Rahul Dahiya / Mbed OS STM32F7 Ethernet

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mbed-os/features/mbedtls/src/asn1parse.c@0:fb8047b156bb, 2020-01-15 (annotated)

Committer:
rahul_dahiya
Date:
Wed Jan 15 15:57:15 2020 +0530
Revision:
0:fb8047b156bb
STM32F7 LWIP

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rahul_dahiya 0:fb8047b156bb 1 /*
rahul_dahiya 0:fb8047b156bb 2 * Generic ASN.1 parsing
rahul_dahiya 0:fb8047b156bb 3 *
rahul_dahiya 0:fb8047b156bb 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
rahul_dahiya 0:fb8047b156bb 5 * SPDX-License-Identifier: Apache-2.0
rahul_dahiya 0:fb8047b156bb 6 *
rahul_dahiya 0:fb8047b156bb 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
rahul_dahiya 0:fb8047b156bb 8 * not use this file except in compliance with the License.
rahul_dahiya 0:fb8047b156bb 9 * You may obtain a copy of the License at
rahul_dahiya 0:fb8047b156bb 10 *
rahul_dahiya 0:fb8047b156bb 11 * http://www.apache.org/licenses/LICENSE-2.0
rahul_dahiya 0:fb8047b156bb 12 *
rahul_dahiya 0:fb8047b156bb 13 * Unless required by applicable law or agreed to in writing, software
rahul_dahiya 0:fb8047b156bb 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
rahul_dahiya 0:fb8047b156bb 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
rahul_dahiya 0:fb8047b156bb 16 * See the License for the specific language governing permissions and
rahul_dahiya 0:fb8047b156bb 17 * limitations under the License.
rahul_dahiya 0:fb8047b156bb 18 *
rahul_dahiya 0:fb8047b156bb 19 * This file is part of mbed TLS (https://tls.mbed.org)
rahul_dahiya 0:fb8047b156bb 20 */
rahul_dahiya 0:fb8047b156bb 21
rahul_dahiya 0:fb8047b156bb 22 #if !defined(MBEDTLS_CONFIG_FILE)
rahul_dahiya 0:fb8047b156bb 23 #include "mbedtls/config.h"
rahul_dahiya 0:fb8047b156bb 24 #else
rahul_dahiya 0:fb8047b156bb 25 #include MBEDTLS_CONFIG_FILE
rahul_dahiya 0:fb8047b156bb 26 #endif
rahul_dahiya 0:fb8047b156bb 27
rahul_dahiya 0:fb8047b156bb 28 #if defined(MBEDTLS_ASN1_PARSE_C)
rahul_dahiya 0:fb8047b156bb 29
rahul_dahiya 0:fb8047b156bb 30 #include "mbedtls/asn1.h"
rahul_dahiya 0:fb8047b156bb 31
rahul_dahiya 0:fb8047b156bb 32 #include <string.h>
rahul_dahiya 0:fb8047b156bb 33
rahul_dahiya 0:fb8047b156bb 34 #if defined(MBEDTLS_BIGNUM_C)
rahul_dahiya 0:fb8047b156bb 35 #include "mbedtls/bignum.h"
rahul_dahiya 0:fb8047b156bb 36 #endif
rahul_dahiya 0:fb8047b156bb 37
rahul_dahiya 0:fb8047b156bb 38 #if defined(MBEDTLS_PLATFORM_C)
rahul_dahiya 0:fb8047b156bb 39 #include "mbedtls/platform.h"
rahul_dahiya 0:fb8047b156bb 40 #else
rahul_dahiya 0:fb8047b156bb 41 #include <stdlib.h>
rahul_dahiya 0:fb8047b156bb 42 #define mbedtls_calloc calloc
rahul_dahiya 0:fb8047b156bb 43 #define mbedtls_free free
rahul_dahiya 0:fb8047b156bb 44 #endif
rahul_dahiya 0:fb8047b156bb 45
rahul_dahiya 0:fb8047b156bb 46 /* Implementation that should never be optimized out by the compiler */
rahul_dahiya 0:fb8047b156bb 47 static void mbedtls_zeroize( void *v, size_t n ) {
