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features/mbedtls/src/ccm.c@0:098463de4c5d, 2017-01-25 (annotated)

Committer:
group-onsemi
Date:
Wed Jan 25 20:34:15 2017 +0000
Revision:
0:098463de4c5d
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
group-onsemi 0:098463de4c5d 1 /*
group-onsemi 0:098463de4c5d 2 * NIST SP800-38C compliant CCM implementation
group-onsemi 0:098463de4c5d 3 *
group-onsemi 0:098463de4c5d 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
group-onsemi 0:098463de4c5d 5 * SPDX-License-Identifier: Apache-2.0
group-onsemi 0:098463de4c5d 6 *
group-onsemi 0:098463de4c5d 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
group-onsemi 0:098463de4c5d 8 * not use this file except in compliance with the License.
group-onsemi 0:098463de4c5d 9 * You may obtain a copy of the License at
group-onsemi 0:098463de4c5d 10 *
group-onsemi 0:098463de4c5d 11 * http://www.apache.org/licenses/LICENSE-2.0
group-onsemi 0:098463de4c5d 12 *
group-onsemi 0:098463de4c5d 13 * Unless required by applicable law or agreed to in writing, software
group-onsemi 0:098463de4c5d 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
group-onsemi 0:098463de4c5d 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
group-onsemi 0:098463de4c5d 16 * See the License for the specific language governing permissions and
group-onsemi 0:098463de4c5d 17 * limitations under the License.
group-onsemi 0:098463de4c5d 18 *
group-onsemi 0:098463de4c5d 19 * This file is part of mbed TLS (https://tls.mbed.org)
group-onsemi 0:098463de4c5d 20 */
group-onsemi 0:098463de4c5d 21
group-onsemi 0:098463de4c5d 22 /*
group-onsemi 0:098463de4c5d 23 * Definition of CCM:
group-onsemi 0:098463de4c5d 24 * http://csrc.nist.gov/publications/nistpubs/800-38C/SP800-38C_updated-July20_2007.pdf
group-onsemi 0:098463de4c5d 25 * RFC 3610 "Counter with CBC-MAC (CCM)"
group-onsemi 0:098463de4c5d 26 *
group-onsemi 0:098463de4c5d 27 * Related:
group-onsemi 0:098463de4c5d 28 * RFC 5116 "An Interface and Algorithms for Authenticated Encryption"
group-onsemi 0:098463de4c5d 29 */
group-onsemi 0:098463de4c5d 30
group-onsemi 0:098463de4c5d 31 #if !defined(MBEDTLS_CONFIG_FILE)
group-onsemi 0:098463de4c5d 32 #include "mbedtls/config.h"
group-onsemi 0:098463de4c5d 33 #else
group-onsemi 0:098463de4c5d 34 #include MBEDTLS_CONFIG_FILE
group-onsemi 0:098463de4c5d 35 #endif
group-onsemi 0:098463de4c5d 36
group-onsemi 0:098463de4c5d 37 #if defined(MBEDTLS_CCM_C)
group-onsemi 0:098463de4c5d 38
group-onsemi 0:098463de4c5d 39 #include "mbedtls/ccm.h"
group-onsemi 0:098463de4c5d 40
group-onsemi 0:098463de4c5d 41 #include <string.h>
group-onsemi 0:098463de4c5d 42
group-onsemi 0:098463de4c5d 43 #if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
group-onsemi 0:098463de4c5d 44 #if defined(MBEDTLS_PLATFORM_C)
group-onsemi 0:098463de4c5d 45 #include "mbedtls/platform.h"
group-onsemi 0:098463de4c5d 46 #else
group-onsemi 0:098463de4c5d 47 #include <stdio.h>
group-onsemi 0:098463de4c5d 48 #define mbedtls_printf printf
group-onsemi 0:098463de4c5d 49 #endif /* MBEDTLS_PLATFORM_C */
group-onsemi 0:098463de4c5d 50 #endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
group-onsemi 0:098463de4c5d 51
group-onsemi 0:098463de4c5d 52 /* Implementation that should never be optimized out by the compiler */
