd41f75 29
bryantaylor 0:eafc3fd41f75 30 #include "mbedtls/asn1.h"
bryantaylor 0:eafc3fd41f75 31
bryantaylor 0:eafc3fd41f75 32 #include <string.h>
bryantaylor 0:eafc3fd41f75 33
bryantaylor 0:eafc3fd41f75 34 #if defined(MBEDTLS_BIGNUM_C)
bryantaylor 0:eafc3fd41f75 35 #include "mbedtls/bignum.h"
bryantaylor 0:eafc3fd41f75 36 #endif
bryantaylor 0:eafc3fd41f75 37
bryantaylor 0:eafc3fd41f75 38 #if defined(MBEDTLS_PLATFORM_C)
bryantaylor 0:eafc3fd41f75 39 #include "mbedtls/platform.h"
bryantaylor 0:eafc3fd41f75 40 #else
bryantaylor 0:eafc3fd41f75 41 #include <stdlib.h>
bryantaylor 0:eafc3fd41f75 42 #define mbedtls_calloc calloc
bryantaylor 0:eafc3fd41f75 43 #define mbedtls_free free
bryantaylor 0:eafc3fd41f75 44 #endif
bryantaylor 0:eafc3fd41f75 45
bryantaylor 0:eafc3fd41f75 46 /* Implementation that should never be optimized out by the compiler */
bryantaylor 0:eafc3fd41f75 47 static void mbedtls_zeroize( void *v, size_t n ) {
bryantaylor 0:eafc3fd41f75 48 volatile unsigned char *p = (unsigned char*)v; while( n-- ) *p++ = 0;
bryantaylor 0:eafc3fd41f75 49 }
bryantaylor 0:eafc3fd41f75 50
bryantaylor 0:eafc3fd41f75 51 /*
bryantaylor 0:eafc3fd41f75 52 * ASN.1 DER decoding routines
bryantaylor 0:eafc3fd41f75 53 */
bryantaylor 0:eafc3fd41f75 54 int mbedtls_asn1_get_len( unsigned char **p,
bryantaylor 0:eafc3fd41f75 55 const unsigned char *end,
bryantaylor 0:eafc3fd41f75 56 size_t *len )
bryantaylor 0:eafc3fd41f75 57 {
bryantaylor 0:eafc3fd41f75 58 if( ( end - *p ) < 1 )
bryantaylor 0:eafc3fd41f75 59 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
bryantaylor 0:eafc3fd41f75 60
bryantaylor 0:eafc3fd41f75 61 if( ( **p & 0x80 ) == 0 )
bryantaylor 0:eafc3fd41f75 62 *len = *(*p)++;
bryantaylor 0:eafc3fd41f75 63 else
bryantaylor 0:eafc3fd41f75 64 {
bryantaylor 0:eafc3fd41f75 65 switch( **p & 0x7F )
bryantaylor 0:eafc3fd41f75 66 {
bryantaylor 0:eafc3fd41f75 67 case 1:
bryantaylor 0:eafc3fd41f75 68 if( ( end - *p ) < 2 )
bryantaylor 0:eafc3fd41f75 69 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
bryantaylor 0:eafc3fd41f75 70
bryantaylor 0:eafc3fd41f75 71 *len = (*p)[1];
bryantaylor 0:eafc3fd41f75 72 (*p) += 2;
bryantaylor 0:eafc3fd41f75 73 break;
bryantaylor 0:eafc3fd41f75 74
bryantaylor 0:eafc3fd41f75 75 case 2:
bryantaylor 0:eafc3fd41f75 76 if( ( end - *p ) < 3 )
bryantaylor 0:eafc3fd41f75 77 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
bryantaylor 0:eafc3fd41f75 78
bryantaylor 0:eafc3fd41f75 79 *len = ( (size_t)(*p)[1] << 8 ) | (*p)[2];
bryantaylor 0:eafc3fd41f75 80 (*p) += 3;
bryantaylor 0:eafc3fd41f75 81 break;
bryantaylor 0:eafc3fd41f75 82