rahul_dahiya 0:fb8047b156bb 48 volatile unsigned char *p = (unsigned char*)v; while( n-- ) *p++ = 0;
rahul_dahiya 0:fb8047b156bb 49 }
rahul_dahiya 0:fb8047b156bb 50
rahul_dahiya 0:fb8047b156bb 51 /*
rahul_dahiya 0:fb8047b156bb 52 * ASN.1 DER decoding routines
rahul_dahiya 0:fb8047b156bb 53 */
rahul_dahiya 0:fb8047b156bb 54 int mbedtls_asn1_get_len( unsigned char **p,
rahul_dahiya 0:fb8047b156bb 55 const unsigned char *end,
rahul_dahiya 0:fb8047b156bb 56 size_t *len )
rahul_dahiya 0:fb8047b156bb 57 {
rahul_dahiya 0:fb8047b156bb 58 if( ( end - *p ) < 1 )
rahul_dahiya 0:fb8047b156bb 59 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
rahul_dahiya 0:fb8047b156bb 60
rahul_dahiya 0:fb8047b156bb 61 if( ( **p & 0x80 ) == 0 )
rahul_dahiya 0:fb8047b156bb 62 *len = *(*p)++;
rahul_dahiya 0:fb8047b156bb 63 else
rahul_dahiya 0:fb8047b156bb 64 {
rahul_dahiya 0:fb8047b156bb 65 switch( **p & 0x7F )
rahul_dahiya 0:fb8047b156bb 66 {
rahul_dahiya 0:fb8047b156bb 67 case 1:
rahul_dahiya 0:fb8047b156bb 68 if( ( end - *p ) < 2 )
rahul_dahiya 0:fb8047b156bb 69 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
rahul_dahiya 0:fb8047b156bb 70
rahul_dahiya 0:fb8047b156bb 71 *len = (*p)[1];
rahul_dahiya 0:fb8047b156bb 72 (*p) += 2;
rahul_dahiya 0:fb8047b156bb 73 break;
rahul_dahiya 0:fb8047b156bb 74
rahul_dahiya 0:fb8047b156bb 75 case 2:
rahul_dahiya 0:fb8047b156bb 76 if( ( end - *p ) < 3 )
rahul_dahiya 0:fb8047b156bb 77 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
rahul_dahiya 0:fb8047b156bb 78
rahul_dahiya 0:fb8047b156bb 79 *len = ( (size_t)(*p)[1] << 8 ) | (*p)[2];
rahul_dahiya 0:fb8047b156bb 80 (*p) += 3;
rahul_dahiya 0:fb8047b156bb 81 break;
rahul_dahiya 0:fb8047b156bb 82
rahul_dahiya 0:fb8047b156bb 83 case 3:
rahul_dahiya 0:fb8047b156bb 84 if( ( end - *p ) < 4 )
rahul_dahiya 0:fb8047b156bb 85 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
rahul_dahiya 0:fb8047b156bb 86
rahul_dahiya 0:fb8047b156bb 87 *len = ( (size_t)(*p)[1] << 16 ) |
rahul_dahiya 0:fb8047b156bb 88 ( (size_t)(*p)[2] << 8 ) | (*p)[3];
rahul_dahiya 0:fb8047b156bb 89 (*p) += 4;
rahul_dahiya 0:fb8047b156bb 90 break;
rahul_dahiya 0:fb8047b156bb 91
rahul_dahiya 0:fb8047b156bb 92 case 4:
rahul_dahiya 0:fb8047b156bb 93 if( ( end - *p ) < 5 )
rahul_dahiya 0:fb8047b156bb 94 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
rahul_dahiya 0:fb8047b156bb 95
rahul_dahiya 0:fb8047b156bb 96 *len = ( (size_t)(*p)[1] << 24 ) | ( (size_t)(*p)[2] << 16 ) |
rahul_dahiya 0:fb8047b156bb 97 ( (size_t)(*p)[3] << 8 ) | (*p)[4];
rahul_dahiya 0:fb8047b156bb 98 (*p) += 5;
rahul_dahiya 0:fb8047b156bb 99 break;
rahul_dahiya 0:fb8047b156bb 100
rahul_dahiya 0:fb8047b156bb 101 default:
rahul_dahiya 0:fb8047b156bb 102 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
rahul_dahiya 0:fb8047b156bb 103 }
rahul_dahiya 0:fb8047b156bb 104 }
rahul_dahiya 0:fb8047b156bb 105
rahul_dahiya 0:fb8047b156bb 106 if( *len > (size_t) ( end - *p ) )