group-onsemi 0:098463de4c5d 53 static void mbedtls_zeroize( void *v, size_t n ) {
group-onsemi 0:098463de4c5d 54 volatile unsigned char *p = (unsigned char*)v; while( n-- ) *p++ = 0;
group-onsemi 0:098463de4c5d 55 }
group-onsemi 0:098463de4c5d 56
group-onsemi 0:098463de4c5d 57 #define CCM_ENCRYPT 0
group-onsemi 0:098463de4c5d 58 #define CCM_DECRYPT 1
group-onsemi 0:098463de4c5d 59
group-onsemi 0:098463de4c5d 60 /*
group-onsemi 0:098463de4c5d 61 * Initialize context
group-onsemi 0:098463de4c5d 62 */
group-onsemi 0:098463de4c5d 63 void mbedtls_ccm_init( mbedtls_ccm_context *ctx )
group-onsemi 0:098463de4c5d 64 {
group-onsemi 0:098463de4c5d 65 memset( ctx, 0, sizeof( mbedtls_ccm_context ) );
group-onsemi 0:098463de4c5d 66 }
group-onsemi 0:098463de4c5d 67
group-onsemi 0:098463de4c5d 68 int mbedtls_ccm_setkey( mbedtls_ccm_context *ctx,
group-onsemi 0:098463de4c5d 69 mbedtls_cipher_id_t cipher,
group-onsemi 0:098463de4c5d 70 const unsigned char *key,
group-onsemi 0:098463de4c5d 71 unsigned int keybits )
group-onsemi 0:098463de4c5d 72 {
group-onsemi 0:098463de4c5d 73 int ret;
group-onsemi 0:098463de4c5d 74 const mbedtls_cipher_info_t *cipher_info;
group-onsemi 0:098463de4c5d 75
group-onsemi 0:098463de4c5d 76 cipher_info = mbedtls_cipher_info_from_values( cipher, keybits, MBEDTLS_MODE_ECB );
group-onsemi 0:098463de4c5d 77 if( cipher_info == NULL )
group-onsemi 0:098463de4c5d 78 return( MBEDTLS_ERR_CCM_BAD_INPUT );
group-onsemi 0:098463de4c5d 79
group-onsemi 0:098463de4c5d 80 if( cipher_info->block_size != 16 )
group-onsemi 0:098463de4c5d 81 return( MBEDTLS_ERR_CCM_BAD_INPUT );
group-onsemi 0:098463de4c5d 82
group-onsemi 0:098463de4c5d 83 mbedtls_cipher_free( &ctx->cipher_ctx );
group-onsemi 0:098463de4c5d 84
group-onsemi 0:098463de4c5d 85 if( ( ret = mbedtls_cipher_setup( &ctx->cipher_ctx, cipher_info ) ) != 0 )
group-onsemi 0:098463de4c5d 86 return( ret );
group-onsemi 0:098463de4c5d 87
group-onsemi 0:098463de4c5d 88 if( ( ret = mbedtls_cipher_setkey( &ctx->cipher_ctx, key, keybits,
group-onsemi 0:098463de4c5d 89 MBEDTLS_ENCRYPT ) ) != 0 )
group-onsemi 0:098463de4c5d 90 {
group-onsemi 0:098463de4c5d 91 return( ret );
group-onsemi 0:098463de4c5d 92 }
group-onsemi 0:098463de4c5d 93
group-onsemi 0:098463de4c5d 94 return( 0 );
group-onsemi 0:098463de4c5d 95 }
group-onsemi 0:098463de4c5d 96
group-onsemi 0:098463de4c5d 97 /*
group-onsemi 0:098463de4c5d 98 * Free context
group-onsemi 0:098463de4c5d 99 */
group-onsemi 0:098463de4c5d 100 void mbedtls_ccm_free( mbedtls_ccm_context *ctx )
group-onsemi 0:098463de4c5d 101 {
group-onsemi 0:098463de4c5d 102 mbedtls_cipher_free( &ctx->cipher_ctx );
group-onsemi 0:098463de4c5d 103 mbedtls_zeroize( ctx, sizeof( mbedtls_ccm_context ) );
group-onsemi 0:098463de4c5d 104 }
group-onsemi 0:098463de4c5d 105
group-onsemi 0:098463de4c5d 106 /*
group-onsemi 0:098463de4c5d 107 * Macros for common operations.
group-onsemi 0:098463de4c5d 108 * Results in smaller compiled code than static inline functions.
group-onsemi 0:098463de4c5d 109 */
group-onsemi 0:098463de4c5d 110
group-onsemi 0:098463de4c5d 111 /*
group-onsemi 0:098463de4c5d 112 * Update the CBC-MAC state in y using a block in b
group-onsemi 0:098463de4c5d 113 * (Always using b as the source helps the compiler optimise a bit better.)
