Timothy Beight / Mbed 2 deprecated 6_songs-from-the-cloud

This is a fork due to permission issues

Dependencies:   mbed Socket lwip-eth lwip-sys lwip

Fork of 6_songs-from-the-cloud by MakingMusicWorkshop

mbed-client/mbedtls/source/asn1parse.c@0:f7c60d3e7b8a, 2016-05-18 (annotated)

Committer:
maclobdell
Date:
Wed May 18 19:06:32 2016 +0000
Revision:
0:f7c60d3e7b8a
clean version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
maclobdell 0:f7c60d3e7b8a 1 /*
maclobdell 0:f7c60d3e7b8a 2 * Generic ASN.1 parsing
maclobdell 0:f7c60d3e7b8a 3 *
maclobdell 0:f7c60d3e7b8a 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
maclobdell 0:f7c60d3e7b8a 5 * SPDX-License-Identifier: Apache-2.0
maclobdell 0:f7c60d3e7b8a 6 *
maclobdell 0:f7c60d3e7b8a 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
maclobdell 0:f7c60d3e7b8a 8 * not use this file except in compliance with the License.
maclobdell 0:f7c60d3e7b8a 9 * You may obtain a copy of the License at
maclobdell 0:f7c60d3e7b8a 10 *
maclobdell 0:f7c60d3e7b8a 11 * http://www.apache.org/licenses/LICENSE-2.0
maclobdell 0:f7c60d3e7b8a 12 *
maclobdell 0:f7c60d3e7b8a 13 * Unless required by applicable law or agreed to in writing, software
maclobdell 0:f7c60d3e7b8a 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
maclobdell 0:f7c60d3e7b8a 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
maclobdell 0:f7c60d3e7b8a 16 * See the License for the specific language governing permissions and
maclobdell 0:f7c60d3e7b8a 17 * limitations under the License.
maclobdell 0:f7c60d3e7b8a 18 *
maclobdell 0:f7c60d3e7b8a 19 * This file is part of mbed TLS (https://tls.mbed.org)
maclobdell 0:f7c60d3e7b8a 20 */
maclobdell 0:f7c60d3e7b8a 21
maclobdell 0:f7c60d3e7b8a 22 #if !defined(MBEDTLS_CONFIG_FILE)
maclobdell 0:f7c60d3e7b8a 23 #include "mbedtls/config.h"
maclobdell 0:f7c60d3e7b8a 24 #else
maclobdell 0:f7c60d3e7b8a 25 #include MBEDTLS_CONFIG_FILE
maclobdell 0:f7c60d3e7b8a 26 #endif
maclobdell 0:f7c60d3e7b8a 27
maclobdell 0:f7c60d3e7b8a 28 #if defined(MBEDTLS_ASN1_PARSE_C)
maclobdell 0:f7c60d3e7b8a 29
maclobdell 0:f7c60d3e7b8a 30 #include "mbedtls/asn1.h"
maclobdell 0:f7c60d3e7b8a 31
maclobdell 0:f7c60d3e7b8a 32 #include <string.h>
maclobdell 0:f7c60d3e7b8a 33
maclobdell 0:f7c60d3e7b8a 34 #if defined(MBEDTLS_BIGNUM_C)
maclobdell 0:f7c60d3e7b8a 35 #include "mbedtls/bignum.h"
maclobdell 0:f7c60d3e7b8a 36 #endif
maclobdell 0:f7c60d3e7b8a 37
maclobdell 0:f7c60d3e7b8a 38 #if defined(MBEDTLS_PLATFORM_C)
maclobdell 0:f7c60d3e7b8a 39 #include "mbedtls/platform.h"
maclobdell 0:f7c60d3e7b8a 40 #else
maclobdell 0:f7c60d3e7b8a 41 #include <stdlib.h>
maclobdell 0:f7c60d3e7b8a 42 #define mbedtls_calloc calloc
maclobdell 0:f7c60d3e7b8a 43 #define mbedtls_free free
maclobdell 0:f7c60d3e7b8a 44 #endif
maclobdell 0:f7c60d3e7b8a 45