rahul_dahiya 0:fb8047b156bb 107 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
rahul_dahiya 0:fb8047b156bb 108
rahul_dahiya 0:fb8047b156bb 109 return( 0 );
rahul_dahiya 0:fb8047b156bb 110 }
rahul_dahiya 0:fb8047b156bb 111
rahul_dahiya 0:fb8047b156bb 112 int mbedtls_asn1_get_tag( unsigned char **p,
rahul_dahiya 0:fb8047b156bb 113 const unsigned char *end,
rahul_dahiya 0:fb8047b156bb 114 size_t *len, int tag )
rahul_dahiya 0:fb8047b156bb 115 {
rahul_dahiya 0:fb8047b156bb 116 if( ( end - *p ) < 1 )
rahul_dahiya 0:fb8047b156bb 117 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
rahul_dahiya 0:fb8047b156bb 118
rahul_dahiya 0:fb8047b156bb 119 if( **p != tag )
rahul_dahiya 0:fb8047b156bb 120 return( MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
rahul_dahiya 0:fb8047b156bb 121
rahul_dahiya 0:fb8047b156bb 122 (*p)++;
rahul_dahiya 0:fb8047b156bb 123
rahul_dahiya 0:fb8047b156bb 124 return( mbedtls_asn1_get_len( p, end, len ) );
rahul_dahiya 0:fb8047b156bb 125 }
rahul_dahiya 0:fb8047b156bb 126
rahul_dahiya 0:fb8047b156bb 127 int mbedtls_asn1_get_bool( unsigned char **p,
rahul_dahiya 0:fb8047b156bb 128 const unsigned char *end,
rahul_dahiya 0:fb8047b156bb 129 int *val )
rahul_dahiya 0:fb8047b156bb 130 {
rahul_dahiya 0:fb8047b156bb 131 int ret;
rahul_dahiya 0:fb8047b156bb 132 size_t len;
rahul_dahiya 0:fb8047b156bb 133
rahul_dahiya 0:fb8047b156bb 134 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_BOOLEAN ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 135 return( ret );
rahul_dahiya 0:fb8047b156bb 136
rahul_dahiya 0:fb8047b156bb 137 if( len != 1 )
rahul_dahiya 0:fb8047b156bb 138 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
rahul_dahiya 0:fb8047b156bb 139
rahul_dahiya 0:fb8047b156bb 140 *val = ( **p != 0 ) ? 1 : 0;
rahul_dahiya 0:fb8047b156bb 141 (*p)++;
rahul_dahiya 0:fb8047b156bb 142
rahul_dahiya 0:fb8047b156bb 143 return( 0 );
rahul_dahiya 0:fb8047b156bb 144 }
rahul_dahiya 0:fb8047b156bb 145
rahul_dahiya 0:fb8047b156bb 146 int mbedtls_asn1_get_int( unsigned char **p,
rahul_dahiya 0:fb8047b156bb 147 const unsigned char *end,
rahul_dahiya 0:fb8047b156bb 148 int *val )
rahul_dahiya 0:fb8047b156bb 149 {
rahul_dahiya 0:fb8047b156bb 150 int ret;
rahul_dahiya 0:fb8047b156bb 151 size_t len;
rahul_dahiya 0:fb8047b156bb 152
rahul_dahiya 0:fb8047b156bb 153 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 154 return( ret );
rahul_dahiya 0:fb8047b156bb 155
rahul_dahiya 0:fb8047b156bb 156 if( len == 0 || len > sizeof( int ) || ( **p & 0x80 ) != 0 )
rahul_dahiya 0:fb8047b156bb 157 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
rahul_dahiya 0:fb8047b156bb 158
rahul_dahiya 0:fb8047b156bb 159 *val = 0;
rahul_dahiya 0:fb8047b156bb 160
rahul_dahiya 0:fb8047b156bb 161 while( len-- > 0 )
rahul_dahiya 0:fb8047b156bb 162 {
rahul_dahiya 0:fb8047b156bb 163 *val = ( *val << 8 ) | **p;
rahul_dahiya 0:fb8047b156bb 164 (*p)++;
