Kenji Arai / mbed-os_TYBLE16

mbed-os5 only for TYBLE16

Dependents:   TYBLE16_simple_data_logger TYBLE16_MP3_Air

features/mbedtls/mbed-crypto/src/ccm.c@1:9db0e321a9f4, 2019-12-31 (annotated)

Committer:
kenjiArai
Date:
Tue Dec 31 06:02:27 2019 +0000
Revision:
1:9db0e321a9f4
Parent:
0:5b88d5760320 
updated based on mbed-os5.15.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kenjiArai 0:5b88d5760320 1 /*
kenjiArai 0:5b88d5760320 2 * NIST SP800-38C compliant CCM implementation
kenjiArai 0:5b88d5760320 3 *
kenjiArai 0:5b88d5760320 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
kenjiArai 0:5b88d5760320 5 * SPDX-License-Identifier: Apache-2.0
kenjiArai 0:5b88d5760320 6 *
kenjiArai 0:5b88d5760320 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
kenjiArai 0:5b88d5760320 8 * not use this file except in compliance with the License.
kenjiArai 0:5b88d5760320 9 * You may obtain a copy of the License at
kenjiArai 0:5b88d5760320 10 *
kenjiArai 0:5b88d5760320 11 * http://www.apache.org/licenses/LICENSE-2.0
kenjiArai 0:5b88d5760320 12 *
kenjiArai 0:5b88d5760320 13 * Unless required by applicable law or agreed to in writing, software
kenjiArai 0:5b88d5760320 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
kenjiArai 0:5b88d5760320 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
kenjiArai 0:5b88d5760320 16 * See the License for the specific language governing permissions and
kenjiArai 0:5b88d5760320 17 * limitations under the License.
kenjiArai 0:5b88d5760320 18 *
kenjiArai 0:5b88d5760320 19 * This file is part of mbed TLS (https://tls.mbed.org)
kenjiArai 0:5b88d5760320 20 */
kenjiArai 0:5b88d5760320 21
kenjiArai 0:5b88d5760320 22 /*
kenjiArai 0:5b88d5760320 23 * Definition of CCM:
kenjiArai 0:5b88d5760320 24 * http://csrc.nist.gov/publications/nistpubs/800-38C/SP800-38C_updated-July20_2007.pdf
kenjiArai 0:5b88d5760320 25 * RFC 3610 "Counter with CBC-MAC (CCM)"
kenjiArai 0:5b88d5760320 26 *
kenjiArai 0:5b88d5760320 27 * Related:
kenjiArai 0:5b88d5760320 28 * RFC 5116 "An Interface and Algorithms for Authenticated Encryption"
kenjiArai 0:5b88d5760320 29 */
kenjiArai 0:5b88d5760320 30
kenjiArai 0:5b88d5760320 31 #if !defined(MBEDTLS_CONFIG_FILE)
kenjiArai 0:5b88d5760320 32 #include "mbedtls/config.h"
kenjiArai 0:5b88d5760320 33 #else
kenjiArai 0:5b88d5760320 34 #include MBEDTLS_CONFIG_FILE
kenjiArai 0:5b88d5760320 35 #endif
kenjiArai 0:5b88d5760320 36
kenjiArai 0:5b88d5760320 37 #if defined(MBEDTLS_CCM_C)
kenjiArai 0:5b88d5760320 38
kenjiArai 0:5b88d5760320 39 #include "mbedtls/ccm.h"
kenjiArai 0:5b88d5760320 40 #include "mbedtls/platform_util.h"
kenjiArai 0:5b88d5760320 41
kenjiArai 0:5b88d5760320 42 #include <string.h>
kenjiArai 0:5b88d5760320 43
kenjiArai 0:5b88d5760320 44 #if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
kenjiArai 0:5b88d5760320 45 #if defined(MBEDTLS_PLATFORM_C)
kenjiArai 0:5b88d5760320 46 #include "mbedtls/platform.h"
kenjiArai 0:5b88d5760320 47 #else
kenjiArai 0:5b88d5760320 48 #include <stdio.h>
kenjiArai 0:5b88d5760320 49 #define mbedtls_printf printf
kenjiArai 0:5b88d5760320 50 #endif /* MBEDTLS_PLATFORM_C */
kenjiArai 0:5b88d5760320 51 #endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
kenjiArai 0:5b88d5760320 52
kenjiArai 0:5b88d5760320 53 #if !defined(MBEDTLS_CCM_ALT)
kenjiArai 0:5b88d5760320 54
kenjiArai 0:5b88d5760320 55 #define CCM_VALIDATE_RET( cond ) \
kenjiArai 0:5b88d5760320 56 MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_CCM_BAD_INPUT )
kenjiArai 0:5b88d5760320 57 #define CCM_VALIDATE( cond ) \
kenjiArai 0:5b88d5760320 58 MBEDTLS_INTERNAL_VALIDATE( cond )
kenjiArai 0:5b88d5760320 59
kenjiArai 0:5b88d5760320 60 #define CCM_ENCRYPT 0
kenjiArai 0:5b88d5760320 61 #define CCM_DECRYPT 1
kenjiArai 0:5b88d5760320 62