maclobdell 0:f7c60d3e7b8a 46 /* Implementation that should never be optimized out by the compiler */
maclobdell 0:f7c60d3e7b8a 47 static void mbedtls_zeroize( void *v, size_t n ) {
maclobdell 0:f7c60d3e7b8a 48 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
maclobdell 0:f7c60d3e7b8a 49 }
maclobdell 0:f7c60d3e7b8a 50
maclobdell 0:f7c60d3e7b8a 51 /*
maclobdell 0:f7c60d3e7b8a 52 * ASN.1 DER decoding routines
maclobdell 0:f7c60d3e7b8a 53 */
maclobdell 0:f7c60d3e7b8a 54 int mbedtls_asn1_get_len( unsigned char **p,
maclobdell 0:f7c60d3e7b8a 55 const unsigned char *end,
maclobdell 0:f7c60d3e7b8a 56 size_t *len )
maclobdell 0:f7c60d3e7b8a 57 {
maclobdell 0:f7c60d3e7b8a 58 if( ( end - *p ) < 1 )
maclobdell 0:f7c60d3e7b8a 59 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
maclobdell 0:f7c60d3e7b8a 60
maclobdell 0:f7c60d3e7b8a 61 if( ( **p & 0x80 ) == 0 )
maclobdell 0:f7c60d3e7b8a 62 *len = *(*p)++;
maclobdell 0:f7c60d3e7b8a 63 else
maclobdell 0:f7c60d3e7b8a 64 {
maclobdell 0:f7c60d3e7b8a 65 switch( **p & 0x7F )
maclobdell 0:f7c60d3e7b8a 66 {
maclobdell 0:f7c60d3e7b8a 67 case 1:
maclobdell 0:f7c60d3e7b8a 68 if( ( end - *p ) < 2 )
maclobdell 0:f7c60d3e7b8a 69 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
maclobdell 0:f7c60d3e7b8a 70
maclobdell 0:f7c60d3e7b8a 71 *len = (*p)[1];
maclobdell 0:f7c60d3e7b8a 72 (*p) += 2;
maclobdell 0:f7c60d3e7b8a 73 break;
maclobdell 0:f7c60d3e7b8a 74
maclobdell 0:f7c60d3e7b8a 75 case 2:
maclobdell 0:f7c60d3e7b8a 76 if( ( end - *p ) < 3 )
maclobdell 0:f7c60d3e7b8a 77 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
maclobdell 0:f7c60d3e7b8a 78
maclobdell 0:f7c60d3e7b8a 79 *len = ( (size_t)(*p)[1] << 8 ) | (*p)[2];
maclobdell 0:f7c60d3e7b8a 80 (*p) += 3;
maclobdell 0:f7c60d3e7b8a 81 break;
maclobdell 0:f7c60d3e7b8a 82
maclobdell 0:f7c60d3e7b8a 83 case 3:
maclobdell 0:f7c60d3e7b8a 84 if( ( end - *p ) < 4 )
maclobdell 0:f7c60d3e7b8a 85 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
maclobdell 0:f7c60d3e7b8a 86
maclobdell 0:f7c60d3e7b8a 87 *len = ( (size_t)(*p)[1] << 16 ) |
maclobdell 0:f7c60d3e7b8a 88 ( (size_t)(*p)[2] << 8 ) | (*p)[3];
maclobdell 0:f7c60d3e7b8a 89 (*p) += 4;
maclobdell 0:f7c60d3e7b8a 90 break;
maclobdell 0:f7c60d3e7b8a 91
maclobdell 0:f7c60d3e7b8a 92 case 4:
maclobdell 0:f7c60d3e7b8a 93 if( ( end - *p ) < 5 )
maclobdell 0:f7c60d3e7b8a 94 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
maclobdell 0:f7c60d3e7b8a 95
maclobdell 0:f7c60d3e7b8a 96 *len = ( (size_t)(*p)[1] << 24 ) | ( (size_t)(*p)[2] << 16 ) |
maclobdell 0:f7c60d3e7b8a 97 ( (size_t)(*p)[3] << 8 ) | (*p)[4];
maclobdell 0:f7c60d3e7b8a 98 (*p) += 5;
maclobdell 0:f7c60d3e7b8a 99 break;
maclobdell 0:f7c60d3e7b8a 100
maclobdell 0:f7c60d3e7b8a 101 default:
maclobdell 0:f7c60d3e7b8a 102 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
maclobdell 0:f7c60d3e7b8a 103 }
