takashi kadono / Mbed OS Nucleo446_SSD1331

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Dependencies:   ssd1331

mbed-os/features/mbedtls/src/ccm.c@3:f3764f852aa8, 2018-10-11 (annotated)

Committer:
kadonotakashi
Date:
Thu Oct 11 02:27:46 2018 +0000
Revision:
3:f3764f852aa8
Parent:
0:8fdf9a60065b 
Nucreo 446 + SSD1331 test version;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kadonotakashi 0:8fdf9a60065b 1 /*
kadonotakashi 0:8fdf9a60065b 2 * NIST SP800-38C compliant CCM implementation
kadonotakashi 0:8fdf9a60065b 3 *
kadonotakashi 0:8fdf9a60065b 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
kadonotakashi 0:8fdf9a60065b 5 * SPDX-License-Identifier: Apache-2.0
kadonotakashi 0:8fdf9a60065b 6 *
kadonotakashi 0:8fdf9a60065b 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
kadonotakashi 0:8fdf9a60065b 8 * not use this file except in compliance with the License.
kadonotakashi 0:8fdf9a60065b 9 * You may obtain a copy of the License at
kadonotakashi 0:8fdf9a60065b 10 *
kadonotakashi 0:8fdf9a60065b 11 * http://www.apache.org/licenses/LICENSE-2.0
kadonotakashi 0:8fdf9a60065b 12 *
kadonotakashi 0:8fdf9a60065b 13 * Unless required by applicable law or agreed to in writing, software
kadonotakashi 0:8fdf9a60065b 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
kadonotakashi 0:8fdf9a60065b 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
kadonotakashi 0:8fdf9a60065b 16 * See the License for the specific language governing permissions and
kadonotakashi 0:8fdf9a60065b 17 * limitations under the License.
kadonotakashi 0:8fdf9a60065b 18 *
kadonotakashi 0:8fdf9a60065b 19 * This file is part of mbed TLS (https://tls.mbed.org)
kadonotakashi 0:8fdf9a60065b 20 */
kadonotakashi 0:8fdf9a60065b 21
kadonotakashi 0:8fdf9a60065b 22 /*
kadonotakashi 0:8fdf9a60065b 23 * Definition of CCM:
kadonotakashi 0:8fdf9a60065b 24 * http://csrc.nist.gov/publications/nistpubs/800-38C/SP800-38C_updated-July20_2007.pdf
kadonotakashi 0:8fdf9a60065b 25 * RFC 3610 "Counter with CBC-MAC (CCM)"
kadonotakashi 0:8fdf9a60065b 26 *
kadonotakashi 0:8fdf9a60065b 27 * Related:
kadonotakashi 0:8fdf9a60065b 28 * RFC 5116 "An Interface and Algorithms for Authenticated Encryption"
kadonotakashi 0:8fdf9a60065b 29 */
kadonotakashi 0:8fdf9a60065b 30
kadonotakashi 0:8fdf9a60065b 31 #if !defined(MBEDTLS_CONFIG_FILE)
kadonotakashi 0:8fdf9a60065b 32 #include "mbedtls/config.h"
kadonotakashi 0:8fdf9a60065b 33 #else
kadonotakashi 0:8fdf9a60065b 34 #include MBEDTLS_CONFIG_FILE
kadonotakashi 0:8fdf9a60065b 35 #endif
kadonotakashi 0:8fdf9a60065b 36
kadonotakashi 0:8fdf9a60065b 37 #if defined(MBEDTLS_CCM_C)
kadonotakashi 0:8fdf9a60065b 38
kadonotakashi 0:8fdf9a60065b 39 #include "mbedtls/ccm.h"
kadonotakashi 0:8fdf9a60065b 40 #include "mbedtls/platform_util.h"
kadonotakashi 0:8fdf9a60065b 41
kadonotakashi 0:8fdf9a60065b 42 #include <string.h>
kadonotakashi 0:8fdf9a60065b 43
kadonotakashi 0:8fdf9a60065b 44 #if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
kadonotakashi 0:8fdf9a60065b 45 #if defined(MBEDTLS_PLATFORM_C)
kadonotakashi 0:8fdf9a60065b 46 #include "mbedtls/platform.h"
kadonotakashi 0:8fdf9a60065b 47 #else
kadonotakashi 0:8fdf9a60065b 48 #include <stdio.h>
kadonotakashi 0:8fdf9a60065b 49 #define mbedtls_printf printf
kadonotakashi 0:8fdf9a60065b 50 #endif /* MBEDTLS_PLATFORM_C */
kadonotakashi 0:8fdf9a60065b 51 #endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
kadonotakashi 0:8fdf9a60065b 52
kadonotakashi 0:8fdf9a60065b 53 #if !defined(MBEDTLS_CCM_ALT)
kadonotakashi 0:8fdf9a60065b 54
kadonotakashi 0:8fdf9a60065b 55 #define CCM_ENCRYPT 0
kadonotakashi 0:8fdf9a60065b 56 #define CCM_DECRYPT 1
kadonotakashi 0:8fdf9a60065b 57
