Mercurial > projects > dcrypt
annotate dcrypt/crypto/ciphers/XTEA.d @ 8:23c62e28b3a4
Reworked symmetric cipher classes to have SymmetricCipher as their superclass, and follow the general interface of init(), process(), etc. Made sure everything still passed test vectors. Removed Cipher class. I'll worry about that shit when we support something other than symmetric ciphers.
| author | Thomas Dixon <reikon@reikon.us> |
|---|---|
| date | Mon, 18 Aug 2008 01:14:37 -0400 |
| parents | 5cb17e09d685 |
| children | 8c7f8fecdd75 |
| rev | line source |
|---|---|
| 0 | 1 /** |
| 2 * This file is part of the dcrypt project. | |
| 3 * | |
| 4 * Copyright: Copyright (C) dcrypt contributors 2008. All rights reserved. | |
| 5 * License: MIT | |
| 6 * Authors: Thomas Dixon | |
| 7 */ | |
| 8 | |
| 9 module dcrypt.crypto.ciphers.XTEA; | |
| 10 | |
| 11 import dcrypt.misc.Util; | |
| 12 import dcrypt.crypto.BlockCipher; | |
| 13 | |
| 14 /** Implementation of the XTEA cipher designed by | |
| 15 David Wheeler and Roger Needham. */ | |
| 16 class XTEA : BlockCipher { | |
|
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483e4467b5f6
Added Blowfish with test vectors. Minor cleanup of other cipher classes (should probably clean more). Continued work on high-level cipher API (didn't get very far).
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17 private { |
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483e4467b5f6
Added Blowfish with test vectors. Minor cleanup of other cipher classes (should probably clean more). Continued work on high-level cipher API (didn't get very far).
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18 const uint ROUNDS = 32, |
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483e4467b5f6
Added Blowfish with test vectors. Minor cleanup of other cipher classes (should probably clean more). Continued work on high-level cipher API (didn't get very far).
Thomas Dixon <reikon@reikon.us>
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19 KEY_SIZE = 16, |
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483e4467b5f6
Added Blowfish with test vectors. Minor cleanup of other cipher classes (should probably clean more). Continued work on high-level cipher API (didn't get very far).
Thomas Dixon <reikon@reikon.us>
parents:
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20 BLOCK_SIZE = 8, |
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483e4467b5f6
Added Blowfish with test vectors. Minor cleanup of other cipher classes (should probably clean more). Continued work on high-level cipher API (didn't get very far).
Thomas Dixon <reikon@reikon.us>
parents:
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21 DELTA = 0x9e3779b9; |
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483e4467b5f6
Added Blowfish with test vectors. Minor cleanup of other cipher classes (should probably clean more). Continued work on high-level cipher API (didn't get very far).
Thomas Dixon <reikon@reikon.us>
parents:
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22 uint[] subkeys, |
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483e4467b5f6
Added Blowfish with test vectors. Minor cleanup of other cipher classes (should probably clean more). Continued work on high-level cipher API (didn't get very far).
Thomas Dixon <reikon@reikon.us>
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23 sum0, |
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483e4467b5f6
Added Blowfish with test vectors. Minor cleanup of other cipher classes (should probably clean more). Continued work on high-level cipher API (didn't get very far).
Thomas Dixon <reikon@reikon.us>
parents:
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24 sum1; |
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483e4467b5f6
Added Blowfish with test vectors. Minor cleanup of other cipher classes (should probably clean more). Continued work on high-level cipher API (didn't get very far).
Thomas Dixon <reikon@reikon.us>
parents:
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25 bool initialized, |
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483e4467b5f6
Added Blowfish with test vectors. Minor cleanup of other cipher classes (should probably clean more). Continued work on high-level cipher API (didn't get very far).
Thomas Dixon <reikon@reikon.us>
parents:
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26 encrypt; |
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483e4467b5f6
Added Blowfish with test vectors. Minor cleanup of other cipher classes (should probably clean more). Continued work on high-level cipher API (didn't get very far).