group-onsemi 0:098463de4c5d 114 */
group-onsemi 0:098463de4c5d 115 #define UPDATE_CBC_MAC \
group-onsemi 0:098463de4c5d 116 for( i = 0; i < 16; i++ ) \
group-onsemi 0:098463de4c5d 117 y[i] ^= b[i]; \
group-onsemi 0:098463de4c5d 118 \
group-onsemi 0:098463de4c5d 119 if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, y, 16, y, &olen ) ) != 0 ) \
group-onsemi 0:098463de4c5d 120 return( ret );
group-onsemi 0:098463de4c5d 121
group-onsemi 0:098463de4c5d 122 /*
group-onsemi 0:098463de4c5d 123 * Encrypt or decrypt a partial block with CTR
group-onsemi 0:098463de4c5d 124 * Warning: using b for temporary storage! src and dst must not be b!
group-onsemi 0:098463de4c5d 125 * This avoids allocating one more 16 bytes buffer while allowing src == dst.
group-onsemi 0:098463de4c5d 126 */
group-onsemi 0:098463de4c5d 127 #define CTR_CRYPT( dst, src, len ) \
group-onsemi 0:098463de4c5d 128 if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, ctr, 16, b, &olen ) ) != 0 ) \
group-onsemi 0:098463de4c5d 129 return( ret ); \
group-onsemi 0:098463de4c5d 130 \
group-onsemi 0:098463de4c5d 131 for( i = 0; i < len; i++ ) \
group-onsemi 0:098463de4c5d 132 dst[i] = src[i] ^ b[i];
group-onsemi 0:098463de4c5d 133
group-onsemi 0:098463de4c5d 134 /*
group-onsemi 0:098463de4c5d 135 * Authenticated encryption or decryption
group-onsemi 0:098463de4c5d 136 */
group-onsemi 0:098463de4c5d 137 static int ccm_auth_crypt( mbedtls_ccm_context *ctx, int mode, size_t length,
group-onsemi 0:098463de4c5d 138 const unsigned char *iv, size_t iv_len,
group-onsemi 0:098463de4c5d 139 const unsigned char *add, size_t add_len,
group-onsemi 0:098463de4c5d 140 const unsigned char *input, unsigned char *output,
group-onsemi 0:098463de4c5d 141 unsigned char *tag, size_t tag_len )
group-onsemi 0:098463de4c5d 142 {
group-onsemi 0:098463de4c5d 143 int ret;
group-onsemi 0:098463de4c5d 144 unsigned char i;
group-onsemi 0:098463de4c5d 145 unsigned char q;
group-onsemi 0:098463de4c5d 146 size_t len_left, olen;
group-onsemi 0:098463de4c5d 147 unsigned char b[16];
group-onsemi 0:098463de4c5d 148 unsigned char y[16];
group-onsemi 0:098463de4c5d 149 unsigned char ctr[16];
group-onsemi 0:098463de4c5d 150 const unsigned char *src;
group-onsemi 0:098463de4c5d 151 unsigned char *dst;
group-onsemi 0:098463de4c5d 152
group-onsemi 0:098463de4c5d 153 /*
group-onsemi 0:098463de4c5d 154 * Check length requirements: SP800-38C A.1
group-onsemi 0:098463de4c5d 155 * Additional requirement: a < 2^16 - 2^8 to simplify the code.
group-onsemi 0:098463de4c5d 156 * 'length' checked later (when writing it to the first block)
group-onsemi 0:098463de4c5d 157 */
group-onsemi 0:098463de4c5d 158 if( tag_len < 4 || tag_len > 16 || tag_len % 2 != 0 )
group-onsemi 0:098463de4c5d 159 return( MBEDTLS_ERR_CCM_BAD_INPUT );
group-onsemi 0:098463de4c5d 160
group-onsemi 0:098463de4c5d 161 /* Also implies q is within bounds */
group-onsemi 0:098463de4c5d 162 if( iv_len < 7 || iv_len > 13 )
group-onsemi 0:098463de4c5d 163 return( MBEDTLS_ERR_CCM_BAD_INPUT );
group-onsemi 0:098463de4c5d 164
group-onsemi 0:098463de4c5d 165 if( add_len > 0xFF00 )
group-onsemi 0:098463de4c5d 166 return( MBEDTLS_ERR_CCM_BAD_INPUT );
group-onsemi 0:098463de4c5d 167
group-onsemi 0:098463de4c5d 168 q = 16 - 1 - (unsigned char) iv_len;
group-onsemi 0:098463de4c5d 169
group-onsemi 0:098463de4c5d 170 /*
group-onsemi 0:098463de4c5d 171 * First block B_0:
group-onsemi 0:098463de4c5d 172 * 0 .. 0 flags
group-onsemi 0:098463de4c5d 173 * 1 .. iv_len nonce (aka iv)
group-onsemi 0:098463de4c5d 174 * iv_len+1 .. 15 length
group-onsemi 0:098463de4c5d 175 *
group-onsemi 0:098463de4c5d 176 * With flags as (bits):
group-onsemi 0:098463de4c5d 177 * 7 0
group-onsemi 0:098463de4c5d 178 * 6 add present?
