Nitin Shukla / LED_Demo

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Dependencies:   MAX44000 nexpaq_mdk

Fork of LED_Demo by Maxim nexpaq

mbd_os/features/mbedtls/src/cipher.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 * \file cipher.c
nexpaq 1:55a6170b404f 3 *
nexpaq 1:55a6170b404f 4 * \brief Generic cipher wrapper for mbed TLS
nexpaq 1:55a6170b404f 5 *
nexpaq 1:55a6170b404f 6 * \author Adriaan de Jong <dejong@fox-it.com>
nexpaq 1:55a6170b404f 7 *
nexpaq 1:55a6170b404f 8 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
nexpaq 1:55a6170b404f 9 * SPDX-License-Identifier: Apache-2.0
nexpaq 1:55a6170b404f 10 *
nexpaq 1:55a6170b404f 11 * Licensed under the Apache License, Version 2.0 (the "License"); you may
nexpaq 1:55a6170b404f 12 * not use this file except in compliance with the License.
nexpaq 1:55a6170b404f 13 * You may obtain a copy of the License at
nexpaq 1:55a6170b404f 14 *
nexpaq 1:55a6170b404f 15 * http://www.apache.org/licenses/LICENSE-2.0
nexpaq 1:55a6170b404f 16 *
nexpaq 1:55a6170b404f 17 * Unless required by applicable law or agreed to in writing, software
nexpaq 1:55a6170b404f 18 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
nexpaq 1:55a6170b404f 19 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
nexpaq 1:55a6170b404f 20 * See the License for the specific language governing permissions and
nexpaq 1:55a6170b404f 21 * limitations under the License.
nexpaq 1:55a6170b404f 22 *
nexpaq 1:55a6170b404f 23 * This file is part of mbed TLS (https://tls.mbed.org)
nexpaq 1:55a6170b404f 24 */
nexpaq 1:55a6170b404f 25
nexpaq 1:55a6170b404f 26 #if !defined(MBEDTLS_CONFIG_FILE)
nexpaq 1:55a6170b404f 27 #include "mbedtls/config.h"
nexpaq 1:55a6170b404f 28 #else
nexpaq 1:55a6170b404f 29 #include MBEDTLS_CONFIG_FILE
nexpaq 1:55a6170b404f 30 #endif
nexpaq 1:55a6170b404f 31
nexpaq 1:55a6170b404f 32 #if defined(MBEDTLS_CIPHER_C)
nexpaq 1:55a6170b404f 33
nexpaq 1:55a6170b404f 34 #include "mbedtls/cipher.h"
nexpaq 1:55a6170b404f 35 #include "mbedtls/cipher_internal.h"
nexpaq 1:55a6170b404f 36
nexpaq 1:55a6170b404f 37 #include <stdlib.h>
nexpaq 1:55a6170b404f 38 #include <string.h>
nexpaq 1:55a6170b404f 39
nexpaq 1:55a6170b404f 40 #if defined(MBEDTLS_GCM_C)
nexpaq 1:55a6170b404f 41 #include "mbedtls/gcm.h"
nexpaq 1:55a6170b404f 42 #endif
nexpaq 1:55a6170b404f 43
nexpaq 1:55a6170b404f 44 #if defined(MBEDTLS_CCM_C)
nexpaq 1:55a6170b404f 45 #include "mbedtls/ccm.h"
nexpaq 1:55a6170b404f 46 #endif
nexpaq 1:55a6170b404f 47
nexpaq 1:55a6170b404f 48 #if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER)
nexpaq 1:55a6170b404f 49 #define MBEDTLS_CIPHER_MODE_STREAM
nexpaq 1:55a6170b404f 50 #endif
nexpaq 1:55a6170b404f 51
nexpaq 1:55a6170b404f 52 /* Implementation that should never be optimized out by the compiler */
nexpaq 1:55a6170b404f 53 static void mbedtls_zeroize( void *v, size_t n ) {
nexpaq 1:55a6170b404f 54 volatile unsigned char *p = (unsigned char*)v; while( n-- ) *p++ = 0;
nexpaq 1:55a6170b404f 55 }
nexpaq 1:55a6170b404f 56
nexpaq 1:55a6170b404f 57 static int supported_init = 0;
nexpaq 1:55a6170b404f 58
nexpaq 1:55a6170b404f 59 const int *mbedtls_cipher_list( void )
nexpaq 1:55a6170b404f 60 {
nexpaq 1:55a6170b404f 61 const mbedtls_cipher_definition_t *def;
nexpaq 1:55a6170b404f 62 int *type;
nexpaq 1:55a6170b404f 63
nexpaq 1:55a6170b404f 64 if( ! supported_init )
nexpaq 1:55a6170b404f 65 {
nexpaq 1:55a6170b404f 66 def = mbedtls_cipher_definitions;
nexpaq 1:55a6170b404f 67 type = mbedtls_cipher_supported;
nexpaq 1:55a6170b404f 68
nexpaq 1:55a6170b404f 69 while( def->type != 0 )
nexpaq 1:55a6170b404f 70 *type++ = (*def++).type;
nexpaq 1:55a6170b404f 71
nexpaq 1:55a6170b404f 72 *type = 0;
nexpaq 1:55a6170b404f 73
nexpaq 1:55a6170b404f 74 supported_init = 1;
nexpaq 1:55a6170b404f 75 }
nexpaq 1:55a6170b404f 76
nexpaq 1:55a6170b404f 77 return( mbedtls_cipher_supported );
nexpaq 1:55a6170b404f 78 }
nexpaq 1:55a6170b404f 79
nexpaq 1:55a6170b404f 80 const mbedtls_cipher_info_t *mbedtls_cipher_info_from_type( const mbedtls_cipher_type_t cipher_type )
nexpaq 1:55a6170b404f 81 {
nexpaq 1:55a6170b404f 82 const mbedtls_cipher_definition_t *def;
nexpaq 1:55a6170b404f 83
nexpaq 1:55a6170b404f 84 for( def = mbedtls_cipher_definitions; def->info != NULL; def++ )
nexpaq 1:55a6170b404f 85 if( def->type == cipher_type )
nexpaq 1:55a6170b404f 86 return( def->info );
nexpaq 1:55a6170b404f 87
nexpaq 1:55a6170b404f 88 return( NULL );
nexpaq 1:55a6170b404f 89 }
nexpaq 1:55a6170b404f 90
nexpaq 1:55a6170b404f 91 const mbedtls_cipher_info_t *mbedtls_cipher_info_from_string( const char *cipher_name )
nexpaq 1:55a6170b404f 92 {
nexpaq 1:55a6170b404f 93 const mbedtls_cipher_definition_t *def;
nexpaq 1:55a6170b404f 94
nexpaq 1:55a6170b404f 95 if( NULL == cipher_name )
nexpaq 1:55a6170b404f 96 return( NULL );
nexpaq 1:55a6170b404f 97
nexpaq 1:55a6170b404f 98 for( def = mbedtls_cipher_definitions; def->info != NULL; def++ )
nexpaq 1:55a6170b404f 99 if( ! strcmp( def->info->name, cipher_name ) )
nexpaq 1:55a6170b404f 100 return( def->info );
nexpaq 1:55a6170b404f 101
nexpaq 1:55a6170b404f 102 return( NULL );