bryantaylor 0:eafc3fd41f75 83 case 3:
bryantaylor 0:eafc3fd41f75 84 if( ( end - *p ) < 4 )
bryantaylor 0:eafc3fd41f75 85 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
bryantaylor 0:eafc3fd41f75 86
bryantaylor 0:eafc3fd41f75 87 *len = ( (size_t)(*p)[1] << 16 ) |
bryantaylor 0:eafc3fd41f75 88 ( (size_t)(*p)[2] << 8 ) | (*p)[3];
bryantaylor 0:eafc3fd41f75 89 (*p) += 4;
bryantaylor 0:eafc3fd41f75 90 break;
bryantaylor 0:eafc3fd41f75 91
bryantaylor 0:eafc3fd41f75 92 case 4:
bryantaylor 0:eafc3fd41f75 93 if( ( end - *p ) < 5 )
bryantaylor 0:eafc3fd41f75 94 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
bryantaylor 0:eafc3fd41f75 95
bryantaylor 0:eafc3fd41f75 96 *len = ( (size_t)(*p)[1] << 24 ) | ( (size_t)(*p)[2] << 16 ) |
bryantaylor 0:eafc3fd41f75 97 ( (size_t)(*p)[3] << 8 ) | (*p)[4];
bryantaylor 0:eafc3fd41f75 98 (*p) += 5;
bryantaylor 0:eafc3fd41f75 99 break;
bryantaylor 0:eafc3fd41f75 100
bryantaylor 0:eafc3fd41f75 101 default:
bryantaylor 0:eafc3fd41f75 102 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
bryantaylor 0:eafc3fd41f75 103 }
bryantaylor 0:eafc3fd41f75 104 }
bryantaylor 0:eafc3fd41f75 105
bryantaylor 0:eafc3fd41f75 106 if( *len > (size_t) ( end - *p ) )
bryantaylor 0:eafc3fd41f75 107 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
bryantaylor 0:eafc3fd41f75 108
bryantaylor 0:eafc3fd41f75 109 return( 0 );
bryantaylor 0:eafc3fd41f75 110 }
bryantaylor 0:eafc3fd41f75 111
bryantaylor 0:eafc3fd41f75 112 int mbedtls_asn1_get_tag( unsigned char **p,
bryantaylor 0:eafc3fd41f75 113 const unsigned char *end,
bryantaylor 0:eafc3fd41f75 114 size_t *len, int tag )
bryantaylor 0:eafc3fd41f75 115 {
bryantaylor 0:eafc3fd41f75 116 if( ( end - *p ) < 1 )
bryantaylor 0:eafc3fd41f75 117 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
bryantaylor 0:eafc3fd41f75 118
bryantaylor 0:eafc3fd41f75 119 if( **p != tag )
bryantaylor 0:eafc3fd41f75 120 return( MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
bryantaylor 0:eafc3fd41f75 121
bryantaylor 0:eafc3fd41f75 122 (*p)++;
bryantaylor 0:eafc3fd41f75 123
bryantaylor 0:eafc3fd41f75 124 return( mbedtls_asn1_get_len( p, end, len ) );
bryantaylor 0:eafc3fd41f75 125 }
bryantaylor 0:eafc3fd41f75 126
bryantaylor 0:eafc3fd41f75 127 int mbedtls_asn1_get_bool( unsigned char **p,
bryantaylor 0:eafc3fd41f75 128 const unsigned char *end,
bryantaylor 0:eafc3fd41f75 129 int *val )
bryantaylor 0:eafc3fd41f75 130 {
bryantaylor 0:eafc3fd41f75 131 int ret;
bryantaylor 0:eafc3fd41f75 132 size_t len;
bryantaylor 0:eafc3fd41f75 133