group-onsemi 0:098463de4c5d 179 * 5 .. 3 (t - 2) / 2
group-onsemi 0:098463de4c5d 180 * 2 .. 0 q - 1
group-onsemi 0:098463de4c5d 181 */
group-onsemi 0:098463de4c5d 182 b[0] = 0;
group-onsemi 0:098463de4c5d 183 b[0] |= ( add_len > 0 ) << 6;
group-onsemi 0:098463de4c5d 184 b[0] |= ( ( tag_len - 2 ) / 2 ) << 3;
group-onsemi 0:098463de4c5d 185 b[0] |= q - 1;
group-onsemi 0:098463de4c5d 186
group-onsemi 0:098463de4c5d 187 memcpy( b + 1, iv, iv_len );
group-onsemi 0:098463de4c5d 188
group-onsemi 0:098463de4c5d 189 for( i = 0, len_left = length; i < q; i++, len_left >>= 8 )
group-onsemi 0:098463de4c5d 190 b[15-i] = (unsigned char)( len_left & 0xFF );
group-onsemi 0:098463de4c5d 191
group-onsemi 0:098463de4c5d 192 if( len_left > 0 )
group-onsemi 0:098463de4c5d 193 return( MBEDTLS_ERR_CCM_BAD_INPUT );
group-onsemi 0:098463de4c5d 194
group-onsemi 0:098463de4c5d 195
group-onsemi 0:098463de4c5d 196 /* Start CBC-MAC with first block */
group-onsemi 0:098463de4c5d 197 memset( y, 0, 16 );
group-onsemi 0:098463de4c5d 198 UPDATE_CBC_MAC;
group-onsemi 0:098463de4c5d 199
group-onsemi 0:098463de4c5d 200 /*
group-onsemi 0:098463de4c5d 201 * If there is additional data, update CBC-MAC with
group-onsemi 0:098463de4c5d 202 * add_len, add, 0 (padding to a block boundary)
group-onsemi 0:098463de4c5d 203 */
group-onsemi 0:098463de4c5d 204 if( add_len > 0 )
group-onsemi 0:098463de4c5d 205 {
group-onsemi 0:098463de4c5d 206 size_t use_len;
group-onsemi 0:098463de4c5d 207 len_left = add_len;
group-onsemi 0:098463de4c5d 208 src = add;
group-onsemi 0:098463de4c5d 209
group-onsemi 0:098463de4c5d 210 memset( b, 0, 16 );
group-onsemi 0:098463de4c5d 211 b[0] = (unsigned char)( ( add_len >> 8 ) & 0xFF );
group-onsemi 0:098463de4c5d 212 b[1] = (unsigned char)( ( add_len ) & 0xFF );
group-onsemi 0:098463de4c5d 213
group-onsemi 0:098463de4c5d 214 use_len = len_left < 16 - 2 ? len_left : 16 - 2;
group-onsemi 0:098463de4c5d 215 memcpy( b + 2, src, use_len );
group-onsemi 0:098463de4c5d 216 len_left -= use_len;
group-onsemi 0:098463de4c5d 217 src += use_len;
group-onsemi 0:098463de4c5d 218
group-onsemi 0:098463de4c5d 219 UPDATE_CBC_MAC;
group-onsemi 0:098463de4c5d 220
group-onsemi 0:098463de4c5d 221 while( len_left > 0 )
group-onsemi 0:098463de4c5d 222 {
group-onsemi 0:098463de4c5d 223 use_len = len_left > 16 ? 16 : len_left;
group-onsemi 0:098463de4c5d 224
group-onsemi 0:098463de4c5d 225 memset( b, 0, 16 );
group-onsemi 0:098463de4c5d 226 memcpy( b, src, use_len );
group-onsemi 0:098463de4c5d 227 UPDATE_CBC_MAC;
group-onsemi 0:098463de4c5d 228
group-onsemi 0:098463de4c5d 229 len_left -= use_len;
group-onsemi 0:098463de4c5d 230 src += use_len;
group-onsemi 0:098463de4c5d 231 }
