Mark Radbourne / mbedtls

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Dependents:   Encrypt_Decrypt1 mbed_blink_tls encrypt encrypt

library/ccm.c@0:cdf462088d13, 2017-01-05 (annotated)

Committer:
markrad
Date:
Thu Jan 05 00:18:44 2017 +0000
Revision:
0:cdf462088d13
Initial commit

Who changed what in which revision?

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markrad 0:cdf462088d13 1 /*
markrad 0:cdf462088d13 2 * NIST SP800-38C compliant CCM implementation
markrad 0:cdf462088d13 3 *
markrad 0:cdf462088d13 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
markrad 0:cdf462088d13 5 * SPDX-License-Identifier: Apache-2.0
markrad 0:cdf462088d13 6 *
markrad 0:cdf462088d13 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
markrad 0:cdf462088d13 8 * not use this file except in compliance with the License.
markrad 0:cdf462088d13 9 * You may obtain a copy of the License at
markrad 0:cdf462088d13 10 *
markrad 0:cdf462088d13 11 * http://www.apache.org/licenses/LICENSE-2.0
markrad 0:cdf462088d13 12 *
markrad 0:cdf462088d13 13 * Unless required by applicable law or agreed to in writing, software
markrad 0:cdf462088d13 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
markrad 0:cdf462088d13 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
markrad 0:cdf462088d13 16 * See the License for the specific language governing permissions and
markrad 0:cdf462088d13 17 * limitations under the License.
markrad 0:cdf462088d13 18 *
markrad 0:cdf462088d13 19 * This file is part of mbed TLS (https://tls.mbed.org)
markrad 0:cdf462088d13 20 */
markrad 0:cdf462088d13 21
markrad 0:cdf462088d13 22 /*
markrad 0:cdf462088d13 23 * Definition of CCM:
markrad 0:cdf462088d13 24 * http://csrc.nist.gov/publications/nistpubs/800-38C/SP800-38C_updated-July20_2007.pdf
markrad 0:cdf462088d13 25 * RFC 3610 "Counter with CBC-MAC (CCM)"
markrad 0:cdf462088d13 26 *
markrad 0:cdf462088d13 27 * Related:
markrad 0:cdf462088d13 28 * RFC 5116 "An Interface and Algorithms for Authenticated Encryption"
markrad 0:cdf462088d13 29 */
markrad 0:cdf462088d13 30
markrad 0:cdf462088d13 31 #if !defined(MBEDTLS_CONFIG_FILE)
markrad 0:cdf462088d13 32 #include "mbedtls/config.h"
markrad 0:cdf462088d13 33 #else
markrad 0:cdf462088d13 34 #include MBEDTLS_CONFIG_FILE
markrad 0:cdf462088d13 35 #endif
markrad 0:cdf462088d13 36
markrad 0:cdf462088d13 37 #if defined(MBEDTLS_CCM_C)
markrad 0:cdf462088d13 38
markrad 0:cdf462088d13 39 #include "mbedtls/ccm.h"
markrad 0:cdf462088d13 40
markrad 0:cdf462088d13 41 #include <string.h>
markrad 0:cdf462088d13 42
markrad 0:cdf462088d13 43 #if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
markrad 0:cdf462088d13 44 #if defined(MBEDTLS_PLATFORM_C)
markrad 0:cdf462088d13 45 #include "mbedtls/platform.h"
markrad 0:cdf462088d13 46 #else
markrad 0:cdf462088d13 47 #include <stdio.h>
markrad 0:cdf462088d13 48 #define mbedtls_printf printf
markrad 0:cdf462088d13 49 #endif /* MBEDTLS_PLATFORM_C */
markrad 0:cdf462088d13 50 #endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
markrad 0:cdf462088d13 51
