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