kenjiArai 0:5b88d5760320 63 /*
kenjiArai 0:5b88d5760320 64 * Initialize context
kenjiArai 0:5b88d5760320 65 */
kenjiArai 0:5b88d5760320 66 void mbedtls_ccm_init( mbedtls_ccm_context *ctx )
kenjiArai 0:5b88d5760320 67 {
kenjiArai 0:5b88d5760320 68 CCM_VALIDATE( ctx != NULL );
kenjiArai 0:5b88d5760320 69 memset( ctx, 0, sizeof( mbedtls_ccm_context ) );
kenjiArai 0:5b88d5760320 70 }
kenjiArai 0:5b88d5760320 71
kenjiArai 0:5b88d5760320 72 int mbedtls_ccm_setkey( mbedtls_ccm_context *ctx,
kenjiArai 0:5b88d5760320 73 mbedtls_cipher_id_t cipher,
kenjiArai 0:5b88d5760320 74 const unsigned char *key,
kenjiArai 0:5b88d5760320 75 unsigned int keybits )
kenjiArai 0:5b88d5760320 76 {
kenjiArai 0:5b88d5760320 77 int ret;
kenjiArai 0:5b88d5760320 78 const mbedtls_cipher_info_t *cipher_info;
kenjiArai 0:5b88d5760320 79
kenjiArai 0:5b88d5760320 80 CCM_VALIDATE_RET( ctx != NULL );
kenjiArai 0:5b88d5760320 81 CCM_VALIDATE_RET( key != NULL );
kenjiArai 0:5b88d5760320 82
kenjiArai 0:5b88d5760320 83 cipher_info = mbedtls_cipher_info_from_values( cipher, keybits,
kenjiArai 0:5b88d5760320 84 MBEDTLS_MODE_ECB );
kenjiArai 0:5b88d5760320 85 if( cipher_info == NULL )
kenjiArai 0:5b88d5760320 86 return( MBEDTLS_ERR_CCM_BAD_INPUT );
kenjiArai 0:5b88d5760320 87
kenjiArai 0:5b88d5760320 88 if( cipher_info->block_size != 16 )
kenjiArai 0:5b88d5760320 89 return( MBEDTLS_ERR_CCM_BAD_INPUT );
kenjiArai 0:5b88d5760320 90
kenjiArai 0:5b88d5760320 91 mbedtls_cipher_free( &ctx->cipher_ctx );
kenjiArai 0:5b88d5760320 92
kenjiArai 0:5b88d5760320 93 if( ( ret = mbedtls_cipher_setup( &ctx->cipher_ctx, cipher_info ) ) != 0 )
kenjiArai 0:5b88d5760320 94 return( ret );
kenjiArai 0:5b88d5760320 95
kenjiArai 0:5b88d5760320 96 if( ( ret = mbedtls_cipher_setkey( &ctx->cipher_ctx, key, keybits,
kenjiArai 0:5b88d5760320 97 MBEDTLS_ENCRYPT ) ) != 0 )
kenjiArai 0:5b88d5760320 98 {
kenjiArai 0:5b88d5760320 99 return( ret );
kenjiArai 0:5b88d5760320 100 }
kenjiArai 0:5b88d5760320 101
kenjiArai 0:5b88d5760320 102 return( 0 );
kenjiArai 0:5b88d5760320 103 }
kenjiArai 0:5b88d5760320 104
kenjiArai 0:5b88d5760320 105 /*
kenjiArai 0:5b88d5760320 106 * Free context
kenjiArai 0:5b88d5760320 107 */
kenjiArai 0:5b88d5760320 108 void mbedtls_ccm_free( mbedtls_ccm_context *ctx )
kenjiArai 0:5b88d5760320 109 {
kenjiArai 0:5b88d5760320 110 if( ctx == NULL )
kenjiArai 0:5b88d5760320 111 return;
kenjiArai 0:5b88d5760320 112 mbedtls_cipher_free( &ctx->cipher_ctx );
kenjiArai 0:5b88d5760320 113 mbedtls_platform_zeroize( ctx, sizeof( mbedtls_ccm_context ) );
kenjiArai 0:5b88d5760320 114 }
kenjiArai 0:5b88d5760320 115
kenjiArai 0:5b88d5760320 116 /*
kenjiArai 0:5b88d5760320 117 * Macros for common operations.
kenjiArai 0:5b88d5760320 118 * Results in smaller compiled code than static inline functions.
kenjiArai 0:5b88d5760320 119 */
kenjiArai 0:5b88d5760320 120
kenjiArai 0:5b88d5760320 121 /*
kenjiArai 0:5b88d5760320 122 * Update the CBC-MAC state in y using a block in b
kenjiArai 0:5b88d5760320 123 * (Always using b as the source helps the compiler optimise a bit better.)
kenjiArai 0:5b88d5760320 124 */
kenjiArai 0:5b88d5760320 125 #define UPDATE_CBC_MAC \
kenjiArai 0:5b88d5760320 126 for( i = 0; i < 16; i++ ) \
kenjiArai 0:5b88d5760320 127 y[i] ^= b[i]; \
kenjiArai 0:5b88d5760320 128 \
kenjiArai 0:5b88d5760320 129 if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, y, 16, y, &olen ) ) != 0 ) \
kenjiArai 0:5b88d5760320 130 return( ret );
kenjiArai 0:5b88d5760320 131
kenjiArai 0:5b88d5760320 132 /*
kenjiArai 0:5b88d5760320 133 * Encrypt or decrypt a partial block with CTR
kenjiArai 0:5b88d5760320 134 * Warning: using b for temporary storage! src and dst must not be b!
kenjiArai 0:5b88d5760320 135 * This avoids allocating one more 16 bytes buffer while allowing src == dst.