markrad 0:cdf462088d13 52 /* Implementation that should never be optimized out by the compiler */
markrad 0:cdf462088d13 53 static void mbedtls_zeroize( void *v, size_t n ) {
markrad 0:cdf462088d13 54 volatile unsigned char *p = (unsigned char*)v; while( n-- ) *p++ = 0;
markrad 0:cdf462088d13 55 }
markrad 0:cdf462088d13 56
markrad 0:cdf462088d13 57 #define CCM_ENCRYPT 0
markrad 0:cdf462088d13 58 #define CCM_DECRYPT 1
markrad 0:cdf462088d13 59
markrad 0:cdf462088d13 60 /*
markrad 0:cdf462088d13 61 * Initialize context
markrad 0:cdf462088d13 62 */
markrad 0:cdf462088d13 63 void mbedtls_ccm_init( mbedtls_ccm_context *ctx )
markrad 0:cdf462088d13 64 {
markrad 0:cdf462088d13 65 memset( ctx, 0, sizeof( mbedtls_ccm_context ) );
markrad 0:cdf462088d13 66 }
markrad 0:cdf462088d13 67
markrad 0:cdf462088d13 68 int mbedtls_ccm_setkey( mbedtls_ccm_context *ctx,
markrad 0:cdf462088d13 69 mbedtls_cipher_id_t cipher,
markrad 0:cdf462088d13 70 const unsigned char *key,
markrad 0:cdf462088d13 71 unsigned int keybits )
markrad 0:cdf462088d13 72 {
markrad 0:cdf462088d13 73 int ret;
markrad 0:cdf462088d13 74 const mbedtls_cipher_info_t *cipher_info;
markrad 0:cdf462088d13 75
markrad 0:cdf462088d13 76 cipher_info = mbedtls_cipher_info_from_values( cipher, keybits, MBEDTLS_MODE_ECB );
markrad 0:cdf462088d13 77 if( cipher_info == NULL )
markrad 0:cdf462088d13 78 return( MBEDTLS_ERR_CCM_BAD_INPUT );
markrad 0:cdf462088d13 79
markrad 0:cdf462088d13 80 if( cipher_info->block_size != 16 )
markrad 0:cdf462088d13 81 return( MBEDTLS_ERR_CCM_BAD_INPUT );
markrad 0:cdf462088d13 82
markrad 0:cdf462088d13 83 mbedtls_cipher_free( &ctx->cipher_ctx );
markrad 0:cdf462088d13 84
markrad 0:cdf462088d13 85 if( ( ret = mbedtls_cipher_setup( &ctx->cipher_ctx, cipher_info ) ) != 0 )
markrad 0:cdf462088d13 86 return( ret );
markrad 0:cdf462088d13 87
markrad 0:cdf462088d13 88 if( ( ret = mbedtls_cipher_setkey( &ctx->cipher_ctx, key, keybits,
markrad 0:cdf462088d13 89 MBEDTLS_ENCRYPT ) ) != 0 )
markrad 0:cdf462088d13 90 {
markrad 0:cdf462088d13 91 return( ret );
markrad 0:cdf462088d13 92 }
markrad 0:cdf462088d13 93
markrad 0:cdf462088d13 94 return( 0 );
markrad 0:cdf462088d13 95 }
markrad 0:cdf462088d13 96
markrad 0:cdf462088d13 97 /*
markrad 0:cdf462088d13 98 * Free context
markrad 0:cdf462088d13 99 */
markrad 0:cdf462088d13 100 void mbedtls_ccm_free( mbedtls_ccm_context *ctx )
markrad 0:cdf462088d13 101 {
markrad 0:cdf462088d13 102 mbedtls_cipher_free( &ctx->cipher_ctx );
markrad 0:cdf462088d13 103 mbedtls_zeroize( ctx, sizeof( mbedtls_ccm_context ) );
markrad 0:cdf462088d13 104 }
markrad 0:cdf462088d13 105
markrad 0:cdf462088d13 106 /*
markrad 0:cdf462088d13 107 * Macros for common operations.
markrad 0:cdf462088d13 108 * Results in smaller compiled code than static inline functions.
markrad 0:cdf462088d13 109 */
markrad 0:cdf462088d13 110
markrad 0:cdf462088d13 111 /*
markrad 0:cdf462088d13 112 * Update the CBC-MAC state in y using a block in b
markrad 0:cdf462088d13 113 * (Always using b as the source helps the compiler optimise a bit better.)
