Kev Mann / mbed-dev-OS5_10_4

RTC auf true

features/mbedtls/src/xtea.c@2:7aab896b1a3b, 2019-03-13 (annotated)

Committer:
kevman
Date:
Wed Mar 13 11:03:24 2019 +0000
Revision:
2:7aab896b1a3b
Parent:
0:38ceb79fef03 
2019-03-13

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kevman 0:38ceb79fef03 1 /*
kevman 0:38ceb79fef03 2 * An 32-bit implementation of the XTEA algorithm
kevman 0:38ceb79fef03 3 *
kevman 0:38ceb79fef03 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
kevman 0:38ceb79fef03 5 * SPDX-License-Identifier: Apache-2.0
kevman 0:38ceb79fef03 6 *
kevman 0:38ceb79fef03 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
kevman 0:38ceb79fef03 8 * not use this file except in compliance with the License.
kevman 0:38ceb79fef03 9 * You may obtain a copy of the License at
kevman 0:38ceb79fef03 10 *
kevman 0:38ceb79fef03 11 * http://www.apache.org/licenses/LICENSE-2.0
kevman 0:38ceb79fef03 12 *
kevman 0:38ceb79fef03 13 * Unless required by applicable law or agreed to in writing, software
kevman 0:38ceb79fef03 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
kevman 0:38ceb79fef03 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
kevman 0:38ceb79fef03 16 * See the License for the specific language governing permissions and
kevman 0:38ceb79fef03 17 * limitations under the License.
kevman 0:38ceb79fef03 18 *
kevman 0:38ceb79fef03 19 * This file is part of mbed TLS (https://tls.mbed.org)
kevman 0:38ceb79fef03 20 */
kevman 0:38ceb79fef03 21
kevman 0:38ceb79fef03 22 #if !defined(MBEDTLS_CONFIG_FILE)
kevman 0:38ceb79fef03 23 #include "mbedtls/config.h"
kevman 0:38ceb79fef03 24 #else
kevman 0:38ceb79fef03 25 #include MBEDTLS_CONFIG_FILE
kevman 0:38ceb79fef03 26 #endif
kevman 0:38ceb79fef03 27
kevman 0:38ceb79fef03 28 #if defined(MBEDTLS_XTEA_C)
kevman 0:38ceb79fef03 29
kevman 0:38ceb79fef03 30 #include "mbedtls/xtea.h"
kevman 0:38ceb79fef03 31 #include "mbedtls/platform_util.h"
kevman 0:38ceb79fef03 32
kevman 0:38ceb79fef03 33 #include <string.h>
kevman 0:38ceb79fef03 34
kevman 0:38ceb79fef03 35 #if defined(MBEDTLS_SELF_TEST)
kevman 0:38ceb79fef03 36 #if defined(MBEDTLS_PLATFORM_C)
kevman 0:38ceb79fef03 37 #include "mbedtls/platform.h"
kevman 0:38ceb79fef03 38 #else
kevman 0:38ceb79fef03 39 #include <stdio.h>
kevman 0:38ceb79fef03 40 #define mbedtls_printf printf
kevman 0:38ceb79fef03 41 #endif /* MBEDTLS_PLATFORM_C */
kevman 0:38ceb79fef03 42 #endif /* MBEDTLS_SELF_TEST */
kevman 0:38ceb79fef03 43
kevman 0:38ceb79fef03 44 #if !defined(MBEDTLS_XTEA_ALT)
kevman 0:38ceb79fef03 45
kevman 0:38ceb79fef03 46 /*
kevman 0:38ceb79fef03 47 * 32-bit integer manipulation macros (big endian)
kevman 0:38ceb79fef03 48 */