nexpaq 1:55a6170b404f 103 }
nexpaq 1:55a6170b404f 104
nexpaq 1:55a6170b404f 105 const mbedtls_cipher_info_t *mbedtls_cipher_info_from_values( const mbedtls_cipher_id_t cipher_id,
nexpaq 1:55a6170b404f 106 int key_bitlen,
nexpaq 1:55a6170b404f 107 const mbedtls_cipher_mode_t mode )
nexpaq 1:55a6170b404f 108 {
nexpaq 1:55a6170b404f 109 const mbedtls_cipher_definition_t *def;
nexpaq 1:55a6170b404f 110
nexpaq 1:55a6170b404f 111 for( def = mbedtls_cipher_definitions; def->info != NULL; def++ )
nexpaq 1:55a6170b404f 112 if( def->info->base->cipher == cipher_id &&
nexpaq 1:55a6170b404f 113 def->info->key_bitlen == (unsigned) key_bitlen &&
nexpaq 1:55a6170b404f 114 def->info->mode == mode )
nexpaq 1:55a6170b404f 115 return( def->info );
nexpaq 1:55a6170b404f 116
nexpaq 1:55a6170b404f 117 return( NULL );
nexpaq 1:55a6170b404f 118 }
nexpaq 1:55a6170b404f 119
nexpaq 1:55a6170b404f 120 void mbedtls_cipher_init( mbedtls_cipher_context_t *ctx )
nexpaq 1:55a6170b404f 121 {
nexpaq 1:55a6170b404f 122 memset( ctx, 0, sizeof( mbedtls_cipher_context_t ) );
nexpaq 1:55a6170b404f 123 }
nexpaq 1:55a6170b404f 124
nexpaq 1:55a6170b404f 125 void mbedtls_cipher_free( mbedtls_cipher_context_t *ctx )
nexpaq 1:55a6170b404f 126 {
nexpaq 1:55a6170b404f 127 if( ctx == NULL )
nexpaq 1:55a6170b404f 128 return;
nexpaq 1:55a6170b404f 129
nexpaq 1:55a6170b404f 130 if( ctx->cipher_ctx )
nexpaq 1:55a6170b404f 131 ctx->cipher_info->base->ctx_free_func( ctx->cipher_ctx );
nexpaq 1:55a6170b404f 132
nexpaq 1:55a6170b404f 133 mbedtls_zeroize( ctx, sizeof(mbedtls_cipher_context_t) );
nexpaq 1:55a6170b404f 134 }
nexpaq 1:55a6170b404f 135
nexpaq 1:55a6170b404f 136 int mbedtls_cipher_setup( mbedtls_cipher_context_t *ctx, const mbedtls_cipher_info_t *cipher_info )
nexpaq 1:55a6170b404f 137 {
nexpaq 1:55a6170b404f 138 if( NULL == cipher_info || NULL == ctx )
nexpaq 1:55a6170b404f 139 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 140
nexpaq 1:55a6170b404f 141 memset( ctx, 0, sizeof( mbedtls_cipher_context_t ) );
nexpaq 1:55a6170b404f 142
nexpaq 1:55a6170b404f 143 if( NULL == ( ctx->cipher_ctx = cipher_info->base->ctx_alloc_func() ) )
nexpaq 1:55a6170b404f 144 return( MBEDTLS_ERR_CIPHER_ALLOC_FAILED );
nexpaq 1:55a6170b404f 145
nexpaq 1:55a6170b404f 146 ctx->cipher_info = cipher_info;
nexpaq 1:55a6170b404f 147
nexpaq 1:55a6170b404f 148 #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
nexpaq 1:55a6170b404f 149 /*
nexpaq 1:55a6170b404f 150 * Ignore possible errors caused by a cipher mode that doesn't use padding
nexpaq 1:55a6170b404f 151 */
nexpaq 1:55a6170b404f 152 #if defined(MBEDTLS_CIPHER_PADDING_PKCS7)
nexpaq 1:55a6170b404f 153 (void) mbedtls_cipher_set_padding_mode( ctx, MBEDTLS_PADDING_PKCS7 );
nexpaq 1:55a6170b404f 154 #else
nexpaq 1:55a6170b404f 155 (void) mbedtls_cipher_set_padding_mode( ctx, MBEDTLS_PADDING_NONE );
nexpaq 1:55a6170b404f 156 #endif
nexpaq 1:55a6170b404f 157 #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
nexpaq 1:55a6170b404f 158
nexpaq 1:55a6170b404f 159 return( 0 );
nexpaq 1:55a6170b404f 160 }
nexpaq 1:55a6170b404f 161
nexpaq 1:55a6170b404f 162 int mbedtls_cipher_setkey( mbedtls_cipher_context_t *ctx, const unsigned char *key,
nexpaq 1:55a6170b404f 163 int key_bitlen, const mbedtls_operation_t operation )
nexpaq 1:55a6170b404f 164 {
nexpaq 1:55a6170b404f 165 if( NULL == ctx || NULL == ctx->cipher_info )
nexpaq 1:55a6170b404f 166 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 167
nexpaq 1:55a6170b404f 168 if( ( ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_KEY_LEN ) == 0 &&
nexpaq 1:55a6170b404f 169 (int) ctx->cipher_info->key_bitlen != key_bitlen )
nexpaq 1:55a6170b404f 170 {
nexpaq 1:55a6170b404f 171 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 172 }
nexpaq 1:55a6170b404f 173
nexpaq 1:55a6170b404f 174 ctx->key_bitlen = key_bitlen;
nexpaq 1:55a6170b404f 175 ctx->operation = operation;
nexpaq 1:55a6170b404f 176
nexpaq 1:55a6170b404f 177 /*
nexpaq 1:55a6170b404f 178 * For CFB and CTR mode always use the encryption key schedule
nexpaq 1:55a6170b404f 179 */
nexpaq 1:55a6170b404f 180 if( MBEDTLS_ENCRYPT == operation ||
nexpaq 1:55a6170b404f 181 MBEDTLS_MODE_CFB == ctx->cipher_info->mode ||
nexpaq 1:55a6170b404f 182 MBEDTLS_MODE_CTR == ctx->cipher_info->mode )
nexpaq 1:55a6170b404f 183 {
nexpaq 1:55a6170b404f 184 return ctx->cipher_info->base->setkey_enc_func( ctx->cipher_ctx, key,
nexpaq 1:55a6170b404f 185 ctx->key_bitlen );
nexpaq 1:55a6170b404f 186 }
nexpaq 1:55a6170b404f 187
nexpaq 1:55a6170b404f 188 if( MBEDTLS_DECRYPT == operation )
nexpaq 1:55a6170b404f 189 return ctx->cipher_info->base->setkey_dec_func( ctx->cipher_ctx, key,
nexpaq 1:55a6170b404f 190 ctx->key_bitlen );
nexpaq 1:55a6170b404f 191
nexpaq 1:55a6170b404f 192 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 193 }
nexpaq 1:55a6170b404f 194
nexpaq 1:55a6170b404f 195 int mbedtls_cipher_set_iv( mbedtls_cipher_context_t *ctx,
nexpaq 1:55a6170b404f 196 const unsigned char *iv, size_t iv_len )
nexpaq 1:55a6170b404f 197 {
nexpaq 1:55a6170b404f 198 size_t actual_iv_size;
nexpaq 1:55a6170b404f 199
nexpaq 1:55a6170b404f 200 if( NULL == ctx || NULL == ctx->cipher_info || NULL == iv )
