Eric Tsai / mbedtls

Modified mbed TLS headers for AES functionality only to reduce build size

Dependents:   BLE_Gateway_Linker_fix BLE_Gateway

Fork of mbedtls by sandbox

source/asn1parse.c@5:f09f5ed830ca, 2017-07-10 (annotated)

Committer:
electronichamsters
Date:
Mon Jul 10 04:00:25 2017 +0000
Revision:
5:f09f5ed830ca
Parent:
1:24750b9ad5ef 
working gateway

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Christopher Haster 1:24750b9ad5ef 1 /*
Christopher Haster 1:24750b9ad5ef 2 * Generic ASN.1 parsing
Christopher Haster 1:24750b9ad5ef 3 *
Christopher Haster 1:24750b9ad5ef 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
Christopher Haster 1:24750b9ad5ef 5 * SPDX-License-Identifier: Apache-2.0
Christopher Haster 1:24750b9ad5ef 6 *
Christopher Haster 1:24750b9ad5ef 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
Christopher Haster 1:24750b9ad5ef 8 * not use this file except in compliance with the License.
Christopher Haster 1:24750b9ad5ef 9 * You may obtain a copy of the License at
Christopher Haster 1:24750b9ad5ef 10 *
Christopher Haster 1:24750b9ad5ef 11 * http://www.apache.org/licenses/LICENSE-2.0
Christopher Haster 1:24750b9ad5ef 12 *
Christopher Haster 1:24750b9ad5ef 13 * Unless required by applicable law or agreed to in writing, software
Christopher Haster 1:24750b9ad5ef 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
Christopher Haster 1:24750b9ad5ef 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Christopher Haster 1:24750b9ad5ef 16 * See the License for the specific language governing permissions and
Christopher Haster 1:24750b9ad5ef 17 * limitations under the License.
Christopher Haster 1:24750b9ad5ef 18 *
Christopher Haster 1:24750b9ad5ef 19 * This file is part of mbed TLS (https://tls.mbed.org)
Christopher Haster 1:24750b9ad5ef 20 */
Christopher Haster 1:24750b9ad5ef 21
Christopher Haster 1:24750b9ad5ef 22 #if !defined(MBEDTLS_CONFIG_FILE)
Christopher Haster 1:24750b9ad5ef 23 #include "mbedtls/config.h"
Christopher Haster 1:24750b9ad5ef 24 #else
Christopher Haster 1:24750b9ad5ef 25 #include MBEDTLS_CONFIG_FILE
Christopher Haster 1:24750b9ad5ef 26 #endif
Christopher Haster 1:24750b9ad5ef 27
Christopher Haster 1:24750b9ad5ef 28 #if defined(MBEDTLS_ASN1_PARSE_C)
Christopher Haster 1:24750b9ad5ef 29
Christopher Haster 1:24750b9ad5ef 30 #include "mbedtls/asn1.h"
Christopher Haster 1:24750b9ad5ef 31
Christopher Haster 1:24750b9ad5ef 32 #include <string.h>
Christopher Haster 1:24750b9ad5ef 33
Christopher Haster 1:24750b9ad5ef 34 #if defined(MBEDTLS_BIGNUM_C)
Christopher Haster 1:24750b9ad5ef 35 #include "mbedtls/bignum.h"
Christopher Haster 1:24750b9ad5ef 36 #endif
Christopher Haster 1:24750b9ad5ef 37
Christopher Haster 1:24750b9ad5ef 38 #if defined(MBEDTLS_PLATFORM_C)
Christopher Haster 1:24750b9ad5ef 39 #include "mbedtls/platform.h"
Christopher Haster 1:24750b9ad5ef 40 #else
Christopher Haster 1:24750b9ad5ef 41 #include <stdlib.h>
Christopher Haster 1:24750b9ad5ef 42 #define mbedtls_calloc calloc
Christopher Haster 1:24750b9ad5ef 43 #define mbedtls_free free
Christopher Haster 1:24750b9ad5ef 44 #endif
Christopher Haster 1:24750b9ad5ef 45
Christopher Haster 1:24750b9ad5ef 46 /* Implementation that should never be optimized out by the compiler */
