Marco Zecchini / Mbed OS Example_RTOS

Rtos API example

mbed-os/features/mbedtls/src/asn1parse.c@0:9fca2b23d0ba, 2019-02-23 (annotated)

Committer:
marcozecchini
Date:
Sat Feb 23 12:13:36 2019 +0000
Revision:
0:9fca2b23d0ba
final commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
marcozecchini 0:9fca2b23d0ba 1 /*
marcozecchini 0:9fca2b23d0ba 2 * Generic ASN.1 parsing
marcozecchini 0:9fca2b23d0ba 3 *
marcozecchini 0:9fca2b23d0ba 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
marcozecchini 0:9fca2b23d0ba 5 * SPDX-License-Identifier: Apache-2.0
marcozecchini 0:9fca2b23d0ba 6 *
marcozecchini 0:9fca2b23d0ba 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
marcozecchini 0:9fca2b23d0ba 8 * not use this file except in compliance with the License.
marcozecchini 0:9fca2b23d0ba 9 * You may obtain a copy of the License at
marcozecchini 0:9fca2b23d0ba 10 *
marcozecchini 0:9fca2b23d0ba 11 * http://www.apache.org/licenses/LICENSE-2.0
marcozecchini 0:9fca2b23d0ba 12 *
marcozecchini 0:9fca2b23d0ba 13 * Unless required by applicable law or agreed to in writing, software
marcozecchini 0:9fca2b23d0ba 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
marcozecchini 0:9fca2b23d0ba 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
marcozecchini 0:9fca2b23d0ba 16 * See the License for the specific language governing permissions and
marcozecchini 0:9fca2b23d0ba 17 * limitations under the License.
marcozecchini 0:9fca2b23d0ba 18 *
marcozecchini 0:9fca2b23d0ba 19 * This file is part of mbed TLS (https://tls.mbed.org)
marcozecchini 0:9fca2b23d0ba 20 */
marcozecchini 0:9fca2b23d0ba 21
marcozecchini 0:9fca2b23d0ba 22 #if !defined(MBEDTLS_CONFIG_FILE)
marcozecchini 0:9fca2b23d0ba 23 #include "mbedtls/config.h"
marcozecchini 0:9fca2b23d0ba 24 #else
marcozecchini 0:9fca2b23d0ba 25 #include MBEDTLS_CONFIG_FILE
marcozecchini 0:9fca2b23d0ba 26 #endif
marcozecchini 0:9fca2b23d0ba 27
marcozecchini 0:9fca2b23d0ba 28 #if defined(MBEDTLS_ASN1_PARSE_C)
marcozecchini 0:9fca2b23d0ba 29
marcozecchini 0:9fca2b23d0ba 30 #include "mbedtls/asn1.h"
marcozecchini 0:9fca2b23d0ba 31
marcozecchini 0:9fca2b23d0ba 32 #include <string.h>
marcozecchini 0:9fca2b23d0ba 33
marcozecchini 0:9fca2b23d0ba 34 #if defined(MBEDTLS_BIGNUM_C)
marcozecchini 0:9fca2b23d0ba 35 #include "mbedtls/bignum.h"
marcozecchini 0:9fca2b23d0ba 36 #endif
marcozecchini 0:9fca2b23d0ba 37
marcozecchini 0:9fca2b23d0ba 38 #if defined(MBEDTLS_PLATFORM_C)
marcozecchini 0:9fca2b23d0ba 39 #include "mbedtls/platform.h"
marcozecchini 0:9fca2b23d0ba 40 #else
marcozecchini 0:9fca2b23d0ba 41 #include <stdlib.h>
marcozecchini 0:9fca2b23d0ba 42 #define mbedtls_calloc calloc
marcozecchini 0:9fca2b23d0ba 43 #define mbedtls_free free
marcozecchini 0:9fca2b23d0ba 44 #endif
marcozecchini 0:9fca2b23d0ba 45
marcozecchini 0:9fca2b23d0ba 46 /* Implementation that should never be optimized out by the compiler */
marcozecchini 0:9fca2b23d0ba 47 static void mbedtls_zeroize( void *v, size_t n ) {