kenjiArai 0:5b88d5760320 136 */
kenjiArai 0:5b88d5760320 137 #define CTR_CRYPT( dst, src, len ) \
kenjiArai 0:5b88d5760320 138 do \
kenjiArai 0:5b88d5760320 139 { \
kenjiArai 0:5b88d5760320 140 if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, ctr, \
kenjiArai 0:5b88d5760320 141 16, b, &olen ) ) != 0 ) \
kenjiArai 0:5b88d5760320 142 { \
kenjiArai 0:5b88d5760320 143 return( ret ); \
kenjiArai 0:5b88d5760320 144 } \
kenjiArai 0:5b88d5760320 145 \
kenjiArai 0:5b88d5760320 146 for( i = 0; i < (len); i++ ) \
kenjiArai 0:5b88d5760320 147 (dst)[i] = (src)[i] ^ b[i]; \
kenjiArai 0:5b88d5760320 148 } while( 0 )
kenjiArai 0:5b88d5760320 149
kenjiArai 0:5b88d5760320 150 /*
kenjiArai 0:5b88d5760320 151 * Authenticated encryption or decryption
kenjiArai 0:5b88d5760320 152 */
kenjiArai 0:5b88d5760320 153 static int ccm_auth_crypt( mbedtls_ccm_context *ctx, int mode, size_t length,
kenjiArai 0:5b88d5760320 154 const unsigned char *iv, size_t iv_len,
kenjiArai 0:5b88d5760320 155 const unsigned char *add, size_t add_len,
kenjiArai 0:5b88d5760320 156 const unsigned char *input, unsigned char *output,
kenjiArai 0:5b88d5760320 157 unsigned char *tag, size_t tag_len )
kenjiArai 0:5b88d5760320 158 {
kenjiArai 0:5b88d5760320 159 int ret;
kenjiArai 0:5b88d5760320 160 unsigned char i;
kenjiArai 0:5b88d5760320 161 unsigned char q;
kenjiArai 0:5b88d5760320 162 size_t len_left, olen;
kenjiArai 0:5b88d5760320 163 unsigned char b[16];
kenjiArai 0:5b88d5760320 164 unsigned char y[16];
kenjiArai 0:5b88d5760320 165 unsigned char ctr[16];
kenjiArai 0:5b88d5760320 166 const unsigned char *src;
kenjiArai 0:5b88d5760320 167 unsigned char *dst;
kenjiArai 0:5b88d5760320 168
kenjiArai 0:5b88d5760320 169 /*
kenjiArai 0:5b88d5760320 170 * Check length requirements: SP800-38C A.1
kenjiArai 0:5b88d5760320 171 * Additional requirement: a < 2^16 - 2^8 to simplify the code.
kenjiArai 0:5b88d5760320 172 * 'length' checked later (when writing it to the first block)
kenjiArai 0:5b88d5760320 173 *
kenjiArai 0:5b88d5760320 174 * Also, loosen the requirements to enable support for CCM* (IEEE 802.15.4).
kenjiArai 0:5b88d5760320 175 */
kenjiArai 0:5b88d5760320 176 if( tag_len == 2 || tag_len > 16 || tag_len % 2 != 0 )
kenjiArai 0:5b88d5760320 177 return( MBEDTLS_ERR_CCM_BAD_INPUT );
kenjiArai 0:5b88d5760320 178
kenjiArai 0:5b88d5760320 179 /* Also implies q is within bounds */
kenjiArai 0:5b88d5760320 180 if( iv_len < 7 || iv_len > 13 )
kenjiArai 0:5b88d5760320 181 return( MBEDTLS_ERR_CCM_BAD_INPUT );
kenjiArai 0:5b88d5760320 182
kenjiArai 0:5b88d5760320 183 if( add_len > 0xFF00 )
kenjiArai 0:5b88d5760320 184 return( MBEDTLS_ERR_CCM_BAD_INPUT );
kenjiArai 0:5b88d5760320 185
kenjiArai 0:5b88d5760320 186 q = 16 - 1 - (unsigned char) iv_len;
kenjiArai 0:5b88d5760320 187
kenjiArai 0:5b88d5760320 188 /*
kenjiArai 0:5b88d5760320 189 * First block B_0:
kenjiArai 0:5b88d5760320 190 * 0 .. 0 flags
kenjiArai 0:5b88d5760320 191 * 1 .. iv_len nonce (aka iv)
kenjiArai 0:5b88d5760320 192 * iv_len+1 .. 15 length
kenjiArai 0:5b88d5760320 193 *
kenjiArai 0:5b88d5760320 194 * With flags as (bits):
kenjiArai 0:5b88d5760320 195 * 7 0
kenjiArai 0:5b88d5760320 196 * 6 add present?