markrad 0:cdf462088d13 114 */
markrad 0:cdf462088d13 115 #define UPDATE_CBC_MAC \
markrad 0:cdf462088d13 116 for( i = 0; i < 16; i++ ) \
markrad 0:cdf462088d13 117 y[i] ^= b[i]; \
markrad 0:cdf462088d13 118 \
markrad 0:cdf462088d13 119 if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, y, 16, y, &olen ) ) != 0 ) \
markrad 0:cdf462088d13 120 return( ret );
markrad 0:cdf462088d13 121
markrad 0:cdf462088d13 122 /*
markrad 0:cdf462088d13 123 * Encrypt or decrypt a partial block with CTR
markrad 0:cdf462088d13 124 * Warning: using b for temporary storage! src and dst must not be b!
markrad 0:cdf462088d13 125 * This avoids allocating one more 16 bytes buffer while allowing src == dst.
markrad 0:cdf462088d13 126 */
markrad 0:cdf462088d13 127 #define CTR_CRYPT( dst, src, len ) \
markrad 0:cdf462088d13 128 if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, ctr, 16, b, &olen ) ) != 0 ) \
markrad 0:cdf462088d13 129 return( ret ); \
markrad 0:cdf462088d13 130 \
markrad 0:cdf462088d13 131 for( i = 0; i < len; i++ ) \
markrad 0:cdf462088d13 132 dst[i] = src[i] ^ b[i];
markrad 0:cdf462088d13 133
markrad 0:cdf462088d13 134 /*
markrad 0:cdf462088d13 135 * Authenticated encryption or decryption
markrad 0:cdf462088d13 136 */
markrad 0:cdf462088d13 137 static int ccm_auth_crypt( mbedtls_ccm_context *ctx, int mode, size_t length,
markrad 0:cdf462088d13 138 const unsigned char *iv, size_t iv_len,
markrad 0:cdf462088d13 139 const unsigned char *add, size_t add_len,
markrad 0:cdf462088d13 140 const unsigned char *input, unsigned char *output,
markrad 0:cdf462088d13 141 unsigned char *tag, size_t tag_len )
markrad 0:cdf462088d13 142 {
markrad 0:cdf462088d13 143 int ret;
markrad 0:cdf462088d13 144 unsigned char i;
markrad 0:cdf462088d13 145 unsigned char q;
markrad 0:cdf462088d13 146 size_t len_left, olen;
markrad 0:cdf462088d13 147 unsigned char b[16];
markrad 0:cdf462088d13 148 unsigned char y[16];
markrad 0:cdf462088d13 149 unsigned char ctr[16];
markrad 0:cdf462088d13 150 const unsigned char *src;
markrad 0:cdf462088d13 151 unsigned char *dst;
markrad 0:cdf462088d13 152
markrad 0:cdf462088d13 153 /*
markrad 0:cdf462088d13 154 * Check length requirements: SP800-38C A.1
markrad 0:cdf462088d13 155 * Additional requirement: a < 2^16 - 2^8 to simplify the code.
markrad 0:cdf462088d13 156 * 'length' checked later (when writing it to the first block)
markrad 0:cdf462088d13 157 */
markrad 0:cdf462088d13 158 if( tag_len < 4 || tag_len > 16 || tag_len % 2 != 0 )
markrad 0:cdf462088d13 159 return( MBEDTLS_ERR_CCM_BAD_INPUT );
markrad 0:cdf462088d13 160
markrad 0:cdf462088d13 161 /* Also implies q is within bounds */
markrad 0:cdf462088d13 162 if( iv_len < 7 || iv_len > 13 )
markrad 0:cdf462088d13 163 return( MBEDTLS_ERR_CCM_BAD_INPUT );
markrad 0:cdf462088d13 164
markrad 0:cdf462088d13 165 if( add_len > 0xFF00 )
markrad 0:cdf462088d13 166 return( MBEDTLS_ERR_CCM_BAD_INPUT );
markrad 0:cdf462088d13 167
markrad 0:cdf462088d13 168 q = 16 - 1 - (unsigned char) iv_len;
markrad 0:cdf462088d13 169
markrad 0:cdf462088d13 170 /*
markrad 0:cdf462088d13 171 * First block B_0:
markrad 0:cdf462088d13 172 * 0 .. 0 flags
markrad 0:cdf462088d13 173 * 1 .. iv_len nonce (aka iv)
markrad 0:cdf462088d13 174 * iv_len+1 .. 15 length
markrad 0:cdf462088d13 175 *
markrad 0:cdf462088d13 176 * With flags as (bits):
markrad 0:cdf462088d13 177 * 7 0
markrad 0:cdf462088d13 178 * 6 add present?