kevman 0:38ceb79fef03 49 #ifndef GET_UINT32_BE
kevman 0:38ceb79fef03 50 #define GET_UINT32_BE(n,b,i) \
kevman 0:38ceb79fef03 51 { \
kevman 0:38ceb79fef03 52 (n) = ( (uint32_t) (b)[(i) ] << 24 ) \
kevman 0:38ceb79fef03 53 | ( (uint32_t) (b)[(i) + 1] << 16 ) \
kevman 0:38ceb79fef03 54 | ( (uint32_t) (b)[(i) + 2] << 8 ) \
kevman 0:38ceb79fef03 55 | ( (uint32_t) (b)[(i) + 3] ); \
kevman 0:38ceb79fef03 56 }
kevman 0:38ceb79fef03 57 #endif
kevman 0:38ceb79fef03 58
kevman 0:38ceb79fef03 59 #ifndef PUT_UINT32_BE
kevman 0:38ceb79fef03 60 #define PUT_UINT32_BE(n,b,i) \
kevman 0:38ceb79fef03 61 { \
kevman 0:38ceb79fef03 62 (b)[(i) ] = (unsigned char) ( (n) >> 24 ); \
kevman 0:38ceb79fef03 63 (b)[(i) + 1] = (unsigned char) ( (n) >> 16 ); \
kevman 0:38ceb79fef03 64 (b)[(i) + 2] = (unsigned char) ( (n) >> 8 ); \
kevman 0:38ceb79fef03 65 (b)[(i) + 3] = (unsigned char) ( (n) ); \
kevman 0:38ceb79fef03 66 }
kevman 0:38ceb79fef03 67 #endif
kevman 0:38ceb79fef03 68
kevman 0:38ceb79fef03 69 void mbedtls_xtea_init( mbedtls_xtea_context *ctx )
kevman 0:38ceb79fef03 70 {
kevman 0:38ceb79fef03 71 memset( ctx, 0, sizeof( mbedtls_xtea_context ) );
kevman 0:38ceb79fef03 72 }
kevman 0:38ceb79fef03 73
kevman 0:38ceb79fef03 74 void mbedtls_xtea_free( mbedtls_xtea_context *ctx )
kevman 0:38ceb79fef03 75 {
kevman 0:38ceb79fef03 76 if( ctx == NULL )
kevman 0:38ceb79fef03 77 return;
kevman 0:38ceb79fef03 78
kevman 0:38ceb79fef03 79 mbedtls_platform_zeroize( ctx, sizeof( mbedtls_xtea_context ) );
kevman 0:38ceb79fef03 80 }
kevman 0:38ceb79fef03 81
kevman 0:38ceb79fef03 82 /*
kevman 0:38ceb79fef03 83 * XTEA key schedule
kevman 0:38ceb79fef03 84 */
kevman 0:38ceb79fef03 85 void mbedtls_xtea_setup( mbedtls_xtea_context *ctx, const unsigned char key[16] )
kevman 0:38ceb79fef03 86 {
kevman 0:38ceb79fef03 87 int i;
kevman 0:38ceb79fef03 88
kevman 0:38ceb79fef03 89 memset( ctx, 0, sizeof(mbedtls_xtea_context) );
kevman 0:38ceb79fef03 90
kevman 0:38ceb79fef03 91 for( i = 0; i < 4; i++ )
kevman 0:38ceb79fef03 92 {
kevman 0:38ceb79fef03 93 GET_UINT32_BE( ctx->k[i], key, i << 2 );
kevman 0:38ceb79fef03 94 }
kevman 0:38ceb79fef03 95 }
kevman 0:38ceb79fef03 96
kevman 0:38ceb79fef03 97 /*
kevman 0:38ceb79fef03 98 * XTEA encrypt function
kevman 0:38ceb79fef03 99 */
kevman 0:38ceb79fef03 100 int mbedtls_xtea_crypt_ecb( mbedtls_xtea_context *ctx, int mode,
kevman 0:38ceb79fef03 101 const unsigned char input[8], unsigned char output[8])
kevman 0:38ceb79fef03 102 {
kevman 0:38ceb79fef03 103 uint32_t *k, v0, v1, i;
kevman 0:38ceb79fef03 104
kevman 0:38ceb79fef03 105 k = ctx->k;
kevman 0:38ceb79fef03 106
kevman 0:38ceb79fef03 107 GET_UINT32_BE( v0, input, 0 );
kevman 0:38ceb79fef03 108 GET_UINT32_BE( v1, input, 4 );