kadonotakashi 0:8fdf9a60065b 58 /*
kadonotakashi 0:8fdf9a60065b 59 * Initialize context
kadonotakashi 0:8fdf9a60065b 60 */
kadonotakashi 0:8fdf9a60065b 61 void mbedtls_ccm_init( mbedtls_ccm_context *ctx )
kadonotakashi 0:8fdf9a60065b 62 {
kadonotakashi 0:8fdf9a60065b 63 memset( ctx, 0, sizeof( mbedtls_ccm_context ) );
kadonotakashi 0:8fdf9a60065b 64 }
kadonotakashi 0:8fdf9a60065b 65
kadonotakashi 0:8fdf9a60065b 66 int mbedtls_ccm_setkey( mbedtls_ccm_context *ctx,
kadonotakashi 0:8fdf9a60065b 67 mbedtls_cipher_id_t cipher,
kadonotakashi 0:8fdf9a60065b 68 const unsigned char *key,
kadonotakashi 0:8fdf9a60065b 69 unsigned int keybits )
kadonotakashi 0:8fdf9a60065b 70 {
kadonotakashi 0:8fdf9a60065b 71 int ret;
kadonotakashi 0:8fdf9a60065b 72 const mbedtls_cipher_info_t *cipher_info;
kadonotakashi 0:8fdf9a60065b 73
kadonotakashi 0:8fdf9a60065b 74 cipher_info = mbedtls_cipher_info_from_values( cipher, keybits, MBEDTLS_MODE_ECB );
kadonotakashi 0:8fdf9a60065b 75 if( cipher_info == NULL )
kadonotakashi 0:8fdf9a60065b 76 return( MBEDTLS_ERR_CCM_BAD_INPUT );
kadonotakashi 0:8fdf9a60065b 77
kadonotakashi 0:8fdf9a60065b 78 if( cipher_info->block_size != 16 )
kadonotakashi 0:8fdf9a60065b 79 return( MBEDTLS_ERR_CCM_BAD_INPUT );
kadonotakashi 0:8fdf9a60065b 80
kadonotakashi 0:8fdf9a60065b 81 mbedtls_cipher_free( &ctx->cipher_ctx );
kadonotakashi 0:8fdf9a60065b 82
kadonotakashi 0:8fdf9a60065b 83 if( ( ret = mbedtls_cipher_setup( &ctx->cipher_ctx, cipher_info ) ) != 0 )
kadonotakashi 0:8fdf9a60065b 84 return( ret );
kadonotakashi 0:8fdf9a60065b 85
kadonotakashi 0:8fdf9a60065b 86 if( ( ret = mbedtls_cipher_setkey( &ctx->cipher_ctx, key, keybits,
kadonotakashi 0:8fdf9a60065b 87 MBEDTLS_ENCRYPT ) ) != 0 )
kadonotakashi 0:8fdf9a60065b 88 {
kadonotakashi 0:8fdf9a60065b 89 return( ret );
kadonotakashi 0:8fdf9a60065b 90 }
kadonotakashi 0:8fdf9a60065b 91
kadonotakashi 0:8fdf9a60065b 92 return( 0 );
kadonotakashi 0:8fdf9a60065b 93 }
kadonotakashi 0:8fdf9a60065b 94
kadonotakashi 0:8fdf9a60065b 95 /*
kadonotakashi 0:8fdf9a60065b 96 * Free context
kadonotakashi 0:8fdf9a60065b 97 */
kadonotakashi 0:8fdf9a60065b 98 void mbedtls_ccm_free( mbedtls_ccm_context *ctx )
kadonotakashi 0:8fdf9a60065b 99 {
kadonotakashi 0:8fdf9a60065b 100 mbedtls_cipher_free( &ctx->cipher_ctx );
kadonotakashi 0:8fdf9a60065b 101 mbedtls_platform_zeroize( ctx, sizeof( mbedtls_ccm_context ) );
kadonotakashi 0:8fdf9a60065b 102 }
kadonotakashi 0:8fdf9a60065b 103
kadonotakashi 0:8fdf9a60065b 104 /*
kadonotakashi 0:8fdf9a60065b 105 * Macros for common operations.
kadonotakashi 0:8fdf9a60065b 106 * Results in smaller compiled code than static inline functions.
kadonotakashi 0:8fdf9a60065b 107 */
kadonotakashi 0:8fdf9a60065b 108
kadonotakashi 0:8fdf9a60065b 109 /*
kadonotakashi 0:8fdf9a60065b 110 * Update the CBC-MAC state in y using a block in b
kadonotakashi 0:8fdf9a60065b 111 * (Always using b as the source helps the compiler optimise a bit better.)
kadonotakashi 0:8fdf9a60065b 112 */
kadonotakashi 0:8fdf9a60065b 113 #define UPDATE_CBC_MAC \
kadonotakashi 0:8fdf9a60065b 114 for( i = 0; i < 16; i++ ) \
kadonotakashi 0:8fdf9a60065b 115 y[i] ^= b[i]; \
kadonotakashi 0:8fdf9a60065b 116 \
kadonotakashi 0:8fdf9a60065b 117 if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, y, 16, y, &olen ) ) != 0 ) \
kadonotakashi 0:8fdf9a60065b 118 return( ret );
kadonotakashi 0:8fdf9a60065b 119
kadonotakashi 0:8fdf9a60065b 120 /*
kadonotakashi 0:8fdf9a60065b 121 * Encrypt or decrypt a partial block with CTR
kadonotakashi 0:8fdf9a60065b 122 * Warning: using b for temporary storage! src and dst must not be b!
kadonotakashi 0:8fdf9a60065b 123 * This avoids allocating one more 16 bytes buffer while allowing src == dst.