maclobdell 0:f7c60d3e7b8a 104 }
maclobdell 0:f7c60d3e7b8a 105
maclobdell 0:f7c60d3e7b8a 106 if( *len > (size_t) ( end - *p ) )
maclobdell 0:f7c60d3e7b8a 107 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
maclobdell 0:f7c60d3e7b8a 108
maclobdell 0:f7c60d3e7b8a 109 return( 0 );
maclobdell 0:f7c60d3e7b8a 110 }
maclobdell 0:f7c60d3e7b8a 111
maclobdell 0:f7c60d3e7b8a 112 int mbedtls_asn1_get_tag( unsigned char **p,
maclobdell 0:f7c60d3e7b8a 113 const unsigned char *end,
maclobdell 0:f7c60d3e7b8a 114 size_t *len, int tag )
maclobdell 0:f7c60d3e7b8a 115 {
maclobdell 0:f7c60d3e7b8a 116 if( ( end - *p ) < 1 )
maclobdell 0:f7c60d3e7b8a 117 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
maclobdell 0:f7c60d3e7b8a 118
maclobdell 0:f7c60d3e7b8a 119 if( **p != tag )
maclobdell 0:f7c60d3e7b8a 120 return( MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
maclobdell 0:f7c60d3e7b8a 121
maclobdell 0:f7c60d3e7b8a 122 (*p)++;
maclobdell 0:f7c60d3e7b8a 123
maclobdell 0:f7c60d3e7b8a 124 return( mbedtls_asn1_get_len( p, end, len ) );
maclobdell 0:f7c60d3e7b8a 125 }
maclobdell 0:f7c60d3e7b8a 126
maclobdell 0:f7c60d3e7b8a 127 int mbedtls_asn1_get_bool( unsigned char **p,
maclobdell 0:f7c60d3e7b8a 128 const unsigned char *end,
maclobdell 0:f7c60d3e7b8a 129 int *val )
maclobdell 0:f7c60d3e7b8a 130 {
maclobdell 0:f7c60d3e7b8a 131 int ret;
maclobdell 0:f7c60d3e7b8a 132 size_t len;
maclobdell 0:f7c60d3e7b8a 133
maclobdell 0:f7c60d3e7b8a 134 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_BOOLEAN ) ) != 0 )
maclobdell 0:f7c60d3e7b8a 135 return( ret );
maclobdell 0:f7c60d3e7b8a 136
maclobdell 0:f7c60d3e7b8a 137 if( len != 1 )
maclobdell 0:f7c60d3e7b8a 138 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
maclobdell 0:f7c60d3e7b8a 139
maclobdell 0:f7c60d3e7b8a 140 *val = ( **p != 0 ) ? 1 : 0;
maclobdell 0:f7c60d3e7b8a 141 (*p)++;
maclobdell 0:f7c60d3e7b8a 142
maclobdell 0:f7c60d3e7b8a 143 return( 0 );
maclobdell 0:f7c60d3e7b8a 144 }
maclobdell 0:f7c60d3e7b8a 145
maclobdell 0:f7c60d3e7b8a 146 int mbedtls_asn1_get_int( unsigned char **p,
maclobdell 0:f7c60d3e7b8a 147 const unsigned char *end,
maclobdell 0:f7c60d3e7b8a 148 int *val )
maclobdell 0:f7c60d3e7b8a 149 {
maclobdell 0:f7c60d3e7b8a 150 int ret;
maclobdell 0:f7c60d3e7b8a 151 size_t len;
maclobdell 0:f7c60d3e7b8a 152
maclobdell 0:f7c60d3e7b8a 153 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
maclobdell 0:f7c60d3e7b8a 154 return( ret );
maclobdell 0:f7c60d3e7b8a 155
maclobdell 0:f7c60d3e7b8a 156 if( len > sizeof( int ) || ( **p & 0x80 ) != 0 )
maclobdell 0:f7c60d3e7b8a 157 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
maclobdell 0:f7c60d3e7b8a 158
maclobdell 0:f7c60d3e7b8a 159 *val = 0;
maclobdell 0:f7c60d3e7b8a 160
maclobdell 0:f7c60d3e7b8a 161 while( len-- > 0 )
maclobdell 0:f7c60d3e7b8a 162 {