nexpaq 1:55a6170b404f 201 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 202
nexpaq 1:55a6170b404f 203 /* avoid buffer overflow in ctx->iv */
nexpaq 1:55a6170b404f 204 if( iv_len > MBEDTLS_MAX_IV_LENGTH )
nexpaq 1:55a6170b404f 205 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
nexpaq 1:55a6170b404f 206
nexpaq 1:55a6170b404f 207 if( ( ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_IV_LEN ) != 0 )
nexpaq 1:55a6170b404f 208 actual_iv_size = iv_len;
nexpaq 1:55a6170b404f 209 else
nexpaq 1:55a6170b404f 210 {
nexpaq 1:55a6170b404f 211 actual_iv_size = ctx->cipher_info->iv_size;
nexpaq 1:55a6170b404f 212
nexpaq 1:55a6170b404f 213 /* avoid reading past the end of input buffer */
nexpaq 1:55a6170b404f 214 if( actual_iv_size > iv_len )
nexpaq 1:55a6170b404f 215 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 216 }
nexpaq 1:55a6170b404f 217
nexpaq 1:55a6170b404f 218 memcpy( ctx->iv, iv, actual_iv_size );
nexpaq 1:55a6170b404f 219 ctx->iv_size = actual_iv_size;
nexpaq 1:55a6170b404f 220
nexpaq 1:55a6170b404f 221 return( 0 );
nexpaq 1:55a6170b404f 222 }
nexpaq 1:55a6170b404f 223
nexpaq 1:55a6170b404f 224 int mbedtls_cipher_reset( mbedtls_cipher_context_t *ctx )
nexpaq 1:55a6170b404f 225 {
nexpaq 1:55a6170b404f 226 if( NULL == ctx || NULL == ctx->cipher_info )
nexpaq 1:55a6170b404f 227 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 228
nexpaq 1:55a6170b404f 229 ctx->unprocessed_len = 0;
nexpaq 1:55a6170b404f 230
nexpaq 1:55a6170b404f 231 return( 0 );
nexpaq 1:55a6170b404f 232 }
nexpaq 1:55a6170b404f 233
nexpaq 1:55a6170b404f 234 #if defined(MBEDTLS_GCM_C)
nexpaq 1:55a6170b404f 235 int mbedtls_cipher_update_ad( mbedtls_cipher_context_t *ctx,
nexpaq 1:55a6170b404f 236 const unsigned char *ad, size_t ad_len )
nexpaq 1:55a6170b404f 237 {
nexpaq 1:55a6170b404f 238 if( NULL == ctx || NULL == ctx->cipher_info )
nexpaq 1:55a6170b404f 239 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 240
nexpaq 1:55a6170b404f 241 if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
nexpaq 1:55a6170b404f 242 {
nexpaq 1:55a6170b404f 243 return mbedtls_gcm_starts( (mbedtls_gcm_context *) ctx->cipher_ctx, ctx->operation,
nexpaq 1:55a6170b404f 244 ctx->iv, ctx->iv_size, ad, ad_len );
nexpaq 1:55a6170b404f 245 }
nexpaq 1:55a6170b404f 246
nexpaq 1:55a6170b404f 247 return( 0 );
nexpaq 1:55a6170b404f 248 }
nexpaq 1:55a6170b404f 249 #endif /* MBEDTLS_GCM_C */
nexpaq 1:55a6170b404f 250
nexpaq 1:55a6170b404f 251 int mbedtls_cipher_update( mbedtls_cipher_context_t *ctx, const unsigned char *input,
nexpaq 1:55a6170b404f 252 size_t ilen, unsigned char *output, size_t *olen )
nexpaq 1:55a6170b404f 253 {
nexpaq 1:55a6170b404f 254 int ret;
nexpaq 1:55a6170b404f 255 size_t block_size = 0;
nexpaq 1:55a6170b404f 256
nexpaq 1:55a6170b404f 257 if( NULL == ctx || NULL == ctx->cipher_info || NULL == olen )
nexpaq 1:55a6170b404f 258 {
nexpaq 1:55a6170b404f 259 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 260 }
nexpaq 1:55a6170b404f 261
nexpaq 1:55a6170b404f 262 *olen = 0;
nexpaq 1:55a6170b404f 263 block_size = mbedtls_cipher_get_block_size( ctx );
nexpaq 1:55a6170b404f 264
nexpaq 1:55a6170b404f 265 if( ctx->cipher_info->mode == MBEDTLS_MODE_ECB )
nexpaq 1:55a6170b404f 266 {
nexpaq 1:55a6170b404f 267 if( ilen != block_size )
nexpaq 1:55a6170b404f 268 return( MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED );
nexpaq 1:55a6170b404f 269
nexpaq 1:55a6170b404f 270 *olen = ilen;
nexpaq 1:55a6170b404f 271
nexpaq 1:55a6170b404f 272 if( 0 != ( ret = ctx->cipher_info->base->ecb_func( ctx->cipher_ctx,
nexpaq 1:55a6170b404f 273 ctx->operation, input, output ) ) )
nexpaq 1:55a6170b404f 274 {
nexpaq 1:55a6170b404f 275 return( ret );
nexpaq 1:55a6170b404f 276 }
nexpaq 1:55a6170b404f 277
nexpaq 1:55a6170b404f 278 return( 0 );
nexpaq 1:55a6170b404f 279 }
nexpaq 1:55a6170b404f 280
nexpaq 1:55a6170b404f 281 #if defined(MBEDTLS_GCM_C)
nexpaq 1:55a6170b404f 282 if( ctx->cipher_info->mode == MBEDTLS_MODE_GCM )
nexpaq 1:55a6170b404f 283 {
nexpaq 1:55a6170b404f 284 *olen = ilen;
nexpaq 1:55a6170b404f 285 return mbedtls_gcm_update( (mbedtls_gcm_context *) ctx->cipher_ctx, ilen, input,
nexpaq 1:55a6170b404f 286 output );
nexpaq 1:55a6170b404f 287 }
nexpaq 1:55a6170b404f 288 #endif
nexpaq 1:55a6170b404f 289
nexpaq 1:55a6170b404f 290 if ( 0 == block_size )
nexpaq 1:55a6170b404f 291 {
nexpaq 1:55a6170b404f 292 return MBEDTLS_ERR_CIPHER_INVALID_CONTEXT;
nexpaq 1:55a6170b404f 293 }
nexpaq 1:55a6170b404f 294
nexpaq 1:55a6170b404f 295 if( input == output &&
nexpaq 1:55a6170b404f 296 ( ctx->unprocessed_len != 0 || ilen % block_size ) )
nexpaq 1:55a6170b404f 297 {
nexpaq 1:55a6170b404f 298 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 299 }
nexpaq 1:55a6170b404f 300
nexpaq 1:55a6170b404f 301 #if defined(MBEDTLS_CIPHER_MODE_CBC)
nexpaq 1:55a6170b404f 302 if( ctx->cipher_info->mode == MBEDTLS_MODE_CBC )
nexpaq 1:55a6170b404f 303 {
nexpaq 1:55a6170b404f 304 size_t copy_len = 0;
nexpaq 1:55a6170b404f 305
nexpaq 1:55a6170b404f 306 /*
nexpaq 1:55a6170b404f 307 * If there is not enough data for a full block, cache it.