kadonotakashi 0:8fdf9a60065b 124 */
kadonotakashi 0:8fdf9a60065b 125 #define CTR_CRYPT( dst, src, len ) \
kadonotakashi 0:8fdf9a60065b 126 if( ( ret = mbedtls_cipher_update( &ctx->cipher_ctx, ctr, 16, b, &olen ) ) != 0 ) \
kadonotakashi 0:8fdf9a60065b 127 return( ret ); \
kadonotakashi 0:8fdf9a60065b 128 \
kadonotakashi 0:8fdf9a60065b 129 for( i = 0; i < len; i++ ) \
kadonotakashi 0:8fdf9a60065b 130 dst[i] = src[i] ^ b[i];
kadonotakashi 0:8fdf9a60065b 131
kadonotakashi 0:8fdf9a60065b 132 /*
kadonotakashi 0:8fdf9a60065b 133 * Authenticated encryption or decryption
kadonotakashi 0:8fdf9a60065b 134 */
kadonotakashi 0:8fdf9a60065b 135 static int ccm_auth_crypt( mbedtls_ccm_context *ctx, int mode, size_t length,
kadonotakashi 0:8fdf9a60065b 136 const unsigned char *iv, size_t iv_len,
kadonotakashi 0:8fdf9a60065b 137 const unsigned char *add, size_t add_len,
kadonotakashi 0:8fdf9a60065b 138 const unsigned char *input, unsigned char *output,
kadonotakashi 0:8fdf9a60065b 139 unsigned char *tag, size_t tag_len )
kadonotakashi 0:8fdf9a60065b 140 {
kadonotakashi 0:8fdf9a60065b 141 int ret;
kadonotakashi 0:8fdf9a60065b 142 unsigned char i;
kadonotakashi 0:8fdf9a60065b 143 unsigned char q;
kadonotakashi 0:8fdf9a60065b 144 size_t len_left, olen;
kadonotakashi 0:8fdf9a60065b 145 unsigned char b[16];
kadonotakashi 0:8fdf9a60065b 146 unsigned char y[16];
kadonotakashi 0:8fdf9a60065b 147 unsigned char ctr[16];
kadonotakashi 0:8fdf9a60065b 148 const unsigned char *src;
kadonotakashi 0:8fdf9a60065b 149 unsigned char *dst;
kadonotakashi 0:8fdf9a60065b 150
kadonotakashi 0:8fdf9a60065b 151 /*
kadonotakashi 0:8fdf9a60065b 152 * Check length requirements: SP800-38C A.1
kadonotakashi 0:8fdf9a60065b 153 * Additional requirement: a < 2^16 - 2^8 to simplify the code.
kadonotakashi 0:8fdf9a60065b 154 * 'length' checked later (when writing it to the first block)
kadonotakashi 0:8fdf9a60065b 155 *
kadonotakashi 0:8fdf9a60065b 156 * Also, loosen the requirements to enable support for CCM* (IEEE 802.15.4).
kadonotakashi 0:8fdf9a60065b 157 */
kadonotakashi 0:8fdf9a60065b 158 if( tag_len == 2 || tag_len > 16 || tag_len % 2 != 0 )
kadonotakashi 0:8fdf9a60065b 159 return( MBEDTLS_ERR_CCM_BAD_INPUT );
kadonotakashi 0:8fdf9a60065b 160
kadonotakashi 0:8fdf9a60065b 161 /* Also implies q is within bounds */
kadonotakashi 0:8fdf9a60065b 162 if( iv_len < 7 || iv_len > 13 )
kadonotakashi 0:8fdf9a60065b 163 return( MBEDTLS_ERR_CCM_BAD_INPUT );
kadonotakashi 0:8fdf9a60065b 164
kadonotakashi 0:8fdf9a60065b 165 if( add_len > 0xFF00 )
kadonotakashi 0:8fdf9a60065b 166 return( MBEDTLS_ERR_CCM_BAD_INPUT );
kadonotakashi 0:8fdf9a60065b 167
kadonotakashi 0:8fdf9a60065b 168 q = 16 - 1 - (unsigned char) iv_len;
kadonotakashi 0:8fdf9a60065b 169
kadonotakashi 0:8fdf9a60065b 170 /*
kadonotakashi 0:8fdf9a60065b 171 * First block B_0:
kadonotakashi 0:8fdf9a60065b 172 * 0 .. 0 flags
kadonotakashi 0:8fdf9a60065b 173 * 1 .. iv_len nonce (aka iv)
kadonotakashi 0:8fdf9a60065b 174 * iv_len+1 .. 15 length
kadonotakashi 0:8fdf9a60065b 175 *
kadonotakashi 0:8fdf9a60065b 176 * With flags as (bits):
kadonotakashi 0:8fdf9a60065b 177 * 7 0
kadonotakashi 0:8fdf9a60065b 178 * 6 add present?