maclobdell 0:f7c60d3e7b8a 163 *val = ( *val << 8 ) | **p;
maclobdell 0:f7c60d3e7b8a 164 (*p)++;
maclobdell 0:f7c60d3e7b8a 165 }
maclobdell 0:f7c60d3e7b8a 166
maclobdell 0:f7c60d3e7b8a 167 return( 0 );
maclobdell 0:f7c60d3e7b8a 168 }
maclobdell 0:f7c60d3e7b8a 169
maclobdell 0:f7c60d3e7b8a 170 #if defined(MBEDTLS_BIGNUM_C)
maclobdell 0:f7c60d3e7b8a 171 int mbedtls_asn1_get_mpi( unsigned char **p,
maclobdell 0:f7c60d3e7b8a 172 const unsigned char *end,
maclobdell 0:f7c60d3e7b8a 173 mbedtls_mpi *X )
maclobdell 0:f7c60d3e7b8a 174 {
maclobdell 0:f7c60d3e7b8a 175 int ret;
maclobdell 0:f7c60d3e7b8a 176 size_t len;
maclobdell 0:f7c60d3e7b8a 177
maclobdell 0:f7c60d3e7b8a 178 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
maclobdell 0:f7c60d3e7b8a 179 return( ret );
maclobdell 0:f7c60d3e7b8a 180
maclobdell 0:f7c60d3e7b8a 181 ret = mbedtls_mpi_read_binary( X, *p, len );
maclobdell 0:f7c60d3e7b8a 182
maclobdell 0:f7c60d3e7b8a 183 *p += len;
maclobdell 0:f7c60d3e7b8a 184
maclobdell 0:f7c60d3e7b8a 185 return( ret );
maclobdell 0:f7c60d3e7b8a 186 }
maclobdell 0:f7c60d3e7b8a 187 #endif /* MBEDTLS_BIGNUM_C */
maclobdell 0:f7c60d3e7b8a 188
maclobdell 0:f7c60d3e7b8a 189 int mbedtls_asn1_get_bitstring( unsigned char **p, const unsigned char *end,
maclobdell 0:f7c60d3e7b8a 190 mbedtls_asn1_bitstring *bs)
maclobdell 0:f7c60d3e7b8a 191 {
maclobdell 0:f7c60d3e7b8a 192 int ret;
maclobdell 0:f7c60d3e7b8a 193
maclobdell 0:f7c60d3e7b8a 194 /* Certificate type is a single byte bitstring */
maclobdell 0:f7c60d3e7b8a 195 if( ( ret = mbedtls_asn1_get_tag( p, end, &bs->len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
maclobdell 0:f7c60d3e7b8a 196 return( ret );
maclobdell 0:f7c60d3e7b8a 197
maclobdell 0:f7c60d3e7b8a 198 /* Check length, subtract one for actual bit string length */
maclobdell 0:f7c60d3e7b8a 199 if( bs->len < 1 )
maclobdell 0:f7c60d3e7b8a 200 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
maclobdell 0:f7c60d3e7b8a 201 bs->len -= 1;
maclobdell 0:f7c60d3e7b8a 202
maclobdell 0:f7c60d3e7b8a 203 /* Get number of unused bits, ensure unused bits <= 7 */
maclobdell 0:f7c60d3e7b8a 204 bs->unused_bits = **p;
maclobdell 0:f7c60d3e7b8a 205 if( bs->unused_bits > 7 )
maclobdell 0:f7c60d3e7b8a 206 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
maclobdell 0:f7c60d3e7b8a 207 (*p)++;
maclobdell 0:f7c60d3e7b8a 208
maclobdell 0:f7c60d3e7b8a 209 /* Get actual bitstring */
maclobdell 0:f7c60d3e7b8a 210 bs->p = *p;
maclobdell 0:f7c60d3e7b8a 211 *p += bs->len;
maclobdell 0:f7c60d3e7b8a 212
maclobdell 0:f7c60d3e7b8a 213 if( *p != end )
maclobdell 0:f7c60d3e7b8a 214 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
maclobdell 0:f7c60d3e7b8a 215
maclobdell 0:f7c60d3e7b8a 216 return( 0 );
maclobdell 0:f7c60d3e7b8a 217 }
maclobdell 0:f7c60d3e7b8a 218
maclobdell 0:f7c60d3e7b8a 219 /*
