Nitin Shukla / LED_Demo

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Dependencies:   MAX44000 nexpaq_mdk

Fork of LED_Demo by Maxim nexpaq

mbd_os/features/mbedtls/src/asn1write.c@7:3a65ef12ba31, 2016-11-04 (annotated)

Committer:
nitsshukla
Date:
Fri Nov 04 12:06:04 2016 +0000
Revision:
7:3a65ef12ba31
Parent:
1:55a6170b404f 
kghj;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
nexpaq 1:55a6170b404f 1 /*
nexpaq 1:55a6170b404f 2 * ASN.1 buffer writing functionality
nexpaq 1:55a6170b404f 3 *
nexpaq 1:55a6170b404f 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
nexpaq 1:55a6170b404f 5 * SPDX-License-Identifier: Apache-2.0
nexpaq 1:55a6170b404f 6 *
nexpaq 1:55a6170b404f 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
nexpaq 1:55a6170b404f 8 * not use this file except in compliance with the License.
nexpaq 1:55a6170b404f 9 * You may obtain a copy of the License at
nexpaq 1:55a6170b404f 10 *
nexpaq 1:55a6170b404f 11 * http://www.apache.org/licenses/LICENSE-2.0
nexpaq 1:55a6170b404f 12 *
nexpaq 1:55a6170b404f 13 * Unless required by applicable law or agreed to in writing, software
nexpaq 1:55a6170b404f 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
nexpaq 1:55a6170b404f 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
nexpaq 1:55a6170b404f 16 * See the License for the specific language governing permissions and
nexpaq 1:55a6170b404f 17 * limitations under the License.
nexpaq 1:55a6170b404f 18 *
nexpaq 1:55a6170b404f 19 * This file is part of mbed TLS (https://tls.mbed.org)
nexpaq 1:55a6170b404f 20 */
nexpaq 1:55a6170b404f 21
nexpaq 1:55a6170b404f 22 #if !defined(MBEDTLS_CONFIG_FILE)
nexpaq 1:55a6170b404f 23 #include "mbedtls/config.h"
nexpaq 1:55a6170b404f 24 #else
nexpaq 1:55a6170b404f 25 #include MBEDTLS_CONFIG_FILE
nexpaq 1:55a6170b404f 26 #endif
nexpaq 1:55a6170b404f 27
nexpaq 1:55a6170b404f 28 #if defined(MBEDTLS_ASN1_WRITE_C)
nexpaq 1:55a6170b404f 29
nexpaq 1:55a6170b404f 30 #include "mbedtls/asn1write.h"
nexpaq 1:55a6170b404f 31
nexpaq 1:55a6170b404f 32 #include <string.h>
nexpaq 1:55a6170b404f 33
nexpaq 1:55a6170b404f 34 #if defined(MBEDTLS_PLATFORM_C)
nexpaq 1:55a6170b404f 35 #include "mbedtls/platform.h"
nexpaq 1:55a6170b404f 36 #else
nexpaq 1:55a6170b404f 37 #include <stdlib.h>
nexpaq 1:55a6170b404f 38 #define mbedtls_calloc calloc
nexpaq 1:55a6170b404f 39 #define mbedtls_free free
nexpaq 1:55a6170b404f 40 #endif
nexpaq 1:55a6170b404f 41
nexpaq 1:55a6170b404f 42 int mbedtls_asn1_write_len( unsigned char **p, unsigned char *start, size_t len )
nexpaq 1:55a6170b404f 43 {
nexpaq 1:55a6170b404f 44 if( len < 0x80 )
nexpaq 1:55a6170b404f 45 {
nexpaq 1:55a6170b404f 46 if( *p - start < 1 )
nexpaq 1:55a6170b404f 47 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
nexpaq 1:55a6170b404f 48
nexpaq 1:55a6170b404f 49 *--(*p) = (unsigned char) len;
nexpaq 1:55a6170b404f 50 return( 1 );
nexpaq 1:55a6170b404f 51 }
nexpaq 1:55a6170b404f 52
nexpaq 1:55a6170b404f 53 if( len <= 0xFF )
nexpaq 1:55a6170b404f 54 {
