reactos/dll/3rdparty/mbedtls/xtea.c

   1 /*
   2  *  An 32-bit implementation of the XTEA algorithm
   3  *
   4  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
   5  *  SPDX-License-Identifier: Apache-2.0
   6  *
   7  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
   8  *  not use this file except in compliance with the License.
   9  *  You may obtain a copy of the License at
  10  *
  11  *  http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  *  Unless required by applicable law or agreed to in writing, software
  14  *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  15  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  *  See the License for the specific language governing permissions and
  17  *  limitations under the License.
  18  *
  19  *  This file is part of mbed TLS (https://tls.mbed.org)
  20  */
  21
  22 #if !defined(MBEDTLS_CONFIG_FILE)
  23 #include "mbedtls/config.h"
  24 #else
  25 #include MBEDTLS_CONFIG_FILE
  26 #endif
  27
  28 #if defined(MBEDTLS_XTEA_C)
  29
  30 #include "mbedtls/xtea.h"
  31
  32 #include <string.h>
  33
  34 #if defined(MBEDTLS_SELF_TEST)
  35 #if defined(MBEDTLS_PLATFORM_C)
  36 #include "mbedtls/platform.h"
  37 #else
  38 #include <stdio.h>
  39 #define mbedtls_printf printf
  40 #endif /* MBEDTLS_PLATFORM_C */
  41 #endif /* MBEDTLS_SELF_TEST */
  42
  43 #if !defined(MBEDTLS_XTEA_ALT)
  44
  45 /* Implementation that should never be optimized out by the compiler */
  46 static void mbedtls_zeroize( void *v, size_t n ) {
  47     volatile unsigned char *p = v; while( n-- ) *p++ = 0;
  48 }
  49
  50 /*
  51  * 32-bit integer manipulation macros (big endian)
  52  */
  53 #ifndef GET_UINT32_BE
  54 #define GET_UINT32_BE(n,b,i)                            \
  55 {                                                       \
  56     (n) = ( (uint32_t) (b)[(i)    ] << 24 )             \
  57         | ( (uint32_t) (b)[(i) + 1] << 16 )             \
  58         | ( (uint32_t) (b)[(i) + 2] <<  8 )             \
  59         | ( (uint32_t) (b)[(i) + 3]       );            \
  60 }
  61 #endif
  62
  63 #ifndef PUT_UINT32_BE
  64 #define PUT_UINT32_BE(n,b,i)                            \
  65 {                                                       \
  66     (b)[(i)    ] = (unsigned char) ( (n) >> 24 );       \
  67     (b)[(i) + 1] = (unsigned char) ( (n) >> 16 );       \
  68     (b)[(i) + 2] = (unsigned char) ( (n) >>  8 );       \
  69     (b)[(i) + 3] = (unsigned char) ( (n)       );       \
  70 }
  71 #endif
  72
  73 void mbedtls_xtea_init( mbedtls_xtea_context *ctx )
  74 {
  75     memset( ctx, 0, sizeof( mbedtls_xtea_context ) );
  76 }
  77
  78 void mbedtls_xtea_free( mbedtls_xtea_context *ctx )
  79 {
  80     if( ctx == NULL )
  81         return;
  82
  83     mbedtls_zeroize( ctx, sizeof( mbedtls_xtea_context ) );
  84 }
  85
  86 /*
  87  * XTEA key schedule
  88  */
  89 void mbedtls_xtea_setup( mbedtls_xtea_context *ctx, const unsigned char key[16] )
  90 {
  91     int i;
  92
  93     memset( ctx, 0, sizeof(mbedtls_xtea_context) );
  94
  95     for( i = 0; i < 4; i++ )
  96     {
  97         GET_UINT32_BE( ctx->k[i], key, i << 2 );
  98     }
  99 }
 100
 101 /*
 102  * XTEA encrypt function
 103  */
 104 int mbedtls_xtea_crypt_ecb( mbedtls_xtea_context *ctx, int mode,
 105                     const unsigned char input[8], unsigned char output[8])
 106 {
 107     uint32_t *k, v0, v1, i;
 108
 109     k = ctx->k;
 110
 111     GET_UINT32_BE( v0, input, 0 );
 112     GET_UINT32_BE( v1, input, 4 );
 113
 114     if( mode == MBEDTLS_XTEA_ENCRYPT )
 115     {
 116         uint32_t sum = 0, delta = 0x9E3779B9;
 117
 118         for( i = 0; i < 32; i++ )
 119         {
 120             v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + k[sum & 3]);
 121             sum += delta;
 122             v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + k[(sum>>11) & 3]);
 123         }
 124     }
 125     else /* MBEDTLS_XTEA_DECRYPT */
 126     {
 127         uint32_t delta = 0x9E3779B9, sum = delta * 32;
 128
 129         for( i = 0; i < 32; i++ )
 130         {
 131             v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + k[(sum>>11) & 3]);
 132             sum -= delta;
 133             v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + k[sum & 3]);
 134         }
 135     }
 136
 137     PUT_UINT32_BE( v0, output, 0 );
