Mercurial > projects > dcrypt
annotate dcrypt/crypto/ciphers/XTEA.d @ 6:5cb17e09d685
Minor edits to the unittests of hash functions and ciphers. Added AES and test vectors.
| author | Thomas Dixon <reikon@reikon.us> |
|---|---|
| date | Sat, 16 Aug 2008 22:43:22 -0400 |
| parents | 71aae178f89a |
| children | 23c62e28b3a4 |
| 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 { | |
|
1
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:
0
diff
changeset
|
17 private { |
|
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:
0
diff
changeset
|
18 const uint ROUNDS = 32, |
|
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:
0
diff
changeset
|
19 KEY_SIZE = 16, |
|
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:
0
diff
changeset
|
20 BLOCK_SIZE = 8, |
|
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:
0
diff
changeset
|
21 DELTA = 0x9e3779b9; |
|
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:
0
diff
changeset
|
22 uint[] subkeys, |
|
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:
0
diff
changeset
|
23 sum0, |
|
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:
0
diff
changeset
|
24 sum1; |
|
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:
0
diff
changeset
|
25 bool initialized, |
|
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:
0
diff
changeset
|
26 encrypt; |
|
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:
0
diff
changeset
|
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 | |
| 67 uint processBlock(void[] input_, uint inOff, void[] output_, uint outOff) { | |
| 68 if (!initialized) | |
| 69 throw new NotInitializedError(name()~": Cipher not initialized"); | |
| 70 | |
| 71 ubyte[] input = cast(ubyte[]) input_; | |
| 72 ubyte[] output = cast(ubyte[]) output_; | |
| 73 | |
| 74 if ((inOff + BLOCK_SIZE) > input.length) | |
| 75 throw new ShortBufferError(name()~": Input buffer too short"); | |
| 76 | |
| 77 if ((outOff + BLOCK_SIZE) > output.length) | |
| 78 throw new ShortBufferError(name()~": Output buffer too short"); | |
| 79 | |
| 80 uint v0 = Util.ubytesToUintBig(input, inOff), | |
| 81 v1 = Util.ubytesToUintBig(input, inOff+4); | |
| 82 | |
| 83 if (encrypt) { | |
| 84 for (int i = 0; i < ROUNDS; i++) { | |
| 85 v0 += ((v1 << 4 ^ v1 >> 5) + v1) ^ sum0[i]; | |
| 86 v1 += ((v0 << 4 ^ v0 >> 5) + v0) ^ sum1[i]; | |
| 87 } | |
| 88 } else { | |
| 89 for (int i = ROUNDS-1; i >= 0; i--) { | |
| 90 v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ sum1[i]; | |
| 91 v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ sum0[i]; | |
| 92 } | |
| 93 } | |
| 94 | |
| 95 Util.uintToUbytesBig(v0, output, outOff); | |
| 96 Util.uintToUbytesBig(v1, output, outOff+4); | |
| 97 | |
| 98 return BLOCK_SIZE; | |
| 99 } | |
| 100 | |
| 101 /** Some XTEA test vectors. */ | |
| 102 version (UnitTest) { | |
| 103 unittest { | |
| 104 static const char[][] test_keys = [ | |
| 105 "00000000000000000000000000000000", | |
| 106 "00000000000000000000000000000000", | |
| 107 "0123456712345678234567893456789a", | |
| 108 "0123456712345678234567893456789a", | |
| 109 "00000000000000000000000000000001", | |
| 110 "01010101010101010101010101010101", | |
| 111 "0123456789abcdef0123456789abcdef", | |
| 112 "0123456789abcdef0123456789abcdef", | |
| 113 "00000000000000000000000000000000", | |
| 114 "00000000000000000000000000000000" | |
| 115 ]; | |
| 116 | |
| 117 static const char[][] test_plaintexts = [ | |
| 118 "0000000000000000", | |
| 119 "0102030405060708", | |
| 120 "0000000000000000", | |
| 121 "0102030405060708", | |
| 122 "0000000000000001", | |
| 123 "0101010101010101", | |
| 124 "0123456789abcdef", | |
| 125 "0000000000000000", | |
| 126 "0123456789abcdef", | |
| 127 "4141414141414141" | |
| 128 ]; | |
| 129 | |
| 130 static const char[][] test_ciphertexts = [ | |
| 131 "dee9d4d8f7131ed9", | |
| 132 "065c1b8975c6a816", | |
| 133 "1ff9a0261ac64264", | |
| 134 "8c67155b2ef91ead", | |
| 135 "9f25fa5b0f86b758", | |
| 136 "c2eca7cec9b7f992", | |
| 137 "27e795e076b2b537", | |
| 138 "5c8eddc60a95b3e1", | |
| 139 "7e66c71c88897221", | |
| 140 "ed23375a821a8c2d" | |
| 141 ]; | |
| 142 | |
| 143 XTEA t = new XTEA(); | |
| 144 foreach (uint i, char[] test_key; test_keys) { | |
| 145 ubyte[] buffer = new ubyte[t.blockSize]; | |
| 146 char[] result; | |
| 147 SymmetricKey key = new SymmetricKey(Util.hexToUbytes(test_key)); | |
| 148 | |
| 149 // Encryption | |
| 150 t.init(true, key); | |
| 151 t.processBlock(Util.hexToUbytes(test_plaintexts[i]), 0, buffer, 0); | |
| 152 result = Util.ubytesToHex(buffer); | |
| 153 assert(result == test_ciphertexts[i], | |
|
2
71aae178f89a
Added copy() to hash functions. Modified some code style.
Thomas Dixon <reikon@reikon.us>
parents:
1
diff
changeset
|
154 t.name~": ("~result~") != ("~test_ciphertexts[i]~")"); |
| 0 | 155 |
| 156 // Decryption | |
| 157 t.init(false, key); | |
| 158 t.processBlock(Util.hexToUbytes(test_ciphertexts[i]), 0, buffer, 0); | |
| 159 result = Util.ubytesToHex(buffer); | |
| 160 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
changeset
|
161 t.name~": ("~result~") != ("~test_plaintexts[i]~")"); |
| 0 | 162 } |
| 163 } | |
| 164 } | |
| 165 } |