nexpaq 1:55a6170b404f 55 if( *p - start < 2 )
nexpaq 1:55a6170b404f 56 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
nexpaq 1:55a6170b404f 57
nexpaq 1:55a6170b404f 58 *--(*p) = (unsigned char) len;
nexpaq 1:55a6170b404f 59 *--(*p) = 0x81;
nexpaq 1:55a6170b404f 60 return( 2 );
nexpaq 1:55a6170b404f 61 }
nexpaq 1:55a6170b404f 62
nexpaq 1:55a6170b404f 63 if( *p - start < 3 )
nexpaq 1:55a6170b404f 64 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
nexpaq 1:55a6170b404f 65
nexpaq 1:55a6170b404f 66 // We assume we never have lengths larger than 65535 bytes
nexpaq 1:55a6170b404f 67 //
nexpaq 1:55a6170b404f 68 *--(*p) = len % 256;
nexpaq 1:55a6170b404f 69 *--(*p) = ( len / 256 ) % 256;
nexpaq 1:55a6170b404f 70 *--(*p) = 0x82;
nexpaq 1:55a6170b404f 71
nexpaq 1:55a6170b404f 72 return( 3 );
nexpaq 1:55a6170b404f 73 }
nexpaq 1:55a6170b404f 74
nexpaq 1:55a6170b404f 75 int mbedtls_asn1_write_tag( unsigned char **p, unsigned char *start, unsigned char tag )
nexpaq 1:55a6170b404f 76 {
nexpaq 1:55a6170b404f 77 if( *p - start < 1 )
nexpaq 1:55a6170b404f 78 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
nexpaq 1:55a6170b404f 79
nexpaq 1:55a6170b404f 80 *--(*p) = tag;
nexpaq 1:55a6170b404f 81
nexpaq 1:55a6170b404f 82 return( 1 );
nexpaq 1:55a6170b404f 83 }
nexpaq 1:55a6170b404f 84
nexpaq 1:55a6170b404f 85 int mbedtls_asn1_write_raw_buffer( unsigned char **p, unsigned char *start,
nexpaq 1:55a6170b404f 86 const unsigned char *buf, size_t size )
nexpaq 1:55a6170b404f 87 {
nexpaq 1:55a6170b404f 88 size_t len = 0;
nexpaq 1:55a6170b404f 89
nexpaq 1:55a6170b404f 90 if( *p < start || (size_t)( *p - start ) < size )
nexpaq 1:55a6170b404f 91 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
nexpaq 1:55a6170b404f 92
nexpaq 1:55a6170b404f 93 len = size;
nexpaq 1:55a6170b404f 94 (*p) -= len;
nexpaq 1:55a6170b404f 95 memcpy( *p, buf, len );
nexpaq 1:55a6170b404f 96
nexpaq 1:55a6170b404f 97 return( (int) len );
nexpaq 1:55a6170b404f 98 }
nexpaq 1:55a6170b404f 99
nexpaq 1:55a6170b404f 100 #if defined(MBEDTLS_BIGNUM_C)
nexpaq 1:55a6170b404f 101 int mbedtls_asn1_write_mpi( unsigned char **p, unsigned char *start, const mbedtls_mpi *X )
nexpaq 1:55a6170b404f 102 {
nexpaq 1:55a6170b404f 103 int ret;
nexpaq 1:55a6170b404f 104 size_t len = 0;
nexpaq 1:55a6170b404f 105
nexpaq 1:55a6170b404f 106 // Write the MPI
nexpaq 1:55a6170b404f 107 //
nexpaq 1:55a6170b404f 108 len = mbedtls_mpi_size( X );
nexpaq 1:55a6170b404f 109
nexpaq 1:55a6170b404f 110 if( *p < start || (size_t)( *p - start ) < len )
nexpaq 1:55a6170b404f 111 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
nexpaq 1:55a6170b404f 112
nexpaq 1:55a6170b404f 113 (*p) -= len;
nexpaq 1:55a6170b404f 114 MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( X, *p, len ) );
nexpaq 1:55a6170b404f 115
nexpaq 1:55a6170b404f 116 // DER format assumes 2s complement for numbers, so the leftmost bit
nexpaq 1:55a6170b404f 117 // should be 0 for positive numbers and 1 for negative numbers.