kenjiArai 0:5b88d5760320 197 * 5 .. 3 (t - 2) / 2
kenjiArai 0:5b88d5760320 198 * 2 .. 0 q - 1
kenjiArai 0:5b88d5760320 199 */
kenjiArai 0:5b88d5760320 200 b[0] = 0;
kenjiArai 0:5b88d5760320 201 b[0] |= ( add_len > 0 ) << 6;
kenjiArai 0:5b88d5760320 202 b[0] |= ( ( tag_len - 2 ) / 2 ) << 3;
kenjiArai 0:5b88d5760320 203 b[0] |= q - 1;
kenjiArai 0:5b88d5760320 204
kenjiArai 0:5b88d5760320 205 memcpy( b + 1, iv, iv_len );
kenjiArai 0:5b88d5760320 206
kenjiArai 0:5b88d5760320 207 for( i = 0, len_left = length; i < q; i++, len_left >>= 8 )
kenjiArai 0:5b88d5760320 208 b[15-i] = (unsigned char)( len_left & 0xFF );
kenjiArai 0:5b88d5760320 209
kenjiArai 0:5b88d5760320 210 if( len_left > 0 )
kenjiArai 0:5b88d5760320 211 return( MBEDTLS_ERR_CCM_BAD_INPUT );
kenjiArai 0:5b88d5760320 212
kenjiArai 0:5b88d5760320 213
kenjiArai 0:5b88d5760320 214 /* Start CBC-MAC with first block */
kenjiArai 0:5b88d5760320 215 memset( y, 0, 16 );
kenjiArai 0:5b88d5760320 216 UPDATE_CBC_MAC;
kenjiArai 0:5b88d5760320 217
kenjiArai 0:5b88d5760320 218 /*
kenjiArai 0:5b88d5760320 219 * If there is additional data, update CBC-MAC with
kenjiArai 0:5b88d5760320 220 * add_len, add, 0 (padding to a block boundary)
kenjiArai 0:5b88d5760320 221 */
kenjiArai 0:5b88d5760320 222 if( add_len > 0 )
kenjiArai 0:5b88d5760320 223 {
kenjiArai 0:5b88d5760320 224 size_t use_len;
kenjiArai 0:5b88d5760320 225 len_left = add_len;
kenjiArai 0:5b88d5760320 226 src = add;
kenjiArai 0:5b88d5760320 227
kenjiArai 0:5b88d5760320 228 memset( b, 0, 16 );
kenjiArai 0:5b88d5760320 229 b[0] = (unsigned char)( ( add_len >> 8 ) & 0xFF );
kenjiArai 0:5b88d5760320 230 b[1] = (unsigned char)( ( add_len ) & 0xFF );
kenjiArai 0:5b88d5760320 231
kenjiArai 0:5b88d5760320 232 use_len = len_left < 16 - 2 ? len_left : 16 - 2;
kenjiArai 0:5b88d5760320 233 memcpy( b + 2, src, use_len );
kenjiArai 0:5b88d5760320 234 len_left -= use_len;
kenjiArai 0:5b88d5760320 235 src += use_len;
kenjiArai 0:5b88d5760320 236
kenjiArai 0:5b88d5760320 237 UPDATE_CBC_MAC;
kenjiArai 0:5b88d5760320 238
kenjiArai 0:5b88d5760320 239 while( len_left > 0 )
kenjiArai 0:5b88d5760320 240 {
kenjiArai 0:5b88d5760320 241 use_len = len_left > 16 ? 16 : len_left;
kenjiArai 0:5b88d5760320 242
kenjiArai 0:5b88d5760320 243 memset( b, 0, 16 );
kenjiArai 0:5b88d5760320 244 memcpy( b, src, use_len );
kenjiArai 0:5b88d5760320 245 UPDATE_CBC_MAC;
kenjiArai 0:5b88d5760320 246
kenjiArai 0:5b88d5760320 247 len_left -= use_len;
kenjiArai 0:5b88d5760320 248 src += use_len;
kenjiArai 0:5b88d5760320 249 }
kenjiArai 0:5b88d5760320 250 }
kenjiArai 0:5b88d5760320 251
kenjiArai 0:5b88d5760320 252 /*
kenjiArai 0:5b88d5760320 253 * Prepare counter block for encryption:
kenjiArai 0:5b88d5760320 254 * 0 .. 0 flags
kenjiArai 0:5b88d5760320 255 * 1 .. iv_len nonce (aka iv)
kenjiArai 0:5b88d5760320 256 * iv_len+1 .. 15 counter (initially 1)
kenjiArai 0:5b88d5760320 257 *
kenjiArai 0:5b88d5760320 258 * With flags as (bits):
kenjiArai 0:5b88d5760320 259 * 7 .. 3 0
kenjiArai 0:5b88d5760320 260 * 2 .. 0 q - 1
kenjiArai 0:5b88d5760320 261 */
kenjiArai 0:5b88d5760320 262 ctr[0] = q - 1;
kenjiArai 0:5b88d5760320 263 memcpy( ctr + 1, iv, iv_len );
kenjiArai 0:5b88d5760320 264 memset( ctr + 1 + iv_len, 0, q );
kenjiArai 0:5b88d5760320 265 ctr[15] = 1;
kenjiArai 0:5b88d5760320 266
kenjiArai 0:5b88d5760320 267 /*
kenjiArai 0:5b88d5760320 268 * Authenticate and {en,de}crypt the message.
kenjiArai 0:5b88d5760320 269 *
kenjiArai 0:5b88d5760320 270 * The only difference between encryption and decryption is
kenjiArai 0:5b88d5760320 271 * the respective order of authentication and {en,de}cryption.