nexpaq 1:55a6170b404f 308 */
nexpaq 1:55a6170b404f 309 if( ( ctx->operation == MBEDTLS_DECRYPT &&
nexpaq 1:55a6170b404f 310 ilen + ctx->unprocessed_len <= block_size ) ||
nexpaq 1:55a6170b404f 311 ( ctx->operation == MBEDTLS_ENCRYPT &&
nexpaq 1:55a6170b404f 312 ilen + ctx->unprocessed_len < block_size ) )
nexpaq 1:55a6170b404f 313 {
nexpaq 1:55a6170b404f 314 memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ), input,
nexpaq 1:55a6170b404f 315 ilen );
nexpaq 1:55a6170b404f 316
nexpaq 1:55a6170b404f 317 ctx->unprocessed_len += ilen;
nexpaq 1:55a6170b404f 318 return( 0 );
nexpaq 1:55a6170b404f 319 }
nexpaq 1:55a6170b404f 320
nexpaq 1:55a6170b404f 321 /*
nexpaq 1:55a6170b404f 322 * Process cached data first
nexpaq 1:55a6170b404f 323 */
nexpaq 1:55a6170b404f 324 if( 0 != ctx->unprocessed_len )
nexpaq 1:55a6170b404f 325 {
nexpaq 1:55a6170b404f 326 copy_len = block_size - ctx->unprocessed_len;
nexpaq 1:55a6170b404f 327
nexpaq 1:55a6170b404f 328 memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ), input,
nexpaq 1:55a6170b404f 329 copy_len );
nexpaq 1:55a6170b404f 330
nexpaq 1:55a6170b404f 331 if( 0 != ( ret = ctx->cipher_info->base->cbc_func( ctx->cipher_ctx,
nexpaq 1:55a6170b404f 332 ctx->operation, block_size, ctx->iv,
nexpaq 1:55a6170b404f 333 ctx->unprocessed_data, output ) ) )
nexpaq 1:55a6170b404f 334 {
nexpaq 1:55a6170b404f 335 return( ret );
nexpaq 1:55a6170b404f 336 }
nexpaq 1:55a6170b404f 337
nexpaq 1:55a6170b404f 338 *olen += block_size;
nexpaq 1:55a6170b404f 339 output += block_size;
nexpaq 1:55a6170b404f 340 ctx->unprocessed_len = 0;
nexpaq 1:55a6170b404f 341
nexpaq 1:55a6170b404f 342 input += copy_len;
nexpaq 1:55a6170b404f 343 ilen -= copy_len;
nexpaq 1:55a6170b404f 344 }
nexpaq 1:55a6170b404f 345
nexpaq 1:55a6170b404f 346 /*
nexpaq 1:55a6170b404f 347 * Cache final, incomplete block
nexpaq 1:55a6170b404f 348 */
nexpaq 1:55a6170b404f 349 if( 0 != ilen )
nexpaq 1:55a6170b404f 350 {
nexpaq 1:55a6170b404f 351 if( 0 == block_size )
nexpaq 1:55a6170b404f 352 {
nexpaq 1:55a6170b404f 353 return MBEDTLS_ERR_CIPHER_INVALID_CONTEXT;
nexpaq 1:55a6170b404f 354 }
nexpaq 1:55a6170b404f 355
nexpaq 1:55a6170b404f 356 copy_len = ilen % block_size;
nexpaq 1:55a6170b404f 357 if( copy_len == 0 && ctx->operation == MBEDTLS_DECRYPT )
nexpaq 1:55a6170b404f 358 copy_len = block_size;
nexpaq 1:55a6170b404f 359
nexpaq 1:55a6170b404f 360 memcpy( ctx->unprocessed_data, &( input[ilen - copy_len] ),
nexpaq 1:55a6170b404f 361 copy_len );
nexpaq 1:55a6170b404f 362
nexpaq 1:55a6170b404f 363 ctx->unprocessed_len += copy_len;
nexpaq 1:55a6170b404f 364 ilen -= copy_len;
nexpaq 1:55a6170b404f 365 }
nexpaq 1:55a6170b404f 366
nexpaq 1:55a6170b404f 367 /*
nexpaq 1:55a6170b404f 368 * Process remaining full blocks
nexpaq 1:55a6170b404f 369 */
nexpaq 1:55a6170b404f 370 if( ilen )
nexpaq 1:55a6170b404f 371 {
nexpaq 1:55a6170b404f 372 if( 0 != ( ret = ctx->cipher_info->base->cbc_func( ctx->cipher_ctx,
nexpaq 1:55a6170b404f 373 ctx->operation, ilen, ctx->iv, input, output ) ) )
nexpaq 1:55a6170b404f 374 {
nexpaq 1:55a6170b404f 375 return( ret );
nexpaq 1:55a6170b404f 376 }
nexpaq 1:55a6170b404f 377
nexpaq 1:55a6170b404f 378 *olen += ilen;
nexpaq 1:55a6170b404f 379 }
nexpaq 1:55a6170b404f 380
nexpaq 1:55a6170b404f 381 return( 0 );
nexpaq 1:55a6170b404f 382 }
nexpaq 1:55a6170b404f 383 #endif /* MBEDTLS_CIPHER_MODE_CBC */
nexpaq 1:55a6170b404f 384
nexpaq 1:55a6170b404f 385 #if defined(MBEDTLS_CIPHER_MODE_CFB)
nexpaq 1:55a6170b404f 386 if( ctx->cipher_info->mode == MBEDTLS_MODE_CFB )
nexpaq 1:55a6170b404f 387 {
nexpaq 1:55a6170b404f 388 if( 0 != ( ret = ctx->cipher_info->base->cfb_func( ctx->cipher_ctx,
nexpaq 1:55a6170b404f 389 ctx->operation, ilen, &ctx->unprocessed_len, ctx->iv,
nexpaq 1:55a6170b404f 390 input, output ) ) )
nexpaq 1:55a6170b404f 391 {
nexpaq 1:55a6170b404f 392 return( ret );
nexpaq 1:55a6170b404f 393 }
nexpaq 1:55a6170b404f 394
nexpaq 1:55a6170b404f 395 *olen = ilen;
nexpaq 1:55a6170b404f 396
nexpaq 1:55a6170b404f 397 return( 0 );
nexpaq 1:55a6170b404f 398 }
nexpaq 1:55a6170b404f 399 #endif /* MBEDTLS_CIPHER_MODE_CFB */
nexpaq 1:55a6170b404f 400
nexpaq 1:55a6170b404f 401 #if defined(MBEDTLS_CIPHER_MODE_CTR)
nexpaq 1:55a6170b404f 402 if( ctx->cipher_info->mode == MBEDTLS_MODE_CTR )
nexpaq 1:55a6170b404f 403 {
nexpaq 1:55a6170b404f 404 if( 0 != ( ret = ctx->cipher_info->base->ctr_func( ctx->cipher_ctx,
nexpaq 1:55a6170b404f 405 ilen, &ctx->unprocessed_len, ctx->iv,
nexpaq 1:55a6170b404f 406 ctx->unprocessed_data, input, output ) ) )
nexpaq 1:55a6170b404f 407 {
nexpaq 1:55a6170b404f 408 return( ret );
nexpaq 1:55a6170b404f 409 }
nexpaq 1:55a6170b404f 410
nexpaq 1:55a6170b404f 411 *olen = ilen;
nexpaq 1:55a6170b404f 412
nexpaq 1:55a6170b404f 413 return( 0 );
nexpaq 1:55a6170b404f 414 }
nexpaq 1:55a6170b404f 415 #endif /* MBEDTLS_CIPHER_MODE_CTR */
nexpaq 1:55a6170b404f 416
nexpaq 1:55a6170b404f 417 #if defined(MBEDTLS_CIPHER_MODE_STREAM)
nexpaq 1:55a6170b404f 418 if( ctx->cipher_info->mode == MBEDTLS_MODE_STREAM )
nexpaq 1:55a6170b404f 419 {
nexpaq 1:55a6170b404f 420 if( 0 != ( ret = ctx->cipher_info->base->stream_func( ctx->cipher_ctx,
nexpaq 1:55a6170b404f 421 ilen, input, output ) ) )
nexpaq 1:55a6170b404f 422 {
nexpaq 1:55a6170b404f 423 return( ret );
nexpaq 1:55a6170b404f 424 }
nexpaq 1:55a6170b404f 425
nexpaq 1:55a6170b404f 426 *olen = ilen;
nexpaq 1:55a6170b404f 427
nexpaq 1:55a6170b404f 428 return( 0 );
nexpaq 1:55a6170b404f 429 }
nexpaq 1:55a6170b404f 430 #endif /* MBEDTLS_CIPHER_MODE_STREAM */
nexpaq 1:55a6170b404f 431
nexpaq 1:55a6170b404f 432 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
nexpaq 1:55a6170b404f 433 }
nexpaq 1:55a6170b404f 434
nexpaq 1:55a6170b404f 435 #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
nexpaq 1:55a6170b404f 436 #if defined(MBEDTLS_CIPHER_PADDING_PKCS7)
nexpaq 1:55a6170b404f 437 /*