 138     PUT_UINT32_BE( v1, output, 4 );
 139
 140     return( 0 );
 141 }
 142
 143 #if defined(MBEDTLS_CIPHER_MODE_CBC)
 144 /*
 145  * XTEA-CBC buffer encryption/decryption
 146  */
 147 int mbedtls_xtea_crypt_cbc( mbedtls_xtea_context *ctx, int mode, size_t length,
 148                     unsigned char iv[8], const unsigned char *input,
 149                     unsigned char *output)
 150 {
 151     int i;
 152     unsigned char temp[8];
 153
 154     if( length % 8 )
 155         return( MBEDTLS_ERR_XTEA_INVALID_INPUT_LENGTH );
 156
 157     if( mode == MBEDTLS_XTEA_DECRYPT )
 158     {
 159         while( length > 0 )
 160         {
 161             memcpy( temp, input, 8 );
 162             mbedtls_xtea_crypt_ecb( ctx, mode, input, output );
 163
 164             for( i = 0; i < 8; i++ )
 165                 output[i] = (unsigned char)( output[i] ^ iv[i] );
 166
 167             memcpy( iv, temp, 8 );
 168
 169             input  += 8;
 170             output += 8;
 171             length -= 8;
 172         }
 173     }
 174     else
 175     {
 176         while( length > 0 )
 177         {
 178             for( i = 0; i < 8; i++ )
 179                 output[i] = (unsigned char)( input[i] ^ iv[i] );
 180
 181             mbedtls_xtea_crypt_ecb( ctx, mode, output, output );
 182             memcpy( iv, output, 8 );
 183
 184             input  += 8;
 185             output += 8;
 186             length -= 8;
 187         }
 188     }
 189
 190     return( 0 );
 191 }
 192 #endif /* MBEDTLS_CIPHER_MODE_CBC */
 193 #endif /* !MBEDTLS_XTEA_ALT */
 194
 195 #if defined(MBEDTLS_SELF_TEST)
 196
 197 /*
 198  * XTEA tests vectors (non-official)
 199  */
 200
 201 static const unsigned char xtea_test_key[6][16] =
 202 {
 203    { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
 204      0x0c, 0x0d, 0x0e, 0x0f },
 205    { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
 206      0x0c, 0x0d, 0x0e, 0x0f },
 207    { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
 208      0x0c, 0x0d, 0x0e, 0x0f },
 209    { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 210      0x00, 0x00, 0x00, 0x00 },
 211    { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 212      0x00, 0x00, 0x00, 0x00 },
 213    { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 214      0x00, 0x00, 0x00, 0x00 }
 215 };
 216
 217 static const unsigned char xtea_test_pt[6][8] =
 218 {
 219     { 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48 },
 220     { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
 221     { 0x5a, 0x5b, 0x6e, 0x27, 0x89, 0x48, 0xd7, 0x7f },
 222     { 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48 },
 223     { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
 224     { 0x70, 0xe1, 0x22, 0x5d, 0x6e, 0x4e, 0x76, 0x55 }
 225 };
 226
 227 static const unsigned char xtea_test_ct[6][8] =
 228 {
 229     { 0x49, 0x7d, 0xf3, 0xd0, 0x72, 0x61, 0x2c, 0xb5 },
 230     { 0xe7, 0x8f, 0x2d, 0x13, 0x74, 0x43, 0x41, 0xd8 },
 231     { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
 232     { 0xa0, 0x39, 0x05, 0x89, 0xf8, 0xb8, 0xef, 0xa5 },
 233     { 0xed, 0x23, 0x37, 0x5a, 0x82, 0x1a, 0x8c, 0x2d },
 234     { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 }
 235 };
 236
 237 /*
 238  * Checkup routine
 239  */
 240 int mbedtls_xtea_self_test( int verbose )
 241 {
 242     int i, ret = 0;
 243     unsigned char buf[8];
 244     mbedtls_xtea_context ctx;
 245
 246     mbedtls_xtea_init( &ctx );
 247     for( i = 0; i < 6; i++ )
 248     {
 249         if( verbose != 0 )
 250             mbedtls_printf( "  XTEA test #%d: ", i + 1 );
 251
 252         memcpy( buf, xtea_test_pt[i], 8 );
 253
 254         mbedtls_xtea_setup( &ctx, xtea_test_key[i] );
 255         mbedtls_xtea_crypt_ecb( &ctx, MBEDTLS_XTEA_ENCRYPT, buf, buf );
 256
 257         if( memcmp( buf, xtea_test_ct[i], 8 ) != 0 )
 258         {
 259             if( verbose != 0 )
 260                 mbedtls_printf( "failed\n" );
 261
 262             ret = 1;
 263             goto exit;
 264         }
 265
 266         if( verbose != 0 )
 267             mbedtls_printf( "passed\n" );
 268     }
 269
 270     if( verbose != 0 )
 271         mbedtls_printf( "\n" );
 272
 273 exit:
 274     mbedtls_xtea_free( &ctx );
 275
 276     return( ret );
 277 }
 278
 279 #endif /* MBEDTLS_SELF_TEST */
 280
 281 #endif /* MBEDTLS_XTEA_C */