kenjiArai 0:5b88d5760320 272 */
kenjiArai 0:5b88d5760320 273 len_left = length;
kenjiArai 0:5b88d5760320 274 src = input;
kenjiArai 0:5b88d5760320 275 dst = output;
kenjiArai 0:5b88d5760320 276
kenjiArai 0:5b88d5760320 277 while( len_left > 0 )
kenjiArai 0:5b88d5760320 278 {
kenjiArai 0:5b88d5760320 279 size_t use_len = len_left > 16 ? 16 : len_left;
kenjiArai 0:5b88d5760320 280
kenjiArai 0:5b88d5760320 281 if( mode == CCM_ENCRYPT )
kenjiArai 0:5b88d5760320 282 {
kenjiArai 0:5b88d5760320 283 memset( b, 0, 16 );
kenjiArai 0:5b88d5760320 284 memcpy( b, src, use_len );
kenjiArai 0:5b88d5760320 285 UPDATE_CBC_MAC;
kenjiArai 0:5b88d5760320 286 }
kenjiArai 0:5b88d5760320 287
kenjiArai 0:5b88d5760320 288 CTR_CRYPT( dst, src, use_len );
kenjiArai 0:5b88d5760320 289
kenjiArai 0:5b88d5760320 290 if( mode == CCM_DECRYPT )
kenjiArai 0:5b88d5760320 291 {
kenjiArai 0:5b88d5760320 292 memset( b, 0, 16 );
kenjiArai 0:5b88d5760320 293 memcpy( b, dst, use_len );
kenjiArai 0:5b88d5760320 294 UPDATE_CBC_MAC;
kenjiArai 0:5b88d5760320 295 }
kenjiArai 0:5b88d5760320 296
kenjiArai 0:5b88d5760320 297 dst += use_len;
kenjiArai 0:5b88d5760320 298 src += use_len;
kenjiArai 0:5b88d5760320 299 len_left -= use_len;
kenjiArai 0:5b88d5760320 300
kenjiArai 0:5b88d5760320 301 /*
kenjiArai 0:5b88d5760320 302 * Increment counter.
kenjiArai 0:5b88d5760320 303 * No need to check for overflow thanks to the length check above.
kenjiArai 0:5b88d5760320 304 */
kenjiArai 0:5b88d5760320 305 for( i = 0; i < q; i++ )
kenjiArai 0:5b88d5760320 306 if( ++ctr[15-i] != 0 )
kenjiArai 0:5b88d5760320 307 break;
kenjiArai 0:5b88d5760320 308 }
kenjiArai 0:5b88d5760320 309
kenjiArai 0:5b88d5760320 310 /*
kenjiArai 0:5b88d5760320 311 * Authentication: reset counter and crypt/mask internal tag
kenjiArai 0:5b88d5760320 312 */
kenjiArai 0:5b88d5760320 313 for( i = 0; i < q; i++ )
kenjiArai 0:5b88d5760320 314 ctr[15-i] = 0;
kenjiArai 0:5b88d5760320 315
kenjiArai 0:5b88d5760320 316 CTR_CRYPT( y, y, 16 );
kenjiArai 0:5b88d5760320 317 memcpy( tag, y, tag_len );
kenjiArai 0:5b88d5760320 318
kenjiArai 0:5b88d5760320 319 return( 0 );
kenjiArai 0:5b88d5760320 320 }
kenjiArai 0:5b88d5760320 321
kenjiArai 0:5b88d5760320 322 /*
kenjiArai 0:5b88d5760320 323 * Authenticated encryption
kenjiArai 0:5b88d5760320 324 */
kenjiArai 0:5b88d5760320 325 int mbedtls_ccm_star_encrypt_and_tag( mbedtls_ccm_context *ctx, size_t length,
kenjiArai 0:5b88d5760320 326 const unsigned char *iv, size_t iv_len,
kenjiArai 0:5b88d5760320 327 const unsigned char *add, size_t add_len,
kenjiArai 0:5b88d5760320 328 const unsigned char *input, unsigned char *output,
kenjiArai 0:5b88d5760320 329 unsigned char *tag, size_t tag_len )
kenjiArai 0:5b88d5760320 330 {
kenjiArai 0:5b88d5760320 331 CCM_VALIDATE_RET( ctx != NULL );
kenjiArai 0:5b88d5760320 332 CCM_VALIDATE_RET( iv != NULL );
kenjiArai 0:5b88d5760320 333 CCM_VALIDATE_RET( add_len == 0 || add != NULL );
kenjiArai 0:5b88d5760320 334 CCM_VALIDATE_RET( length == 0 || input != NULL );
kenjiArai 0:5b88d5760320 335 CCM_VALIDATE_RET( length == 0 || output != NULL );
kenjiArai 0:5b88d5760320 336 CCM_VALIDATE_RET( tag_len == 0 || tag != NULL );
kenjiArai 0:5b88d5760320 337 return( ccm_auth_crypt( ctx, CCM_ENCRYPT, length, iv, iv_len,
kenjiArai 0:5b88d5760320 338 add, add_len, input, output, tag, tag_len ) );
kenjiArai 0:5b88d5760320 339 }
kenjiArai 0:5b88d5760320 340
kenjiArai 0:5b88d5760320 341 int mbedtls_ccm_encrypt_and_tag( mbedtls_ccm_context *ctx, size_t length,
kenjiArai 0:5b88d5760320 342 const unsigned char *iv, size_t iv_len,
kenjiArai 0:5b88d5760320 343 const unsigned char *add, size_t add_len,
kenjiArai 0:5b88d5760320 344 const unsigned char *input, unsigned char *output,
kenjiArai 0:5b88d5760320 345 unsigned char *tag, size_t tag_len )
kenjiArai 0:5b88d5760320 346 {
kenjiArai 0:5b88d5760320 347 CCM_VALIDATE_RET( ctx != NULL );
kenjiArai 0:5b88d5760320 348 CCM_VALIDATE_RET( iv != NULL );