nexpaq 1:55a6170b404f 118 //
nexpaq 1:55a6170b404f 119 if( X->s ==1 && **p & 0x80 )
nexpaq 1:55a6170b404f 120 {
nexpaq 1:55a6170b404f 121 if( *p - start < 1 )
nexpaq 1:55a6170b404f 122 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
nexpaq 1:55a6170b404f 123
nexpaq 1:55a6170b404f 124 *--(*p) = 0x00;
nexpaq 1:55a6170b404f 125 len += 1;
nexpaq 1:55a6170b404f 126 }
nexpaq 1:55a6170b404f 127
nexpaq 1:55a6170b404f 128 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
nexpaq 1:55a6170b404f 129 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_INTEGER ) );
nexpaq 1:55a6170b404f 130
nexpaq 1:55a6170b404f 131 ret = (int) len;
nexpaq 1:55a6170b404f 132
nexpaq 1:55a6170b404f 133 cleanup:
nexpaq 1:55a6170b404f 134 return( ret );
nexpaq 1:55a6170b404f 135 }
nexpaq 1:55a6170b404f 136 #endif /* MBEDTLS_BIGNUM_C */
nexpaq 1:55a6170b404f 137
nexpaq 1:55a6170b404f 138 int mbedtls_asn1_write_null( unsigned char **p, unsigned char *start )
nexpaq 1:55a6170b404f 139 {
nexpaq 1:55a6170b404f 140 int ret;
nexpaq 1:55a6170b404f 141 size_t len = 0;
nexpaq 1:55a6170b404f 142
nexpaq 1:55a6170b404f 143 // Write NULL
nexpaq 1:55a6170b404f 144 //
nexpaq 1:55a6170b404f 145 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, 0) );
nexpaq 1:55a6170b404f 146 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_NULL ) );
nexpaq 1:55a6170b404f 147
nexpaq 1:55a6170b404f 148 return( (int) len );
nexpaq 1:55a6170b404f 149 }
nexpaq 1:55a6170b404f 150
nexpaq 1:55a6170b404f 151 int mbedtls_asn1_write_oid( unsigned char **p, unsigned char *start,
nexpaq 1:55a6170b404f 152 const char *oid, size_t oid_len )
nexpaq 1:55a6170b404f 153 {
nexpaq 1:55a6170b404f 154 int ret;
nexpaq 1:55a6170b404f 155 size_t len = 0;
nexpaq 1:55a6170b404f 156
nexpaq 1:55a6170b404f 157 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start,
nexpaq 1:55a6170b404f 158 (const unsigned char *) oid, oid_len ) );
nexpaq 1:55a6170b404f 159 MBEDTLS_ASN1_CHK_ADD( len , mbedtls_asn1_write_len( p, start, len ) );
nexpaq 1:55a6170b404f 160 MBEDTLS_ASN1_CHK_ADD( len , mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_OID ) );
nexpaq 1:55a6170b404f 161
nexpaq 1:55a6170b404f 162 return( (int) len );
nexpaq 1:55a6170b404f 163 }
nexpaq 1:55a6170b404f 164
nexpaq 1:55a6170b404f 165 int mbedtls_asn1_write_algorithm_identifier( unsigned char **p, unsigned char *start,
nexpaq 1:55a6170b404f 166 const char *oid, size_t oid_len,
nexpaq 1:55a6170b404f 167 size_t par_len )
nexpaq 1:55a6170b404f 168 {
nexpaq 1:55a6170b404f 169 int ret;
nexpaq 1:55a6170b404f 170 size_t len = 0;
nexpaq 1:55a6170b404f 171
nexpaq 1:55a6170b404f 172 if( par_len == 0 )
nexpaq 1:55a6170b404f 173 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_null( p, start ) );
nexpaq 1:55a6170b404f 174 else
nexpaq 1:55a6170b404f 175 len += par_len;
nexpaq 1:55a6170b404f 176
nexpaq 1:55a6170b404f 177 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( p, start, oid, oid_len ) );
nexpaq 1:55a6170b404f 178
nexpaq 1:55a6170b404f 179 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