bryantaylor 0:eafc3fd41f75 134 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_BOOLEAN ) ) != 0 )
bryantaylor 0:eafc3fd41f75 135 return( ret );
bryantaylor 0:eafc3fd41f75 136
bryantaylor 0:eafc3fd41f75 137 if( len != 1 )
bryantaylor 0:eafc3fd41f75 138 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
bryantaylor 0:eafc3fd41f75 139
bryantaylor 0:eafc3fd41f75 140 *val = ( **p != 0 ) ? 1 : 0;
bryantaylor 0:eafc3fd41f75 141 (*p)++;
bryantaylor 0:eafc3fd41f75 142
bryantaylor 0:eafc3fd41f75 143 return( 0 );
bryantaylor 0:eafc3fd41f75 144 }
bryantaylor 0:eafc3fd41f75 145
bryantaylor 0:eafc3fd41f75 146 int mbedtls_asn1_get_int( unsigned char **p,
bryantaylor 0:eafc3fd41f75 147 const unsigned char *end,
bryantaylor 0:eafc3fd41f75 148 int *val )
bryantaylor 0:eafc3fd41f75 149 {
bryantaylor 0:eafc3fd41f75 150 int ret;
bryantaylor 0:eafc3fd41f75 151 size_t len;
bryantaylor 0:eafc3fd41f75 152
bryantaylor 0:eafc3fd41f75 153 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
bryantaylor 0:eafc3fd41f75 154 return( ret );
bryantaylor 0:eafc3fd41f75 155
bryantaylor 0:eafc3fd41f75 156 if( len > sizeof( int ) || ( **p & 0x80 ) != 0 )
bryantaylor 0:eafc3fd41f75 157 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
bryantaylor 0:eafc3fd41f75 158
bryantaylor 0:eafc3fd41f75 159 *val = 0;
bryantaylor 0:eafc3fd41f75 160
bryantaylor 0:eafc3fd41f75 161 while( len-- > 0 )
bryantaylor 0:eafc3fd41f75 162 {
bryantaylor 0:eafc3fd41f75 163 *val = ( *val << 8 ) | **p;
bryantaylor 0:eafc3fd41f75 164 (*p)++;
bryantaylor 0:eafc3fd41f75 165 }
bryantaylor 0:eafc3fd41f75 166
bryantaylor 0:eafc3fd41f75 167 return( 0 );
bryantaylor 0:eafc3fd41f75 168 }
bryantaylor 0:eafc3fd41f75 169
bryantaylor 0:eafc3fd41f75 170 #if defined(MBEDTLS_BIGNUM_C)
bryantaylor 0:eafc3fd41f75 171 int mbedtls_asn1_get_mpi( unsigned char **p,
bryantaylor 0:eafc3fd41f75 172 const unsigned char *end,
bryantaylor 0:eafc3fd41f75 173 mbedtls_mpi *X )
bryantaylor 0:eafc3fd41f75 174 {
bryantaylor 0:eafc3fd41f75 175 int ret;
bryantaylor 0:eafc3fd41f75 176 size_t len;
bryantaylor 0:eafc3fd41f75 177
bryantaylor 0:eafc3fd41f75 178 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
bryantaylor 0:eafc3fd41f75 179 return( ret );
bryantaylor 0:eafc3fd41f75 180
bryantaylor 0:eafc3fd41f75 181 ret = mbedtls_mpi_read_binary( X, *p, len );
bryantaylor 0:eafc3fd41f75 182
bryantaylor 0:eafc3fd41f75 183 *p += len;
bryantaylor 0:eafc3fd41f75 184
bryantaylor 0:eafc3fd41f75 185 return( ret );
bryantaylor 0:eafc3fd41f75 186 }
bryantaylor 0:eafc3fd41f75 187 #endif /* MBEDTLS_BIGNUM_C */
bryantaylor 0:eafc3fd41f75 188