kenjiArai 0:5b88d5760320 349 CCM_VALIDATE_RET( add_len == 0 || add != NULL );
kenjiArai 0:5b88d5760320 350 CCM_VALIDATE_RET( length == 0 || input != NULL );
kenjiArai 0:5b88d5760320 351 CCM_VALIDATE_RET( length == 0 || output != NULL );
kenjiArai 0:5b88d5760320 352 CCM_VALIDATE_RET( tag_len == 0 || tag != NULL );
kenjiArai 0:5b88d5760320 353 if( tag_len == 0 )
kenjiArai 0:5b88d5760320 354 return( MBEDTLS_ERR_CCM_BAD_INPUT );
kenjiArai 0:5b88d5760320 355
kenjiArai 0:5b88d5760320 356 return( mbedtls_ccm_star_encrypt_and_tag( ctx, length, iv, iv_len, add,
kenjiArai 0:5b88d5760320 357 add_len, input, output, tag, tag_len ) );
kenjiArai 0:5b88d5760320 358 }
kenjiArai 0:5b88d5760320 359
kenjiArai 0:5b88d5760320 360 /*
kenjiArai 0:5b88d5760320 361 * Authenticated decryption
kenjiArai 0:5b88d5760320 362 */
kenjiArai 0:5b88d5760320 363 int mbedtls_ccm_star_auth_decrypt( mbedtls_ccm_context *ctx, size_t length,
kenjiArai 0:5b88d5760320 364 const unsigned char *iv, size_t iv_len,
kenjiArai 0:5b88d5760320 365 const unsigned char *add, size_t add_len,
kenjiArai 0:5b88d5760320 366 const unsigned char *input, unsigned char *output,
kenjiArai 0:5b88d5760320 367 const unsigned char *tag, size_t tag_len )
kenjiArai 0:5b88d5760320 368 {
kenjiArai 0:5b88d5760320 369 int ret;
kenjiArai 0:5b88d5760320 370 unsigned char check_tag[16];
kenjiArai 0:5b88d5760320 371 unsigned char i;
kenjiArai 0:5b88d5760320 372 int diff;
kenjiArai 0:5b88d5760320 373
kenjiArai 0:5b88d5760320 374 CCM_VALIDATE_RET( ctx != NULL );
kenjiArai 0:5b88d5760320 375 CCM_VALIDATE_RET( iv != NULL );
kenjiArai 0:5b88d5760320 376 CCM_VALIDATE_RET( add_len == 0 || add != NULL );
kenjiArai 0:5b88d5760320 377 CCM_VALIDATE_RET( length == 0 || input != NULL );
kenjiArai 0:5b88d5760320 378 CCM_VALIDATE_RET( length == 0 || output != NULL );
kenjiArai 0:5b88d5760320 379 CCM_VALIDATE_RET( tag_len == 0 || tag != NULL );
kenjiArai 0:5b88d5760320 380
kenjiArai 0:5b88d5760320 381 if( ( ret = ccm_auth_crypt( ctx, CCM_DECRYPT, length,
kenjiArai 0:5b88d5760320 382 iv, iv_len, add, add_len,
kenjiArai 0:5b88d5760320 383 input, output, check_tag, tag_len ) ) != 0 )
kenjiArai 0:5b88d5760320 384 {
kenjiArai 0:5b88d5760320 385 return( ret );
kenjiArai 0:5b88d5760320 386 }
kenjiArai 0:5b88d5760320 387
kenjiArai 0:5b88d5760320 388 /* Check tag in "constant-time" */
kenjiArai 0:5b88d5760320 389 for( diff = 0, i = 0; i < tag_len; i++ )
kenjiArai 0:5b88d5760320 390 diff |= tag[i] ^ check_tag[i];
kenjiArai 0:5b88d5760320 391
kenjiArai 0:5b88d5760320 392 if( diff != 0 )
kenjiArai 0:5b88d5760320 393 {
kenjiArai 0:5b88d5760320 394 mbedtls_platform_zeroize( output, length );
kenjiArai 0:5b88d5760320 395 return( MBEDTLS_ERR_CCM_AUTH_FAILED );
kenjiArai 0:5b88d5760320 396 }
kenjiArai 0:5b88d5760320 397
kenjiArai 0:5b88d5760320 398 return( 0 );
kenjiArai 0:5b88d5760320 399 }
kenjiArai 0:5b88d5760320 400
kenjiArai 0:5b88d5760320 401 int mbedtls_ccm_auth_decrypt( mbedtls_ccm_context *ctx, size_t length,
kenjiArai 0:5b88d5760320 402 const unsigned char *iv, size_t iv_len,
kenjiArai 0:5b88d5760320 403 const unsigned char *add, size_t add_len,
kenjiArai 0:5b88d5760320 404 const unsigned char *input, unsigned char *output,
kenjiArai 0:5b88d5760320 405 const unsigned char *tag, size_t tag_len )
kenjiArai 0:5b88d5760320 406 {
kenjiArai 0:5b88d5760320 407 CCM_VALIDATE_RET( ctx != NULL );
kenjiArai 0:5b88d5760320 408 CCM_VALIDATE_RET( iv != NULL );
kenjiArai 0:5b88d5760320 409 CCM_VALIDATE_RET( add_len == 0 || add != NULL );
kenjiArai 0:5b88d5760320 410 CCM_VALIDATE_RET( length == 0 || input != NULL );
kenjiArai 0:5b88d5760320 411 CCM_VALIDATE_RET( length == 0 || output != NULL );
kenjiArai 0:5b88d5760320 412 CCM_VALIDATE_RET( tag_len == 0 || tag != NULL );
kenjiArai 0:5b88d5760320 413
kenjiArai 0:5b88d5760320 414 if( tag_len == 0 )
kenjiArai 0:5b88d5760320 415 return( MBEDTLS_ERR_CCM_BAD_INPUT );