kadonotakashi 0:8fdf9a60065b 179 * 5 .. 3 (t - 2) / 2
kadonotakashi 0:8fdf9a60065b 180 * 2 .. 0 q - 1
kadonotakashi 0:8fdf9a60065b 181 */
kadonotakashi 0:8fdf9a60065b 182 b[0] = 0;
kadonotakashi 0:8fdf9a60065b 183 b[0] |= ( add_len > 0 ) << 6;
kadonotakashi 0:8fdf9a60065b 184 b[0] |= ( ( tag_len - 2 ) / 2 ) << 3;
kadonotakashi 0:8fdf9a60065b 185 b[0] |= q - 1;
kadonotakashi 0:8fdf9a60065b 186
kadonotakashi 0:8fdf9a60065b 187 memcpy( b + 1, iv, iv_len );
kadonotakashi 0:8fdf9a60065b 188
kadonotakashi 0:8fdf9a60065b 189 for( i = 0, len_left = length; i < q; i++, len_left >>= 8 )
kadonotakashi 0:8fdf9a60065b 190 b[15-i] = (unsigned char)( len_left & 0xFF );
kadonotakashi 0:8fdf9a60065b 191
kadonotakashi 0:8fdf9a60065b 192 if( len_left > 0 )
kadonotakashi 0:8fdf9a60065b 193 return( MBEDTLS_ERR_CCM_BAD_INPUT );
kadonotakashi 0:8fdf9a60065b 194
kadonotakashi 0:8fdf9a60065b 195
kadonotakashi 0:8fdf9a60065b 196 /* Start CBC-MAC with first block */
kadonotakashi 0:8fdf9a60065b 197 memset( y, 0, 16 );
kadonotakashi 0:8fdf9a60065b 198 UPDATE_CBC_MAC;
kadonotakashi 0:8fdf9a60065b 199
kadonotakashi 0:8fdf9a60065b 200 /*
kadonotakashi 0:8fdf9a60065b 201 * If there is additional data, update CBC-MAC with
kadonotakashi 0:8fdf9a60065b 202 * add_len, add, 0 (padding to a block boundary)
kadonotakashi 0:8fdf9a60065b 203 */
kadonotakashi 0:8fdf9a60065b 204 if( add_len > 0 )
kadonotakashi 0:8fdf9a60065b 205 {
kadonotakashi 0:8fdf9a60065b 206 size_t use_len;
kadonotakashi 0:8fdf9a60065b 207 len_left = add_len;
kadonotakashi 0:8fdf9a60065b 208 src = add;
kadonotakashi 0:8fdf9a60065b 209
kadonotakashi 0:8fdf9a60065b 210 memset( b, 0, 16 );
kadonotakashi 0:8fdf9a60065b 211 b[0] = (unsigned char)( ( add_len >> 8 ) & 0xFF );
kadonotakashi 0:8fdf9a60065b 212 b[1] = (unsigned char)( ( add_len ) & 0xFF );
kadonotakashi 0:8fdf9a60065b 213
kadonotakashi 0:8fdf9a60065b 214 use_len = len_left < 16 - 2 ? len_left : 16 - 2;
kadonotakashi 0:8fdf9a60065b 215 memcpy( b + 2, src, use_len );
kadonotakashi 0:8fdf9a60065b 216 len_left -= use_len;
kadonotakashi 0:8fdf9a60065b 217 src += use_len;
kadonotakashi 0:8fdf9a60065b 218
kadonotakashi 0:8fdf9a60065b 219 UPDATE_CBC_MAC;
kadonotakashi 0:8fdf9a60065b 220
kadonotakashi 0:8fdf9a60065b 221 while( len_left > 0 )
kadonotakashi 0:8fdf9a60065b 222 {
kadonotakashi 0:8fdf9a60065b 223 use_len = len_left > 16 ? 16 : len_left;
kadonotakashi 0:8fdf9a60065b 224
kadonotakashi 0:8fdf9a60065b 225 memset( b, 0, 16 );
kadonotakashi 0:8fdf9a60065b 226 memcpy( b, src, use_len );
kadonotakashi 0:8fdf9a60065b 227 UPDATE_CBC_MAC;
kadonotakashi 0:8fdf9a60065b 228
kadonotakashi 0:8fdf9a60065b 229 len_left -= use_len;
kadonotakashi 0:8fdf9a60065b 230 src += use_len;
kadonotakashi 0:8fdf9a60065b 231 }
kadonotakashi 0:8fdf9a60065b 232 }
kadonotakashi 0:8fdf9a60065b 233
kadonotakashi 0:8fdf9a60065b 234 /*
kadonotakashi 0:8fdf9a60065b 235 * Prepare counter block for encryption:
kadonotakashi 0:8fdf9a60065b 236 * 0 .. 0 flags
kadonotakashi 0:8fdf9a60065b 237 * 1 .. iv_len nonce (aka iv)
kadonotakashi 0:8fdf9a60065b 238 * iv_len+1 .. 15 counter (initially 1)
kadonotakashi 0:8fdf9a60065b 239 *
kadonotakashi 0:8fdf9a60065b 240 * With flags as (bits):
kadonotakashi 0:8fdf9a60065b 241 * 7 .. 3 0
kadonotakashi 0:8fdf9a60065b 242 * 2 .. 0 q - 1
kadonotakashi 0:8fdf9a60065b 243 */
kadonotakashi 0:8fdf9a60065b 244 ctr[0] = q - 1;
kadonotakashi 0:8fdf9a60065b 245 memcpy( ctr + 1, iv, iv_len );
kadonotakashi 0:8fdf9a60065b 246 memset( ctr + 1 + iv_len, 0, q );
kadonotakashi 0:8fdf9a60065b 247 ctr[15] = 1;
kadonotakashi 0:8fdf9a60065b 248
kadonotakashi 0:8fdf9a60065b 249 /*
kadonotakashi 0:8fdf9a60065b 250 * Authenticate and {en,de}crypt the message.
kadonotakashi 0:8fdf9a60065b 251 *
kadonotakashi 0:8fdf9a60065b 252 * The only difference between encryption and decryption is
kadonotakashi 0:8fdf9a60065b 253 * the respective order of authentication and {en,de}cryption.