group-onsemi 0:098463de4c5d 232 }
group-onsemi 0:098463de4c5d 233
group-onsemi 0:098463de4c5d 234 /*
group-onsemi 0:098463de4c5d 235 * Prepare counter block for encryption:
group-onsemi 0:098463de4c5d 236 * 0 .. 0 flags
group-onsemi 0:098463de4c5d 237 * 1 .. iv_len nonce (aka iv)
group-onsemi 0:098463de4c5d 238 * iv_len+1 .. 15 counter (initially 1)
group-onsemi 0:098463de4c5d 239 *
group-onsemi 0:098463de4c5d 240 * With flags as (bits):
group-onsemi 0:098463de4c5d 241 * 7 .. 3 0
group-onsemi 0:098463de4c5d 242 * 2 .. 0 q - 1
group-onsemi 0:098463de4c5d 243 */
group-onsemi 0:098463de4c5d 244 ctr[0] = q - 1;
group-onsemi 0:098463de4c5d 245 memcpy( ctr + 1, iv, iv_len );
group-onsemi 0:098463de4c5d 246 memset( ctr + 1 + iv_len, 0, q );
group-onsemi 0:098463de4c5d 247 ctr[15] = 1;
group-onsemi 0:098463de4c5d 248
group-onsemi 0:098463de4c5d 249 /*
group-onsemi 0:098463de4c5d 250 * Authenticate and {en,de}crypt the message.
group-onsemi 0:098463de4c5d 251 *
group-onsemi 0:098463de4c5d 252 * The only difference between encryption and decryption is
group-onsemi 0:098463de4c5d 253 * the respective order of authentication and {en,de}cryption.
group-onsemi 0:098463de4c5d 254 */
group-onsemi 0:098463de4c5d 255 len_left = length;
group-onsemi 0:098463de4c5d 256 src = input;
group-onsemi 0:098463de4c5d 257 dst = output;
group-onsemi 0:098463de4c5d 258
group-onsemi 0:098463de4c5d 259 while( len_left > 0 )
group-onsemi 0:098463de4c5d 260 {
group-onsemi 0:098463de4c5d 261 size_t use_len = len_left > 16 ? 16 : len_left;
group-onsemi 0:098463de4c5d 262
group-onsemi 0:098463de4c5d 263 if( mode == CCM_ENCRYPT )
group-onsemi 0:098463de4c5d 264 {
group-onsemi 0:098463de4c5d 265 memset( b, 0, 16 );
group-onsemi 0:098463de4c5d 266 memcpy( b, src, use_len );
group-onsemi 0:098463de4c5d 267 UPDATE_CBC_MAC;
group-onsemi 0:098463de4c5d 268 }
group-onsemi 0:098463de4c5d 269
group-onsemi 0:098463de4c5d 270 CTR_CRYPT( dst, src, use_len );
group-onsemi 0:098463de4c5d 271
group-onsemi 0:098463de4c5d 272 if( mode == CCM_DECRYPT )
group-onsemi 0:098463de4c5d 273 {
group-onsemi 0:098463de4c5d 274 memset( b, 0, 16 );
group-onsemi 0:098463de4c5d 275 memcpy( b, dst, use_len );
group-onsemi 0:098463de4c5d 276 UPDATE_CBC_MAC;
group-onsemi 0:098463de4c5d 277 }
group-onsemi 0:098463de4c5d 278
group-onsemi 0:098463de4c5d 279 dst += use_len;
group-onsemi 0:098463de4c5d 280 src += use_len;
group-onsemi 0:098463de4c5d 281 len_left -= use_len;
group-onsemi 0:098463de4c5d 282
group-onsemi 0:098463de4c5d 283 /*
group-onsemi 0:098463de4c5d 284 * Increment counter.
group-onsemi 0:098463de4c5d 285 * No need to check for overflow thanks to the length check above.