kenjiArai 0:5b88d5760320 416
kenjiArai 0:5b88d5760320 417 return( mbedtls_ccm_star_auth_decrypt( ctx, length, iv, iv_len, add,
kenjiArai 0:5b88d5760320 418 add_len, input, output, tag, tag_len ) );
kenjiArai 0:5b88d5760320 419 }
kenjiArai 0:5b88d5760320 420 #endif /* !MBEDTLS_CCM_ALT */
kenjiArai 0:5b88d5760320 421
kenjiArai 0:5b88d5760320 422 #if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
kenjiArai 0:5b88d5760320 423 /*
kenjiArai 0:5b88d5760320 424 * Examples 1 to 3 from SP800-38C Appendix C
kenjiArai 0:5b88d5760320 425 */
kenjiArai 0:5b88d5760320 426
kenjiArai 0:5b88d5760320 427 #define NB_TESTS 3
kenjiArai 0:5b88d5760320 428 #define CCM_SELFTEST_PT_MAX_LEN 24
kenjiArai 0:5b88d5760320 429 #define CCM_SELFTEST_CT_MAX_LEN 32
kenjiArai 0:5b88d5760320 430 /*
kenjiArai 0:5b88d5760320 431 * The data is the same for all tests, only the used length changes
kenjiArai 0:5b88d5760320 432 */
kenjiArai 0:5b88d5760320 433 static const unsigned char key_test_data[] = {
kenjiArai 0:5b88d5760320 434 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
kenjiArai 0:5b88d5760320 435 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f
kenjiArai 0:5b88d5760320 436 };
kenjiArai 0:5b88d5760320 437
kenjiArai 0:5b88d5760320 438 static const unsigned char iv_test_data[] = {
kenjiArai 0:5b88d5760320 439 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
kenjiArai 0:5b88d5760320 440 0x18, 0x19, 0x1a, 0x1b
kenjiArai 0:5b88d5760320 441 };
kenjiArai 0:5b88d5760320 442
kenjiArai 0:5b88d5760320 443 static const unsigned char ad_test_data[] = {
kenjiArai 0:5b88d5760320 444 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
kenjiArai 0:5b88d5760320 445 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
kenjiArai 0:5b88d5760320 446 0x10, 0x11, 0x12, 0x13
kenjiArai 0:5b88d5760320 447 };
kenjiArai 0:5b88d5760320 448
kenjiArai 0:5b88d5760320 449 static const unsigned char msg_test_data[CCM_SELFTEST_PT_MAX_LEN] = {
kenjiArai 0:5b88d5760320 450 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
kenjiArai 0:5b88d5760320 451 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
kenjiArai 0:5b88d5760320 452 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
kenjiArai 0:5b88d5760320 453 };
kenjiArai 0:5b88d5760320 454
kenjiArai 0:5b88d5760320 455 static const size_t iv_len_test_data [NB_TESTS] = { 7, 8, 12 };
kenjiArai 0:5b88d5760320 456 static const size_t add_len_test_data[NB_TESTS] = { 8, 16, 20 };
kenjiArai 0:5b88d5760320 457 static const size_t msg_len_test_data[NB_TESTS] = { 4, 16, 24 };
kenjiArai 0:5b88d5760320 458 static const size_t tag_len_test_data[NB_TESTS] = { 4, 6, 8 };
kenjiArai 0:5b88d5760320 459
kenjiArai 0:5b88d5760320 460 static const unsigned char res_test_data[NB_TESTS][CCM_SELFTEST_CT_MAX_LEN] = {
kenjiArai 0:5b88d5760320 461 { 0x71, 0x62, 0x01, 0x5b, 0x4d, 0xac, 0x25, 0x5d },
kenjiArai 0:5b88d5760320 462 { 0xd2, 0xa1, 0xf0, 0xe0, 0x51, 0xea, 0x5f, 0x62,
kenjiArai 0:5b88d5760320 463 0x08, 0x1a, 0x77, 0x92, 0x07, 0x3d, 0x59, 0x3d,
kenjiArai 0:5b88d5760320 464 0x1f, 0xc6, 0x4f, 0xbf, 0xac, 0xcd },
kenjiArai 0:5b88d5760320 465 { 0xe3, 0xb2, 0x01, 0xa9, 0xf5, 0xb7, 0x1a, 0x7a,
kenjiArai 0:5b88d5760320 466 0x9b, 0x1c, 0xea, 0xec, 0xcd, 0x97, 0xe7, 0x0b,
kenjiArai 0:5b88d5760320 467 0x61, 0x76, 0xaa, 0xd9, 0xa4, 0x42, 0x8a, 0xa5,
kenjiArai 0:5b88d5760320 468 0x48, 0x43, 0x92, 0xfb, 0xc1, 0xb0, 0x99, 0x51 }
kenjiArai 0:5b88d5760320 469 };
kenjiArai 0:5b88d5760320 470
kenjiArai 0:5b88d5760320 471 int mbedtls_ccm_self_test( int verbose )
kenjiArai 0:5b88d5760320 472 {
kenjiArai 0:5b88d5760320 473 mbedtls_ccm_context ctx;
kenjiArai 0:5b88d5760320 474 /*
kenjiArai 0:5b88d5760320 475 * Some hardware accelerators require the input and output buffers
kenjiArai 0:5b88d5760320 476 * would be in RAM, because the flash is not accessible.
kenjiArai 0:5b88d5760320 477 * Use buffers on the stack to hold the test vectors data.