markrad 0:cdf462088d13 179 * 5 .. 3 (t - 2) / 2
markrad 0:cdf462088d13 180 * 2 .. 0 q - 1
markrad 0:cdf462088d13 181 */
markrad 0:cdf462088d13 182 b[0] = 0;
markrad 0:cdf462088d13 183 b[0] |= ( add_len > 0 ) << 6;
markrad 0:cdf462088d13 184 b[0] |= ( ( tag_len - 2 ) / 2 ) << 3;
markrad 0:cdf462088d13 185 b[0] |= q - 1;
markrad 0:cdf462088d13 186
markrad 0:cdf462088d13 187 memcpy( b + 1, iv, iv_len );
markrad 0:cdf462088d13 188
markrad 0:cdf462088d13 189 for( i = 0, len_left = length; i < q; i++, len_left >>= 8 )
markrad 0:cdf462088d13 190 b[15-i] = (unsigned char)( len_left & 0xFF );
markrad 0:cdf462088d13 191
markrad 0:cdf462088d13 192 if( len_left > 0 )
markrad 0:cdf462088d13 193 return( MBEDTLS_ERR_CCM_BAD_INPUT );
markrad 0:cdf462088d13 194
markrad 0:cdf462088d13 195
markrad 0:cdf462088d13 196 /* Start CBC-MAC with first block */
markrad 0:cdf462088d13 197 memset( y, 0, 16 );
markrad 0:cdf462088d13 198 UPDATE_CBC_MAC;
markrad 0:cdf462088d13 199
markrad 0:cdf462088d13 200 /*
markrad 0:cdf462088d13 201 * If there is additional data, update CBC-MAC with
markrad 0:cdf462088d13 202 * add_len, add, 0 (padding to a block boundary)
markrad 0:cdf462088d13 203 */
markrad 0:cdf462088d13 204 if( add_len > 0 )
markrad 0:cdf462088d13 205 {
markrad 0:cdf462088d13 206 size_t use_len;
markrad 0:cdf462088d13 207 len_left = add_len;
markrad 0:cdf462088d13 208 src = add;
markrad 0:cdf462088d13 209
markrad 0:cdf462088d13 210 memset( b, 0, 16 );
markrad 0:cdf462088d13 211 b[0] = (unsigned char)( ( add_len >> 8 ) & 0xFF );
markrad 0:cdf462088d13 212 b[1] = (unsigned char)( ( add_len ) & 0xFF );
markrad 0:cdf462088d13 213
markrad 0:cdf462088d13 214 use_len = len_left < 16 - 2 ? len_left : 16 - 2;
markrad 0:cdf462088d13 215 memcpy( b + 2, src, use_len );
markrad 0:cdf462088d13 216 len_left -= use_len;
markrad 0:cdf462088d13 217 src += use_len;
markrad 0:cdf462088d13 218
markrad 0:cdf462088d13 219 UPDATE_CBC_MAC;
markrad 0:cdf462088d13 220
markrad 0:cdf462088d13 221 while( len_left > 0 )
markrad 0:cdf462088d13 222 {
markrad 0:cdf462088d13 223 use_len = len_left > 16 ? 16 : len_left;
markrad 0:cdf462088d13 224
markrad 0:cdf462088d13 225 memset( b, 0, 16 );
markrad 0:cdf462088d13 226 memcpy( b, src, use_len );
markrad 0:cdf462088d13 227 UPDATE_CBC_MAC;
markrad 0:cdf462088d13 228
markrad 0:cdf462088d13 229 len_left -= use_len;
markrad 0:cdf462088d13 230 src += use_len;
markrad 0:cdf462088d13 231 }