group-onsemi 0:098463de4c5d 286 */
group-onsemi 0:098463de4c5d 287 for( i = 0; i < q; i++ )
group-onsemi 0:098463de4c5d 288 if( ++ctr[15-i] != 0 )
group-onsemi 0:098463de4c5d 289 break;
group-onsemi 0:098463de4c5d 290 }
group-onsemi 0:098463de4c5d 291
group-onsemi 0:098463de4c5d 292 /*
group-onsemi 0:098463de4c5d 293 * Authentication: reset counter and crypt/mask internal tag
group-onsemi 0:098463de4c5d 294 */
group-onsemi 0:098463de4c5d 295 for( i = 0; i < q; i++ )
group-onsemi 0:098463de4c5d 296 ctr[15-i] = 0;
group-onsemi 0:098463de4c5d 297
group-onsemi 0:098463de4c5d 298 CTR_CRYPT( y, y, 16 );
group-onsemi 0:098463de4c5d 299 memcpy( tag, y, tag_len );
group-onsemi 0:098463de4c5d 300
group-onsemi 0:098463de4c5d 301 return( 0 );
group-onsemi 0:098463de4c5d 302 }
group-onsemi 0:098463de4c5d 303
group-onsemi 0:098463de4c5d 304 /*
group-onsemi 0:098463de4c5d 305 * Authenticated encryption
group-onsemi 0:098463de4c5d 306 */
group-onsemi 0:098463de4c5d 307 int mbedtls_ccm_encrypt_and_tag( mbedtls_ccm_context *ctx, size_t length,
group-onsemi 0:098463de4c5d 308 const unsigned char *iv, size_t iv_len,
group-onsemi 0:098463de4c5d 309 const unsigned char *add, size_t add_len,
group-onsemi 0:098463de4c5d 310 const unsigned char *input, unsigned char *output,
group-onsemi 0:098463de4c5d 311 unsigned char *tag, size_t tag_len )
group-onsemi 0:098463de4c5d 312 {
group-onsemi 0:098463de4c5d 313 return( ccm_auth_crypt( ctx, CCM_ENCRYPT, length, iv, iv_len,
group-onsemi 0:098463de4c5d 314 add, add_len, input, output, tag, tag_len ) );
group-onsemi 0:098463de4c5d 315 }
group-onsemi 0:098463de4c5d 316
group-onsemi 0:098463de4c5d 317 /*
group-onsemi 0:098463de4c5d 318 * Authenticated decryption
group-onsemi 0:098463de4c5d 319 */
group-onsemi 0:098463de4c5d 320 int mbedtls_ccm_auth_decrypt( mbedtls_ccm_context *ctx, size_t length,
group-onsemi 0:098463de4c5d 321 const unsigned char *iv, size_t iv_len,
group-onsemi 0:098463de4c5d 322 const unsigned char *add, size_t add_len,
group-onsemi 0:098463de4c5d 323 const unsigned char *input, unsigned char *output,
group-onsemi 0:098463de4c5d 324 const unsigned char *tag, size_t tag_len )
group-onsemi 0:098463de4c5d 325 {
group-onsemi 0:098463de4c5d 326 int ret;
group-onsemi 0:098463de4c5d 327 unsigned char check_tag[16];
group-onsemi 0:098463de4c5d 328 unsigned char i;
group-onsemi 0:098463de4c5d 329 int diff;
group-onsemi 0:098463de4c5d 330
group-onsemi 0:098463de4c5d 331 if( ( ret = ccm_auth_crypt( ctx, CCM_DECRYPT, length,
group-onsemi 0:098463de4c5d 332 iv, iv_len, add, add_len,
group-onsemi 0:098463de4c5d 333 input, output, check_tag, tag_len ) ) != 0 )
group-onsemi 0:098463de4c5d 334 {
group-onsemi 0:098463de4c5d 335 return( ret );
group-onsemi 0:098463de4c5d 336 }
group-onsemi 0:098463de4c5d 337
group-onsemi 0:098463de4c5d 338 /* Check tag in "constant-time" */
group-onsemi 0:098463de4c5d 339 for( diff = 0, i = 0; i < tag_len; i++ )
group-onsemi 0:098463de4c5d 340 diff |= tag[i] ^ check_tag[i];
group-onsemi 0:098463de4c5d 341
group-onsemi 0:098463de4c5d 342 if( diff != 0 )
group-onsemi 0:098463de4c5d 343 {
group-onsemi 0:098463de4c5d 344 mbedtls_zeroize( output, length );
group-onsemi 0:098463de4c5d 345 return( MBEDTLS_ERR_CCM_AUTH_FAILED );