marcozecchini 0:9fca2b23d0ba 48 volatile unsigned char *p = (unsigned char*)v; while( n-- ) *p++ = 0;
marcozecchini 0:9fca2b23d0ba 49 }
marcozecchini 0:9fca2b23d0ba 50
marcozecchini 0:9fca2b23d0ba 51 /*
marcozecchini 0:9fca2b23d0ba 52 * ASN.1 DER decoding routines
marcozecchini 0:9fca2b23d0ba 53 */
marcozecchini 0:9fca2b23d0ba 54 int mbedtls_asn1_get_len( unsigned char **p,
marcozecchini 0:9fca2b23d0ba 55 const unsigned char *end,
marcozecchini 0:9fca2b23d0ba 56 size_t *len )
marcozecchini 0:9fca2b23d0ba 57 {
marcozecchini 0:9fca2b23d0ba 58 if( ( end - *p ) < 1 )
marcozecchini 0:9fca2b23d0ba 59 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
marcozecchini 0:9fca2b23d0ba 60
marcozecchini 0:9fca2b23d0ba 61 if( ( **p & 0x80 ) == 0 )
marcozecchini 0:9fca2b23d0ba 62 *len = *(*p)++;
marcozecchini 0:9fca2b23d0ba 63 else
marcozecchini 0:9fca2b23d0ba 64 {
marcozecchini 0:9fca2b23d0ba 65 switch( **p & 0x7F )
marcozecchini 0:9fca2b23d0ba 66 {
marcozecchini 0:9fca2b23d0ba 67 case 1:
marcozecchini 0:9fca2b23d0ba 68 if( ( end - *p ) < 2 )
marcozecchini 0:9fca2b23d0ba 69 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
marcozecchini 0:9fca2b23d0ba 70
marcozecchini 0:9fca2b23d0ba 71 *len = (*p)[1];
marcozecchini 0:9fca2b23d0ba 72 (*p) += 2;
marcozecchini 0:9fca2b23d0ba 73 break;
marcozecchini 0:9fca2b23d0ba 74
marcozecchini 0:9fca2b23d0ba 75 case 2:
marcozecchini 0:9fca2b23d0ba 76 if( ( end - *p ) < 3 )
marcozecchini 0:9fca2b23d0ba 77 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
marcozecchini 0:9fca2b23d0ba 78
marcozecchini 0:9fca2b23d0ba 79 *len = ( (size_t)(*p)[1] << 8 ) | (*p)[2];
marcozecchini 0:9fca2b23d0ba 80 (*p) += 3;
marcozecchini 0:9fca2b23d0ba 81 break;
marcozecchini 0:9fca2b23d0ba 82
marcozecchini 0:9fca2b23d0ba 83 case 3:
marcozecchini 0:9fca2b23d0ba 84 if( ( end - *p ) < 4 )
marcozecchini 0:9fca2b23d0ba 85 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
marcozecchini 0:9fca2b23d0ba 86
marcozecchini 0:9fca2b23d0ba 87 *len = ( (size_t)(*p)[1] << 16 ) |
marcozecchini 0:9fca2b23d0ba 88 ( (size_t)(*p)[2] << 8 ) | (*p)[3];
marcozecchini 0:9fca2b23d0ba 89 (*p) += 4;
marcozecchini 0:9fca2b23d0ba 90 break;
marcozecchini 0:9fca2b23d0ba 91
marcozecchini 0:9fca2b23d0ba 92 case 4:
marcozecchini 0:9fca2b23d0ba 93 if( ( end - *p ) < 5 )
marcozecchini 0:9fca2b23d0ba 94 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
marcozecchini 0:9fca2b23d0ba 95
marcozecchini 0:9fca2b23d0ba 96 *len = ( (size_t)(*p)[1] << 24 ) | ( (size_t)(*p)[2] << 16 ) |
marcozecchini 0:9fca2b23d0ba 97 ( (size_t)(*p)[3] << 8 ) | (*p)[4];
marcozecchini 0:9fca2b23d0ba 98 (*p) += 5;
marcozecchini 0:9fca2b23d0ba 99 break;
marcozecchini 0:9fca2b23d0ba 100
marcozecchini 0:9fca2b23d0ba 101 default:
marcozecchini 0:9fca2b23d0ba 102 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
marcozecchini 0:9fca2b23d0ba 103 }
marcozecchini 0:9fca2b23d0ba 104 }
marcozecchini 0:9fca2b23d0ba 105
marcozecchini 0:9fca2b23d0ba 106 if( *len > (size_t) ( end - *p ) )