nexpaq 1:55a6170b404f 438 * PKCS7 (and PKCS5) padding: fill with ll bytes, with ll = padding_len
nexpaq 1:55a6170b404f 439 */
nexpaq 1:55a6170b404f 440 static void add_pkcs_padding( unsigned char *output, size_t output_len,
nexpaq 1:55a6170b404f 441 size_t data_len )
nexpaq 1:55a6170b404f 442 {
nexpaq 1:55a6170b404f 443 size_t padding_len = output_len - data_len;
nexpaq 1:55a6170b404f 444 unsigned char i;
nexpaq 1:55a6170b404f 445
nexpaq 1:55a6170b404f 446 for( i = 0; i < padding_len; i++ )
nexpaq 1:55a6170b404f 447 output[data_len + i] = (unsigned char) padding_len;
nexpaq 1:55a6170b404f 448 }
nexpaq 1:55a6170b404f 449
nexpaq 1:55a6170b404f 450 static int get_pkcs_padding( unsigned char *input, size_t input_len,
nexpaq 1:55a6170b404f 451 size_t *data_len )
nexpaq 1:55a6170b404f 452 {
nexpaq 1:55a6170b404f 453 size_t i, pad_idx;
nexpaq 1:55a6170b404f 454 unsigned char padding_len, bad = 0;
nexpaq 1:55a6170b404f 455
nexpaq 1:55a6170b404f 456 if( NULL == input || NULL == data_len )
nexpaq 1:55a6170b404f 457 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 458
nexpaq 1:55a6170b404f 459 padding_len = input[input_len - 1];
nexpaq 1:55a6170b404f 460 *data_len = input_len - padding_len;
nexpaq 1:55a6170b404f 461
nexpaq 1:55a6170b404f 462 /* Avoid logical || since it results in a branch */
nexpaq 1:55a6170b404f 463 bad |= padding_len > input_len;
nexpaq 1:55a6170b404f 464 bad |= padding_len == 0;
nexpaq 1:55a6170b404f 465
nexpaq 1:55a6170b404f 466 /* The number of bytes checked must be independent of padding_len,
nexpaq 1:55a6170b404f 467 * so pick input_len, which is usually 8 or 16 (one block) */
nexpaq 1:55a6170b404f 468 pad_idx = input_len - padding_len;
nexpaq 1:55a6170b404f 469 for( i = 0; i < input_len; i++ )
nexpaq 1:55a6170b404f 470 bad |= ( input[i] ^ padding_len ) * ( i >= pad_idx );
nexpaq 1:55a6170b404f 471
nexpaq 1:55a6170b404f 472 return( MBEDTLS_ERR_CIPHER_INVALID_PADDING * ( bad != 0 ) );
nexpaq 1:55a6170b404f 473 }
nexpaq 1:55a6170b404f 474 #endif /* MBEDTLS_CIPHER_PADDING_PKCS7 */
nexpaq 1:55a6170b404f 475
nexpaq 1:55a6170b404f 476 #if defined(MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS)
nexpaq 1:55a6170b404f 477 /*
nexpaq 1:55a6170b404f 478 * One and zeros padding: fill with 80 00 ... 00
nexpaq 1:55a6170b404f 479 */
nexpaq 1:55a6170b404f 480 static void add_one_and_zeros_padding( unsigned char *output,
nexpaq 1:55a6170b404f 481 size_t output_len, size_t data_len )
nexpaq 1:55a6170b404f 482 {
nexpaq 1:55a6170b404f 483 size_t padding_len = output_len - data_len;
nexpaq 1:55a6170b404f 484 unsigned char i = 0;
nexpaq 1:55a6170b404f 485
nexpaq 1:55a6170b404f 486 output[data_len] = 0x80;
nexpaq 1:55a6170b404f 487 for( i = 1; i < padding_len; i++ )
nexpaq 1:55a6170b404f 488 output[data_len + i] = 0x00;
nexpaq 1:55a6170b404f 489 }
nexpaq 1:55a6170b404f 490
nexpaq 1:55a6170b404f 491 static int get_one_and_zeros_padding( unsigned char *input, size_t input_len,
nexpaq 1:55a6170b404f 492 size_t *data_len )
nexpaq 1:55a6170b404f 493 {
nexpaq 1:55a6170b404f 494 size_t i;
nexpaq 1:55a6170b404f 495 unsigned char done = 0, prev_done, bad;
nexpaq 1:55a6170b404f 496
nexpaq 1:55a6170b404f 497 if( NULL == input || NULL == data_len )
nexpaq 1:55a6170b404f 498 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 499
nexpaq 1:55a6170b404f 500 bad = 0xFF;
nexpaq 1:55a6170b404f 501 *data_len = 0;
nexpaq 1:55a6170b404f 502 for( i = input_len; i > 0; i-- )
nexpaq 1:55a6170b404f 503 {
nexpaq 1:55a6170b404f 504 prev_done = done;
nexpaq 1:55a6170b404f 505 done |= ( input[i-1] != 0 );
nexpaq 1:55a6170b404f 506 *data_len |= ( i - 1 ) * ( done != prev_done );
nexpaq 1:55a6170b404f 507 bad &= ( input[i-1] ^ 0x80 ) | ( done == prev_done );
nexpaq 1:55a6170b404f 508 }
nexpaq 1:55a6170b404f 509
nexpaq 1:55a6170b404f 510 return( MBEDTLS_ERR_CIPHER_INVALID_PADDING * ( bad != 0 ) );
nexpaq 1:55a6170b404f 511
nexpaq 1:55a6170b404f 512 }
nexpaq 1:55a6170b404f 513 #endif /* MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS */
nexpaq 1:55a6170b404f 514
nexpaq 1:55a6170b404f 515 #if defined(MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN)
nexpaq 1:55a6170b404f 516 /*
nexpaq 1:55a6170b404f 517 * Zeros and len padding: fill with 00 ... 00 ll, where ll is padding length
nexpaq 1:55a6170b404f 518 */
nexpaq 1:55a6170b404f 519 static void add_zeros_and_len_padding( unsigned char *output,
nexpaq 1:55a6170b404f 520 size_t output_len, size_t data_len )
nexpaq 1:55a6170b404f 521 {
nexpaq 1:55a6170b404f 522 size_t padding_len = output_len - data_len;
nexpaq 1:55a6170b404f 523 unsigned char i = 0;
nexpaq 1:55a6170b404f 524
nexpaq 1:55a6170b404f 525 for( i = 1; i < padding_len; i++ )
nexpaq 1:55a6170b404f 526 output[data_len + i - 1] = 0x00;
nexpaq 1:55a6170b404f 527 output[output_len - 1] = (unsigned char) padding_len;
nexpaq 1:55a6170b404f 528 }
nexpaq 1:55a6170b404f 529
nexpaq 1:55a6170b404f 530 static int get_zeros_and_len_padding( unsigned char *input, size_t input_len,
nexpaq 1:55a6170b404f 531 size_t *data_len )
nexpaq 1:55a6170b404f 532 {
nexpaq 1:55a6170b404f 533 size_t i, pad_idx;
nexpaq 1:55a6170b404f 534 unsigned char padding_len, bad = 0;
nexpaq 1:55a6170b404f 535
nexpaq 1:55a6170b404f 536 if( NULL == input || NULL == data_len )
nexpaq 1:55a6170b404f 537 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 538
nexpaq 1:55a6170b404f 539 padding_len = input[input_len - 1];
nexpaq 1:55a6170b404f 540 *data_len = input_len - padding_len;
nexpaq 1:55a6170b404f 541
nexpaq 1:55a6170b404f 542 /* Avoid logical || since it results in a branch */
nexpaq 1:55a6170b404f 543 bad |= padding_len > input_len;
nexpaq 1:55a6170b404f 544 bad |= padding_len == 0;
nexpaq 1:55a6170b404f 545
nexpaq 1:55a6170b404f 546 /* The number of bytes checked must be independent of padding_len */
nexpaq 1:55a6170b404f 547 pad_idx = input_len - padding_len;