Christopher Haster 1:24750b9ad5ef 47 static void mbedtls_zeroize( void *v, size_t n ) {
Christopher Haster 1:24750b9ad5ef 48 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
Christopher Haster 1:24750b9ad5ef 49 }
Christopher Haster 1:24750b9ad5ef 50
Christopher Haster 1:24750b9ad5ef 51 /*
Christopher Haster 1:24750b9ad5ef 52 * ASN.1 DER decoding routines
Christopher Haster 1:24750b9ad5ef 53 */
Christopher Haster 1:24750b9ad5ef 54 int mbedtls_asn1_get_len( unsigned char **p,
Christopher Haster 1:24750b9ad5ef 55 const unsigned char *end,
Christopher Haster 1:24750b9ad5ef 56 size_t *len )
Christopher Haster 1:24750b9ad5ef 57 {
Christopher Haster 1:24750b9ad5ef 58 if( ( end - *p ) < 1 )
Christopher Haster 1:24750b9ad5ef 59 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
Christopher Haster 1:24750b9ad5ef 60
Christopher Haster 1:24750b9ad5ef 61 if( ( **p & 0x80 ) == 0 )
Christopher Haster 1:24750b9ad5ef 62 *len = *(*p)++;
Christopher Haster 1:24750b9ad5ef 63 else
Christopher Haster 1:24750b9ad5ef 64 {
Christopher Haster 1:24750b9ad5ef 65 switch( **p & 0x7F )
Christopher Haster 1:24750b9ad5ef 66 {
Christopher Haster 1:24750b9ad5ef 67 case 1:
Christopher Haster 1:24750b9ad5ef 68 if( ( end - *p ) < 2 )
Christopher Haster 1:24750b9ad5ef 69 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
Christopher Haster 1:24750b9ad5ef 70
Christopher Haster 1:24750b9ad5ef 71 *len = (*p)[1];
Christopher Haster 1:24750b9ad5ef 72 (*p) += 2;
Christopher Haster 1:24750b9ad5ef 73 break;
Christopher Haster 1:24750b9ad5ef 74
Christopher Haster 1:24750b9ad5ef 75 case 2:
Christopher Haster 1:24750b9ad5ef 76 if( ( end - *p ) < 3 )
Christopher Haster 1:24750b9ad5ef 77 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
Christopher Haster 1:24750b9ad5ef 78
Christopher Haster 1:24750b9ad5ef 79 *len = ( (size_t)(*p)[1] << 8 ) | (*p)[2];
Christopher Haster 1:24750b9ad5ef 80 (*p) += 3;
Christopher Haster 1:24750b9ad5ef 81 break;
Christopher Haster 1:24750b9ad5ef 82
Christopher Haster 1:24750b9ad5ef 83 case 3:
Christopher Haster 1:24750b9ad5ef 84 if( ( end - *p ) < 4 )
Christopher Haster 1:24750b9ad5ef 85 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
Christopher Haster 1:24750b9ad5ef 86
Christopher Haster 1:24750b9ad5ef 87 *len = ( (size_t)(*p)[1] << 16 ) |
Christopher Haster 1:24750b9ad5ef 88 ( (size_t)(*p)[2] << 8 ) | (*p)[3];
Christopher Haster 1:24750b9ad5ef 89 (*p) += 4;
Christopher Haster 1:24750b9ad5ef 90 break;
Christopher Haster 1:24750b9ad5ef 91
Christopher Haster 1:24750b9ad5ef 92 case 4:
Christopher Haster 1:24750b9ad5ef 93 if( ( end - *p ) < 5 )
Christopher Haster 1:24750b9ad5ef 94 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
Christopher Haster 1:24750b9ad5ef 95
Christopher Haster 1:24750b9ad5ef 96 *len = ( (size_t)(*p)[1] << 24 ) | ( (size_t)(*p)[2] << 16 ) |
Christopher Haster 1:24750b9ad5ef 97 ( (size_t)(*p)[3] << 8 ) | (*p)[4];
Christopher Haster 1:24750b9ad5ef 98 (*p) += 5;
Christopher Haster 1:24750b9ad5ef 99 break;
Christopher Haster 1:24750b9ad5ef 100
Christopher Haster 1:24750b9ad5ef 101 default:
Christopher Haster 1:24750b9ad5ef 102 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
Christopher Haster 1:24750b9ad5ef 103 }
Christopher Haster 1:24750b9ad5ef 104 }
Christopher Haster 1:24750b9ad5ef 105