rahul_dahiya 0:fb8047b156bb 165 }
rahul_dahiya 0:fb8047b156bb 166
rahul_dahiya 0:fb8047b156bb 167 return( 0 );
rahul_dahiya 0:fb8047b156bb 168 }
rahul_dahiya 0:fb8047b156bb 169
rahul_dahiya 0:fb8047b156bb 170 #if defined(MBEDTLS_BIGNUM_C)
rahul_dahiya 0:fb8047b156bb 171 int mbedtls_asn1_get_mpi( unsigned char **p,
rahul_dahiya 0:fb8047b156bb 172 const unsigned char *end,
rahul_dahiya 0:fb8047b156bb 173 mbedtls_mpi *X )
rahul_dahiya 0:fb8047b156bb 174 {
rahul_dahiya 0:fb8047b156bb 175 int ret;
rahul_dahiya 0:fb8047b156bb 176 size_t len;
rahul_dahiya 0:fb8047b156bb 177
rahul_dahiya 0:fb8047b156bb 178 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, MBEDTLS_ASN1_INTEGER ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 179 return( ret );
rahul_dahiya 0:fb8047b156bb 180
rahul_dahiya 0:fb8047b156bb 181 ret = mbedtls_mpi_read_binary( X, *p, len );
rahul_dahiya 0:fb8047b156bb 182
rahul_dahiya 0:fb8047b156bb 183 *p += len;
rahul_dahiya 0:fb8047b156bb 184
rahul_dahiya 0:fb8047b156bb 185 return( ret );
rahul_dahiya 0:fb8047b156bb 186 }
rahul_dahiya 0:fb8047b156bb 187 #endif /* MBEDTLS_BIGNUM_C */
rahul_dahiya 0:fb8047b156bb 188
rahul_dahiya 0:fb8047b156bb 189 int mbedtls_asn1_get_bitstring( unsigned char **p, const unsigned char *end,
rahul_dahiya 0:fb8047b156bb 190 mbedtls_asn1_bitstring *bs)
rahul_dahiya 0:fb8047b156bb 191 {
rahul_dahiya 0:fb8047b156bb 192 int ret;
rahul_dahiya 0:fb8047b156bb 193
rahul_dahiya 0:fb8047b156bb 194 /* Certificate type is a single byte bitstring */
rahul_dahiya 0:fb8047b156bb 195 if( ( ret = mbedtls_asn1_get_tag( p, end, &bs->len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 196 return( ret );
rahul_dahiya 0:fb8047b156bb 197
rahul_dahiya 0:fb8047b156bb 198 /* Check length, subtract one for actual bit string length */
rahul_dahiya 0:fb8047b156bb 199 if( bs->len < 1 )
rahul_dahiya 0:fb8047b156bb 200 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
rahul_dahiya 0:fb8047b156bb 201 bs->len -= 1;
rahul_dahiya 0:fb8047b156bb 202
rahul_dahiya 0:fb8047b156bb 203 /* Get number of unused bits, ensure unused bits <= 7 */
rahul_dahiya 0:fb8047b156bb 204 bs->unused_bits = **p;
rahul_dahiya 0:fb8047b156bb 205 if( bs->unused_bits > 7 )
rahul_dahiya 0:fb8047b156bb 206 return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
rahul_dahiya 0:fb8047b156bb 207 (*p)++;
rahul_dahiya 0:fb8047b156bb 208
rahul_dahiya 0:fb8047b156bb 209 /* Get actual bitstring */
rahul_dahiya 0:fb8047b156bb 210 bs->p = *p;
rahul_dahiya 0:fb8047b156bb 211 *p += bs->len;
rahul_dahiya 0:fb8047b156bb 212
rahul_dahiya 0:fb8047b156bb 213 if( *p != end )
rahul_dahiya 0:fb8047b156bb 214 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
rahul_dahiya 0:fb8047b156bb 215
rahul_dahiya 0:fb8047b156bb 216 return( 0 );
rahul_dahiya 0:fb8047b156bb 217 }
rahul_dahiya 0:fb8047b156bb 218
rahul_dahiya 0:fb8047b156bb 219 /*
rahul_dahiya 0:fb8047b156bb 220 * Get a bit string without unused bits