marcozecchini 0:9fca2b23d0ba 107 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
marcozecchini 0:9fca2b23d0ba 108
marcozecchini 0:9fca2b23d0ba 109 return( 0 );
marcozecchini 0:9fca2b23d0ba 110 }
marcozecchini 0:9fca2b23d0ba 111
marcozecchini 0:9fca2b23d0ba 112 int mbedtls_asn1_get_tag( unsigned char **p,
marcozecchini 0:9fca2b23d0ba 113 const unsigned char *end,
marcozecchini 0:9fca2b23d0ba 114 size_t *len, int tag )
marcozecchini 0:9fca2b23d0ba 115 {
marcozecchini 0:9fca2b23d0ba 116 if( ( end - *p ) < 1 )
marcozecchini 0:9fca2b23d0ba 117 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
marcozecchini 0:9fca2b23d0ba 118
marcozecchini 0:9fca2b23d0ba 119 if( **p != tag )
marcozecchini 0:9fca2b23d0ba 120 return( MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
marcozecchini 0:9fca2b23d0ba 121
marcozecchini 0:9fca2b23d0ba 122 (*p)++;
marcozecchini 0:9fca2b23d0ba 123
marcozecchini 0:9fca2b23d0ba 124 return( mbedtls_asn1_get_len( p, end, len ) );
marcozecchini 0:9fca2b23d0ba 125 }
marcozecchini 0:9fca2b23d0ba 126
marcozecchini 0:9fca2b23d0ba 127 int mbedtls_asn1_get_bool( unsigned char **p,
marcozecchini 0:9fca2b23d0ba 128 const unsigned char *end,
marcozecchini 0:9fca2b23d0ba 129 int *val )
marcozecchini 0:9fca2b23d0ba 130 {
marcozecchini 0:9fca2b23d0ba 131 int ret;
marcozecchini 0:9fca2b23d0ba 132 size_t len;
marcozecchini 0:9fca2b23d0ba 133
marcozecchini 0:9fca2b23d0ba 134 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_BOOLEAN ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 135 return( ret );
marcozecchini 0:9fca2b23d0ba 136
marcozecchini 0:9fca2b23d0ba 137 if( len != 1 )
marcozecchini 0:9fca2b23d0ba 138 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
marcozecchini 0:9fca2b23d0ba 139
marcozecchini 0:9fca2b23d0ba 140 *val = ( **p != 0 ) ? 1 : 0;
marcozecchini 0:9fca2b23d0ba 141 (*p)++;
marcozecchini 0:9fca2b23d0ba 142
marcozecchini 0:9fca2b23d0ba 143 return( 0 );
marcozecchini 0:9fca2b23d0ba 144 }
marcozecchini 0:9fca2b23d0ba 145
marcozecchini 0:9fca2b23d0ba 146 int mbedtls_asn1_get_int( unsigned char **p,
marcozecchini 0:9fca2b23d0ba 147 const unsigned char *end,
marcozecchini 0:9fca2b23d0ba 148 int *val )
marcozecchini 0:9fca2b23d0ba 149 {
marcozecchini 0:9fca2b23d0ba 150 int ret;
marcozecchini 0:9fca2b23d0ba 151 size_t len;
marcozecchini 0:9fca2b23d0ba 152
marcozecchini 0:9fca2b23d0ba 153 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 154 return( ret );
marcozecchini 0:9fca2b23d0ba 155
marcozecchini 0:9fca2b23d0ba 156 if( len == 0 || len > sizeof( int ) || ( **p & 0x80 ) != 0 )
marcozecchini 0:9fca2b23d0ba 157 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
marcozecchini 0:9fca2b23d0ba 158
marcozecchini 0:9fca2b23d0ba 159 *val = 0;
marcozecchini 0:9fca2b23d0ba 160
marcozecchini 0:9fca2b23d0ba 161 while( len-- > 0 )
marcozecchini 0:9fca2b23d0ba 162 {
marcozecchini 0:9fca2b23d0ba 163 *val = ( *val << 8 ) | **p;
marcozecchini 0:9fca2b23d0ba 164 (*p)++;
