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annotate dcrypt/crypto/ciphers/TEA.d @ 27:8b5eaf3c2979

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Fixed error in hash message padding reported by Glenn Haecker.
author Thomas Dixon <reikon@reikon.us>
date Sat, 09 May 2009 23:29:20 -0400
parents 4589f8c5eb3c
children ad687db713a4
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0
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1 /**
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2 * This file is part of the dcrypt project.
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3 *
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4 * Copyright: Copyright (C) dcrypt contributors 2008. All rights reserved.
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5 * License: MIT
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6 * Authors: Thomas Dixon
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7 */
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8
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9 module dcrypt.crypto.ciphers.TEA;
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10
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11 import dcrypt.misc.ByteConverter;
0
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12 import dcrypt.crypto.BlockCipher;
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13
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14 /** Implementation of the TEA cipher designed by
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15 David Wheeler and Roger Needham. */
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16 class TEA : BlockCipher
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17 {
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18 private
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19 {
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20 const uint ROUNDS = 32,
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21 KEY_SIZE = 16,
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22 BLOCK_SIZE = 8,
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23 DELTA = 0x9e3779b9u,
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24 DECRYPT_SUM = 0xc6ef3720u;
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25 uint sk0, sk1, sk2, sk3, sum;
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26 }
0
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27
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28 void reset(){}
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29
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30 char[] name()
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31 {
0
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32 return "TEA";
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33 }
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34
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35 uint blockSize()
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36 {
0
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37 return BLOCK_SIZE;
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38 }
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39
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40 void init(bool encrypt, CipherParameters params)
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41 {
0
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42 SymmetricKey keyParams = cast(SymmetricKey)params;
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43 if (!keyParams)
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44 throw new InvalidParameterError(
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45 name()~": Invalid parameter passed to init");
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46
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5ce3012f1def Removed some redundancy in code. Added NotSupportedError, a base PRNG class and a class which creates a PRNG from a hash function. Changed the MAC class' finalization methods to digest and hexDigest instead of finish and hexFinish respectively. Also added a base Checksum class, crc32 and adler32 in dcrypt.misc as per request.
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47 _encrypt = encrypt;
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48
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49 if (keyParams.key.length != KEY_SIZE)
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50 throw new InvalidKeyError(
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51 name()~": Invalid key length (requires 16 bytes)");
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52
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53 sk0 = ByteConverter.BigEndian.to!(uint)(keyParams.key[0..4]);
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54 sk1 = ByteConverter.BigEndian.to!(uint)(keyParams.key[4..8]);
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55 sk2 = ByteConverter.BigEndian.to!(uint)(keyParams.key[8..12]);
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56 sk3 = ByteConverter.BigEndian.to!(uint)(keyParams.key[12..16]);
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57
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5ce3012f1def Removed some redundancy in code. Added NotSupportedError, a base PRNG class and a class which creates a PRNG from a hash function. Changed the MAC class' finalization methods to digest and hexDigest instead of finish and hexFinish respectively. Also added a base Checksum class, crc32 and adler32 in dcrypt.misc as per request.
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58 _initialized = true;
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59 }
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60
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61 uint update(void[] input_, void[] output_)
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62 {
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63 if (!_initialized)
0
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64 throw new NotInitializedError(name()~": Cipher not initialized");
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65
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66 ubyte[] input = cast(ubyte[]) input_,
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67 output = cast(ubyte[]) output_;
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68
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69 if (input.length < BLOCK_SIZE)
0
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70 throw new ShortBufferError(name()~": Input buffer too short");
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71
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72 if (output.length < BLOCK_SIZE)
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73 throw new ShortBufferError(name()~": Output buffer too short");
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74
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75 uint v0 = ByteConverter.BigEndian.to!(uint)(input[0..4]),
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76 v1 = ByteConverter.BigEndian.to!(uint)(input[4..8]);
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77
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78 sum = _encrypt ? 0 : DECRYPT_SUM;
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79 for (int i = 0; i < ROUNDS; i++)
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80 {
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81 if (_encrypt)
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82 {
0
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83 sum += DELTA;
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84 v0 += ((v1 << 4) + sk0) ^ (v1 + sum) ^ ((v1 >> 5) + sk1);
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85 v1 += ((v0 << 4) + sk2) ^ (v0 + sum) ^ ((v0 >> 5) + sk3);
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86 }
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87 else
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88 {
0
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89 v1 -= ((v0 << 4) + sk2) ^ (v0 + sum) ^ ((v0 >> 5) + sk3);
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90 v0 -= ((v1 << 4) + sk0) ^ (v1 + sum) ^ ((v1 >> 5) + sk1);
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91 sum -= DELTA;
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92 }
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93 }
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94
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95 output[0..4] = ByteConverter.BigEndian.from!(uint)(v0);
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96 output[4..8] = ByteConverter.BigEndian.from!(uint)(v1);
0
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97
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98 return BLOCK_SIZE;
0
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99 }
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100
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101 /** Some TEA test vectors. */
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102 debug (UnitTest)
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103 {
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104 unittest
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105 {
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106 static const char[][] test_keys = [
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107 "00000000000000000000000000000000",
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108 "00000000000000000000000000000000",
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109 "0123456712345678234567893456789a",
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110 "0123456712345678234567893456789a"
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111 ];
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112
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113 static const char[][] test_plaintexts = [
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114 "0000000000000000",
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115 "0102030405060708",
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116 "0000000000000000",
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117 "0102030405060708"
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118 ];
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119
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120 static const char[][] test_ciphertexts = [
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121 "41ea3a0a94baa940",
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122 "6a2f9cf3fccf3c55",
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123 "34e943b0900f5dcb",
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124 "773dc179878a81c0"
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125 ];
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126
0
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127
27
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128 TEA t = new TEA();
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129 foreach (uint i, char[] test_key; test_keys)
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130 {
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131 ubyte[] buffer = new ubyte[t.blockSize];
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132 char[] result;
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133 SymmetricKey key = new SymmetricKey(ByteConverter.hexDecode(test_key));
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134
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135 // Encryption
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136 t.init(true, key);
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137 t.update(ByteConverter.hexDecode(test_plaintexts[i]), buffer);
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138 result = ByteConverter.hexEncode(buffer);
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139 assert(result == test_ciphertexts[i],
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140 t.name~": ("~result~") != ("~test_ciphertexts[i]~")");
0
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141
27
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142 // Decryption
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143 t.init(false, key);
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144 t.update(ByteConverter.hexDecode(test_ciphertexts[i]), buffer);
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145 result = ByteConverter.hexEncode(buffer);
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146 assert(result == test_plaintexts[i],
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147 t.name~": ("~result~") != ("~test_plaintexts[i]~")");
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148 }
0
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149 }
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150 }
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151 }