rahul_dahiya 0:fb8047b156bb 221 */
rahul_dahiya 0:fb8047b156bb 222 int mbedtls_asn1_get_bitstring_null( unsigned char **p, const unsigned char *end,
rahul_dahiya 0:fb8047b156bb 223 size_t *len )
rahul_dahiya 0:fb8047b156bb 224 {
rahul_dahiya 0:fb8047b156bb 225 int ret;
rahul_dahiya 0:fb8047b156bb 226
rahul_dahiya 0:fb8047b156bb 227 if( ( ret = mbedtls_asn1_get_tag( p, end, len, MBEDTLS_ASN1_BIT_STRING ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 228 return( ret );
rahul_dahiya 0:fb8047b156bb 229
rahul_dahiya 0:fb8047b156bb 230 if( (*len)-- < 2 || *(*p)++ != 0 )
rahul_dahiya 0:fb8047b156bb 231 return( MBEDTLS_ERR_ASN1_INVALID_DATA );
rahul_dahiya 0:fb8047b156bb 232
rahul_dahiya 0:fb8047b156bb 233 return( 0 );
rahul_dahiya 0:fb8047b156bb 234 }
rahul_dahiya 0:fb8047b156bb 235
rahul_dahiya 0:fb8047b156bb 236
rahul_dahiya 0:fb8047b156bb 237
rahul_dahiya 0:fb8047b156bb 238 /*
rahul_dahiya 0:fb8047b156bb 239 * Parses and splits an ASN.1 "SEQUENCE OF <tag>"
rahul_dahiya 0:fb8047b156bb 240 */
rahul_dahiya 0:fb8047b156bb 241 int mbedtls_asn1_get_sequence_of( unsigned char **p,
rahul_dahiya 0:fb8047b156bb 242 const unsigned char *end,
rahul_dahiya 0:fb8047b156bb 243 mbedtls_asn1_sequence *cur,
rahul_dahiya 0:fb8047b156bb 244 int tag)
rahul_dahiya 0:fb8047b156bb 245 {
rahul_dahiya 0:fb8047b156bb 246 int ret;
rahul_dahiya 0:fb8047b156bb 247 size_t len;
rahul_dahiya 0:fb8047b156bb 248 mbedtls_asn1_buf *buf;
rahul_dahiya 0:fb8047b156bb 249
rahul_dahiya 0:fb8047b156bb 250 /* Get main sequence tag */
rahul_dahiya 0:fb8047b156bb 251 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
rahul_dahiya 0:fb8047b156bb 252 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 253 return( ret );
rahul_dahiya 0:fb8047b156bb 254
rahul_dahiya 0:fb8047b156bb 255 if( *p + len != end )
rahul_dahiya 0:fb8047b156bb 256 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
rahul_dahiya 0:fb8047b156bb 257
rahul_dahiya 0:fb8047b156bb 258 while( *p < end )
rahul_dahiya 0:fb8047b156bb 259 {
rahul_dahiya 0:fb8047b156bb 260 buf = &(cur->buf);
rahul_dahiya 0:fb8047b156bb 261 buf->tag = **p;
rahul_dahiya 0:fb8047b156bb 262
rahul_dahiya 0:fb8047b156bb 263 if( ( ret = mbedtls_asn1_get_tag( p, end, &buf->len, tag ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 264 return( ret );
rahul_dahiya 0:fb8047b156bb 265
rahul_dahiya 0:fb8047b156bb 266 buf->p = *p;
rahul_dahiya 0:fb8047b156bb 267 *p += buf->len;
rahul_dahiya 0:fb8047b156bb 268
rahul_dahiya 0:fb8047b156bb 269 /* Allocate and assign next pointer */
rahul_dahiya 0:fb8047b156bb 270 if( *p < end )
rahul_dahiya 0:fb8047b156bb 271 {
rahul_dahiya 0:fb8047b156bb 272 cur->next = (mbedtls_asn1_sequence*)mbedtls_calloc( 1,
rahul_dahiya 0:fb8047b156bb 273 sizeof( mbedtls_asn1_sequence ) );
rahul_dahiya 0:fb8047b156bb 274
rahul_dahiya 0:fb8047b156bb 275 if( cur->next == NULL )
rahul_dahiya 0:fb8047b156bb 276 return( MBEDTLS_ERR_ASN1_ALLOC_FAILED );
rahul_dahiya 0:fb8047b156bb 277