nexpaq 1:55a6170b404f 180 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start,
nexpaq 1:55a6170b404f 181 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) );
nexpaq 1:55a6170b404f 182
nexpaq 1:55a6170b404f 183 return( (int) len );
nexpaq 1:55a6170b404f 184 }
nexpaq 1:55a6170b404f 185
nexpaq 1:55a6170b404f 186 int mbedtls_asn1_write_bool( unsigned char **p, unsigned char *start, int boolean )
nexpaq 1:55a6170b404f 187 {
nexpaq 1:55a6170b404f 188 int ret;
nexpaq 1:55a6170b404f 189 size_t len = 0;
nexpaq 1:55a6170b404f 190
nexpaq 1:55a6170b404f 191 if( *p - start < 1 )
nexpaq 1:55a6170b404f 192 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
nexpaq 1:55a6170b404f 193
nexpaq 1:55a6170b404f 194 *--(*p) = (boolean) ? 255 : 0;
nexpaq 1:55a6170b404f 195 len++;
nexpaq 1:55a6170b404f 196
nexpaq 1:55a6170b404f 197 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
nexpaq 1:55a6170b404f 198 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_BOOLEAN ) );
nexpaq 1:55a6170b404f 199
nexpaq 1:55a6170b404f 200 return( (int) len );
nexpaq 1:55a6170b404f 201 }
nexpaq 1:55a6170b404f 202
nexpaq 1:55a6170b404f 203 int mbedtls_asn1_write_int( unsigned char **p, unsigned char *start, int val )
nexpaq 1:55a6170b404f 204 {
nexpaq 1:55a6170b404f 205 int ret;
nexpaq 1:55a6170b404f 206 size_t len = 0;
nexpaq 1:55a6170b404f 207
nexpaq 1:55a6170b404f 208 // TODO negative values and values larger than 128
nexpaq 1:55a6170b404f 209 // DER format assumes 2s complement for numbers, so the leftmost bit
nexpaq 1:55a6170b404f 210 // should be 0 for positive numbers and 1 for negative numbers.
nexpaq 1:55a6170b404f 211 //
nexpaq 1:55a6170b404f 212 if( *p - start < 1 )
nexpaq 1:55a6170b404f 213 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
nexpaq 1:55a6170b404f 214
nexpaq 1:55a6170b404f 215 len += 1;
nexpaq 1:55a6170b404f 216 *--(*p) = val;
nexpaq 1:55a6170b404f 217
nexpaq 1:55a6170b404f 218 if( val > 0 && **p & 0x80 )
nexpaq 1:55a6170b404f 219 {
nexpaq 1:55a6170b404f 220 if( *p - start < 1 )
nexpaq 1:55a6170b404f 221 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
nexpaq 1:55a6170b404f 222
nexpaq 1:55a6170b404f 223 *--(*p) = 0x00;
nexpaq 1:55a6170b404f 224 len += 1;
nexpaq 1:55a6170b404f 225 }
nexpaq 1:55a6170b404f 226
nexpaq 1:55a6170b404f 227 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
nexpaq 1:55a6170b404f 228 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_INTEGER ) );
nexpaq 1:55a6170b404f 229
nexpaq 1:55a6170b404f 230 return( (int) len );
nexpaq 1:55a6170b404f 231 }
nexpaq 1:55a6170b404f 232
nexpaq 1:55a6170b404f 233 int mbedtls_asn1_write_printable_string( unsigned char **p, unsigned char *start,
nexpaq 1:55a6170b404f 234 const char *text, size_t text_len )
nexpaq 1:55a6170b404f 235 {
nexpaq 1:55a6170b404f 236 int ret;
nexpaq 1:55a6170b404f 237 size_t len = 0;
nexpaq 1:55a6170b404f 238
nexpaq 1:55a6170b404f 239 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start,