maclobdell 0:f7c60d3e7b8a 220 * Get a bit string without unused bits
maclobdell 0:f7c60d3e7b8a 221 */
maclobdell 0:f7c60d3e7b8a 222 int mbedtls_asn1_get_bitstring_null( unsigned char **p, const unsigned char *end,
maclobdell 0:f7c60d3e7b8a 223 size_t *len )
maclobdell 0:f7c60d3e7b8a 224 {
maclobdell 0:f7c60d3e7b8a 225 int ret;
maclobdell 0:f7c60d3e7b8a 226
maclobdell 0:f7c60d3e7b8a 227 if( ( ret = mbedtls_asn1_get_tag( p, end, len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
maclobdell 0:f7c60d3e7b8a 228 return( ret );
maclobdell 0:f7c60d3e7b8a 229
maclobdell 0:f7c60d3e7b8a 230 if( (*len)-- < 2 || *(*p)++ != 0 )
maclobdell 0:f7c60d3e7b8a 231 return( MBEDTLS_ERR_ASN1_INVALID_DATA );
maclobdell 0:f7c60d3e7b8a 232
maclobdell 0:f7c60d3e7b8a 233 return( 0 );
maclobdell 0:f7c60d3e7b8a 234 }
maclobdell 0:f7c60d3e7b8a 235
maclobdell 0:f7c60d3e7b8a 236
maclobdell 0:f7c60d3e7b8a 237
maclobdell 0:f7c60d3e7b8a 238 /*
maclobdell 0:f7c60d3e7b8a 239 * Parses and splits an ASN.1 "SEQUENCE OF <tag>"
maclobdell 0:f7c60d3e7b8a 240 */
maclobdell 0:f7c60d3e7b8a 241 int mbedtls_asn1_get_sequence_of( unsigned char **p,
maclobdell 0:f7c60d3e7b8a 242 const unsigned char *end,
maclobdell 0:f7c60d3e7b8a 243 mbedtls_asn1_sequence *cur,
maclobdell 0:f7c60d3e7b8a 244 int tag)
maclobdell 0:f7c60d3e7b8a 245 {
maclobdell 0:f7c60d3e7b8a 246 int ret;
maclobdell 0:f7c60d3e7b8a 247 size_t len;
maclobdell 0:f7c60d3e7b8a 248 mbedtls_asn1_buf *buf;
maclobdell 0:f7c60d3e7b8a 249
maclobdell 0:f7c60d3e7b8a 250 /* Get main sequence tag */
maclobdell 0:f7c60d3e7b8a 251 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
maclobdell 0:f7c60d3e7b8a 252 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
maclobdell 0:f7c60d3e7b8a 253 return( ret );
maclobdell 0:f7c60d3e7b8a 254
maclobdell 0:f7c60d3e7b8a 255 if( *p + len != end )
maclobdell 0:f7c60d3e7b8a 256 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
maclobdell 0:f7c60d3e7b8a 257
maclobdell 0:f7c60d3e7b8a 258 while( *p < end )
maclobdell 0:f7c60d3e7b8a 259 {
maclobdell 0:f7c60d3e7b8a 260 buf = &(cur->buf);
maclobdell 0:f7c60d3e7b8a 261 buf->tag = **p;
maclobdell 0:f7c60d3e7b8a 262
maclobdell 0:f7c60d3e7b8a 263 if( ( ret = mbedtls_asn1_get_tag( p, end, &buf->len, tag ) ) != 0 )
maclobdell 0:f7c60d3e7b8a 264 return( ret );
maclobdell 0:f7c60d3e7b8a 265
maclobdell 0:f7c60d3e7b8a 266 buf->p = *p;
maclobdell 0:f7c60d3e7b8a 267 *p += buf->len;
maclobdell 0:f7c60d3e7b8a 268
maclobdell 0:f7c60d3e7b8a 269 /* Allocate and assign next pointer */
maclobdell 0:f7c60d3e7b8a 270 if( *p < end )
maclobdell 0:f7c60d3e7b8a 271 {
maclobdell 0:f7c60d3e7b8a 272 cur->next = mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) );
maclobdell 0:f7c60d3e7b8a 273
maclobdell 0:f7c60d3e7b8a 274 if( cur->next == NULL )
maclobdell 0:f7c60d3e7b8a 275 return( MBEDTLS_ERR_ASN1_ALLOC_FAILED );