markrad 0:cdf462088d13 232 }
markrad 0:cdf462088d13 233
markrad 0:cdf462088d13 234 /*
markrad 0:cdf462088d13 235 * Prepare counter block for encryption:
markrad 0:cdf462088d13 236 * 0 .. 0 flags
markrad 0:cdf462088d13 237 * 1 .. iv_len nonce (aka iv)
markrad 0:cdf462088d13 238 * iv_len+1 .. 15 counter (initially 1)
markrad 0:cdf462088d13 239 *
markrad 0:cdf462088d13 240 * With flags as (bits):
markrad 0:cdf462088d13 241 * 7 .. 3 0
markrad 0:cdf462088d13 242 * 2 .. 0 q - 1
markrad 0:cdf462088d13 243 */
markrad 0:cdf462088d13 244 ctr[0] = q - 1;
markrad 0:cdf462088d13 245 memcpy( ctr + 1, iv, iv_len );
markrad 0:cdf462088d13 246 memset( ctr + 1 + iv_len, 0, q );
markrad 0:cdf462088d13 247 ctr[15] = 1;
markrad 0:cdf462088d13 248
markrad 0:cdf462088d13 249 /*
markrad 0:cdf462088d13 250 * Authenticate and {en,de}crypt the message.
markrad 0:cdf462088d13 251 *
markrad 0:cdf462088d13 252 * The only difference between encryption and decryption is
markrad 0:cdf462088d13 253 * the respective order of authentication and {en,de}cryption.
markrad 0:cdf462088d13 254 */
markrad 0:cdf462088d13 255 len_left = length;
markrad 0:cdf462088d13 256 src = input;
markrad 0:cdf462088d13 257 dst = output;
markrad 0:cdf462088d13 258
markrad 0:cdf462088d13 259 while( len_left > 0 )
markrad 0:cdf462088d13 260 {
markrad 0:cdf462088d13 261 size_t use_len = len_left > 16 ? 16 : len_left;
markrad 0:cdf462088d13 262
markrad 0:cdf462088d13 263 if( mode == CCM_ENCRYPT )
markrad 0:cdf462088d13 264 {
markrad 0:cdf462088d13 265 memset( b, 0, 16 );
markrad 0:cdf462088d13 266 memcpy( b, src, use_len );
markrad 0:cdf462088d13 267 UPDATE_CBC_MAC;
markrad 0:cdf462088d13 268 }
markrad 0:cdf462088d13 269
markrad 0:cdf462088d13 270 CTR_CRYPT( dst, src, use_len );
markrad 0:cdf462088d13 271
markrad 0:cdf462088d13 272 if( mode == CCM_DECRYPT )
markrad 0:cdf462088d13 273 {
markrad 0:cdf462088d13 274 memset( b, 0, 16 );
markrad 0:cdf462088d13 275 memcpy( b, dst, use_len );
markrad 0:cdf462088d13 276 UPDATE_CBC_MAC;
markrad 0:cdf462088d13 277 }
markrad 0:cdf462088d13 278
markrad 0:cdf462088d13 279 dst += use_len;
markrad 0:cdf462088d13 280 src += use_len;
markrad 0:cdf462088d13 281 len_left -= use_len;
markrad 0:cdf462088d13 282
markrad 0:cdf462088d13 283 /*
markrad 0:cdf462088d13 284 * Increment counter.
markrad 0:cdf462088d13 285 * No need to check for overflow thanks to the length check above.