nexpaq 1:55a6170b404f 240 (const unsigned char *) text, text_len ) );
nexpaq 1:55a6170b404f 241
nexpaq 1:55a6170b404f 242 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
nexpaq 1:55a6170b404f 243 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_PRINTABLE_STRING ) );
nexpaq 1:55a6170b404f 244
nexpaq 1:55a6170b404f 245 return( (int) len );
nexpaq 1:55a6170b404f 246 }
nexpaq 1:55a6170b404f 247
nexpaq 1:55a6170b404f 248 int mbedtls_asn1_write_ia5_string( unsigned char **p, unsigned char *start,
nexpaq 1:55a6170b404f 249 const char *text, size_t text_len )
nexpaq 1:55a6170b404f 250 {
nexpaq 1:55a6170b404f 251 int ret;
nexpaq 1:55a6170b404f 252 size_t len = 0;
nexpaq 1:55a6170b404f 253
nexpaq 1:55a6170b404f 254 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start,
nexpaq 1:55a6170b404f 255 (const unsigned char *) text, text_len ) );
nexpaq 1:55a6170b404f 256
nexpaq 1:55a6170b404f 257 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
nexpaq 1:55a6170b404f 258 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_IA5_STRING ) );
nexpaq 1:55a6170b404f 259
nexpaq 1:55a6170b404f 260 return( (int) len );
nexpaq 1:55a6170b404f 261 }
nexpaq 1:55a6170b404f 262
nexpaq 1:55a6170b404f 263 int mbedtls_asn1_write_bitstring( unsigned char **p, unsigned char *start,
nexpaq 1:55a6170b404f 264 const unsigned char *buf, size_t bits )
nexpaq 1:55a6170b404f 265 {
nexpaq 1:55a6170b404f 266 int ret;
nexpaq 1:55a6170b404f 267 size_t len = 0, size;
nexpaq 1:55a6170b404f 268
nexpaq 1:55a6170b404f 269 size = ( bits / 8 ) + ( ( bits % 8 ) ? 1 : 0 );
nexpaq 1:55a6170b404f 270
nexpaq 1:55a6170b404f 271 // Calculate byte length
nexpaq 1:55a6170b404f 272 //
nexpaq 1:55a6170b404f 273 if( *p < start || (size_t)( *p - start ) < size + 1 )
nexpaq 1:55a6170b404f 274 return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
nexpaq 1:55a6170b404f 275
nexpaq 1:55a6170b404f 276 len = size + 1;
nexpaq 1:55a6170b404f 277 (*p) -= size;
nexpaq 1:55a6170b404f 278 memcpy( *p, buf, size );
nexpaq 1:55a6170b404f 279
nexpaq 1:55a6170b404f 280 // Write unused bits
nexpaq 1:55a6170b404f 281 //
nexpaq 1:55a6170b404f 282 *--(*p) = (unsigned char) (size * 8 - bits);
nexpaq 1:55a6170b404f 283
nexpaq 1:55a6170b404f 284 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
nexpaq 1:55a6170b404f 285 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_BIT_STRING ) );
nexpaq 1:55a6170b404f 286
nexpaq 1:55a6170b404f 287 return( (int) len );
nexpaq 1:55a6170b404f 288 }
nexpaq 1:55a6170b404f 289
nexpaq 1:55a6170b404f 290 int mbedtls_asn1_write_octet_string( unsigned char **p, unsigned char *start,
nexpaq 1:55a6170b404f 291 const unsigned char *buf, size_t size )
nexpaq 1:55a6170b404f 292 {
nexpaq 1:55a6170b404f 293 int ret;
nexpaq 1:55a6170b404f 294 size_t len = 0;
nexpaq 1:55a6170b404f 295
nexpaq 1:55a6170b404f 296 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start, buf, size ) );
nexpaq 1:55a6170b404f 297
nexpaq 1:55a6170b404f 298 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