rahul_dahiya 0:fb8047b156bb 278 cur = cur->next;
rahul_dahiya 0:fb8047b156bb 279 }
rahul_dahiya 0:fb8047b156bb 280 }
rahul_dahiya 0:fb8047b156bb 281
rahul_dahiya 0:fb8047b156bb 282 /* Set final sequence entry's next pointer to NULL */
rahul_dahiya 0:fb8047b156bb 283 cur->next = NULL;
rahul_dahiya 0:fb8047b156bb 284
rahul_dahiya 0:fb8047b156bb 285 if( *p != end )
rahul_dahiya 0:fb8047b156bb 286 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
rahul_dahiya 0:fb8047b156bb 287
rahul_dahiya 0:fb8047b156bb 288 return( 0 );
rahul_dahiya 0:fb8047b156bb 289 }
rahul_dahiya 0:fb8047b156bb 290
rahul_dahiya 0:fb8047b156bb 291 int mbedtls_asn1_get_alg( unsigned char **p,
rahul_dahiya 0:fb8047b156bb 292 const unsigned char *end,
rahul_dahiya 0:fb8047b156bb 293 mbedtls_asn1_buf *alg, mbedtls_asn1_buf *params )
rahul_dahiya 0:fb8047b156bb 294 {
rahul_dahiya 0:fb8047b156bb 295 int ret;
rahul_dahiya 0:fb8047b156bb 296 size_t len;
rahul_dahiya 0:fb8047b156bb 297
rahul_dahiya 0:fb8047b156bb 298 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
rahul_dahiya 0:fb8047b156bb 299 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 300 return( ret );
rahul_dahiya 0:fb8047b156bb 301
rahul_dahiya 0:fb8047b156bb 302 if( ( end - *p ) < 1 )
rahul_dahiya 0:fb8047b156bb 303 return( MBEDTLS_ERR_ASN1_OUT_OF_DATA );
rahul_dahiya 0:fb8047b156bb 304
rahul_dahiya 0:fb8047b156bb 305 alg->tag = **p;
rahul_dahiya 0:fb8047b156bb 306 end = *p + len;
rahul_dahiya 0:fb8047b156bb 307
rahul_dahiya 0:fb8047b156bb 308 if( ( ret = mbedtls_asn1_get_tag( p, end, &alg->len, MBEDTLS_ASN1_OID ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 309 return( ret );
rahul_dahiya 0:fb8047b156bb 310
rahul_dahiya 0:fb8047b156bb 311 alg->p = *p;
rahul_dahiya 0:fb8047b156bb 312 *p += alg->len;
rahul_dahiya 0:fb8047b156bb 313
rahul_dahiya 0:fb8047b156bb 314 if( *p == end )
rahul_dahiya 0:fb8047b156bb 315 {
rahul_dahiya 0:fb8047b156bb 316 mbedtls_zeroize( params, sizeof(mbedtls_asn1_buf) );
rahul_dahiya 0:fb8047b156bb 317 return( 0 );
rahul_dahiya 0:fb8047b156bb 318 }
rahul_dahiya 0:fb8047b156bb 319
rahul_dahiya 0:fb8047b156bb 320 params->tag = **p;
rahul_dahiya 0:fb8047b156bb 321 (*p)++;
rahul_dahiya 0:fb8047b156bb 322
rahul_dahiya 0:fb8047b156bb 323 if( ( ret = mbedtls_asn1_get_len( p, end, &params->len ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 324 return( ret );
rahul_dahiya 0:fb8047b156bb 325
rahul_dahiya 0:fb8047b156bb 326 params->p = *p;
rahul_dahiya 0:fb8047b156bb 327 *p += params->len;
rahul_dahiya 0:fb8047b156bb 328
rahul_dahiya 0:fb8047b156bb 329 if( *p != end )
rahul_dahiya 0:fb8047b156bb 330 return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
rahul_dahiya 0:fb8047b156bb 331
rahul_dahiya 0:fb8047b156bb 332 return( 0 );
rahul_dahiya 0:fb8047b156bb 333 }
rahul_dahiya 0:fb8047b156bb 334
rahul_dahiya 0:fb8047b156bb 335 int mbedtls_asn1_get_alg_null( unsigned char **p,