Christopher Haster 1:24750b9ad5ef 106 if( *len > (size_t) ( end - *p ) )
Christopher Haster 1:24750b9ad5ef 107 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
Christopher Haster 1:24750b9ad5ef 108
Christopher Haster 1:24750b9ad5ef 109 return( 0 );
Christopher Haster 1:24750b9ad5ef 110 }
Christopher Haster 1:24750b9ad5ef 111
Christopher Haster 1:24750b9ad5ef 112 int mbedtls_asn1_get_tag( unsigned char **p,
Christopher Haster 1:24750b9ad5ef 113 const unsigned char *end,
Christopher Haster 1:24750b9ad5ef 114 size_t *len, int tag )
Christopher Haster 1:24750b9ad5ef 115 {
Christopher Haster 1:24750b9ad5ef 116 if( ( end - *p ) < 1 )
Christopher Haster 1:24750b9ad5ef 117 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
Christopher Haster 1:24750b9ad5ef 118
Christopher Haster 1:24750b9ad5ef 119 if( **p != tag )
Christopher Haster 1:24750b9ad5ef 120 return( MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
Christopher Haster 1:24750b9ad5ef 121
Christopher Haster 1:24750b9ad5ef 122 (*p)++;
Christopher Haster 1:24750b9ad5ef 123
Christopher Haster 1:24750b9ad5ef 124 return( mbedtls_asn1_get_len( p, end, len ) );
Christopher Haster 1:24750b9ad5ef 125 }
Christopher Haster 1:24750b9ad5ef 126
Christopher Haster 1:24750b9ad5ef 127 int mbedtls_asn1_get_bool( unsigned char **p,
Christopher Haster 1:24750b9ad5ef 128 const unsigned char *end,
Christopher Haster 1:24750b9ad5ef 129 int *val )
Christopher Haster 1:24750b9ad5ef 130 {
Christopher Haster 1:24750b9ad5ef 131 int ret;
Christopher Haster 1:24750b9ad5ef 132 size_t len;
Christopher Haster 1:24750b9ad5ef 133
Christopher Haster 1:24750b9ad5ef 134 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_BOOLEAN ) ) != 0 )
Christopher Haster 1:24750b9ad5ef 135 return( ret );
Christopher Haster 1:24750b9ad5ef 136
Christopher Haster 1:24750b9ad5ef 137 if( len != 1 )
Christopher Haster 1:24750b9ad5ef 138 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
Christopher Haster 1:24750b9ad5ef 139
Christopher Haster 1:24750b9ad5ef 140 *val = ( **p != 0 ) ? 1 : 0;
Christopher Haster 1:24750b9ad5ef 141 (*p)++;
Christopher Haster 1:24750b9ad5ef 142
Christopher Haster 1:24750b9ad5ef 143 return( 0 );
Christopher Haster 1:24750b9ad5ef 144 }
Christopher Haster 1:24750b9ad5ef 145
Christopher Haster 1:24750b9ad5ef 146 int mbedtls_asn1_get_int( unsigned char **p,
Christopher Haster 1:24750b9ad5ef 147 const unsigned char *end,
Christopher Haster 1:24750b9ad5ef 148 int *val )
Christopher Haster 1:24750b9ad5ef 149 {
Christopher Haster 1:24750b9ad5ef 150 int ret;
Christopher Haster 1:24750b9ad5ef 151 size_t len;
Christopher Haster 1:24750b9ad5ef 152
Christopher Haster 1:24750b9ad5ef 153 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
Christopher Haster 1:24750b9ad5ef 154 return( ret );
Christopher Haster 1:24750b9ad5ef 155
Christopher Haster 1:24750b9ad5ef 156 if( len > sizeof( int ) || ( **p & 0x80 ) != 0 )
Christopher Haster 1:24750b9ad5ef 157 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
Christopher Haster 1:24750b9ad5ef 158
Christopher Haster 1:24750b9ad5ef 159 *val = 0;
Christopher Haster 1:24750b9ad5ef 160
Christopher Haster 1:24750b9ad5ef 161 while( len-- > 0 )
Christopher Haster 1:24750b9ad5ef 162 {
Christopher Haster 1:24750b9ad5ef 163 *val = ( *val << 8 ) | **p;