marcozecchini 0:9fca2b23d0ba 165 }
marcozecchini 0:9fca2b23d0ba 166
marcozecchini 0:9fca2b23d0ba 167 return( 0 );
marcozecchini 0:9fca2b23d0ba 168 }
marcozecchini 0:9fca2b23d0ba 169
marcozecchini 0:9fca2b23d0ba 170 #if defined(MBEDTLS_BIGNUM_C)
marcozecchini 0:9fca2b23d0ba 171 int mbedtls_asn1_get_mpi( unsigned char **p,
marcozecchini 0:9fca2b23d0ba 172 const unsigned char *end,
marcozecchini 0:9fca2b23d0ba 173 mbedtls_mpi *X )
marcozecchini 0:9fca2b23d0ba 174 {
marcozecchini 0:9fca2b23d0ba 175 int ret;
marcozecchini 0:9fca2b23d0ba 176 size_t len;
marcozecchini 0:9fca2b23d0ba 177
marcozecchini 0:9fca2b23d0ba 178 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 179 return( ret );
marcozecchini 0:9fca2b23d0ba 180
marcozecchini 0:9fca2b23d0ba 181 ret = mbedtls_mpi_read_binary( X, *p, len );
marcozecchini 0:9fca2b23d0ba 182
marcozecchini 0:9fca2b23d0ba 183 *p += len;
marcozecchini 0:9fca2b23d0ba 184
marcozecchini 0:9fca2b23d0ba 185 return( ret );
marcozecchini 0:9fca2b23d0ba 186 }
marcozecchini 0:9fca2b23d0ba 187 #endif /* MBEDTLS_BIGNUM_C */
marcozecchini 0:9fca2b23d0ba 188
marcozecchini 0:9fca2b23d0ba 189 int mbedtls_asn1_get_bitstring( unsigned char **p, const unsigned char *end,
marcozecchini 0:9fca2b23d0ba 190 mbedtls_asn1_bitstring *bs)
marcozecchini 0:9fca2b23d0ba 191 {
marcozecchini 0:9fca2b23d0ba 192 int ret;
marcozecchini 0:9fca2b23d0ba 193
marcozecchini 0:9fca2b23d0ba 194 /* Certificate type is a single byte bitstring */
marcozecchini 0:9fca2b23d0ba 195 if( ( ret = mbedtls_asn1_get_tag( p, end, &bs->len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 196 return( ret );
marcozecchini 0:9fca2b23d0ba 197
marcozecchini 0:9fca2b23d0ba 198 /* Check length, subtract one for actual bit string length */
marcozecchini 0:9fca2b23d0ba 199 if( bs->len < 1 )
marcozecchini 0:9fca2b23d0ba 200 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
marcozecchini 0:9fca2b23d0ba 201 bs->len -= 1;
marcozecchini 0:9fca2b23d0ba 202
marcozecchini 0:9fca2b23d0ba 203 /* Get number of unused bits, ensure unused bits <= 7 */
marcozecchini 0:9fca2b23d0ba 204 bs->unused_bits = **p;
marcozecchini 0:9fca2b23d0ba 205 if( bs->unused_bits > 7 )
marcozecchini 0:9fca2b23d0ba 206 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
marcozecchini 0:9fca2b23d0ba 207 (*p)++;
marcozecchini 0:9fca2b23d0ba 208
marcozecchini 0:9fca2b23d0ba 209 /* Get actual bitstring */
marcozecchini 0:9fca2b23d0ba 210 bs->p = *p;
marcozecchini 0:9fca2b23d0ba 211 *p += bs->len;
marcozecchini 0:9fca2b23d0ba 212
marcozecchini 0:9fca2b23d0ba 213 if( *p != end )
marcozecchini 0:9fca2b23d0ba 214 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
marcozecchini 0:9fca2b23d0ba 215
marcozecchini 0:9fca2b23d0ba 216 return( 0 );
marcozecchini 0:9fca2b23d0ba 217 }
marcozecchini 0:9fca2b23d0ba 218
marcozecchini 0:9fca2b23d0ba 219 /*
marcozecchini 0:9fca2b23d0ba 220 * Get a bit string without unused bits
marcozecchini 0:9fca2b23d0ba 221 */