nexpaq 1:55a6170b404f 548 for( i = 0; i < input_len - 1; i++ )
nexpaq 1:55a6170b404f 549 bad |= input[i] * ( i >= pad_idx );
nexpaq 1:55a6170b404f 550
nexpaq 1:55a6170b404f 551 return( MBEDTLS_ERR_CIPHER_INVALID_PADDING * ( bad != 0 ) );
nexpaq 1:55a6170b404f 552 }
nexpaq 1:55a6170b404f 553 #endif /* MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN */
nexpaq 1:55a6170b404f 554
nexpaq 1:55a6170b404f 555 #if defined(MBEDTLS_CIPHER_PADDING_ZEROS)
nexpaq 1:55a6170b404f 556 /*
nexpaq 1:55a6170b404f 557 * Zero padding: fill with 00 ... 00
nexpaq 1:55a6170b404f 558 */
nexpaq 1:55a6170b404f 559 static void add_zeros_padding( unsigned char *output,
nexpaq 1:55a6170b404f 560 size_t output_len, size_t data_len )
nexpaq 1:55a6170b404f 561 {
nexpaq 1:55a6170b404f 562 size_t i;
nexpaq 1:55a6170b404f 563
nexpaq 1:55a6170b404f 564 for( i = data_len; i < output_len; i++ )
nexpaq 1:55a6170b404f 565 output[i] = 0x00;
nexpaq 1:55a6170b404f 566 }
nexpaq 1:55a6170b404f 567
nexpaq 1:55a6170b404f 568 static int get_zeros_padding( unsigned char *input, size_t input_len,
nexpaq 1:55a6170b404f 569 size_t *data_len )
nexpaq 1:55a6170b404f 570 {
nexpaq 1:55a6170b404f 571 size_t i;
nexpaq 1:55a6170b404f 572 unsigned char done = 0, prev_done;
nexpaq 1:55a6170b404f 573
nexpaq 1:55a6170b404f 574 if( NULL == input || NULL == data_len )
nexpaq 1:55a6170b404f 575 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 576
nexpaq 1:55a6170b404f 577 *data_len = 0;
nexpaq 1:55a6170b404f 578 for( i = input_len; i > 0; i-- )
nexpaq 1:55a6170b404f 579 {
nexpaq 1:55a6170b404f 580 prev_done = done;
nexpaq 1:55a6170b404f 581 done |= ( input[i-1] != 0 );
nexpaq 1:55a6170b404f 582 *data_len |= i * ( done != prev_done );
nexpaq 1:55a6170b404f 583 }
nexpaq 1:55a6170b404f 584
nexpaq 1:55a6170b404f 585 return( 0 );
nexpaq 1:55a6170b404f 586 }
nexpaq 1:55a6170b404f 587 #endif /* MBEDTLS_CIPHER_PADDING_ZEROS */
nexpaq 1:55a6170b404f 588
nexpaq 1:55a6170b404f 589 /*
nexpaq 1:55a6170b404f 590 * No padding: don't pad :)
nexpaq 1:55a6170b404f 591 *
nexpaq 1:55a6170b404f 592 * There is no add_padding function (check for NULL in mbedtls_cipher_finish)
nexpaq 1:55a6170b404f 593 * but a trivial get_padding function
nexpaq 1:55a6170b404f 594 */
nexpaq 1:55a6170b404f 595 static int get_no_padding( unsigned char *input, size_t input_len,
nexpaq 1:55a6170b404f 596 size_t *data_len )
nexpaq 1:55a6170b404f 597 {
nexpaq 1:55a6170b404f 598 if( NULL == input || NULL == data_len )
nexpaq 1:55a6170b404f 599 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 600
nexpaq 1:55a6170b404f 601 *data_len = input_len;
nexpaq 1:55a6170b404f 602
nexpaq 1:55a6170b404f 603 return( 0 );
nexpaq 1:55a6170b404f 604 }
nexpaq 1:55a6170b404f 605 #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
nexpaq 1:55a6170b404f 606
nexpaq 1:55a6170b404f 607 int mbedtls_cipher_finish( mbedtls_cipher_context_t *ctx,
nexpaq 1:55a6170b404f 608 unsigned char *output, size_t *olen )
nexpaq 1:55a6170b404f 609 {
nexpaq 1:55a6170b404f 610 if( NULL == ctx || NULL == ctx->cipher_info || NULL == olen )
nexpaq 1:55a6170b404f 611 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 612
nexpaq 1:55a6170b404f 613 *olen = 0;
nexpaq 1:55a6170b404f 614
nexpaq 1:55a6170b404f 615 if( MBEDTLS_MODE_CFB == ctx->cipher_info->mode ||
nexpaq 1:55a6170b404f 616 MBEDTLS_MODE_CTR == ctx->cipher_info->mode ||
nexpaq 1:55a6170b404f 617 MBEDTLS_MODE_GCM == ctx->cipher_info->mode ||
nexpaq 1:55a6170b404f 618 MBEDTLS_MODE_STREAM == ctx->cipher_info->mode )
nexpaq 1:55a6170b404f 619 {
nexpaq 1:55a6170b404f 620 return( 0 );
nexpaq 1:55a6170b404f 621 }
nexpaq 1:55a6170b404f 622
nexpaq 1:55a6170b404f 623 if( MBEDTLS_MODE_ECB == ctx->cipher_info->mode )
nexpaq 1:55a6170b404f 624 {
nexpaq 1:55a6170b404f 625 if( ctx->unprocessed_len != 0 )
nexpaq 1:55a6170b404f 626 return( MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED );
nexpaq 1:55a6170b404f 627
nexpaq 1:55a6170b404f 628 return( 0 );
nexpaq 1:55a6170b404f 629 }
nexpaq 1:55a6170b404f 630
nexpaq 1:55a6170b404f 631 #if defined(MBEDTLS_CIPHER_MODE_CBC)
nexpaq 1:55a6170b404f 632 if( MBEDTLS_MODE_CBC == ctx->cipher_info->mode )
nexpaq 1:55a6170b404f 633 {
nexpaq 1:55a6170b404f 634 int ret = 0;
nexpaq 1:55a6170b404f 635
nexpaq 1:55a6170b404f 636 if( MBEDTLS_ENCRYPT == ctx->operation )
nexpaq 1:55a6170b404f 637 {
nexpaq 1:55a6170b404f 638 /* check for 'no padding' mode */
nexpaq 1:55a6170b404f 639 if( NULL == ctx->add_padding )
nexpaq 1:55a6170b404f 640 {
nexpaq 1:55a6170b404f 641 if( 0 != ctx->unprocessed_len )
nexpaq 1:55a6170b404f 642 return( MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED );
nexpaq 1:55a6170b404f 643
nexpaq 1:55a6170b404f 644 return( 0 );
nexpaq 1:55a6170b404f 645 }
nexpaq 1:55a6170b404f 646
nexpaq 1:55a6170b404f 647 ctx->add_padding( ctx->unprocessed_data, mbedtls_cipher_get_iv_size( ctx ),
nexpaq 1:55a6170b404f 648 ctx->unprocessed_len );
nexpaq 1:55a6170b404f 649 }
nexpaq 1:55a6170b404f 650 else if( mbedtls_cipher_get_block_size( ctx ) != ctx->unprocessed_len )
nexpaq 1:55a6170b404f 651 {
nexpaq 1:55a6170b404f 652 /*
nexpaq 1:55a6170b404f 653 * For decrypt operations, expect a full block,
nexpaq 1:55a6170b404f 654 * or an empty block if no padding
nexpaq 1:55a6170b404f 655 */
nexpaq 1:55a6170b404f 656 if( NULL == ctx->add_padding && 0 == ctx->unprocessed_len )
nexpaq 1:55a6170b404f 657 return( 0 );
nexpaq 1:55a6170b404f 658
nexpaq 1:55a6170b404f 659 return( MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED );
nexpaq 1:55a6170b404f 660 }
nexpaq 1:55a6170b404f 661
nexpaq 1:55a6170b404f 662 /* cipher block */
nexpaq 1:55a6170b404f 663 if( 0 != ( ret = ctx->cipher_info->base->cbc_func( ctx->cipher_ctx,
nexpaq 1:55a6170b404f 664 ctx->operation, mbedtls_cipher_get_block_size( ctx ), ctx->iv,
nexpaq 1:55a6170b404f 665 ctx->unprocessed_data, output ) ) )