kadonotakashi 0:8fdf9a60065b 254 */
kadonotakashi 0:8fdf9a60065b 255 len_left = length;
kadonotakashi 0:8fdf9a60065b 256 src = input;
kadonotakashi 0:8fdf9a60065b 257 dst = output;
kadonotakashi 0:8fdf9a60065b 258
kadonotakashi 0:8fdf9a60065b 259 while( len_left > 0 )
kadonotakashi 0:8fdf9a60065b 260 {
kadonotakashi 0:8fdf9a60065b 261 size_t use_len = len_left > 16 ? 16 : len_left;
kadonotakashi 0:8fdf9a60065b 262
kadonotakashi 0:8fdf9a60065b 263 if( mode == CCM_ENCRYPT )
kadonotakashi 0:8fdf9a60065b 264 {
kadonotakashi 0:8fdf9a60065b 265 memset( b, 0, 16 );
kadonotakashi 0:8fdf9a60065b 266 memcpy( b, src, use_len );
kadonotakashi 0:8fdf9a60065b 267 UPDATE_CBC_MAC;
kadonotakashi 0:8fdf9a60065b 268 }
kadonotakashi 0:8fdf9a60065b 269
kadonotakashi 0:8fdf9a60065b 270 CTR_CRYPT( dst, src, use_len );
kadonotakashi 0:8fdf9a60065b 271
kadonotakashi 0:8fdf9a60065b 272 if( mode == CCM_DECRYPT )
kadonotakashi 0:8fdf9a60065b 273 {
kadonotakashi 0:8fdf9a60065b 274 memset( b, 0, 16 );
kadonotakashi 0:8fdf9a60065b 275 memcpy( b, dst, use_len );
kadonotakashi 0:8fdf9a60065b 276 UPDATE_CBC_MAC;
kadonotakashi 0:8fdf9a60065b 277 }
kadonotakashi 0:8fdf9a60065b 278
kadonotakashi 0:8fdf9a60065b 279 dst += use_len;
kadonotakashi 0:8fdf9a60065b 280 src += use_len;
kadonotakashi 0:8fdf9a60065b 281 len_left -= use_len;
kadonotakashi 0:8fdf9a60065b 282
kadonotakashi 0:8fdf9a60065b 283 /*
kadonotakashi 0:8fdf9a60065b 284 * Increment counter.
kadonotakashi 0:8fdf9a60065b 285 * No need to check for overflow thanks to the length check above.
kadonotakashi 0:8fdf9a60065b 286 */
kadonotakashi 0:8fdf9a60065b 287 for( i = 0; i < q; i++ )
kadonotakashi 0:8fdf9a60065b 288 if( ++ctr[15-i] != 0 )
kadonotakashi 0:8fdf9a60065b 289 break;
kadonotakashi 0:8fdf9a60065b 290 }
kadonotakashi 0:8fdf9a60065b 291
kadonotakashi 0:8fdf9a60065b 292 /*
kadonotakashi 0:8fdf9a60065b 293 * Authentication: reset counter and crypt/mask internal tag
kadonotakashi 0:8fdf9a60065b 294 */
kadonotakashi 0:8fdf9a60065b 295 for( i = 0; i < q; i++ )
kadonotakashi 0:8fdf9a60065b 296 ctr[15-i] = 0;
kadonotakashi 0:8fdf9a60065b 297
kadonotakashi 0:8fdf9a60065b 298 CTR_CRYPT( y, y, 16 );
kadonotakashi 0:8fdf9a60065b 299 memcpy( tag, y, tag_len );
kadonotakashi 0:8fdf9a60065b 300
kadonotakashi 0:8fdf9a60065b 301 return( 0 );
kadonotakashi 0:8fdf9a60065b 302 }
kadonotakashi 0:8fdf9a60065b 303
kadonotakashi 0:8fdf9a60065b 304 /*
kadonotakashi 0:8fdf9a60065b 305 * Authenticated encryption
kadonotakashi 0:8fdf9a60065b 306 */
kadonotakashi 0:8fdf9a60065b 307 int mbedtls_ccm_star_encrypt_and_tag( mbedtls_ccm_context *ctx, size_t length,
kadonotakashi 0:8fdf9a60065b 308 const unsigned char *iv, size_t iv_len,
kadonotakashi 0:8fdf9a60065b 309 const unsigned char *add, size_t add_len,
kadonotakashi 0:8fdf9a60065b 310 const unsigned char *input, unsigned char *output,
kadonotakashi 0:8fdf9a60065b 311 unsigned char *tag, size_t tag_len )
kadonotakashi 0:8fdf9a60065b 312 {
kadonotakashi 0:8fdf9a60065b 313 return( ccm_auth_crypt( ctx, CCM_ENCRYPT, length, iv, iv_len,
kadonotakashi 0:8fdf9a60065b 314 add, add_len, input, output, tag, tag_len ) );
kadonotakashi 0:8fdf9a60065b 315 }
kadonotakashi 0:8fdf9a60065b 316
kadonotakashi 0:8fdf9a60065b 317 int mbedtls_ccm_encrypt_and_tag( mbedtls_ccm_context *ctx, size_t length,
kadonotakashi 0:8fdf9a60065b 318 const unsigned char *iv, size_t iv_len,
kadonotakashi 0:8fdf9a60065b 319 const unsigned char *add, size_t add_len,
kadonotakashi 0:8fdf9a60065b 320 const unsigned char *input, unsigned char *output,