kevman 0:38ceb79fef03 109
kevman 0:38ceb79fef03 110 if( mode == MBEDTLS_XTEA_ENCRYPT )
kevman 0:38ceb79fef03 111 {
kevman 0:38ceb79fef03 112 uint32_t sum = 0, delta = 0x9E3779B9;
kevman 0:38ceb79fef03 113
kevman 0:38ceb79fef03 114 for( i = 0; i < 32; i++ )
kevman 0:38ceb79fef03 115 {
kevman 0:38ceb79fef03 116 v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + k[sum & 3]);
kevman 0:38ceb79fef03 117 sum += delta;
kevman 0:38ceb79fef03 118 v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + k[(sum>>11) & 3]);
kevman 0:38ceb79fef03 119 }
kevman 0:38ceb79fef03 120 }
kevman 0:38ceb79fef03 121 else /* MBEDTLS_XTEA_DECRYPT */
kevman 0:38ceb79fef03 122 {
kevman 0:38ceb79fef03 123 uint32_t delta = 0x9E3779B9, sum = delta * 32;
kevman 0:38ceb79fef03 124
kevman 0:38ceb79fef03 125 for( i = 0; i < 32; i++ )
kevman 0:38ceb79fef03 126 {
kevman 0:38ceb79fef03 127 v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + k[(sum>>11) & 3]);
kevman 0:38ceb79fef03 128 sum -= delta;
kevman 0:38ceb79fef03 129 v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + k[sum & 3]);
kevman 0:38ceb79fef03 130 }
kevman 0:38ceb79fef03 131 }
kevman 0:38ceb79fef03 132
kevman 0:38ceb79fef03 133 PUT_UINT32_BE( v0, output, 0 );
kevman 0:38ceb79fef03 134 PUT_UINT32_BE( v1, output, 4 );
kevman 0:38ceb79fef03 135
kevman 0:38ceb79fef03 136 return( 0 );
kevman 0:38ceb79fef03 137 }
kevman 0:38ceb79fef03 138
kevman 0:38ceb79fef03 139 #if defined(MBEDTLS_CIPHER_MODE_CBC)
kevman 0:38ceb79fef03 140 /*
kevman 0:38ceb79fef03 141 * XTEA-CBC buffer encryption/decryption
kevman 0:38ceb79fef03 142 */
kevman 0:38ceb79fef03 143 int mbedtls_xtea_crypt_cbc( mbedtls_xtea_context *ctx, int mode, size_t length,
kevman 0:38ceb79fef03 144 unsigned char iv[8], const unsigned char *input,
kevman 0:38ceb79fef03 145 unsigned char *output)
kevman 0:38ceb79fef03 146 {
kevman 0:38ceb79fef03 147 int i;
kevman 0:38ceb79fef03 148 unsigned char temp[8];
kevman 0:38ceb79fef03 149
kevman 0:38ceb79fef03 150 if( length % 8 )
kevman 0:38ceb79fef03 151 return( MBEDTLS_ERR_XTEA_INVALID_INPUT_LENGTH );
kevman 0:38ceb79fef03 152
kevman 0:38ceb79fef03 153 if( mode == MBEDTLS_XTEA_DECRYPT )
kevman 0:38ceb79fef03 154 {
kevman 0:38ceb79fef03 155 while( length > 0 )
kevman 0:38ceb79fef03 156 {
kevman 0:38ceb79fef03 157 memcpy( temp, input, 8 );
kevman 0:38ceb79fef03 158 mbedtls_xtea_crypt_ecb( ctx, mode, input, output );
kevman 0:38ceb79fef03 159
kevman 0:38ceb79fef03 160 for( i = 0; i < 8; i++ )
kevman 0:38ceb79fef03 161 output[i] = (unsigned char)( output[i] ^ iv[i] );
kevman 0:38ceb79fef03 162
kevman 0:38ceb79fef03 163 memcpy( iv, temp, 8 );
kevman 0:38ceb79fef03 164