nexpaq 1:55a6170b404f 299 MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_OCTET_STRING ) );
nexpaq 1:55a6170b404f 300
nexpaq 1:55a6170b404f 301 return( (int) len );
nexpaq 1:55a6170b404f 302 }
nexpaq 1:55a6170b404f 303
nexpaq 1:55a6170b404f 304 mbedtls_asn1_named_data *mbedtls_asn1_store_named_data( mbedtls_asn1_named_data **head,
nexpaq 1:55a6170b404f 305 const char *oid, size_t oid_len,
nexpaq 1:55a6170b404f 306 const unsigned char *val,
nexpaq 1:55a6170b404f 307 size_t val_len )
nexpaq 1:55a6170b404f 308 {
nexpaq 1:55a6170b404f 309 mbedtls_asn1_named_data *cur;
nexpaq 1:55a6170b404f 310
nexpaq 1:55a6170b404f 311 if( ( cur = mbedtls_asn1_find_named_data( *head, oid, oid_len ) ) == NULL )
nexpaq 1:55a6170b404f 312 {
nexpaq 1:55a6170b404f 313 // Add new entry if not present yet based on OID
nexpaq 1:55a6170b404f 314 //
nexpaq 1:55a6170b404f 315 cur = (mbedtls_asn1_named_data*)mbedtls_calloc( 1,
nexpaq 1:55a6170b404f 316 sizeof(mbedtls_asn1_named_data) );
nexpaq 1:55a6170b404f 317 if( cur == NULL )
nexpaq 1:55a6170b404f 318 return( NULL );
nexpaq 1:55a6170b404f 319
nexpaq 1:55a6170b404f 320 cur->oid.len = oid_len;
nexpaq 1:55a6170b404f 321 cur->oid.p = mbedtls_calloc( 1, oid_len );
nexpaq 1:55a6170b404f 322 if( cur->oid.p == NULL )
nexpaq 1:55a6170b404f 323 {
nexpaq 1:55a6170b404f 324 mbedtls_free( cur );
nexpaq 1:55a6170b404f 325 return( NULL );
nexpaq 1:55a6170b404f 326 }
nexpaq 1:55a6170b404f 327
nexpaq 1:55a6170b404f 328 memcpy( cur->oid.p, oid, oid_len );
nexpaq 1:55a6170b404f 329
nexpaq 1:55a6170b404f 330 cur->val.len = val_len;
nexpaq 1:55a6170b404f 331 cur->val.p = mbedtls_calloc( 1, val_len );
nexpaq 1:55a6170b404f 332 if( cur->val.p == NULL )
nexpaq 1:55a6170b404f 333 {
nexpaq 1:55a6170b404f 334 mbedtls_free( cur->oid.p );
nexpaq 1:55a6170b404f 335 mbedtls_free( cur );
nexpaq 1:55a6170b404f 336 return( NULL );
nexpaq 1:55a6170b404f 337 }
nexpaq 1:55a6170b404f 338
nexpaq 1:55a6170b404f 339 cur->next = *head;
nexpaq 1:55a6170b404f 340 *head = cur;
nexpaq 1:55a6170b404f 341 }
nexpaq 1:55a6170b404f 342 else if( cur->val.len < val_len )
nexpaq 1:55a6170b404f 343 {
nexpaq 1:55a6170b404f 344 /*
nexpaq 1:55a6170b404f 345 * Enlarge existing value buffer if needed
nexpaq 1:55a6170b404f 346 * Preserve old data until the allocation succeeded, to leave list in
nexpaq 1:55a6170b404f 347 * a consistent state in case allocation fails.
nexpaq 1:55a6170b404f 348 */
nexpaq 1:55a6170b404f 349 void *p = mbedtls_calloc( 1, val_len );
nexpaq 1:55a6170b404f 350 if( p == NULL )
nexpaq 1:55a6170b404f 351 return( NULL );
nexpaq 1:55a6170b404f 352
nexpaq 1:55a6170b404f 353 mbedtls_free( cur->val.p );
nexpaq 1:55a6170b404f 354 cur->val.p = p;
nexpaq 1:55a6170b404f 355 cur->val.len = val_len;
nexpaq 1:55a6170b404f 356 }
nexpaq 1:55a6170b404f 357
nexpaq 1:55a6170b404f 358 if( val != NULL )
nexpaq 1:55a6170b404f 359 memcpy( cur->val.p, val, val_len );
nexpaq 1:55a6170b404f 360
nexpaq 1:55a6170b404f 361 return( cur );
nexpaq 1:55a6170b404f 362 }
nexpaq 1:55a6170b404f 363 #endif /* MBEDTLS_ASN1_WRITE_C */