kadonotakashi 0:8fdf9a60065b 321 unsigned char *tag, size_t tag_len )
kadonotakashi 0:8fdf9a60065b 322 {
kadonotakashi 0:8fdf9a60065b 323 if( tag_len == 0 )
kadonotakashi 0:8fdf9a60065b 324 return( MBEDTLS_ERR_CCM_BAD_INPUT );
kadonotakashi 0:8fdf9a60065b 325
kadonotakashi 0:8fdf9a60065b 326 return( mbedtls_ccm_star_encrypt_and_tag( ctx, length, iv, iv_len, add,
kadonotakashi 0:8fdf9a60065b 327 add_len, input, output, tag, tag_len ) );
kadonotakashi 0:8fdf9a60065b 328 }
kadonotakashi 0:8fdf9a60065b 329
kadonotakashi 0:8fdf9a60065b 330 /*
kadonotakashi 0:8fdf9a60065b 331 * Authenticated decryption
kadonotakashi 0:8fdf9a60065b 332 */
kadonotakashi 0:8fdf9a60065b 333 int mbedtls_ccm_star_auth_decrypt( mbedtls_ccm_context *ctx, size_t length,
kadonotakashi 0:8fdf9a60065b 334 const unsigned char *iv, size_t iv_len,
kadonotakashi 0:8fdf9a60065b 335 const unsigned char *add, size_t add_len,
kadonotakashi 0:8fdf9a60065b 336 const unsigned char *input, unsigned char *output,
kadonotakashi 0:8fdf9a60065b 337 const unsigned char *tag, size_t tag_len )
kadonotakashi 0:8fdf9a60065b 338 {
kadonotakashi 0:8fdf9a60065b 339 int ret;
kadonotakashi 0:8fdf9a60065b 340 unsigned char check_tag[16];
kadonotakashi 0:8fdf9a60065b 341 unsigned char i;
kadonotakashi 0:8fdf9a60065b 342 int diff;
kadonotakashi 0:8fdf9a60065b 343
kadonotakashi 0:8fdf9a60065b 344 if( ( ret = ccm_auth_crypt( ctx, CCM_DECRYPT, length,
kadonotakashi 0:8fdf9a60065b 345 iv, iv_len, add, add_len,
kadonotakashi 0:8fdf9a60065b 346 input, output, check_tag, tag_len ) ) != 0 )
kadonotakashi 0:8fdf9a60065b 347 {
kadonotakashi 0:8fdf9a60065b 348 return( ret );
kadonotakashi 0:8fdf9a60065b 349 }
kadonotakashi 0:8fdf9a60065b 350
kadonotakashi 0:8fdf9a60065b 351 /* Check tag in "constant-time" */
kadonotakashi 0:8fdf9a60065b 352 for( diff = 0, i = 0; i < tag_len; i++ )
kadonotakashi 0:8fdf9a60065b 353 diff |= tag[i] ^ check_tag[i];
kadonotakashi 0:8fdf9a60065b 354
kadonotakashi 0:8fdf9a60065b 355 if( diff != 0 )
kadonotakashi 0:8fdf9a60065b 356 {
kadonotakashi 0:8fdf9a60065b 357 mbedtls_platform_zeroize( output, length );
kadonotakashi 0:8fdf9a60065b 358 return( MBEDTLS_ERR_CCM_AUTH_FAILED );
kadonotakashi 0:8fdf9a60065b 359 }
kadonotakashi 0:8fdf9a60065b 360
kadonotakashi 0:8fdf9a60065b 361 return( 0 );
kadonotakashi 0:8fdf9a60065b 362 }
kadonotakashi 0:8fdf9a60065b 363
kadonotakashi 0:8fdf9a60065b 364 int mbedtls_ccm_auth_decrypt( mbedtls_ccm_context *ctx, size_t length,
kadonotakashi 0:8fdf9a60065b 365 const unsigned char *iv, size_t iv_len,
kadonotakashi 0:8fdf9a60065b 366 const unsigned char *add, size_t add_len,
kadonotakashi 0:8fdf9a60065b 367 const unsigned char *input, unsigned char *output,
kadonotakashi 0:8fdf9a60065b 368 const unsigned char *tag, size_t tag_len )
kadonotakashi 0:8fdf9a60065b 369 {
kadonotakashi 0:8fdf9a60065b 370 if( tag_len == 0 )
kadonotakashi 0:8fdf9a60065b 371 return( MBEDTLS_ERR_CCM_BAD_INPUT );
kadonotakashi 0:8fdf9a60065b 372
kadonotakashi 0:8fdf9a60065b 373 return( mbedtls_ccm_star_auth_decrypt( ctx, length, iv, iv_len, add,
kadonotakashi 0:8fdf9a60065b 374 add_len, input, output, tag, tag_len ) );
kadonotakashi 0:8fdf9a60065b 375 }
kadonotakashi 0:8fdf9a60065b 376 #endif /* !MBEDTLS_CCM_ALT */
kadonotakashi 0:8fdf9a60065b 377
kadonotakashi 0:8fdf9a60065b 378 #if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_AES_C)
kadonotakashi 0:8fdf9a60065b 379 /*
kadonotakashi 0:8fdf9a60065b 380 * Examples 1 to 3 from SP800-38C Appendix C