marcozecchini 0:9fca2b23d0ba 222 int mbedtls_asn1_get_bitstring_null( unsigned char **p, const unsigned char *end,
marcozecchini 0:9fca2b23d0ba 223 size_t *len )
marcozecchini 0:9fca2b23d0ba 224 {
marcozecchini 0:9fca2b23d0ba 225 int ret;
marcozecchini 0:9fca2b23d0ba 226
marcozecchini 0:9fca2b23d0ba 227 if( ( ret = mbedtls_asn1_get_tag( p, end, len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 228 return( ret );
marcozecchini 0:9fca2b23d0ba 229
marcozecchini 0:9fca2b23d0ba 230 if( (*len)-- < 2 || *(*p)++ != 0 )
marcozecchini 0:9fca2b23d0ba 231 return( MBEDTLS_ERR_ASN1_INVALID_DATA );
marcozecchini 0:9fca2b23d0ba 232
marcozecchini 0:9fca2b23d0ba 233 return( 0 );
marcozecchini 0:9fca2b23d0ba 234 }
marcozecchini 0:9fca2b23d0ba 235
marcozecchini 0:9fca2b23d0ba 236
marcozecchini 0:9fca2b23d0ba 237
marcozecchini 0:9fca2b23d0ba 238 /*
marcozecchini 0:9fca2b23d0ba 239 * Parses and splits an ASN.1 "SEQUENCE OF <tag>"
marcozecchini 0:9fca2b23d0ba 240 */
marcozecchini 0:9fca2b23d0ba 241 int mbedtls_asn1_get_sequence_of( unsigned char **p,
marcozecchini 0:9fca2b23d0ba 242 const unsigned char *end,
marcozecchini 0:9fca2b23d0ba 243 mbedtls_asn1_sequence *cur,
marcozecchini 0:9fca2b23d0ba 244 int tag)
marcozecchini 0:9fca2b23d0ba 245 {
marcozecchini 0:9fca2b23d0ba 246 int ret;
marcozecchini 0:9fca2b23d0ba 247 size_t len;
marcozecchini 0:9fca2b23d0ba 248 mbedtls_asn1_buf *buf;
marcozecchini 0:9fca2b23d0ba 249
marcozecchini 0:9fca2b23d0ba 250 /* Get main sequence tag */
marcozecchini 0:9fca2b23d0ba 251 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
marcozecchini 0:9fca2b23d0ba 252 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 253 return( ret );
marcozecchini 0:9fca2b23d0ba 254
marcozecchini 0:9fca2b23d0ba 255 if( *p + len != end )
marcozecchini 0:9fca2b23d0ba 256 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
marcozecchini 0:9fca2b23d0ba 257
marcozecchini 0:9fca2b23d0ba 258 while( *p < end )
marcozecchini 0:9fca2b23d0ba 259 {
marcozecchini 0:9fca2b23d0ba 260 buf = &(cur->buf);
marcozecchini 0:9fca2b23d0ba 261 buf->tag = **p;
marcozecchini 0:9fca2b23d0ba 262
marcozecchini 0:9fca2b23d0ba 263 if( ( ret = mbedtls_asn1_get_tag( p, end, &buf->len, tag ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 264 return( ret );
marcozecchini 0:9fca2b23d0ba 265
marcozecchini 0:9fca2b23d0ba 266 buf->p = *p;
marcozecchini 0:9fca2b23d0ba 267 *p += buf->len;
marcozecchini 0:9fca2b23d0ba 268
marcozecchini 0:9fca2b23d0ba 269 /* Allocate and assign next pointer */
marcozecchini 0:9fca2b23d0ba 270 if( *p < end )
marcozecchini 0:9fca2b23d0ba 271 {
marcozecchini 0:9fca2b23d0ba 272 cur->next = (mbedtls_asn1_sequence*)mbedtls_calloc( 1,
marcozecchini 0:9fca2b23d0ba 273 sizeof( mbedtls_asn1_sequence ) );
marcozecchini 0:9fca2b23d0ba 274
marcozecchini 0:9fca2b23d0ba 275 if( cur->next == NULL )
marcozecchini 0:9fca2b23d0ba 276 return( MBEDTLS_ERR_ASN1_ALLOC_FAILED );
marcozecchini 0:9fca2b23d0ba 277
marcozecchini 0:9fca2b23d0ba 278 cur = cur->next;