bryantaylor 0:eafc3fd41f75 189 int mbedtls_asn1_get_bitstring( unsigned char **p, const unsigned char *end,
bryantaylor 0:eafc3fd41f75 190 mbedtls_asn1_bitstring *bs)
bryantaylor 0:eafc3fd41f75 191 {
bryantaylor 0:eafc3fd41f75 192 int ret;
bryantaylor 0:eafc3fd41f75 193
bryantaylor 0:eafc3fd41f75 194 /* Certificate type is a single byte bitstring */
bryantaylor 0:eafc3fd41f75 195 if( ( ret = mbedtls_asn1_get_tag( p, end, &bs->len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
bryantaylor 0:eafc3fd41f75 196 return( ret );
bryantaylor 0:eafc3fd41f75 197
bryantaylor 0:eafc3fd41f75 198 /* Check length, subtract one for actual bit string length */
bryantaylor 0:eafc3fd41f75 199 if( bs->len < 1 )
bryantaylor 0:eafc3fd41f75 200 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
bryantaylor 0:eafc3fd41f75 201 bs->len -= 1;
bryantaylor 0:eafc3fd41f75 202
bryantaylor 0:eafc3fd41f75 203 /* Get number of unused bits, ensure unused bits <= 7 */
bryantaylor 0:eafc3fd41f75 204 bs->unused_bits = **p;
bryantaylor 0:eafc3fd41f75 205 if( bs->unused_bits > 7 )
bryantaylor 0:eafc3fd41f75 206 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
bryantaylor 0:eafc3fd41f75 207 (*p)++;
bryantaylor 0:eafc3fd41f75 208
bryantaylor 0:eafc3fd41f75 209 /* Get actual bitstring */
bryantaylor 0:eafc3fd41f75 210 bs->p = *p;
bryantaylor 0:eafc3fd41f75 211 *p += bs->len;
bryantaylor 0:eafc3fd41f75 212
bryantaylor 0:eafc3fd41f75 213 if( *p != end )
bryantaylor 0:eafc3fd41f75 214 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
bryantaylor 0:eafc3fd41f75 215
bryantaylor 0:eafc3fd41f75 216 return( 0 );
bryantaylor 0:eafc3fd41f75 217 }
bryantaylor 0:eafc3fd41f75 218
bryantaylor 0:eafc3fd41f75 219 /*
bryantaylor 0:eafc3fd41f75 220 * Get a bit string without unused bits
bryantaylor 0:eafc3fd41f75 221 */
bryantaylor 0:eafc3fd41f75 222 int mbedtls_asn1_get_bitstring_null( unsigned char **p, const unsigned char *end,
bryantaylor 0:eafc3fd41f75 223 size_t *len )
bryantaylor 0:eafc3fd41f75 224 {
bryantaylor 0:eafc3fd41f75 225 int ret;
bryantaylor 0:eafc3fd41f75 226
bryantaylor 0:eafc3fd41f75 227 if( ( ret = mbedtls_asn1_get_tag( p, end, len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
bryantaylor 0:eafc3fd41f75 228 return( ret );
bryantaylor 0:eafc3fd41f75 229
bryantaylor 0:eafc3fd41f75 230 if( (*len)-- < 2 || *(*p)++ != 0 )
bryantaylor 0:eafc3fd41f75 231 return( MBEDTLS_ERR_ASN1_INVALID_DATA );
bryantaylor 0:eafc3fd41f75 232
bryantaylor 0:eafc3fd41f75 233 return( 0 );
bryantaylor 0:eafc3fd41f75 234 }
bryantaylor 0:eafc3fd41f75 235
bryantaylor 0:eafc3fd41f75 236
bryantaylor 0:eafc3fd41f75 237
bryantaylor 0:eafc3fd41f75 238 /*