group-onsemi 0:098463de4c5d 346 }
group-onsemi 0:098463de4c5d 347
group-onsemi 0:098463de4c5d 348 return( 0 );
group-onsemi 0:098463de4c5d 349 }
group-onsemi 0:098463de4c5d 350
group-onsemi 0:098463de4c5d 351
group-onsemi 0:098463de4c5d 352 #if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
group-onsemi 0:098463de4c5d 353 /*
group-onsemi 0:098463de4c5d 354 * Examples 1 to 3 from SP800-38C Appendix C
group-onsemi 0:098463de4c5d 355 */
group-onsemi 0:098463de4c5d 356
group-onsemi 0:098463de4c5d 357 #define NB_TESTS 3
group-onsemi 0:098463de4c5d 358
group-onsemi 0:098463de4c5d 359 /*
group-onsemi 0:098463de4c5d 360 * The data is the same for all tests, only the used length changes
group-onsemi 0:098463de4c5d 361 */
group-onsemi 0:098463de4c5d 362 static const unsigned char key[] = {
group-onsemi 0:098463de4c5d 363 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
group-onsemi 0:098463de4c5d 364 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f
group-onsemi 0:098463de4c5d 365 };
group-onsemi 0:098463de4c5d 366
group-onsemi 0:098463de4c5d 367 static const unsigned char iv[] = {
group-onsemi 0:098463de4c5d 368 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
group-onsemi 0:098463de4c5d 369 0x18, 0x19, 0x1a, 0x1b
group-onsemi 0:098463de4c5d 370 };
group-onsemi 0:098463de4c5d 371
group-onsemi 0:098463de4c5d 372 static const unsigned char ad[] = {
group-onsemi 0:098463de4c5d 373 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
group-onsemi 0:098463de4c5d 374 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
group-onsemi 0:098463de4c5d 375 0x10, 0x11, 0x12, 0x13
group-onsemi 0:098463de4c5d 376 };
group-onsemi 0:098463de4c5d 377
group-onsemi 0:098463de4c5d 378 static const unsigned char msg[] = {
group-onsemi 0:098463de4c5d 379 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
group-onsemi 0:098463de4c5d 380 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
group-onsemi 0:098463de4c5d 381 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
group-onsemi 0:098463de4c5d 382 };
group-onsemi 0:098463de4c5d 383
group-onsemi 0:098463de4c5d 384 static const size_t iv_len [NB_TESTS] = { 7, 8, 12 };
group-onsemi 0:098463de4c5d 385 static const size_t add_len[NB_TESTS] = { 8, 16, 20 };
group-onsemi 0:098463de4c5d 386 static const size_t msg_len[NB_TESTS] = { 4, 16, 24 };
group-onsemi 0:098463de4c5d 387 static const size_t tag_len[NB_TESTS] = { 4, 6, 8 };
group-onsemi 0:098463de4c5d 388
group-onsemi 0:098463de4c5d 389 static const unsigned char res[NB_TESTS][32] = {
group-onsemi 0:098463de4c5d 390 { 0x71, 0x62, 0x01, 0x5b, 0x4d, 0xac, 0x25, 0x5d },
group-onsemi 0:098463de4c5d 391 { 0xd2, 0xa1, 0xf0, 0xe0, 0x51, 0xea, 0x5f, 0x62,
group-onsemi 0:098463de4c5d 392 0x08, 0x1a, 0x77, 0x92, 0x07, 0x3d, 0x59, 0x3d,
group-onsemi 0:098463de4c5d 393 0x1f, 0xc6, 0x4f, 0xbf, 0xac, 0xcd },
group-onsemi 0:098463de4c5d 394 { 0xe3, 0xb2, 0x01, 0xa9, 0xf5, 0xb7, 0x1a, 0x7a,
group-onsemi 0:098463de4c5d 395 0x9b, 0x1c, 0xea, 0xec, 0xcd, 0x97, 0xe7, 0x0b,
group-onsemi 0:098463de4c5d 396 0x61, 0x76, 0xaa, 0xd9, 0xa4, 0x42, 0x8a, 0xa5,
group-onsemi 0:098463de4c5d 397 0x48, 0x43, 0x92, 0xfb, 0xc1, 0xb0, 0x99, 0x51 }
group-onsemi 0:098463de4c5d 398 };
group-onsemi 0:098463de4c5d 399