Christopher Haster 1:24750b9ad5ef 164 (*p)++;
Christopher Haster 1:24750b9ad5ef 165 }
Christopher Haster 1:24750b9ad5ef 166
Christopher Haster 1:24750b9ad5ef 167 return( 0 );
Christopher Haster 1:24750b9ad5ef 168 }
Christopher Haster 1:24750b9ad5ef 169
Christopher Haster 1:24750b9ad5ef 170 #if defined(MBEDTLS_BIGNUM_C)
Christopher Haster 1:24750b9ad5ef 171 int mbedtls_asn1_get_mpi( unsigned char **p,
Christopher Haster 1:24750b9ad5ef 172 const unsigned char *end,
Christopher Haster 1:24750b9ad5ef 173 mbedtls_mpi *X )
Christopher Haster 1:24750b9ad5ef 174 {
Christopher Haster 1:24750b9ad5ef 175 int ret;
Christopher Haster 1:24750b9ad5ef 176 size_t len;
Christopher Haster 1:24750b9ad5ef 177
Christopher Haster 1:24750b9ad5ef 178 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
Christopher Haster 1:24750b9ad5ef 179 return( ret );
Christopher Haster 1:24750b9ad5ef 180
Christopher Haster 1:24750b9ad5ef 181 ret = mbedtls_mpi_read_binary( X, *p, len );
Christopher Haster 1:24750b9ad5ef 182
Christopher Haster 1:24750b9ad5ef 183 *p += len;
Christopher Haster 1:24750b9ad5ef 184
Christopher Haster 1:24750b9ad5ef 185 return( ret );
Christopher Haster 1:24750b9ad5ef 186 }
Christopher Haster 1:24750b9ad5ef 187 #endif /* MBEDTLS_BIGNUM_C */
Christopher Haster 1:24750b9ad5ef 188
Christopher Haster 1:24750b9ad5ef 189 int mbedtls_asn1_get_bitstring( unsigned char **p, const unsigned char *end,
Christopher Haster 1:24750b9ad5ef 190 mbedtls_asn1_bitstring *bs)
Christopher Haster 1:24750b9ad5ef 191 {
Christopher Haster 1:24750b9ad5ef 192 int ret;
Christopher Haster 1:24750b9ad5ef 193
Christopher Haster 1:24750b9ad5ef 194 /* Certificate type is a single byte bitstring */
Christopher Haster 1:24750b9ad5ef 195 if( ( ret = mbedtls_asn1_get_tag( p, end, &bs->len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
Christopher Haster 1:24750b9ad5ef 196 return( ret );
Christopher Haster 1:24750b9ad5ef 197
Christopher Haster 1:24750b9ad5ef 198 /* Check length, subtract one for actual bit string length */
Christopher Haster 1:24750b9ad5ef 199 if( bs->len < 1 )
Christopher Haster 1:24750b9ad5ef 200 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
Christopher Haster 1:24750b9ad5ef 201 bs->len -= 1;
Christopher Haster 1:24750b9ad5ef 202
Christopher Haster 1:24750b9ad5ef 203 /* Get number of unused bits, ensure unused bits <= 7 */
Christopher Haster 1:24750b9ad5ef 204 bs->unused_bits = **p;
Christopher Haster 1:24750b9ad5ef 205 if( bs->unused_bits > 7 )
Christopher Haster 1:24750b9ad5ef 206 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
Christopher Haster 1:24750b9ad5ef 207 (*p)++;
Christopher Haster 1:24750b9ad5ef 208
Christopher Haster 1:24750b9ad5ef 209 /* Get actual bitstring */
Christopher Haster 1:24750b9ad5ef 210 bs->p = *p;
Christopher Haster 1:24750b9ad5ef 211 *p += bs->len;
Christopher Haster 1:24750b9ad5ef 212
Christopher Haster 1:24750b9ad5ef 213 if( *p != end )
Christopher Haster 1:24750b9ad5ef 214 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Christopher Haster 1:24750b9ad5ef 215
Christopher Haster 1:24750b9ad5ef 216 return( 0 );
Christopher Haster 1:24750b9ad5ef 217 }
Christopher Haster 1:24750b9ad5ef 218
Christopher Haster 1:24750b9ad5ef 219 /*
Christopher Haster 1:24750b9ad5ef 220 * Get a bit string without unused bits