bryantaylor 0:eafc3fd41f75 239 * Parses and splits an ASN.1 "SEQUENCE OF <tag>"
bryantaylor 0:eafc3fd41f75 240 */
bryantaylor 0:eafc3fd41f75 241 int mbedtls_asn1_get_sequence_of( unsigned char **p,
bryantaylor 0:eafc3fd41f75 242 const unsigned char *end,
bryantaylor 0:eafc3fd41f75 243 mbedtls_asn1_sequence *cur,
bryantaylor 0:eafc3fd41f75 244 int tag)
bryantaylor 0:eafc3fd41f75 245 {
bryantaylor 0:eafc3fd41f75 246 int ret;
bryantaylor 0:eafc3fd41f75 247 size_t len;
bryantaylor 0:eafc3fd41f75 248 mbedtls_asn1_buf *buf;
bryantaylor 0:eafc3fd41f75 249
bryantaylor 0:eafc3fd41f75 250 /* Get main sequence tag */
bryantaylor 0:eafc3fd41f75 251 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
bryantaylor 0:eafc3fd41f75 252 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
bryantaylor 0:eafc3fd41f75 253 return( ret );
bryantaylor 0:eafc3fd41f75 254
bryantaylor 0:eafc3fd41f75 255 if( *p + len != end )
bryantaylor 0:eafc3fd41f75 256 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
bryantaylor 0:eafc3fd41f75 257
bryantaylor 0:eafc3fd41f75 258 while( *p < end )
bryantaylor 0:eafc3fd41f75 259 {
bryantaylor 0:eafc3fd41f75 260 buf = &(cur->buf);
bryantaylor 0:eafc3fd41f75 261 buf->tag = **p;
bryantaylor 0:eafc3fd41f75 262
bryantaylor 0:eafc3fd41f75 263 if( ( ret = mbedtls_asn1_get_tag( p, end, &buf->len, tag ) ) != 0 )
bryantaylor 0:eafc3fd41f75 264 return( ret );
bryantaylor 0:eafc3fd41f75 265
bryantaylor 0:eafc3fd41f75 266 buf->p = *p;
bryantaylor 0:eafc3fd41f75 267 *p += buf->len;
bryantaylor 0:eafc3fd41f75 268
bryantaylor 0:eafc3fd41f75 269 /* Allocate and assign next pointer */
bryantaylor 0:eafc3fd41f75 270 if( *p < end )
bryantaylor 0:eafc3fd41f75 271 {
bryantaylor 0:eafc3fd41f75 272 cur->next = (mbedtls_asn1_sequence*)mbedtls_calloc( 1,
bryantaylor 0:eafc3fd41f75 273 sizeof( mbedtls_asn1_sequence ) );
bryantaylor 0:eafc3fd41f75 274
bryantaylor 0:eafc3fd41f75 275 if( cur->next == NULL )
bryantaylor 0:eafc3fd41f75 276 return( MBEDTLS_ERR_ASN1_ALLOC_FAILED );
bryantaylor 0:eafc3fd41f75 277
bryantaylor 0:eafc3fd41f75 278 cur = cur->next;
bryantaylor 0:eafc3fd41f75 279 }
bryantaylor 0:eafc3fd41f75 280 }
bryantaylor 0:eafc3fd41f75 281
bryantaylor 0:eafc3fd41f75 282 /* Set final sequence entry's next pointer to NULL */
bryantaylor 0:eafc3fd41f75 283 cur->next = NULL;
bryantaylor 0:eafc3fd41f75 284
bryantaylor 0:eafc3fd41f75 285 if( *p != end )
bryantaylor 0:eafc3fd41f75 286 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
bryantaylor 0:eafc3fd41f75 287
bryantaylor 0:eafc3fd41f75 288 return( 0 );
bryantaylor 0:eafc3fd41f75 289 }