marcozecchini 0:9fca2b23d0ba 279 }
marcozecchini 0:9fca2b23d0ba 280 }
marcozecchini 0:9fca2b23d0ba 281
marcozecchini 0:9fca2b23d0ba 282 /* Set final sequence entry's next pointer to NULL */
marcozecchini 0:9fca2b23d0ba 283 cur->next = NULL;
marcozecchini 0:9fca2b23d0ba 284
marcozecchini 0:9fca2b23d0ba 285 if( *p != end )
marcozecchini 0:9fca2b23d0ba 286 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
marcozecchini 0:9fca2b23d0ba 287
marcozecchini 0:9fca2b23d0ba 288 return( 0 );
marcozecchini 0:9fca2b23d0ba 289 }
marcozecchini 0:9fca2b23d0ba 290
marcozecchini 0:9fca2b23d0ba 291 int mbedtls_asn1_get_alg( unsigned char **p,
marcozecchini 0:9fca2b23d0ba 292 const unsigned char *end,
marcozecchini 0:9fca2b23d0ba 293 mbedtls_asn1_buf *alg, mbedtls_asn1_buf *params )
marcozecchini 0:9fca2b23d0ba 294 {
marcozecchini 0:9fca2b23d0ba 295 int ret;
marcozecchini 0:9fca2b23d0ba 296 size_t len;
marcozecchini 0:9fca2b23d0ba 297
marcozecchini 0:9fca2b23d0ba 298 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
marcozecchini 0:9fca2b23d0ba 299 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 300 return( ret );
marcozecchini 0:9fca2b23d0ba 301
marcozecchini 0:9fca2b23d0ba 302 if( ( end - *p ) < 1 )
marcozecchini 0:9fca2b23d0ba 303 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
marcozecchini 0:9fca2b23d0ba 304
marcozecchini 0:9fca2b23d0ba 305 alg->tag = **p;
marcozecchini 0:9fca2b23d0ba 306 end = *p + len;
marcozecchini 0:9fca2b23d0ba 307
marcozecchini 0:9fca2b23d0ba 308 if( ( ret = mbedtls_asn1_get_tag( p, end, &alg->len, MBEDTLS_ASN1_OID ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 309 return( ret );
marcozecchini 0:9fca2b23d0ba 310
marcozecchini 0:9fca2b23d0ba 311 alg->p = *p;
marcozecchini 0:9fca2b23d0ba 312 *p += alg->len;
marcozecchini 0:9fca2b23d0ba 313
marcozecchini 0:9fca2b23d0ba 314 if( *p == end )
marcozecchini 0:9fca2b23d0ba 315 {
marcozecchini 0:9fca2b23d0ba 316 mbedtls_zeroize( params, sizeof(mbedtls_asn1_buf) );
marcozecchini 0:9fca2b23d0ba 317 return( 0 );
marcozecchini 0:9fca2b23d0ba 318 }
marcozecchini 0:9fca2b23d0ba 319
marcozecchini 0:9fca2b23d0ba 320 params->tag = **p;
marcozecchini 0:9fca2b23d0ba 321 (*p)++;
marcozecchini 0:9fca2b23d0ba 322
marcozecchini 0:9fca2b23d0ba 323 if( ( ret = mbedtls_asn1_get_len( p, end, &params->len ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 324 return( ret );
marcozecchini 0:9fca2b23d0ba 325
marcozecchini 0:9fca2b23d0ba 326 params->p = *p;
marcozecchini 0:9fca2b23d0ba 327 *p += params->len;
marcozecchini 0:9fca2b23d0ba 328
marcozecchini 0:9fca2b23d0ba 329 if( *p != end )
marcozecchini 0:9fca2b23d0ba 330 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
marcozecchini 0:9fca2b23d0ba 331
marcozecchini 0:9fca2b23d0ba 332 return( 0 );
marcozecchini 0:9fca2b23d0ba 333 }
marcozecchini 0:9fca2b23d0ba 334
marcozecchini 0:9fca2b23d0ba 335 int mbedtls_asn1_get_alg_null( unsigned char **p,