maclobdell 0:f7c60d3e7b8a 276
maclobdell 0:f7c60d3e7b8a 277 cur = cur->next;
maclobdell 0:f7c60d3e7b8a 278 }
maclobdell 0:f7c60d3e7b8a 279 }
maclobdell 0:f7c60d3e7b8a 280
maclobdell 0:f7c60d3e7b8a 281 /* Set final sequence entry's next pointer to NULL */
maclobdell 0:f7c60d3e7b8a 282 cur->next = NULL;
maclobdell 0:f7c60d3e7b8a 283
maclobdell 0:f7c60d3e7b8a 284 if( *p != end )
maclobdell 0:f7c60d3e7b8a 285 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
maclobdell 0:f7c60d3e7b8a 286
maclobdell 0:f7c60d3e7b8a 287 return( 0 );
maclobdell 0:f7c60d3e7b8a 288 }
maclobdell 0:f7c60d3e7b8a 289
maclobdell 0:f7c60d3e7b8a 290 int mbedtls_asn1_get_alg( unsigned char **p,
maclobdell 0:f7c60d3e7b8a 291 const unsigned char *end,
maclobdell 0:f7c60d3e7b8a 292 mbedtls_asn1_buf *alg, mbedtls_asn1_buf *params )
maclobdell 0:f7c60d3e7b8a 293 {
maclobdell 0:f7c60d3e7b8a 294 int ret;
maclobdell 0:f7c60d3e7b8a 295 size_t len;
maclobdell 0:f7c60d3e7b8a 296
maclobdell 0:f7c60d3e7b8a 297 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
maclobdell 0:f7c60d3e7b8a 298 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
maclobdell 0:f7c60d3e7b8a 299 return( ret );
maclobdell 0:f7c60d3e7b8a 300
maclobdell 0:f7c60d3e7b8a 301 if( ( end - *p ) < 1 )
maclobdell 0:f7c60d3e7b8a 302 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
maclobdell 0:f7c60d3e7b8a 303
maclobdell 0:f7c60d3e7b8a 304 alg->tag = **p;
maclobdell 0:f7c60d3e7b8a 305 end = *p + len;
maclobdell 0:f7c60d3e7b8a 306
maclobdell 0:f7c60d3e7b8a 307 if( ( ret = mbedtls_asn1_get_tag( p, end, &alg->len, MBEDTLS_ASN1_OID ) ) != 0 )
maclobdell 0:f7c60d3e7b8a 308 return( ret );
maclobdell 0:f7c60d3e7b8a 309
maclobdell 0:f7c60d3e7b8a 310 alg->p = *p;
maclobdell 0:f7c60d3e7b8a 311 *p += alg->len;
maclobdell 0:f7c60d3e7b8a 312
maclobdell 0:f7c60d3e7b8a 313 if( *p == end )
maclobdell 0:f7c60d3e7b8a 314 {
maclobdell 0:f7c60d3e7b8a 315 mbedtls_zeroize( params, sizeof(mbedtls_asn1_buf) );
maclobdell 0:f7c60d3e7b8a 316 return( 0 );
maclobdell 0:f7c60d3e7b8a 317 }
maclobdell 0:f7c60d3e7b8a 318
maclobdell 0:f7c60d3e7b8a 319 params->tag = **p;
maclobdell 0:f7c60d3e7b8a 320 (*p)++;
maclobdell 0:f7c60d3e7b8a 321
maclobdell 0:f7c60d3e7b8a 322 if( ( ret = mbedtls_asn1_get_len( p, end, &params->len ) ) != 0 )
maclobdell 0:f7c60d3e7b8a 323 return( ret );
maclobdell 0:f7c60d3e7b8a 324
maclobdell 0:f7c60d3e7b8a 325 params->p = *p;
maclobdell 0:f7c60d3e7b8a 326 *p += params->len;
maclobdell 0:f7c60d3e7b8a 327
maclobdell 0:f7c60d3e7b8a 328 if( *p != end )
maclobdell 0:f7c60d3e7b8a 329 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
maclobdell 0:f7c60d3e7b8a 330
maclobdell 0:f7c60d3e7b8a 331 return( 0 );
maclobdell 0:f7c60d3e7b8a 332 }
maclobdell 0:f7c60d3e7b8a 333
maclobdell 0:f7c60d3e7b8a 334 int mbedtls_asn1_get_alg_null( unsigned char **p,