Thomas Dixon <reikon@reikon.us>
parents:
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diff
changeset
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27 } |
| 0 | 28 |
| 29 void reset(){} | |
| 30 | |
| 31 char[] name() { | |
| 32 return "XTEA"; | |
| 33 } | |
| 34 | |
| 35 uint blockSize() { | |
| 36 return BLOCK_SIZE; | |
| 37 } | |
| 38 | |
| 39 void init(bool encrypt, CipherParameters params) { | |
| 40 SymmetricKey keyParams = cast(SymmetricKey)params; | |
| 41 if (!keyParams) | |
| 42 throw new InvalidParameterError( | |
| 43 name()~": Invalid parameter passed to init"); | |
| 44 this.encrypt = encrypt; | |
| 45 | |
| 46 if (keyParams.key.length != KEY_SIZE) | |
| 47 throw new InvalidKeyError( | |
| 48 name()~": Invalid key length (requires 16 bytes)"); | |
| 49 | |
| 50 subkeys = new uint[4]; | |
| 51 sum0 = new uint[32]; | |
| 52 sum1 = new uint[32]; | |
| 53 | |
| 54 int i, j; | |
| 55 for (i = j = 0; i < 4; i++, j+=4) | |
| 56 subkeys[i] = Util.ubytesToUintBig(keyParams.key, j); | |
| 57 | |
| 58 // Precompute the values of sum + k[] to speed up encryption | |
| 59 for (i = j = 0; i < ROUNDS; i++) { | |
| 60 sum0[i] = (j + subkeys[j & 3]); | |
| 61 j += DELTA; | |
| 62 sum1[i] = (j + subkeys[j >> 11 & 3]); | |
| 63 } | |
| 64 initialized = true; | |
| 65 } | |
| 66 | |
|
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23c62e28b3a4
Reworked symmetric cipher classes to have SymmetricCipher as their superclass, and follow the general interface of init(), process(), etc. Made sure everything still passed test vectors. Removed Cipher class. I'll worry about that shit when we support something other than symmetric ciphers.
Thomas Dixon <reikon@reikon.us>
parents:
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67 ubyte[] process(void[] input_) { |
| 0 | 68 if (!initialized) |
| 69 throw new NotInitializedError(name()~": Cipher not initialized"); | |
| 70 | |
| 71 ubyte[] input = cast(ubyte[]) input_; | |
| 72 | |
|
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23c62e28b3a4
Reworked symmetric cipher classes to have SymmetricCipher as their superclass, and follow the general interface of init(), process(), etc. Made sure everything still passed test vectors. Removed Cipher class. I'll worry about that shit when we support something other than symmetric ciphers.
Thomas Dixon <reikon@reikon.us>
parents:
6
diff
changeset
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73 if (input.length < blockSize) |
| 0 | 74 throw new ShortBufferError(name()~": Input buffer too short"); |
| 75 | |
|
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23c62e28b3a4
Reworked symmetric cipher classes to have SymmetricCipher as their superclass, and follow the general interface of init(), process(), etc. Made sure everything still passed test vectors. Removed Cipher class. I'll worry about that shit when we support something other than symmetric ciphers.
Thomas Dixon <reikon@reikon.us>
parents:
6
diff
changeset
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76 uint v0 = Util.ubytesToUintBig(input, 0), |
|
23c62e28b3a4
Reworked symmetric cipher classes to have SymmetricCipher as their superclass, and follow the general interface of init(), process(), etc. Made sure everything still passed test vectors. Removed Cipher class. I'll worry about that shit when we support something other than symmetric ciphers.
Thomas Dixon <reikon@reikon.us>
parents:
6
diff
changeset
|
77 v1 = Util.ubytesToUintBig(input, 4); |
| 0 | 78 |
| 79 if (encrypt) { | |
| 80 for (int i = 0; i < ROUNDS; i++) { | |
| 81 v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ sum0[i]; | |
| 82 v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ sum1[i]; | |
| 83 } | |
| 84 } else { | |
| 85 for (int i = ROUNDS-1; i >= 0; i--) { | |
| 86 v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ sum1[i]; | |
| 87 v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ sum0[i]; | |
| 88 } | |
| 89 } | |
| 90 | |
|
8
23c62e28b3a4
Reworked symmetric cipher classes to have SymmetricCipher as their superclass, and follow the general interface of init(), process(), etc. Made sure everything still passed test vectors. Removed Cipher class. I'll worry about that shit when we support something other than symmetric ciphers.
Thomas Dixon <reikon@reikon.us>
parents:
6
diff
changeset
|
91 ubyte[] output = new ubyte[blockSize]; |
|
23c62e28b3a4
Reworked symmetric cipher classes to have SymmetricCipher as their superclass, and follow the general interface of init(), process(), etc. Made sure everything still passed test vectors. Removed Cipher class. I'll worry about that shit when we support something other than symmetric ciphers.
Thomas Dixon <reikon@reikon.us>
parents:
6
diff
changeset
|
92 Util.uintToUbytesBig(v0, output, 0); |
|
23c62e28b3a4
Reworked symmetric cipher classes to have SymmetricCipher as their superclass, and follow the general interface of init(), process(), etc. Made sure everything still passed test vectors. Removed Cipher class. I'll worry about that shit when we support something other than symmetric ciphers.