markrad 0:cdf462088d13 286 */
markrad 0:cdf462088d13 287 for( i = 0; i < q; i++ )
markrad 0:cdf462088d13 288 if( ++ctr[15-i] != 0 )
markrad 0:cdf462088d13 289 break;
markrad 0:cdf462088d13 290 }
markrad 0:cdf462088d13 291
markrad 0:cdf462088d13 292 /*
markrad 0:cdf462088d13 293 * Authentication: reset counter and crypt/mask internal tag
markrad 0:cdf462088d13 294 */
markrad 0:cdf462088d13 295 for( i = 0; i < q; i++ )
markrad 0:cdf462088d13 296 ctr[15-i] = 0;
markrad 0:cdf462088d13 297
markrad 0:cdf462088d13 298 CTR_CRYPT( y, y, 16 );
markrad 0:cdf462088d13 299 memcpy( tag, y, tag_len );
markrad 0:cdf462088d13 300
markrad 0:cdf462088d13 301 return( 0 );
markrad 0:cdf462088d13 302 }
markrad 0:cdf462088d13 303
markrad 0:cdf462088d13 304 /*
markrad 0:cdf462088d13 305 * Authenticated encryption
markrad 0:cdf462088d13 306 */
markrad 0:cdf462088d13 307 int mbedtls_ccm_encrypt_and_tag( mbedtls_ccm_context *ctx, size_t length,
markrad 0:cdf462088d13 308 const unsigned char *iv, size_t iv_len,
markrad 0:cdf462088d13 309 const unsigned char *add, size_t add_len,
markrad 0:cdf462088d13 310 const unsigned char *input, unsigned char *output,
markrad 0:cdf462088d13 311 unsigned char *tag, size_t tag_len )
markrad 0:cdf462088d13 312 {
markrad 0:cdf462088d13 313 return( ccm_auth_crypt( ctx, CCM_ENCRYPT, length, iv, iv_len,
markrad 0:cdf462088d13 314 add, add_len, input, output, tag, tag_len ) );
markrad 0:cdf462088d13 315 }
markrad 0:cdf462088d13 316
markrad 0:cdf462088d13 317 /*
markrad 0:cdf462088d13 318 * Authenticated decryption
markrad 0:cdf462088d13 319 */
markrad 0:cdf462088d13 320 int mbedtls_ccm_auth_decrypt( mbedtls_ccm_context *ctx, size_t length,
markrad 0:cdf462088d13 321 const unsigned char *iv, size_t iv_len,
markrad 0:cdf462088d13 322 const unsigned char *add, size_t add_len,
markrad 0:cdf462088d13 323 const unsigned char *input, unsigned char *output,
markrad 0:cdf462088d13 324 const unsigned char *tag, size_t tag_len )
markrad 0:cdf462088d13 325 {
markrad 0:cdf462088d13 326 int ret;
markrad 0:cdf462088d13 327 unsigned char check_tag[16];
markrad 0:cdf462088d13 328 unsigned char i;
markrad 0:cdf462088d13 329 int diff;
markrad 0:cdf462088d13 330
markrad 0:cdf462088d13 331 if( ( ret = ccm_auth_crypt( ctx, CCM_DECRYPT, length,
markrad 0:cdf462088d13 332 iv, iv_len, add, add_len,
markrad 0:cdf462088d13 333 input, output, check_tag, tag_len ) ) != 0 )
markrad 0:cdf462088d13 334 {
markrad 0:cdf462088d13 335 return( ret );
markrad 0:cdf462088d13 336 }
markrad 0:cdf462088d13 337
markrad 0:cdf462088d13 338 /* Check tag in "constant-time" */
markrad 0:cdf462088d13 339 for( diff = 0, i = 0; i < tag_len; i++ )
markrad 0:cdf462088d13 340 diff |= tag[i] ^ check_tag[i];
markrad 0:cdf462088d13 341
markrad 0:cdf462088d13 342 if( diff != 0 )
markrad 0:cdf462088d13 343 {
markrad 0:cdf462088d13 344 mbedtls_zeroize( output, length );
markrad 0:cdf462088d13 345 return( MBEDTLS_ERR_CCM_AUTH_FAILED );