kenjiArai 0:5b88d5760320 478 */
kenjiArai 0:5b88d5760320 479 unsigned char plaintext[CCM_SELFTEST_PT_MAX_LEN];
kenjiArai 0:5b88d5760320 480 unsigned char ciphertext[CCM_SELFTEST_CT_MAX_LEN];
kenjiArai 0:5b88d5760320 481 size_t i;
kenjiArai 0:5b88d5760320 482 int ret;
kenjiArai 0:5b88d5760320 483
kenjiArai 0:5b88d5760320 484 mbedtls_ccm_init( &ctx );
kenjiArai 0:5b88d5760320 485
kenjiArai 0:5b88d5760320 486 if( mbedtls_ccm_setkey( &ctx, MBEDTLS_CIPHER_ID_AES, key_test_data,
kenjiArai 0:5b88d5760320 487 8 * sizeof key_test_data ) != 0 )
kenjiArai 0:5b88d5760320 488 {
kenjiArai 0:5b88d5760320 489 if( verbose != 0 )
kenjiArai 0:5b88d5760320 490 mbedtls_printf( " CCM: setup failed" );
kenjiArai 0:5b88d5760320 491
kenjiArai 0:5b88d5760320 492 return( 1 );
kenjiArai 0:5b88d5760320 493 }
kenjiArai 0:5b88d5760320 494
kenjiArai 0:5b88d5760320 495 for( i = 0; i < NB_TESTS; i++ )
kenjiArai 0:5b88d5760320 496 {
kenjiArai 0:5b88d5760320 497 if( verbose != 0 )
kenjiArai 0:5b88d5760320 498 mbedtls_printf( " CCM-AES #%u: ", (unsigned int) i + 1 );
kenjiArai 0:5b88d5760320 499
kenjiArai 0:5b88d5760320 500 memset( plaintext, 0, CCM_SELFTEST_PT_MAX_LEN );
kenjiArai 0:5b88d5760320 501 memset( ciphertext, 0, CCM_SELFTEST_CT_MAX_LEN );
kenjiArai 0:5b88d5760320 502 memcpy( plaintext, msg_test_data, msg_len_test_data[i] );
kenjiArai 0:5b88d5760320 503
kenjiArai 0:5b88d5760320 504 ret = mbedtls_ccm_encrypt_and_tag( &ctx, msg_len_test_data[i],
kenjiArai 0:5b88d5760320 505 iv_test_data, iv_len_test_data[i],
kenjiArai 0:5b88d5760320 506 ad_test_data, add_len_test_data[i],
kenjiArai 0:5b88d5760320 507 plaintext, ciphertext,
kenjiArai 0:5b88d5760320 508 ciphertext + msg_len_test_data[i],
kenjiArai 0:5b88d5760320 509 tag_len_test_data[i] );
kenjiArai 0:5b88d5760320 510
kenjiArai 0:5b88d5760320 511 if( ret != 0 ||
kenjiArai 0:5b88d5760320 512 memcmp( ciphertext, res_test_data[i],
kenjiArai 0:5b88d5760320 513 msg_len_test_data[i] + tag_len_test_data[i] ) != 0 )
kenjiArai 0:5b88d5760320 514 {
kenjiArai 0:5b88d5760320 515 if( verbose != 0 )
kenjiArai 0:5b88d5760320 516 mbedtls_printf( "failed\n" );
kenjiArai 0:5b88d5760320 517
kenjiArai 0:5b88d5760320 518 return( 1 );
kenjiArai 0:5b88d5760320 519 }
kenjiArai 0:5b88d5760320 520 memset( plaintext, 0, CCM_SELFTEST_PT_MAX_LEN );
kenjiArai 0:5b88d5760320 521
kenjiArai 0:5b88d5760320 522 ret = mbedtls_ccm_auth_decrypt( &ctx, msg_len_test_data[i],
kenjiArai 0:5b88d5760320 523 iv_test_data, iv_len_test_data[i],
kenjiArai 0:5b88d5760320 524 ad_test_data, add_len_test_data[i],
kenjiArai 0:5b88d5760320 525 ciphertext, plaintext,
kenjiArai 0:5b88d5760320 526 ciphertext + msg_len_test_data[i],
kenjiArai 0:5b88d5760320 527 tag_len_test_data[i] );
kenjiArai 0:5b88d5760320 528
kenjiArai 0:5b88d5760320 529 if( ret != 0 ||
kenjiArai 0:5b88d5760320 530 memcmp( plaintext, msg_test_data, msg_len_test_data[i] ) != 0 )
kenjiArai 0:5b88d5760320 531 {
kenjiArai 0:5b88d5760320 532 if( verbose != 0 )
kenjiArai 0:5b88d5760320 533 mbedtls_printf( "failed\n" );
kenjiArai 0:5b88d5760320 534
kenjiArai 0:5b88d5760320 535 return( 1 );
kenjiArai 0:5b88d5760320 536 }
kenjiArai 0:5b88d5760320 537
kenjiArai 0:5b88d5760320 538 if( verbose != 0 )
kenjiArai 0:5b88d5760320 539 mbedtls_printf( "passed\n" );
kenjiArai 0:5b88d5760320 540 }
kenjiArai 0:5b88d5760320 541
kenjiArai 0:5b88d5760320 542 mbedtls_ccm_free( &ctx );
kenjiArai 0:5b88d5760320 543
kenjiArai 0:5b88d5760320 544 if( verbose != 0 )
kenjiArai 0:5b88d5760320 545 mbedtls_printf( "\n" );
kenjiArai 0:5b88d5760320 546
kenjiArai 0:5b88d5760320 547 return( 0 );
kenjiArai 0:5b88d5760320 548 }
kenjiArai 0:5b88d5760320 549
kenjiArai 0:5b88d5760320 550 #endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
kenjiArai 0:5b88d5760320 551
kenjiArai 0:5b88d5760320 552 #endif /* MBEDTLS_CCM_C */