marcozecchini 0:9fca2b23d0ba 336 const unsigned char *end,
marcozecchini 0:9fca2b23d0ba 337 mbedtls_asn1_buf *alg )
marcozecchini 0:9fca2b23d0ba 338 {
marcozecchini 0:9fca2b23d0ba 339 int ret;
marcozecchini 0:9fca2b23d0ba 340 mbedtls_asn1_buf params;
marcozecchini 0:9fca2b23d0ba 341
marcozecchini 0:9fca2b23d0ba 342 memset( &params, 0, sizeof(mbedtls_asn1_buf) );
marcozecchini 0:9fca2b23d0ba 343
marcozecchini 0:9fca2b23d0ba 344 if( ( ret = mbedtls_asn1_get_alg( p, end, alg, &params ) ) != 0 )
marcozecchini 0:9fca2b23d0ba 345 return( ret );
marcozecchini 0:9fca2b23d0ba 346
marcozecchini 0:9fca2b23d0ba 347 if( ( params.tag != MBEDTLS_ASN1_NULL && params.tag != 0 ) || params.len != 0 )
marcozecchini 0:9fca2b23d0ba 348 return( MBEDTLS_ERR_ASN1_INVALID_DATA );
marcozecchini 0:9fca2b23d0ba 349
marcozecchini 0:9fca2b23d0ba 350 return( 0 );
marcozecchini 0:9fca2b23d0ba 351 }
marcozecchini 0:9fca2b23d0ba 352
marcozecchini 0:9fca2b23d0ba 353 void mbedtls_asn1_free_named_data( mbedtls_asn1_named_data *cur )
marcozecchini 0:9fca2b23d0ba 354 {
marcozecchini 0:9fca2b23d0ba 355 if( cur == NULL )
marcozecchini 0:9fca2b23d0ba 356 return;
marcozecchini 0:9fca2b23d0ba 357
marcozecchini 0:9fca2b23d0ba 358 mbedtls_free( cur->oid.p );
marcozecchini 0:9fca2b23d0ba 359 mbedtls_free( cur->val.p );
marcozecchini 0:9fca2b23d0ba 360
marcozecchini 0:9fca2b23d0ba 361 mbedtls_zeroize( cur, sizeof( mbedtls_asn1_named_data ) );
marcozecchini 0:9fca2b23d0ba 362 }
marcozecchini 0:9fca2b23d0ba 363
marcozecchini 0:9fca2b23d0ba 364 void mbedtls_asn1_free_named_data_list( mbedtls_asn1_named_data **head )
marcozecchini 0:9fca2b23d0ba 365 {
marcozecchini 0:9fca2b23d0ba 366 mbedtls_asn1_named_data *cur;
marcozecchini 0:9fca2b23d0ba 367
marcozecchini 0:9fca2b23d0ba 368 while( ( cur = *head ) != NULL )
marcozecchini 0:9fca2b23d0ba 369 {
marcozecchini 0:9fca2b23d0ba 370 *head = cur->next;
marcozecchini 0:9fca2b23d0ba 371 mbedtls_asn1_free_named_data( cur );
marcozecchini 0:9fca2b23d0ba 372 mbedtls_free( cur );
marcozecchini 0:9fca2b23d0ba 373 }
marcozecchini 0:9fca2b23d0ba 374 }
marcozecchini 0:9fca2b23d0ba 375
marcozecchini 0:9fca2b23d0ba 376 mbedtls_asn1_named_data *mbedtls_asn1_find_named_data( mbedtls_asn1_named_data *list,
marcozecchini 0:9fca2b23d0ba 377 const char *oid, size_t len )
marcozecchini 0:9fca2b23d0ba 378 {
marcozecchini 0:9fca2b23d0ba 379 while( list != NULL )
marcozecchini 0:9fca2b23d0ba 380 {
marcozecchini 0:9fca2b23d0ba 381 if( list->oid.len == len &&
marcozecchini 0:9fca2b23d0ba 382 memcmp( list->oid.p, oid, len ) == 0 )
marcozecchini 0:9fca2b23d0ba 383 {
marcozecchini 0:9fca2b23d0ba 384 break;
marcozecchini 0:9fca2b23d0ba 385 }
marcozecchini 0:9fca2b23d0ba 386
marcozecchini 0:9fca2b23d0ba 387 list = list->next;
marcozecchini 0:9fca2b23d0ba 388 }
marcozecchini 0:9fca2b23d0ba 389
marcozecchini 0:9fca2b23d0ba 390 return( list );
marcozecchini 0:9fca2b23d0ba 391 }
marcozecchini 0:9fca2b23d0ba 392
marcozecchini 0:9fca2b23d0ba 393 #endif /* MBEDTLS_ASN1_PARSE_C */