kadonotakashi 0:8fdf9a60065b 381 */
kadonotakashi 0:8fdf9a60065b 382
kadonotakashi 0:8fdf9a60065b 383 #define NB_TESTS 3
kadonotakashi 0:8fdf9a60065b 384 #define CCM_SELFTEST_PT_MAX_LEN 24
kadonotakashi 0:8fdf9a60065b 385 #define CCM_SELFTEST_CT_MAX_LEN 32
kadonotakashi 0:8fdf9a60065b 386 /*
kadonotakashi 0:8fdf9a60065b 387 * The data is the same for all tests, only the used length changes
kadonotakashi 0:8fdf9a60065b 388 */
kadonotakashi 0:8fdf9a60065b 389 static const unsigned char key[] = {
kadonotakashi 0:8fdf9a60065b 390 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
kadonotakashi 0:8fdf9a60065b 391 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f
kadonotakashi 0:8fdf9a60065b 392 };
kadonotakashi 0:8fdf9a60065b 393
kadonotakashi 0:8fdf9a60065b 394 static const unsigned char iv[] = {
kadonotakashi 0:8fdf9a60065b 395 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
kadonotakashi 0:8fdf9a60065b 396 0x18, 0x19, 0x1a, 0x1b
kadonotakashi 0:8fdf9a60065b 397 };
kadonotakashi 0:8fdf9a60065b 398
kadonotakashi 0:8fdf9a60065b 399 static const unsigned char ad[] = {
kadonotakashi 0:8fdf9a60065b 400 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
kadonotakashi 0:8fdf9a60065b 401 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
kadonotakashi 0:8fdf9a60065b 402 0x10, 0x11, 0x12, 0x13
kadonotakashi 0:8fdf9a60065b 403 };
kadonotakashi 0:8fdf9a60065b 404
kadonotakashi 0:8fdf9a60065b 405 static const unsigned char msg[CCM_SELFTEST_PT_MAX_LEN] = {
kadonotakashi 0:8fdf9a60065b 406 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
kadonotakashi 0:8fdf9a60065b 407 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
kadonotakashi 0:8fdf9a60065b 408 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
kadonotakashi 0:8fdf9a60065b 409 };
kadonotakashi 0:8fdf9a60065b 410
kadonotakashi 0:8fdf9a60065b 411 static const size_t iv_len [NB_TESTS] = { 7, 8, 12 };
kadonotakashi 0:8fdf9a60065b 412 static const size_t add_len[NB_TESTS] = { 8, 16, 20 };
kadonotakashi 0:8fdf9a60065b 413 static const size_t msg_len[NB_TESTS] = { 4, 16, 24 };
kadonotakashi 0:8fdf9a60065b 414 static const size_t tag_len[NB_TESTS] = { 4, 6, 8 };
kadonotakashi 0:8fdf9a60065b 415
kadonotakashi 0:8fdf9a60065b 416 static const unsigned char res[NB_TESTS][CCM_SELFTEST_CT_MAX_LEN] = {
kadonotakashi 0:8fdf9a60065b 417 { 0x71, 0x62, 0x01, 0x5b, 0x4d, 0xac, 0x25, 0x5d },
kadonotakashi 0:8fdf9a60065b 418 { 0xd2, 0xa1, 0xf0, 0xe0, 0x51, 0xea, 0x5f, 0x62,
kadonotakashi 0:8fdf9a60065b 419 0x08, 0x1a, 0x77, 0x92, 0x07, 0x3d, 0x59, 0x3d,
kadonotakashi 0:8fdf9a60065b 420 0x1f, 0xc6, 0x4f, 0xbf, 0xac, 0xcd },
kadonotakashi 0:8fdf9a60065b 421 { 0xe3, 0xb2, 0x01, 0xa9, 0xf5, 0xb7, 0x1a, 0x7a,
kadonotakashi 0:8fdf9a60065b 422 0x9b, 0x1c, 0xea, 0xec, 0xcd, 0x97, 0xe7, 0x0b,
kadonotakashi 0:8fdf9a60065b 423 0x61, 0x76, 0xaa, 0xd9, 0xa4, 0x42, 0x8a, 0xa5,
kadonotakashi 0:8fdf9a60065b 424 0x48, 0x43, 0x92, 0xfb, 0xc1, 0xb0, 0x99, 0x51 }
kadonotakashi 0:8fdf9a60065b 425 };
kadonotakashi 0:8fdf9a60065b 426
kadonotakashi 0:8fdf9a60065b 427 int mbedtls_ccm_self_test( int verbose )
kadonotakashi 0:8fdf9a60065b 428 {
kadonotakashi 0:8fdf9a60065b 429 mbedtls_ccm_context ctx;
kadonotakashi 0:8fdf9a60065b 430 /*
kadonotakashi 0:8fdf9a60065b 431 * Some hardware accelerators require the input and output buffers
kadonotakashi 0:8fdf9a60065b 432 * would be in RAM, because the flash is not accessible.
kadonotakashi 0:8fdf9a60065b 433 * Use buffers on the stack to hold the test vectors data.