kevman 0:38ceb79fef03 165 input += 8;
kevman 0:38ceb79fef03 166 output += 8;
kevman 0:38ceb79fef03 167 length -= 8;
kevman 0:38ceb79fef03 168 }
kevman 0:38ceb79fef03 169 }
kevman 0:38ceb79fef03 170 else
kevman 0:38ceb79fef03 171 {
kevman 0:38ceb79fef03 172 while( length > 0 )
kevman 0:38ceb79fef03 173 {
kevman 0:38ceb79fef03 174 for( i = 0; i < 8; i++ )
kevman 0:38ceb79fef03 175 output[i] = (unsigned char)( input[i] ^ iv[i] );
kevman 0:38ceb79fef03 176
kevman 0:38ceb79fef03 177 mbedtls_xtea_crypt_ecb( ctx, mode, output, output );
kevman 0:38ceb79fef03 178 memcpy( iv, output, 8 );
kevman 0:38ceb79fef03 179
kevman 0:38ceb79fef03 180 input += 8;
kevman 0:38ceb79fef03 181 output += 8;
kevman 0:38ceb79fef03 182 length -= 8;
kevman 0:38ceb79fef03 183 }
kevman 0:38ceb79fef03 184 }
kevman 0:38ceb79fef03 185
kevman 0:38ceb79fef03 186 return( 0 );
kevman 0:38ceb79fef03 187 }
kevman 0:38ceb79fef03 188 #endif /* MBEDTLS_CIPHER_MODE_CBC */
kevman 0:38ceb79fef03 189 #endif /* !MBEDTLS_XTEA_ALT */
kevman 0:38ceb79fef03 190
kevman 0:38ceb79fef03 191 #if defined(MBEDTLS_SELF_TEST)
kevman 0:38ceb79fef03 192
kevman 0:38ceb79fef03 193 /*
kevman 0:38ceb79fef03 194 * XTEA tests vectors (non-official)
kevman 0:38ceb79fef03 195 */
kevman 0:38ceb79fef03 196
kevman 0:38ceb79fef03 197 static const unsigned char xtea_test_key[6][16] =
kevman 0:38ceb79fef03 198 {
kevman 0:38ceb79fef03 199 { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
kevman 0:38ceb79fef03 200 0x0c, 0x0d, 0x0e, 0x0f },
kevman 0:38ceb79fef03 201 { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
kevman 0:38ceb79fef03 202 0x0c, 0x0d, 0x0e, 0x0f },
kevman 0:38ceb79fef03 203 { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
kevman 0:38ceb79fef03 204 0x0c, 0x0d, 0x0e, 0x0f },
kevman 0:38ceb79fef03 205 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
kevman 0:38ceb79fef03 206 0x00, 0x00, 0x00, 0x00 },
kevman 0:38ceb79fef03 207 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
kevman 0:38ceb79fef03 208 0x00, 0x00, 0x00, 0x00 },
kevman 0:38ceb79fef03 209 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
kevman 0:38ceb79fef03 210 0x00, 0x00, 0x00, 0x00 }
kevman 0:38ceb79fef03 211 };
kevman 0:38ceb79fef03 212
kevman 0:38ceb79fef03 213 static const unsigned char xtea_test_pt[6][8] =
kevman 0:38ceb79fef03 214 {
kevman 0:38ceb79fef03 215 { 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48 },
kevman 0:38ceb79fef03 216 { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
kevman 0:38ceb79fef03 217 { 0x5a, 0x5b, 0x6e, 0x27, 0x89, 0x48, 0xd7, 0x7f },
kevman 0:38ceb79fef03 218 { 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48 },
kevman 0:38ceb79fef03 219 { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