bryantaylor 0:eafc3fd41f75 290
bryantaylor 0:eafc3fd41f75 291 int mbedtls_asn1_get_alg( unsigned char **p,
bryantaylor 0:eafc3fd41f75 292 const unsigned char *end,
bryantaylor 0:eafc3fd41f75 293 mbedtls_asn1_buf *alg, mbedtls_asn1_buf *params )
bryantaylor 0:eafc3fd41f75 294 {
bryantaylor 0:eafc3fd41f75 295 int ret;
bryantaylor 0:eafc3fd41f75 296 size_t len;
bryantaylor 0:eafc3fd41f75 297
bryantaylor 0:eafc3fd41f75 298 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
bryantaylor 0:eafc3fd41f75 299 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
bryantaylor 0:eafc3fd41f75 300 return( ret );
bryantaylor 0:eafc3fd41f75 301
bryantaylor 0:eafc3fd41f75 302 if( ( end - *p ) < 1 )
bryantaylor 0:eafc3fd41f75 303 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
bryantaylor 0:eafc3fd41f75 304
bryantaylor 0:eafc3fd41f75 305 alg->tag = **p;
bryantaylor 0:eafc3fd41f75 306 end = *p + len;
bryantaylor 0:eafc3fd41f75 307
bryantaylor 0:eafc3fd41f75 308 if( ( ret = mbedtls_asn1_get_tag( p, end, &alg->len, MBEDTLS_ASN1_OID ) ) != 0 )
bryantaylor 0:eafc3fd41f75 309 return( ret );
bryantaylor 0:eafc3fd41f75 310
bryantaylor 0:eafc3fd41f75 311 alg->p = *p;
bryantaylor 0:eafc3fd41f75 312 *p += alg->len;
bryantaylor 0:eafc3fd41f75 313
bryantaylor 0:eafc3fd41f75 314 if( *p == end )
bryantaylor 0:eafc3fd41f75 315 {
bryantaylor 0:eafc3fd41f75 316 mbedtls_zeroize( params, sizeof(mbedtls_asn1_buf) );
bryantaylor 0:eafc3fd41f75 317 return( 0 );
bryantaylor 0:eafc3fd41f75 318 }
bryantaylor 0:eafc3fd41f75 319
bryantaylor 0:eafc3fd41f75 320 params->tag = **p;
bryantaylor 0:eafc3fd41f75 321 (*p)++;
bryantaylor 0:eafc3fd41f75 322
bryantaylor 0:eafc3fd41f75 323 if( ( ret = mbedtls_asn1_get_len( p, end, &params->len ) ) != 0 )
bryantaylor 0:eafc3fd41f75 324 return( ret );
bryantaylor 0:eafc3fd41f75 325
bryantaylor 0:eafc3fd41f75 326 params->p = *p;
bryantaylor 0:eafc3fd41f75 327 *p += params->len;
bryantaylor 0:eafc3fd41f75 328
bryantaylor 0:eafc3fd41f75 329 if( *p != end )
bryantaylor 0:eafc3fd41f75 330 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
bryantaylor 0:eafc3fd41f75 331
bryantaylor 0:eafc3fd41f75 332 return( 0 );
bryantaylor 0:eafc3fd41f75 333 }
bryantaylor 0:eafc3fd41f75 334
bryantaylor 0:eafc3fd41f75 335 int mbedtls_asn1_get_alg_null( unsigned char **p,
bryantaylor 0:eafc3fd41f75 336 const unsigned char *end,
bryantaylor 0:eafc3fd41f75 337 mbedtls_asn1_buf *alg )
bryantaylor 0:eafc3fd41f75 338 {
bryantaylor 0:eafc3fd41f75 339 int ret;
bryantaylor 0:eafc3fd41f75 340 mbedtls_asn1_buf params;
bryantaylor 0:eafc3fd41f75 341