maclobdell 0:f7c60d3e7b8a 335 const unsigned char *end,
maclobdell 0:f7c60d3e7b8a 336 mbedtls_asn1_buf *alg )
maclobdell 0:f7c60d3e7b8a 337 {
maclobdell 0:f7c60d3e7b8a 338 int ret;
maclobdell 0:f7c60d3e7b8a 339 mbedtls_asn1_buf params;
maclobdell 0:f7c60d3e7b8a 340
maclobdell 0:f7c60d3e7b8a 341 memset( &params, 0, sizeof(mbedtls_asn1_buf) );
maclobdell 0:f7c60d3e7b8a 342
maclobdell 0:f7c60d3e7b8a 343 if( ( ret = mbedtls_asn1_get_alg( p, end, alg, &params ) ) != 0 )
maclobdell 0:f7c60d3e7b8a 344 return( ret );
maclobdell 0:f7c60d3e7b8a 345
maclobdell 0:f7c60d3e7b8a 346 if( ( params.tag != MBEDTLS_ASN1_NULL && params.tag != 0 ) || params.len != 0 )
maclobdell 0:f7c60d3e7b8a 347 return( MBEDTLS_ERR_ASN1_INVALID_DATA );
maclobdell 0:f7c60d3e7b8a 348
maclobdell 0:f7c60d3e7b8a 349 return( 0 );
maclobdell 0:f7c60d3e7b8a 350 }
maclobdell 0:f7c60d3e7b8a 351
maclobdell 0:f7c60d3e7b8a 352 void mbedtls_asn1_free_named_data( mbedtls_asn1_named_data *cur )
maclobdell 0:f7c60d3e7b8a 353 {
maclobdell 0:f7c60d3e7b8a 354 if( cur == NULL )
maclobdell 0:f7c60d3e7b8a 355 return;
maclobdell 0:f7c60d3e7b8a 356
maclobdell 0:f7c60d3e7b8a 357 mbedtls_free( cur->oid.p );
maclobdell 0:f7c60d3e7b8a 358 mbedtls_free( cur->val.p );
maclobdell 0:f7c60d3e7b8a 359
maclobdell 0:f7c60d3e7b8a 360 mbedtls_zeroize( cur, sizeof( mbedtls_asn1_named_data ) );
maclobdell 0:f7c60d3e7b8a 361 }
maclobdell 0:f7c60d3e7b8a 362
maclobdell 0:f7c60d3e7b8a 363 void mbedtls_asn1_free_named_data_list( mbedtls_asn1_named_data **head )
maclobdell 0:f7c60d3e7b8a 364 {
maclobdell 0:f7c60d3e7b8a 365 mbedtls_asn1_named_data *cur;
maclobdell 0:f7c60d3e7b8a 366
maclobdell 0:f7c60d3e7b8a 367 while( ( cur = *head ) != NULL )
maclobdell 0:f7c60d3e7b8a 368 {
maclobdell 0:f7c60d3e7b8a 369 *head = cur->next;
maclobdell 0:f7c60d3e7b8a 370 mbedtls_asn1_free_named_data( cur );
maclobdell 0:f7c60d3e7b8a 371 mbedtls_free( cur );
maclobdell 0:f7c60d3e7b8a 372 }
maclobdell 0:f7c60d3e7b8a 373 }
maclobdell 0:f7c60d3e7b8a 374
maclobdell 0:f7c60d3e7b8a 375 mbedtls_asn1_named_data *mbedtls_asn1_find_named_data( mbedtls_asn1_named_data *list,
maclobdell 0:f7c60d3e7b8a 376 const char *oid, size_t len )
maclobdell 0:f7c60d3e7b8a 377 {
maclobdell 0:f7c60d3e7b8a 378 while( list != NULL )
maclobdell 0:f7c60d3e7b8a 379 {
maclobdell 0:f7c60d3e7b8a 380 if( list->oid.len == len &&
maclobdell 0:f7c60d3e7b8a 381 memcmp( list->oid.p, oid, len ) == 0 )
maclobdell 0:f7c60d3e7b8a 382 {
maclobdell 0:f7c60d3e7b8a 383 break;
maclobdell 0:f7c60d3e7b8a 384 }
maclobdell 0:f7c60d3e7b8a 385
maclobdell 0:f7c60d3e7b8a 386 list = list->next;
maclobdell 0:f7c60d3e7b8a 387 }
maclobdell 0:f7c60d3e7b8a 388
maclobdell 0:f7c60d3e7b8a 389 return( list );
maclobdell 0:f7c60d3e7b8a 390 }
maclobdell 0:f7c60d3e7b8a 391
maclobdell 0:f7c60d3e7b8a 392 #endif /* MBEDTLS_ASN1_PARSE_C */