group-onsemi 0:098463de4c5d 400 int mbedtls_ccm_self_test( int verbose )
group-onsemi 0:098463de4c5d 401 {
group-onsemi 0:098463de4c5d 402 mbedtls_ccm_context ctx;
group-onsemi 0:098463de4c5d 403 unsigned char out[32];
group-onsemi 0:098463de4c5d 404 size_t i;
group-onsemi 0:098463de4c5d 405 int ret;
group-onsemi 0:098463de4c5d 406
group-onsemi 0:098463de4c5d 407 mbedtls_ccm_init( &ctx );
group-onsemi 0:098463de4c5d 408
group-onsemi 0:098463de4c5d 409 if( mbedtls_ccm_setkey( &ctx, MBEDTLS_CIPHER_ID_AES, key, 8 * sizeof key ) != 0 )
group-onsemi 0:098463de4c5d 410 {
group-onsemi 0:098463de4c5d 411 if( verbose != 0 )
group-onsemi 0:098463de4c5d 412 mbedtls_printf( " CCM: setup failed" );
group-onsemi 0:098463de4c5d 413
group-onsemi 0:098463de4c5d 414 return( 1 );
group-onsemi 0:098463de4c5d 415 }
group-onsemi 0:098463de4c5d 416
group-onsemi 0:098463de4c5d 417 for( i = 0; i < NB_TESTS; i++ )
group-onsemi 0:098463de4c5d 418 {
group-onsemi 0:098463de4c5d 419 if( verbose != 0 )
group-onsemi 0:098463de4c5d 420 mbedtls_printf( " CCM-AES #%u: ", (unsigned int) i + 1 );
group-onsemi 0:098463de4c5d 421
group-onsemi 0:098463de4c5d 422 ret = mbedtls_ccm_encrypt_and_tag( &ctx, msg_len[i],
group-onsemi 0:098463de4c5d 423 iv, iv_len[i], ad, add_len[i],
group-onsemi 0:098463de4c5d 424 msg, out,
group-onsemi 0:098463de4c5d 425 out + msg_len[i], tag_len[i] );
group-onsemi 0:098463de4c5d 426
group-onsemi 0:098463de4c5d 427 if( ret != 0 ||
group-onsemi 0:098463de4c5d 428 memcmp( out, res[i], msg_len[i] + tag_len[i] ) != 0 )
group-onsemi 0:098463de4c5d 429 {
group-onsemi 0:098463de4c5d 430 if( verbose != 0 )
group-onsemi 0:098463de4c5d 431 mbedtls_printf( "failed\n" );
group-onsemi 0:098463de4c5d 432
group-onsemi 0:098463de4c5d 433 return( 1 );
group-onsemi 0:098463de4c5d 434 }
group-onsemi 0:098463de4c5d 435
group-onsemi 0:098463de4c5d 436 ret = mbedtls_ccm_auth_decrypt( &ctx, msg_len[i],
group-onsemi 0:098463de4c5d 437 iv, iv_len[i], ad, add_len[i],
group-onsemi 0:098463de4c5d 438 res[i], out,
group-onsemi 0:098463de4c5d 439 res[i] + msg_len[i], tag_len[i] );
group-onsemi 0:098463de4c5d 440
group-onsemi 0:098463de4c5d 441 if( ret != 0 ||
group-onsemi 0:098463de4c5d 442 memcmp( out, msg, msg_len[i] ) != 0 )
group-onsemi 0:098463de4c5d 443 {
group-onsemi 0:098463de4c5d 444 if( verbose != 0 )
group-onsemi 0:098463de4c5d 445 mbedtls_printf( "failed\n" );
group-onsemi 0:098463de4c5d 446
group-onsemi 0:098463de4c5d 447 return( 1 );
group-onsemi 0:098463de4c5d 448 }
group-onsemi 0:098463de4c5d 449
group-onsemi 0:098463de4c5d 450 if( verbose != 0 )
group-onsemi 0:098463de4c5d 451 mbedtls_printf( "passed\n" );
group-onsemi 0:098463de4c5d 452 }
group-onsemi 0:098463de4c5d 453
group-onsemi 0:098463de4c5d 454 mbedtls_ccm_free( &ctx );
group-onsemi 0:098463de4c5d 455
group-onsemi 0:098463de4c5d 456 if( verbose != 0 )
group-onsemi 0:098463de4c5d 457 mbedtls_printf( "\n" );
group-onsemi 0:098463de4c5d 458
group-onsemi 0:098463de4c5d 459 return( 0 );
group-onsemi 0:098463de4c5d 460 }
group-onsemi 0:098463de4c5d 461
group-onsemi 0:098463de4c5d 462 #endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
group-onsemi 0:098463de4c5d 463
group-onsemi 0:098463de4c5d 464 #endif /* MBEDTLS_CCM_C */