Christopher Haster 1:24750b9ad5ef 221 */
Christopher Haster 1:24750b9ad5ef 222 int mbedtls_asn1_get_bitstring_null( unsigned char **p, const unsigned char *end,
Christopher Haster 1:24750b9ad5ef 223 size_t *len )
Christopher Haster 1:24750b9ad5ef 224 {
Christopher Haster 1:24750b9ad5ef 225 int ret;
Christopher Haster 1:24750b9ad5ef 226
Christopher Haster 1:24750b9ad5ef 227 if( ( ret = mbedtls_asn1_get_tag( p, end, len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
Christopher Haster 1:24750b9ad5ef 228 return( ret );
Christopher Haster 1:24750b9ad5ef 229
Christopher Haster 1:24750b9ad5ef 230 if( (*len)-- < 2 || *(*p)++ != 0 )
Christopher Haster 1:24750b9ad5ef 231 return( MBEDTLS_ERR_ASN1_INVALID_DATA );
Christopher Haster 1:24750b9ad5ef 232
Christopher Haster 1:24750b9ad5ef 233 return( 0 );
Christopher Haster 1:24750b9ad5ef 234 }
Christopher Haster 1:24750b9ad5ef 235
Christopher Haster 1:24750b9ad5ef 236
Christopher Haster 1:24750b9ad5ef 237
Christopher Haster 1:24750b9ad5ef 238 /*
Christopher Haster 1:24750b9ad5ef 239 * Parses and splits an ASN.1 "SEQUENCE OF <tag>"
Christopher Haster 1:24750b9ad5ef 240 */
Christopher Haster 1:24750b9ad5ef 241 int mbedtls_asn1_get_sequence_of( unsigned char **p,
Christopher Haster 1:24750b9ad5ef 242 const unsigned char *end,
Christopher Haster 1:24750b9ad5ef 243 mbedtls_asn1_sequence *cur,
Christopher Haster 1:24750b9ad5ef 244 int tag)
Christopher Haster 1:24750b9ad5ef 245 {
Christopher Haster 1:24750b9ad5ef 246 int ret;
Christopher Haster 1:24750b9ad5ef 247 size_t len;
Christopher Haster 1:24750b9ad5ef 248 mbedtls_asn1_buf *buf;
Christopher Haster 1:24750b9ad5ef 249
Christopher Haster 1:24750b9ad5ef 250 /* Get main sequence tag */
Christopher Haster 1:24750b9ad5ef 251 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
Christopher Haster 1:24750b9ad5ef 252 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
Christopher Haster 1:24750b9ad5ef 253 return( ret );
Christopher Haster 1:24750b9ad5ef 254
Christopher Haster 1:24750b9ad5ef 255 if( *p + len != end )
Christopher Haster 1:24750b9ad5ef 256 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Christopher Haster 1:24750b9ad5ef 257
Christopher Haster 1:24750b9ad5ef 258 while( *p < end )
Christopher Haster 1:24750b9ad5ef 259 {
Christopher Haster 1:24750b9ad5ef 260 buf = &(cur->buf);
Christopher Haster 1:24750b9ad5ef 261 buf->tag = **p;
Christopher Haster 1:24750b9ad5ef 262
Christopher Haster 1:24750b9ad5ef 263 if( ( ret = mbedtls_asn1_get_tag( p, end, &buf->len, tag ) ) != 0 )
Christopher Haster 1:24750b9ad5ef 264 return( ret );
Christopher Haster 1:24750b9ad5ef 265
Christopher Haster 1:24750b9ad5ef 266 buf->p = *p;
Christopher Haster 1:24750b9ad5ef 267 *p += buf->len;
Christopher Haster 1:24750b9ad5ef 268
Christopher Haster 1:24750b9ad5ef 269 /* Allocate and assign next pointer */
Christopher Haster 1:24750b9ad5ef 270 if( *p < end )
Christopher Haster 1:24750b9ad5ef 271 {
Christopher Haster 1:24750b9ad5ef 272 cur->next = mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) );
Christopher Haster 1:24750b9ad5ef 273
Christopher Haster 1:24750b9ad5ef 274 if( cur->next == NULL )
Christopher Haster 1:24750b9ad5ef 275 return( MBEDTLS_ERR_ASN1_ALLOC_FAILED );
Christopher Haster 1:24750b9ad5ef 276