Thomas Dixon <reikon@reikon.us>
parents:
6
diff
changeset
|
93 Util.uintToUbytesBig(v1, output, 4); |
| 0 | 94 |
|
8
23c62e28b3a4
Reworked symmetric cipher classes to have SymmetricCipher as their superclass, and follow the general interface of init(), process(), etc. Made sure everything still passed test vectors. Removed Cipher class. I'll worry about that shit when we support something other than symmetric ciphers.
Thomas Dixon <reikon@reikon.us>
parents:
6
diff
changeset
|
95 return output; |
| 0 | 96 } |
| 97 | |
| 98 /** Some XTEA test vectors. */ | |
| 99 version (UnitTest) { | |
| 100 unittest { | |
| 101 static const char[][] test_keys = [ | |
| 102 "00000000000000000000000000000000", | |
| 103 "00000000000000000000000000000000", | |
| 104 "0123456712345678234567893456789a", | |
| 105 "0123456712345678234567893456789a", | |
| 106 "00000000000000000000000000000001", | |
| 107 "01010101010101010101010101010101", | |
| 108 "0123456789abcdef0123456789abcdef", | |
| 109 "0123456789abcdef0123456789abcdef", | |
| 110 "00000000000000000000000000000000", | |
| 111 "00000000000000000000000000000000" | |
| 112 ]; | |
| 113 | |
| 114 static const char[][] test_plaintexts = [ | |
| 115 "0000000000000000", | |
| 116 "0102030405060708", | |
| 117 "0000000000000000", | |
| 118 "0102030405060708", | |
| 119 "0000000000000001", | |
| 120 "0101010101010101", | |
| 121 "0123456789abcdef", | |
| 122 "0000000000000000", | |
| 123 "0123456789abcdef", | |
| 124 "4141414141414141" | |
| 125 ]; | |
| 126 | |
| 127 static const char[][] test_ciphertexts = [ | |
| 128 "dee9d4d8f7131ed9", | |
| 129 "065c1b8975c6a816", | |
| 130 "1ff9a0261ac64264", | |
| 131 "8c67155b2ef91ead", | |
| 132 "9f25fa5b0f86b758", | |
| 133 "c2eca7cec9b7f992", | |
| 134 "27e795e076b2b537", | |
| 135 "5c8eddc60a95b3e1", | |
| 136 "7e66c71c88897221", | |
| 137 "ed23375a821a8c2d" | |
| 138 ]; | |
| 139 | |
| 140 XTEA t = new XTEA(); | |
| 141 foreach (uint i, char[] test_key; test_keys) { | |
| 142 ubyte[] buffer = new ubyte[t.blockSize]; | |
| 143 char[] result; | |
| 144 SymmetricKey key = new SymmetricKey(Util.hexToUbytes(test_key)); | |
| 145 | |
| 146 // Encryption | |
| 147 t.init(true, key); | |
|
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23c62e28b3a4
Reworked symmetric cipher classes to have SymmetricCipher as their superclass, and follow the general interface of init(), process(), etc. Made sure everything still passed test vectors. Removed Cipher class. I'll worry about that shit when we support something other than symmetric ciphers.
Thomas Dixon <reikon@reikon.us>
parents:
6
diff
changeset
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148 buffer = t.process(Util.hexToUbytes(test_plaintexts[i])); |
| 0 | 149 result = Util.ubytesToHex(buffer); |
| 150 assert(result == test_ciphertexts[i], | |
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2
71aae178f89a
Added copy() to hash functions. Modified some code style.
Thomas Dixon <reikon@reikon.us>
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151 t.name~": ("~result~") != ("~test_ciphertexts[i]~")"); |
| 0 | 152 |
| 153 // Decryption | |
| 154 t.init(false, key); | |
|
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23c62e28b3a4
Reworked symmetric cipher classes to have SymmetricCipher as their superclass, and follow the general interface of init(), process(), etc. Made sure everything still passed test vectors. Removed Cipher class. I'll worry about that shit when we support something other than symmetric ciphers.
Thomas Dixon <reikon@reikon.us>
parents:
6
diff
changeset
|
155 buffer = t.process(Util.hexToUbytes(test_ciphertexts[i])); |
| 0 | 156 result = Util.ubytesToHex(buffer); |
| 157 assert(result == test_plaintexts[i], | |
|
6
5cb17e09d685
Minor edits to the unittests of hash functions and ciphers. Added AES and test vectors.
Thomas Dixon <reikon@reikon.us>
parents:
2
diff
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158 t.name~": ("~result~") != ("~test_plaintexts[i]~")"); |
| 0 | 159 } |
| 160 } | |
| 161 } | |
| 162 } |