nexpaq 1:55a6170b404f 666 {
nexpaq 1:55a6170b404f 667 return( ret );
nexpaq 1:55a6170b404f 668 }
nexpaq 1:55a6170b404f 669
nexpaq 1:55a6170b404f 670 /* Set output size for decryption */
nexpaq 1:55a6170b404f 671 if( MBEDTLS_DECRYPT == ctx->operation )
nexpaq 1:55a6170b404f 672 return ctx->get_padding( output, mbedtls_cipher_get_block_size( ctx ),
nexpaq 1:55a6170b404f 673 olen );
nexpaq 1:55a6170b404f 674
nexpaq 1:55a6170b404f 675 /* Set output size for encryption */
nexpaq 1:55a6170b404f 676 *olen = mbedtls_cipher_get_block_size( ctx );
nexpaq 1:55a6170b404f 677 return( 0 );
nexpaq 1:55a6170b404f 678 }
nexpaq 1:55a6170b404f 679 #else
nexpaq 1:55a6170b404f 680 ((void) output);
nexpaq 1:55a6170b404f 681 #endif /* MBEDTLS_CIPHER_MODE_CBC */
nexpaq 1:55a6170b404f 682
nexpaq 1:55a6170b404f 683 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
nexpaq 1:55a6170b404f 684 }
nexpaq 1:55a6170b404f 685
nexpaq 1:55a6170b404f 686 #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
nexpaq 1:55a6170b404f 687 int mbedtls_cipher_set_padding_mode( mbedtls_cipher_context_t *ctx, mbedtls_cipher_padding_t mode )
nexpaq 1:55a6170b404f 688 {
nexpaq 1:55a6170b404f 689 if( NULL == ctx ||
nexpaq 1:55a6170b404f 690 MBEDTLS_MODE_CBC != ctx->cipher_info->mode )
nexpaq 1:55a6170b404f 691 {
nexpaq 1:55a6170b404f 692 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 693 }
nexpaq 1:55a6170b404f 694
nexpaq 1:55a6170b404f 695 switch( mode )
nexpaq 1:55a6170b404f 696 {
nexpaq 1:55a6170b404f 697 #if defined(MBEDTLS_CIPHER_PADDING_PKCS7)
nexpaq 1:55a6170b404f 698 case MBEDTLS_PADDING_PKCS7:
nexpaq 1:55a6170b404f 699 ctx->add_padding = add_pkcs_padding;
nexpaq 1:55a6170b404f 700 ctx->get_padding = get_pkcs_padding;
nexpaq 1:55a6170b404f 701 break;
nexpaq 1:55a6170b404f 702 #endif
nexpaq 1:55a6170b404f 703 #if defined(MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS)
nexpaq 1:55a6170b404f 704 case MBEDTLS_PADDING_ONE_AND_ZEROS:
nexpaq 1:55a6170b404f 705 ctx->add_padding = add_one_and_zeros_padding;
nexpaq 1:55a6170b404f 706 ctx->get_padding = get_one_and_zeros_padding;
nexpaq 1:55a6170b404f 707 break;
nexpaq 1:55a6170b404f 708 #endif
nexpaq 1:55a6170b404f 709 #if defined(MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN)
nexpaq 1:55a6170b404f 710 case MBEDTLS_PADDING_ZEROS_AND_LEN:
nexpaq 1:55a6170b404f 711 ctx->add_padding = add_zeros_and_len_padding;
nexpaq 1:55a6170b404f 712 ctx->get_padding = get_zeros_and_len_padding;
nexpaq 1:55a6170b404f 713 break;
nexpaq 1:55a6170b404f 714 #endif
nexpaq 1:55a6170b404f 715 #if defined(MBEDTLS_CIPHER_PADDING_ZEROS)
nexpaq 1:55a6170b404f 716 case MBEDTLS_PADDING_ZEROS:
nexpaq 1:55a6170b404f 717 ctx->add_padding = add_zeros_padding;
nexpaq 1:55a6170b404f 718 ctx->get_padding = get_zeros_padding;
nexpaq 1:55a6170b404f 719 break;
nexpaq 1:55a6170b404f 720 #endif
nexpaq 1:55a6170b404f 721 case MBEDTLS_PADDING_NONE:
nexpaq 1:55a6170b404f 722 ctx->add_padding = NULL;
nexpaq 1:55a6170b404f 723 ctx->get_padding = get_no_padding;
nexpaq 1:55a6170b404f 724 break;
nexpaq 1:55a6170b404f 725
nexpaq 1:55a6170b404f 726 default:
nexpaq 1:55a6170b404f 727 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
nexpaq 1:55a6170b404f 728 }
nexpaq 1:55a6170b404f 729
nexpaq 1:55a6170b404f 730 return( 0 );
nexpaq 1:55a6170b404f 731 }
nexpaq 1:55a6170b404f 732 #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
nexpaq 1:55a6170b404f 733
nexpaq 1:55a6170b404f 734 #if defined(MBEDTLS_GCM_C)
nexpaq 1:55a6170b404f 735 int mbedtls_cipher_write_tag( mbedtls_cipher_context_t *ctx,
nexpaq 1:55a6170b404f 736 unsigned char *tag, size_t tag_len )
nexpaq 1:55a6170b404f 737 {
nexpaq 1:55a6170b404f 738 if( NULL == ctx || NULL == ctx->cipher_info || NULL == tag )
nexpaq 1:55a6170b404f 739 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 740
nexpaq 1:55a6170b404f 741 if( MBEDTLS_ENCRYPT != ctx->operation )
nexpaq 1:55a6170b404f 742 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 743
nexpaq 1:55a6170b404f 744 if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
nexpaq 1:55a6170b404f 745 return mbedtls_gcm_finish( (mbedtls_gcm_context *) ctx->cipher_ctx, tag, tag_len );
nexpaq 1:55a6170b404f 746
nexpaq 1:55a6170b404f 747 return( 0 );
nexpaq 1:55a6170b404f 748 }
nexpaq 1:55a6170b404f 749
nexpaq 1:55a6170b404f 750 int mbedtls_cipher_check_tag( mbedtls_cipher_context_t *ctx,
nexpaq 1:55a6170b404f 751 const unsigned char *tag, size_t tag_len )
nexpaq 1:55a6170b404f 752 {
nexpaq 1:55a6170b404f 753 int ret;
nexpaq 1:55a6170b404f 754
nexpaq 1:55a6170b404f 755 if( NULL == ctx || NULL == ctx->cipher_info ||
nexpaq 1:55a6170b404f 756 MBEDTLS_DECRYPT != ctx->operation )
nexpaq 1:55a6170b404f 757 {
nexpaq 1:55a6170b404f 758 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 759 }
nexpaq 1:55a6170b404f 760
nexpaq 1:55a6170b404f 761 if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
nexpaq 1:55a6170b404f 762 {
nexpaq 1:55a6170b404f 763 unsigned char check_tag[16];
nexpaq 1:55a6170b404f 764 size_t i;
nexpaq 1:55a6170b404f 765 int diff;
nexpaq 1:55a6170b404f 766
nexpaq 1:55a6170b404f 767 if( tag_len > sizeof( check_tag ) )
nexpaq 1:55a6170b404f 768 return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
nexpaq 1:55a6170b404f 769
nexpaq 1:55a6170b404f 770 if( 0 != ( ret = mbedtls_gcm_finish( (mbedtls_gcm_context *) ctx->cipher_ctx,
nexpaq 1:55a6170b404f 771 check_tag, tag_len ) ) )
nexpaq 1:55a6170b404f 772 {
nexpaq 1:55a6170b404f 773 return( ret );
nexpaq 1:55a6170b404f 774 }
nexpaq 1:55a6170b404f 775
nexpaq 1:55a6170b404f 776 /* Check the tag in "constant-time" */
nexpaq 1:55a6170b404f 777 for( diff = 0, i = 0; i < tag_len; i++ )
nexpaq 1:55a6170b404f 778 diff |= tag[i] ^ check_tag[i];
nexpaq 1:55a6170b404f 779
nexpaq 1:55a6170b404f 780 if( diff != 0 )
nexpaq 1:55a6170b404f 781 return( MBEDTLS_ERR_CIPHER_AUTH_FAILED );