bryantaylor 0:eafc3fd41f75 342 memset( &params, 0, sizeof(mbedtls_asn1_buf) );
bryantaylor 0:eafc3fd41f75 343
bryantaylor 0:eafc3fd41f75 344 if( ( ret = mbedtls_asn1_get_alg( p, end, alg, &params ) ) != 0 )
bryantaylor 0:eafc3fd41f75 345 return( ret );
bryantaylor 0:eafc3fd41f75 346
bryantaylor 0:eafc3fd41f75 347 if( ( params.tag != MBEDTLS_ASN1_NULL && params.tag != 0 ) || params.len != 0 )
bryantaylor 0:eafc3fd41f75 348 return( MBEDTLS_ERR_ASN1_INVALID_DATA );
bryantaylor 0:eafc3fd41f75 349
bryantaylor 0:eafc3fd41f75 350 return( 0 );
bryantaylor 0:eafc3fd41f75 351 }
bryantaylor 0:eafc3fd41f75 352
bryantaylor 0:eafc3fd41f75 353 void mbedtls_asn1_free_named_data( mbedtls_asn1_named_data *cur )
bryantaylor 0:eafc3fd41f75 354 {
bryantaylor 0:eafc3fd41f75 355 if( cur == NULL )
bryantaylor 0:eafc3fd41f75 356 return;
bryantaylor 0:eafc3fd41f75 357
bryantaylor 0:eafc3fd41f75 358 mbedtls_free( cur->oid.p );
bryantaylor 0:eafc3fd41f75 359 mbedtls_free( cur->val.p );
bryantaylor 0:eafc3fd41f75 360
bryantaylor 0:eafc3fd41f75 361 mbedtls_zeroize( cur, sizeof( mbedtls_asn1_named_data ) );
bryantaylor 0:eafc3fd41f75 362 }
bryantaylor 0:eafc3fd41f75 363
bryantaylor 0:eafc3fd41f75 364 void mbedtls_asn1_free_named_data_list( mbedtls_asn1_named_data **head )
bryantaylor 0:eafc3fd41f75 365 {
bryantaylor 0:eafc3fd41f75 366 mbedtls_asn1_named_data *cur;
bryantaylor 0:eafc3fd41f75 367
bryantaylor 0:eafc3fd41f75 368 while( ( cur = *head ) != NULL )
bryantaylor 0:eafc3fd41f75 369 {
bryantaylor 0:eafc3fd41f75 370 *head = cur->next;
bryantaylor 0:eafc3fd41f75 371 mbedtls_asn1_free_named_data( cur );
bryantaylor 0:eafc3fd41f75 372 mbedtls_free( cur );
bryantaylor 0:eafc3fd41f75 373 }
bryantaylor 0:eafc3fd41f75 374 }
bryantaylor 0:eafc3fd41f75 375
bryantaylor 0:eafc3fd41f75 376 mbedtls_asn1_named_data *mbedtls_asn1_find_named_data( mbedtls_asn1_named_data *list,
bryantaylor 0:eafc3fd41f75 377 const char *oid, size_t len )
bryantaylor 0:eafc3fd41f75 378 {
bryantaylor 0:eafc3fd41f75 379 while( list != NULL )
bryantaylor 0:eafc3fd41f75 380 {
bryantaylor 0:eafc3fd41f75 381 if( list->oid.len == len &&
bryantaylor 0:eafc3fd41f75 382 memcmp( list->oid.p, oid, len ) == 0 )
bryantaylor 0:eafc3fd41f75 383 {
bryantaylor 0:eafc3fd41f75 384 break;
bryantaylor 0:eafc3fd41f75 385 }
bryantaylor 0:eafc3fd41f75 386
bryantaylor 0:eafc3fd41f75 387 list = list->next;
bryantaylor 0:eafc3fd41f75 388 }
bryantaylor 0:eafc3fd41f75 389
bryantaylor 0:eafc3fd41f75 390 return( list );
bryantaylor 0:eafc3fd41f75 391 }
bryantaylor 0:eafc3fd41f75 392
bryantaylor 0:eafc3fd41f75 393 #endif /* MBEDTLS_ASN1_PARSE_C */