kevman 0:38ceb79fef03 220 { 0x70, 0xe1, 0x22, 0x5d, 0x6e, 0x4e, 0x76, 0x55 }
kevman 0:38ceb79fef03 221 };
kevman 0:38ceb79fef03 222
kevman 0:38ceb79fef03 223 static const unsigned char xtea_test_ct[6][8] =
kevman 0:38ceb79fef03 224 {
kevman 0:38ceb79fef03 225 { 0x49, 0x7d, 0xf3, 0xd0, 0x72, 0x61, 0x2c, 0xb5 },
kevman 0:38ceb79fef03 226 { 0xe7, 0x8f, 0x2d, 0x13, 0x74, 0x43, 0x41, 0xd8 },
kevman 0:38ceb79fef03 227 { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
kevman 0:38ceb79fef03 228 { 0xa0, 0x39, 0x05, 0x89, 0xf8, 0xb8, 0xef, 0xa5 },
kevman 0:38ceb79fef03 229 { 0xed, 0x23, 0x37, 0x5a, 0x82, 0x1a, 0x8c, 0x2d },
kevman 0:38ceb79fef03 230 { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 }
kevman 0:38ceb79fef03 231 };
kevman 0:38ceb79fef03 232
kevman 0:38ceb79fef03 233 /*
kevman 0:38ceb79fef03 234 * Checkup routine
kevman 0:38ceb79fef03 235 */
kevman 0:38ceb79fef03 236 int mbedtls_xtea_self_test( int verbose )
kevman 0:38ceb79fef03 237 {
kevman 0:38ceb79fef03 238 int i, ret = 0;
kevman 0:38ceb79fef03 239 unsigned char buf[8];
kevman 0:38ceb79fef03 240 mbedtls_xtea_context ctx;
kevman 0:38ceb79fef03 241
kevman 0:38ceb79fef03 242 mbedtls_xtea_init( &ctx );
kevman 0:38ceb79fef03 243 for( i = 0; i < 6; i++ )
kevman 0:38ceb79fef03 244 {
kevman 0:38ceb79fef03 245 if( verbose != 0 )
kevman 0:38ceb79fef03 246 mbedtls_printf( " XTEA test #%d: ", i + 1 );
kevman 0:38ceb79fef03 247
kevman 0:38ceb79fef03 248 memcpy( buf, xtea_test_pt[i], 8 );
kevman 0:38ceb79fef03 249
kevman 0:38ceb79fef03 250 mbedtls_xtea_setup( &ctx, xtea_test_key[i] );
kevman 0:38ceb79fef03 251 mbedtls_xtea_crypt_ecb( &ctx, MBEDTLS_XTEA_ENCRYPT, buf, buf );
kevman 0:38ceb79fef03 252
kevman 0:38ceb79fef03 253 if( memcmp( buf, xtea_test_ct[i], 8 ) != 0 )
kevman 0:38ceb79fef03 254 {
kevman 0:38ceb79fef03 255 if( verbose != 0 )
kevman 0:38ceb79fef03 256 mbedtls_printf( "failed\n" );
kevman 0:38ceb79fef03 257
kevman 0:38ceb79fef03 258 ret = 1;
kevman 0:38ceb79fef03 259 goto exit;
kevman 0:38ceb79fef03 260 }
kevman 0:38ceb79fef03 261
kevman 0:38ceb79fef03 262 if( verbose != 0 )
kevman 0:38ceb79fef03 263 mbedtls_printf( "passed\n" );
kevman 0:38ceb79fef03 264 }
kevman 0:38ceb79fef03 265
kevman 0:38ceb79fef03 266 if( verbose != 0 )
kevman 0:38ceb79fef03 267 mbedtls_printf( "\n" );
kevman 0:38ceb79fef03 268
kevman 0:38ceb79fef03 269 exit:
kevman 0:38ceb79fef03 270 mbedtls_xtea_free( &ctx );
kevman 0:38ceb79fef03 271
kevman 0:38ceb79fef03 272 return( ret );
kevman 0:38ceb79fef03 273 }
kevman 0:38ceb79fef03 274
kevman 0:38ceb79fef03 275 #endif /* MBEDTLS_SELF_TEST */
kevman 0:38ceb79fef03 276
kevman 0:38ceb79fef03 277 #endif /* MBEDTLS_XTEA_C */