nexpaq 1:55a6170b404f 782
nexpaq 1:55a6170b404f 783 return( 0 );
nexpaq 1:55a6170b404f 784 }
nexpaq 1:55a6170b404f 785
nexpaq 1:55a6170b404f 786 return( 0 );
nexpaq 1:55a6170b404f 787 }
nexpaq 1:55a6170b404f 788 #endif /* MBEDTLS_GCM_C */
nexpaq 1:55a6170b404f 789
nexpaq 1:55a6170b404f 790 /*
nexpaq 1:55a6170b404f 791 * Packet-oriented wrapper for non-AEAD modes
nexpaq 1:55a6170b404f 792 */
nexpaq 1:55a6170b404f 793 int mbedtls_cipher_crypt( mbedtls_cipher_context_t *ctx,
nexpaq 1:55a6170b404f 794 const unsigned char *iv, size_t iv_len,
nexpaq 1:55a6170b404f 795 const unsigned char *input, size_t ilen,
nexpaq 1:55a6170b404f 796 unsigned char *output, size_t *olen )
nexpaq 1:55a6170b404f 797 {
nexpaq 1:55a6170b404f 798 int ret;
nexpaq 1:55a6170b404f 799 size_t finish_olen;
nexpaq 1:55a6170b404f 800
nexpaq 1:55a6170b404f 801 if( ( ret = mbedtls_cipher_set_iv( ctx, iv, iv_len ) ) != 0 )
nexpaq 1:55a6170b404f 802 return( ret );
nexpaq 1:55a6170b404f 803
nexpaq 1:55a6170b404f 804 if( ( ret = mbedtls_cipher_reset( ctx ) ) != 0 )
nexpaq 1:55a6170b404f 805 return( ret );
nexpaq 1:55a6170b404f 806
nexpaq 1:55a6170b404f 807 if( ( ret = mbedtls_cipher_update( ctx, input, ilen, output, olen ) ) != 0 )
nexpaq 1:55a6170b404f 808 return( ret );
nexpaq 1:55a6170b404f 809
nexpaq 1:55a6170b404f 810 if( ( ret = mbedtls_cipher_finish( ctx, output + *olen, &finish_olen ) ) != 0 )
nexpaq 1:55a6170b404f 811 return( ret );
nexpaq 1:55a6170b404f 812
nexpaq 1:55a6170b404f 813 *olen += finish_olen;
nexpaq 1:55a6170b404f 814
nexpaq 1:55a6170b404f 815 return( 0 );
nexpaq 1:55a6170b404f 816 }
nexpaq 1:55a6170b404f 817
nexpaq 1:55a6170b404f 818 #if defined(MBEDTLS_CIPHER_MODE_AEAD)
nexpaq 1:55a6170b404f 819 /*
nexpaq 1:55a6170b404f 820 * Packet-oriented encryption for AEAD modes
nexpaq 1:55a6170b404f 821 */
nexpaq 1:55a6170b404f 822 int mbedtls_cipher_auth_encrypt( mbedtls_cipher_context_t *ctx,
nexpaq 1:55a6170b404f 823 const unsigned char *iv, size_t iv_len,
nexpaq 1:55a6170b404f 824 const unsigned char *ad, size_t ad_len,
nexpaq 1:55a6170b404f 825 const unsigned char *input, size_t ilen,
nexpaq 1:55a6170b404f 826 unsigned char *output, size_t *olen,
nexpaq 1:55a6170b404f 827 unsigned char *tag, size_t tag_len )
nexpaq 1:55a6170b404f 828 {
nexpaq 1:55a6170b404f 829 #if defined(MBEDTLS_GCM_C)
nexpaq 1:55a6170b404f 830 if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
nexpaq 1:55a6170b404f 831 {
nexpaq 1:55a6170b404f 832 *olen = ilen;
nexpaq 1:55a6170b404f 833 return( mbedtls_gcm_crypt_and_tag( ctx->cipher_ctx, MBEDTLS_GCM_ENCRYPT, ilen,
nexpaq 1:55a6170b404f 834 iv, iv_len, ad, ad_len, input, output,
nexpaq 1:55a6170b404f 835 tag_len, tag ) );
nexpaq 1:55a6170b404f 836 }
nexpaq 1:55a6170b404f 837 #endif /* MBEDTLS_GCM_C */
nexpaq 1:55a6170b404f 838 #if defined(MBEDTLS_CCM_C)
nexpaq 1:55a6170b404f 839 if( MBEDTLS_MODE_CCM == ctx->cipher_info->mode )
nexpaq 1:55a6170b404f 840 {
nexpaq 1:55a6170b404f 841 *olen = ilen;
nexpaq 1:55a6170b404f 842 return( mbedtls_ccm_encrypt_and_tag( ctx->cipher_ctx, ilen,
nexpaq 1:55a6170b404f 843 iv, iv_len, ad, ad_len, input, output,
nexpaq 1:55a6170b404f 844 tag, tag_len ) );
nexpaq 1:55a6170b404f 845 }
nexpaq 1:55a6170b404f 846 #endif /* MBEDTLS_CCM_C */
nexpaq 1:55a6170b404f 847
nexpaq 1:55a6170b404f 848 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
nexpaq 1:55a6170b404f 849 }
nexpaq 1:55a6170b404f 850
nexpaq 1:55a6170b404f 851 /*
nexpaq 1:55a6170b404f 852 * Packet-oriented decryption for AEAD modes
nexpaq 1:55a6170b404f 853 */
nexpaq 1:55a6170b404f 854 int mbedtls_cipher_auth_decrypt( mbedtls_cipher_context_t *ctx,
nexpaq 1:55a6170b404f 855 const unsigned char *iv, size_t iv_len,
nexpaq 1:55a6170b404f 856 const unsigned char *ad, size_t ad_len,
nexpaq 1:55a6170b404f 857 const unsigned char *input, size_t ilen,
nexpaq 1:55a6170b404f 858 unsigned char *output, size_t *olen,
nexpaq 1:55a6170b404f 859 const unsigned char *tag, size_t tag_len )
nexpaq 1:55a6170b404f 860 {
nexpaq 1:55a6170b404f 861 #if defined(MBEDTLS_GCM_C)
nexpaq 1:55a6170b404f 862 if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
nexpaq 1:55a6170b404f 863 {
nexpaq 1:55a6170b404f 864 int ret;
nexpaq 1:55a6170b404f 865
nexpaq 1:55a6170b404f 866 *olen = ilen;
nexpaq 1:55a6170b404f 867 ret = mbedtls_gcm_auth_decrypt( ctx->cipher_ctx, ilen,
nexpaq 1:55a6170b404f 868 iv, iv_len, ad, ad_len,
nexpaq 1:55a6170b404f 869 tag, tag_len, input, output );
nexpaq 1:55a6170b404f 870
nexpaq 1:55a6170b404f 871 if( ret == MBEDTLS_ERR_GCM_AUTH_FAILED )
nexpaq 1:55a6170b404f 872 ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED;
nexpaq 1:55a6170b404f 873
nexpaq 1:55a6170b404f 874 return( ret );
nexpaq 1:55a6170b404f 875 }
nexpaq 1:55a6170b404f 876 #endif /* MBEDTLS_GCM_C */
nexpaq 1:55a6170b404f 877 #if defined(MBEDTLS_CCM_C)
nexpaq 1:55a6170b404f 878 if( MBEDTLS_MODE_CCM == ctx->cipher_info->mode )
nexpaq 1:55a6170b404f 879 {
nexpaq 1:55a6170b404f 880 int ret;
nexpaq 1:55a6170b404f 881
nexpaq 1:55a6170b404f 882 *olen = ilen;
nexpaq 1:55a6170b404f 883 ret = mbedtls_ccm_auth_decrypt( ctx->cipher_ctx, ilen,
nexpaq 1:55a6170b404f 884 iv, iv_len, ad, ad_len,
nexpaq 1:55a6170b404f 885 input, output, tag, tag_len );
nexpaq 1:55a6170b404f 886
nexpaq 1:55a6170b404f 887 if( ret == MBEDTLS_ERR_CCM_AUTH_FAILED )
nexpaq 1:55a6170b404f 888 ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED;
nexpaq 1:55a6170b404f 889
nexpaq 1:55a6170b404f 890 return( ret );
nexpaq 1:55a6170b404f 891 }
nexpaq 1:55a6170b404f 892 #endif /* MBEDTLS_CCM_C */
nexpaq 1:55a6170b404f 893
nexpaq 1:55a6170b404f 894 return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
nexpaq 1:55a6170b404f 895 }
nexpaq 1:55a6170b404f 896 #endif /* MBEDTLS_CIPHER_MODE_AEAD */
nexpaq 1:55a6170b404f 897
nexpaq 1:55a6170b404f 898 #endif /* MBEDTLS_CIPHER_C */