markrad 0:cdf462088d13 346 }
markrad 0:cdf462088d13 347
markrad 0:cdf462088d13 348 return( 0 );
markrad 0:cdf462088d13 349 }
markrad 0:cdf462088d13 350
markrad 0:cdf462088d13 351
markrad 0:cdf462088d13 352 #if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
markrad 0:cdf462088d13 353 /*
markrad 0:cdf462088d13 354 * Examples 1 to 3 from SP800-38C Appendix C
markrad 0:cdf462088d13 355 */
markrad 0:cdf462088d13 356
markrad 0:cdf462088d13 357 #define NB_TESTS 3
markrad 0:cdf462088d13 358
markrad 0:cdf462088d13 359 /*
markrad 0:cdf462088d13 360 * The data is the same for all tests, only the used length changes
markrad 0:cdf462088d13 361 */
markrad 0:cdf462088d13 362 static const unsigned char key[] = {
markrad 0:cdf462088d13 363 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
markrad 0:cdf462088d13 364 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f
markrad 0:cdf462088d13 365 };
markrad 0:cdf462088d13 366
markrad 0:cdf462088d13 367 static const unsigned char iv[] = {
markrad 0:cdf462088d13 368 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
markrad 0:cdf462088d13 369 0x18, 0x19, 0x1a, 0x1b
markrad 0:cdf462088d13 370 };
markrad 0:cdf462088d13 371
markrad 0:cdf462088d13 372 static const unsigned char ad[] = {
markrad 0:cdf462088d13 373 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
markrad 0:cdf462088d13 374 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
markrad 0:cdf462088d13 375 0x10, 0x11, 0x12, 0x13
markrad 0:cdf462088d13 376 };
markrad 0:cdf462088d13 377
markrad 0:cdf462088d13 378 static const unsigned char msg[] = {
markrad 0:cdf462088d13 379 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
markrad 0:cdf462088d13 380 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
markrad 0:cdf462088d13 381 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
markrad 0:cdf462088d13 382 };
markrad 0:cdf462088d13 383
markrad 0:cdf462088d13 384 static const size_t iv_len [NB_TESTS] = { 7, 8, 12 };
markrad 0:cdf462088d13 385 static const size_t add_len[NB_TESTS] = { 8, 16, 20 };
markrad 0:cdf462088d13 386 static const size_t msg_len[NB_TESTS] = { 4, 16, 24 };
markrad 0:cdf462088d13 387 static const size_t tag_len[NB_TESTS] = { 4, 6, 8 };
markrad 0:cdf462088d13 388
markrad 0:cdf462088d13 389 static const unsigned char res[NB_TESTS][32] = {
markrad 0:cdf462088d13 390 { 0x71, 0x62, 0x01, 0x5b, 0x4d, 0xac, 0x25, 0x5d },
markrad 0:cdf462088d13 391 { 0xd2, 0xa1, 0xf0, 0xe0, 0x51, 0xea, 0x5f, 0x62,
markrad 0:cdf462088d13 392 0x08, 0x1a, 0x77, 0x92, 0x07, 0x3d, 0x59, 0x3d,
markrad 0:cdf462088d13 393 0x1f, 0xc6, 0x4f, 0xbf, 0xac, 0xcd },
markrad 0:cdf462088d13 394 { 0xe3, 0xb2, 0x01, 0xa9, 0xf5, 0xb7, 0x1a, 0x7a,
markrad 0:cdf462088d13 395 0x9b, 0x1c, 0xea, 0xec, 0xcd, 0x97, 0xe7, 0x0b,
markrad 0:cdf462088d13 396 0x61, 0x76, 0xaa, 0xd9, 0xa4, 0x42, 0x8a, 0xa5,
markrad 0:cdf462088d13 397 0x48, 0x43, 0x92, 0xfb, 0xc1, 0xb0, 0x99, 0x51 }
markrad 0:cdf462088d13 398 };