Christopher Haster 1:24750b9ad5ef 277 cur = cur->next;
Christopher Haster 1:24750b9ad5ef 278 }
Christopher Haster 1:24750b9ad5ef 279 }
Christopher Haster 1:24750b9ad5ef 280
Christopher Haster 1:24750b9ad5ef 281 /* Set final sequence entry's next pointer to NULL */
Christopher Haster 1:24750b9ad5ef 282 cur->next = NULL;
Christopher Haster 1:24750b9ad5ef 283
Christopher Haster 1:24750b9ad5ef 284 if( *p != end )
Christopher Haster 1:24750b9ad5ef 285 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Christopher Haster 1:24750b9ad5ef 286
Christopher Haster 1:24750b9ad5ef 287 return( 0 );
Christopher Haster 1:24750b9ad5ef 288 }
Christopher Haster 1:24750b9ad5ef 289
Christopher Haster 1:24750b9ad5ef 290 int mbedtls_asn1_get_alg( unsigned char **p,
Christopher Haster 1:24750b9ad5ef 291 const unsigned char *end,
Christopher Haster 1:24750b9ad5ef 292 mbedtls_asn1_buf *alg, mbedtls_asn1_buf *params )
Christopher Haster 1:24750b9ad5ef 293 {
Christopher Haster 1:24750b9ad5ef 294 int ret;
Christopher Haster 1:24750b9ad5ef 295 size_t len;
Christopher Haster 1:24750b9ad5ef 296
Christopher Haster 1:24750b9ad5ef 297 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
Christopher Haster 1:24750b9ad5ef 298 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
Christopher Haster 1:24750b9ad5ef 299 return( ret );
Christopher Haster 1:24750b9ad5ef 300
Christopher Haster 1:24750b9ad5ef 301 if( ( end - *p ) < 1 )
Christopher Haster 1:24750b9ad5ef 302 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
Christopher Haster 1:24750b9ad5ef 303
Christopher Haster 1:24750b9ad5ef 304 alg->tag = **p;
Christopher Haster 1:24750b9ad5ef 305 end = *p + len;
Christopher Haster 1:24750b9ad5ef 306
Christopher Haster 1:24750b9ad5ef 307 if( ( ret = mbedtls_asn1_get_tag( p, end, &alg->len, MBEDTLS_ASN1_OID ) ) != 0 )
Christopher Haster 1:24750b9ad5ef 308 return( ret );
Christopher Haster 1:24750b9ad5ef 309
Christopher Haster 1:24750b9ad5ef 310 alg->p = *p;
Christopher Haster 1:24750b9ad5ef 311 *p += alg->len;
Christopher Haster 1:24750b9ad5ef 312
Christopher Haster 1:24750b9ad5ef 313 if( *p == end )
Christopher Haster 1:24750b9ad5ef 314 {
Christopher Haster 1:24750b9ad5ef 315 mbedtls_zeroize( params, sizeof(mbedtls_asn1_buf) );
Christopher Haster 1:24750b9ad5ef 316 return( 0 );
Christopher Haster 1:24750b9ad5ef 317 }
Christopher Haster 1:24750b9ad5ef 318
Christopher Haster 1:24750b9ad5ef 319 params->tag = **p;
Christopher Haster 1:24750b9ad5ef 320 (*p)++;
Christopher Haster 1:24750b9ad5ef 321
Christopher Haster 1:24750b9ad5ef 322 if( ( ret = mbedtls_asn1_get_len( p, end, &params->len ) ) != 0 )
Christopher Haster 1:24750b9ad5ef 323 return( ret );
Christopher Haster 1:24750b9ad5ef 324
Christopher Haster 1:24750b9ad5ef 325 params->p = *p;
Christopher Haster 1:24750b9ad5ef 326 *p += params->len;
Christopher Haster 1:24750b9ad5ef 327
Christopher Haster 1:24750b9ad5ef 328 if( *p != end )
Christopher Haster 1:24750b9ad5ef 329 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
Christopher Haster 1:24750b9ad5ef 330
Christopher Haster 1:24750b9ad5ef 331 return( 0 );
Christopher Haster 1:24750b9ad5ef 332 }
Christopher Haster 1:24750b9ad5ef 333
Christopher Haster 1:24750b9ad5ef 334 int mbedtls_asn1_get_alg_null( unsigned char **p,