rahul_dahiya 0:fb8047b156bb 336 const unsigned char *end,
rahul_dahiya 0:fb8047b156bb 337 mbedtls_asn1_buf *alg )
rahul_dahiya 0:fb8047b156bb 338 {
rahul_dahiya 0:fb8047b156bb 339 int ret;
rahul_dahiya 0:fb8047b156bb 340 mbedtls_asn1_buf params;
rahul_dahiya 0:fb8047b156bb 341
rahul_dahiya 0:fb8047b156bb 342 memset( &params, 0, sizeof(mbedtls_asn1_buf) );
rahul_dahiya 0:fb8047b156bb 343
rahul_dahiya 0:fb8047b156bb 344 if( ( ret = mbedtls_asn1_get_alg( p, end, alg, &params ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 345 return( ret );
rahul_dahiya 0:fb8047b156bb 346
rahul_dahiya 0:fb8047b156bb 347 if( ( params.tag != MBEDTLS_ASN1_NULL && params.tag != 0 ) || params.len != 0 )
rahul_dahiya 0:fb8047b156bb 348 return( MBEDTLS_ERR_ASN1_INVALID_DATA );
rahul_dahiya 0:fb8047b156bb 349
rahul_dahiya 0:fb8047b156bb 350 return( 0 );
rahul_dahiya 0:fb8047b156bb 351 }
rahul_dahiya 0:fb8047b156bb 352
rahul_dahiya 0:fb8047b156bb 353 void mbedtls_asn1_free_named_data( mbedtls_asn1_named_data *cur )
rahul_dahiya 0:fb8047b156bb 354 {
rahul_dahiya 0:fb8047b156bb 355 if( cur == NULL )
rahul_dahiya 0:fb8047b156bb 356 return;
rahul_dahiya 0:fb8047b156bb 357
rahul_dahiya 0:fb8047b156bb 358 mbedtls_free( cur->oid.p );
rahul_dahiya 0:fb8047b156bb 359 mbedtls_free( cur->val.p );
rahul_dahiya 0:fb8047b156bb 360
rahul_dahiya 0:fb8047b156bb 361 mbedtls_zeroize( cur, sizeof( mbedtls_asn1_named_data ) );
rahul_dahiya 0:fb8047b156bb 362 }
rahul_dahiya 0:fb8047b156bb 363
rahul_dahiya 0:fb8047b156bb 364 void mbedtls_asn1_free_named_data_list( mbedtls_asn1_named_data **head )
rahul_dahiya 0:fb8047b156bb 365 {
rahul_dahiya 0:fb8047b156bb 366 mbedtls_asn1_named_data *cur;
rahul_dahiya 0:fb8047b156bb 367
rahul_dahiya 0:fb8047b156bb 368 while( ( cur = *head ) != NULL )
rahul_dahiya 0:fb8047b156bb 369 {
rahul_dahiya 0:fb8047b156bb 370 *head = cur->next;
rahul_dahiya 0:fb8047b156bb 371 mbedtls_asn1_free_named_data( cur );
rahul_dahiya 0:fb8047b156bb 372 mbedtls_free( cur );
rahul_dahiya 0:fb8047b156bb 373 }
rahul_dahiya 0:fb8047b156bb 374 }
rahul_dahiya 0:fb8047b156bb 375
rahul_dahiya 0:fb8047b156bb 376 mbedtls_asn1_named_data *mbedtls_asn1_find_named_data( mbedtls_asn1_named_data *list,
rahul_dahiya 0:fb8047b156bb 377 const char *oid, size_t len )
rahul_dahiya 0:fb8047b156bb 378 {
rahul_dahiya 0:fb8047b156bb 379 while( list != NULL )
rahul_dahiya 0:fb8047b156bb 380 {
rahul_dahiya 0:fb8047b156bb 381 if( list->oid.len == len &&
rahul_dahiya 0:fb8047b156bb 382 memcmp( list->oid.p, oid, len ) == 0 )
rahul_dahiya 0:fb8047b156bb 383 {
rahul_dahiya 0:fb8047b156bb 384 break;
rahul_dahiya 0:fb8047b156bb 385 }
rahul_dahiya 0:fb8047b156bb 386
rahul_dahiya 0:fb8047b156bb 387 list = list->next;
rahul_dahiya 0:fb8047b156bb 388 }
rahul_dahiya 0:fb8047b156bb 389
rahul_dahiya 0:fb8047b156bb 390 return( list );
rahul_dahiya 0:fb8047b156bb 391 }
rahul_dahiya 0:fb8047b156bb 392
rahul_dahiya 0:fb8047b156bb 393 #endif /* MBEDTLS_ASN1_PARSE_C */