markrad 0:cdf462088d13 399
markrad 0:cdf462088d13 400 int mbedtls_ccm_self_test( int verbose )
markrad 0:cdf462088d13 401 {
markrad 0:cdf462088d13 402 mbedtls_ccm_context ctx;
markrad 0:cdf462088d13 403 unsigned char out[32];
markrad 0:cdf462088d13 404 size_t i;
markrad 0:cdf462088d13 405 int ret;
markrad 0:cdf462088d13 406
markrad 0:cdf462088d13 407 mbedtls_ccm_init( &ctx );
markrad 0:cdf462088d13 408
markrad 0:cdf462088d13 409 if( mbedtls_ccm_setkey( &ctx, MBEDTLS_CIPHER_ID_AES, key, 8 * sizeof key ) != 0 )
markrad 0:cdf462088d13 410 {
markrad 0:cdf462088d13 411 if( verbose != 0 )
markrad 0:cdf462088d13 412 mbedtls_printf( " CCM: setup failed" );
markrad 0:cdf462088d13 413
markrad 0:cdf462088d13 414 return( 1 );
markrad 0:cdf462088d13 415 }
markrad 0:cdf462088d13 416
markrad 0:cdf462088d13 417 for( i = 0; i < NB_TESTS; i++ )
markrad 0:cdf462088d13 418 {
markrad 0:cdf462088d13 419 if( verbose != 0 )
markrad 0:cdf462088d13 420 mbedtls_printf( " CCM-AES #%u: ", (unsigned int) i + 1 );
markrad 0:cdf462088d13 421
markrad 0:cdf462088d13 422 ret = mbedtls_ccm_encrypt_and_tag( &ctx, msg_len[i],
markrad 0:cdf462088d13 423 iv, iv_len[i], ad, add_len[i],
markrad 0:cdf462088d13 424 msg, out,
markrad 0:cdf462088d13 425 out + msg_len[i], tag_len[i] );
markrad 0:cdf462088d13 426
markrad 0:cdf462088d13 427 if( ret != 0 ||
markrad 0:cdf462088d13 428 memcmp( out, res[i], msg_len[i] + tag_len[i] ) != 0 )
markrad 0:cdf462088d13 429 {
markrad 0:cdf462088d13 430 if( verbose != 0 )
markrad 0:cdf462088d13 431 mbedtls_printf( "failed\n" );
markrad 0:cdf462088d13 432
markrad 0:cdf462088d13 433 return( 1 );
markrad 0:cdf462088d13 434 }
markrad 0:cdf462088d13 435
markrad 0:cdf462088d13 436 ret = mbedtls_ccm_auth_decrypt( &ctx, msg_len[i],
markrad 0:cdf462088d13 437 iv, iv_len[i], ad, add_len[i],
markrad 0:cdf462088d13 438 res[i], out,
markrad 0:cdf462088d13 439 res[i] + msg_len[i], tag_len[i] );
markrad 0:cdf462088d13 440
markrad 0:cdf462088d13 441 if( ret != 0 ||
markrad 0:cdf462088d13 442 memcmp( out, msg, msg_len[i] ) != 0 )
markrad 0:cdf462088d13 443 {
markrad 0:cdf462088d13 444 if( verbose != 0 )
markrad 0:cdf462088d13 445 mbedtls_printf( "failed\n" );
markrad 0:cdf462088d13 446
markrad 0:cdf462088d13 447 return( 1 );
markrad 0:cdf462088d13 448 }
markrad 0:cdf462088d13 449
markrad 0:cdf462088d13 450 if( verbose != 0 )
markrad 0:cdf462088d13 451 mbedtls_printf( "passed\n" );
markrad 0:cdf462088d13 452 }
markrad 0:cdf462088d13 453
markrad 0:cdf462088d13 454 mbedtls_ccm_free( &ctx );
markrad 0:cdf462088d13 455
markrad 0:cdf462088d13 456 if( verbose != 0 )
markrad 0:cdf462088d13 457 mbedtls_printf( "\n" );
markrad 0:cdf462088d13 458
markrad 0:cdf462088d13 459 return( 0 );
markrad 0:cdf462088d13 460 }
markrad 0:cdf462088d13 461
markrad 0:cdf462088d13 462 #endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
markrad 0:cdf462088d13 463
markrad 0:cdf462088d13 464 #endif /* MBEDTLS_CCM_C */