kadonotakashi 0:8fdf9a60065b 434 */
kadonotakashi 0:8fdf9a60065b 435 unsigned char plaintext[CCM_SELFTEST_PT_MAX_LEN];
kadonotakashi 0:8fdf9a60065b 436 unsigned char ciphertext[CCM_SELFTEST_CT_MAX_LEN];
kadonotakashi 0:8fdf9a60065b 437 size_t i;
kadonotakashi 0:8fdf9a60065b 438 int ret;
kadonotakashi 0:8fdf9a60065b 439
kadonotakashi 0:8fdf9a60065b 440 mbedtls_ccm_init( &ctx );
kadonotakashi 0:8fdf9a60065b 441
kadonotakashi 0:8fdf9a60065b 442 if( mbedtls_ccm_setkey( &ctx, MBEDTLS_CIPHER_ID_AES, key, 8 * sizeof key ) != 0 )
kadonotakashi 0:8fdf9a60065b 443 {
kadonotakashi 0:8fdf9a60065b 444 if( verbose != 0 )
kadonotakashi 0:8fdf9a60065b 445 mbedtls_printf( " CCM: setup failed" );
kadonotakashi 0:8fdf9a60065b 446
kadonotakashi 0:8fdf9a60065b 447 return( 1 );
kadonotakashi 0:8fdf9a60065b 448 }
kadonotakashi 0:8fdf9a60065b 449
kadonotakashi 0:8fdf9a60065b 450 for( i = 0; i < NB_TESTS; i++ )
kadonotakashi 0:8fdf9a60065b 451 {
kadonotakashi 0:8fdf9a60065b 452 if( verbose != 0 )
kadonotakashi 0:8fdf9a60065b 453 mbedtls_printf( " CCM-AES #%u: ", (unsigned int) i + 1 );
kadonotakashi 0:8fdf9a60065b 454
kadonotakashi 0:8fdf9a60065b 455 memset( plaintext, 0, CCM_SELFTEST_PT_MAX_LEN );
kadonotakashi 0:8fdf9a60065b 456 memset( ciphertext, 0, CCM_SELFTEST_CT_MAX_LEN );
kadonotakashi 0:8fdf9a60065b 457 memcpy( plaintext, msg, msg_len[i] );
kadonotakashi 0:8fdf9a60065b 458
kadonotakashi 0:8fdf9a60065b 459 ret = mbedtls_ccm_encrypt_and_tag( &ctx, msg_len[i],
kadonotakashi 0:8fdf9a60065b 460 iv, iv_len[i], ad, add_len[i],
kadonotakashi 0:8fdf9a60065b 461 plaintext, ciphertext,
kadonotakashi 0:8fdf9a60065b 462 ciphertext + msg_len[i], tag_len[i] );
kadonotakashi 0:8fdf9a60065b 463
kadonotakashi 0:8fdf9a60065b 464 if( ret != 0 ||
kadonotakashi 0:8fdf9a60065b 465 memcmp( ciphertext, res[i], msg_len[i] + tag_len[i] ) != 0 )
kadonotakashi 0:8fdf9a60065b 466 {
kadonotakashi 0:8fdf9a60065b 467 if( verbose != 0 )
kadonotakashi 0:8fdf9a60065b 468 mbedtls_printf( "failed\n" );
kadonotakashi 0:8fdf9a60065b 469
kadonotakashi 0:8fdf9a60065b 470 return( 1 );
kadonotakashi 0:8fdf9a60065b 471 }
kadonotakashi 0:8fdf9a60065b 472 memset( plaintext, 0, CCM_SELFTEST_PT_MAX_LEN );
kadonotakashi 0:8fdf9a60065b 473
kadonotakashi 0:8fdf9a60065b 474 ret = mbedtls_ccm_auth_decrypt( &ctx, msg_len[i],
kadonotakashi 0:8fdf9a60065b 475 iv, iv_len[i], ad, add_len[i],
kadonotakashi 0:8fdf9a60065b 476 ciphertext, plaintext,
kadonotakashi 0:8fdf9a60065b 477 ciphertext + msg_len[i], tag_len[i] );
kadonotakashi 0:8fdf9a60065b 478
kadonotakashi 0:8fdf9a60065b 479 if( ret != 0 ||
kadonotakashi 0:8fdf9a60065b 480 memcmp( plaintext, msg, msg_len[i] ) != 0 )
kadonotakashi 0:8fdf9a60065b 481 {
kadonotakashi 0:8fdf9a60065b 482 if( verbose != 0 )
kadonotakashi 0:8fdf9a60065b 483 mbedtls_printf( "failed\n" );
kadonotakashi 0:8fdf9a60065b 484
kadonotakashi 0:8fdf9a60065b 485 return( 1 );
kadonotakashi 0:8fdf9a60065b 486 }
kadonotakashi 0:8fdf9a60065b 487
kadonotakashi 0:8fdf9a60065b 488 if( verbose != 0 )
kadonotakashi 0:8fdf9a60065b 489 mbedtls_printf( "passed\n" );
kadonotakashi 0:8fdf9a60065b 490 }
kadonotakashi 0:8fdf9a60065b 491
kadonotakashi 0:8fdf9a60065b 492 mbedtls_ccm_free( &ctx );
kadonotakashi 0:8fdf9a60065b 493
kadonotakashi 0:8fdf9a60065b 494 if( verbose != 0 )
kadonotakashi 0:8fdf9a60065b 495 mbedtls_printf( "\n" );
kadonotakashi 0:8fdf9a60065b 496
kadonotakashi 0:8fdf9a60065b 497 return( 0 );
kadonotakashi 0:8fdf9a60065b 498 }
kadonotakashi 0:8fdf9a60065b 499
kadonotakashi 0:8fdf9a60065b 500 #endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
kadonotakashi 0:8fdf9a60065b 501
kadonotakashi 0:8fdf9a60065b 502 #endif /* MBEDTLS_CCM_C */