Christopher Haster 1:24750b9ad5ef 335 const unsigned char *end,
Christopher Haster 1:24750b9ad5ef 336 mbedtls_asn1_buf *alg )
Christopher Haster 1:24750b9ad5ef 337 {
Christopher Haster 1:24750b9ad5ef 338 int ret;
Christopher Haster 1:24750b9ad5ef 339 mbedtls_asn1_buf params;
Christopher Haster 1:24750b9ad5ef 340
Christopher Haster 1:24750b9ad5ef 341 memset( &params, 0, sizeof(mbedtls_asn1_buf) );
Christopher Haster 1:24750b9ad5ef 342
Christopher Haster 1:24750b9ad5ef 343 if( ( ret = mbedtls_asn1_get_alg( p, end, alg, &params ) ) != 0 )
Christopher Haster 1:24750b9ad5ef 344 return( ret );
Christopher Haster 1:24750b9ad5ef 345
Christopher Haster 1:24750b9ad5ef 346 if( ( params.tag != MBEDTLS_ASN1_NULL && params.tag != 0 ) || params.len != 0 )
Christopher Haster 1:24750b9ad5ef 347 return( MBEDTLS_ERR_ASN1_INVALID_DATA );
Christopher Haster 1:24750b9ad5ef 348
Christopher Haster 1:24750b9ad5ef 349 return( 0 );
Christopher Haster 1:24750b9ad5ef 350 }
Christopher Haster 1:24750b9ad5ef 351
Christopher Haster 1:24750b9ad5ef 352 void mbedtls_asn1_free_named_data( mbedtls_asn1_named_data *cur )
Christopher Haster 1:24750b9ad5ef 353 {
Christopher Haster 1:24750b9ad5ef 354 if( cur == NULL )
Christopher Haster 1:24750b9ad5ef 355 return;
Christopher Haster 1:24750b9ad5ef 356
Christopher Haster 1:24750b9ad5ef 357 mbedtls_free( cur->oid.p );
Christopher Haster 1:24750b9ad5ef 358 mbedtls_free( cur->val.p );
Christopher Haster 1:24750b9ad5ef 359
Christopher Haster 1:24750b9ad5ef 360 mbedtls_zeroize( cur, sizeof( mbedtls_asn1_named_data ) );
Christopher Haster 1:24750b9ad5ef 361 }
Christopher Haster 1:24750b9ad5ef 362
Christopher Haster 1:24750b9ad5ef 363 void mbedtls_asn1_free_named_data_list( mbedtls_asn1_named_data **head )
Christopher Haster 1:24750b9ad5ef 364 {
Christopher Haster 1:24750b9ad5ef 365 mbedtls_asn1_named_data *cur;
Christopher Haster 1:24750b9ad5ef 366
Christopher Haster 1:24750b9ad5ef 367 while( ( cur = *head ) != NULL )
Christopher Haster 1:24750b9ad5ef 368 {
Christopher Haster 1:24750b9ad5ef 369 *head = cur->next;
Christopher Haster 1:24750b9ad5ef 370 mbedtls_asn1_free_named_data( cur );
Christopher Haster 1:24750b9ad5ef 371 mbedtls_free( cur );
Christopher Haster 1:24750b9ad5ef 372 }
Christopher Haster 1:24750b9ad5ef 373 }
Christopher Haster 1:24750b9ad5ef 374
Christopher Haster 1:24750b9ad5ef 375 mbedtls_asn1_named_data *mbedtls_asn1_find_named_data( mbedtls_asn1_named_data *list,
Christopher Haster 1:24750b9ad5ef 376 const char *oid, size_t len )
Christopher Haster 1:24750b9ad5ef 377 {
Christopher Haster 1:24750b9ad5ef 378 while( list != NULL )
Christopher Haster 1:24750b9ad5ef 379 {
Christopher Haster 1:24750b9ad5ef 380 if( list->oid.len == len &&
Christopher Haster 1:24750b9ad5ef 381 memcmp( list->oid.p, oid, len ) == 0 )
Christopher Haster 1:24750b9ad5ef 382 {
Christopher Haster 1:24750b9ad5ef 383 break;
Christopher Haster 1:24750b9ad5ef 384 }
Christopher Haster 1:24750b9ad5ef 385
Christopher Haster 1:24750b9ad5ef 386 list = list->next;
Christopher Haster 1:24750b9ad5ef 387 }
Christopher Haster 1:24750b9ad5ef 388
Christopher Haster 1:24750b9ad5ef 389 return( list );
Christopher Haster 1:24750b9ad5ef 390 }
Christopher Haster 1:24750b9ad5ef 391
Christopher Haster 1:24750b9ad5ef 392 #endif /* MBEDTLS_ASN1_PARSE_C */