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comparison dcrypt/crypto/ciphers/XTEA.d @ 12:8c7f8fecdd75

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Added ManagedBlockCipher, changed Crypto to just import everything, made Hash.update() return itself (for chaining) and ditched BlockCipherWrapper.
author Thomas Dixon <reikon@reikon.us>
date Sat, 30 Aug 2008 14:38:23 -0400
parents 23c62e28b3a4
children 5ce3012f1def
comparison
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11:02970e63257d 12:8c7f8fecdd75
62 sum1[i] = (j + subkeys[j >> 11 & 3]); 62 sum1[i] = (j + subkeys[j >> 11 & 3]);
63 } 63 }
64 initialized = true; 64 initialized = true;
65 } 65 }
66 66
67 ubyte[] process(void[] input_) { 67 uint update(void[] input_, void[] output_) {
68 if (!initialized) 68 if (!initialized)
69 throw new NotInitializedError(name()~": Cipher not initialized"); 69 throw new NotInitializedError(name()~": Cipher not initialized");
70 70
71 ubyte[] input = cast(ubyte[]) input_; 71 ubyte[] input = cast(ubyte[]) input_,
72 output = cast(ubyte[]) output_;
72 73
73 if (input.length < blockSize) 74 if (input.length < BLOCK_SIZE)
74 throw new ShortBufferError(name()~": Input buffer too short"); 75 throw new ShortBufferError(name()~": Input buffer too short");
76
77 if (output.length < BLOCK_SIZE)
78 throw new ShortBufferError(name()~": Output buffer too short");
75 79
76 uint v0 = Util.ubytesToUintBig(input, 0), 80 uint v0 = Util.ubytesToUintBig(input, 0),
77 v1 = Util.ubytesToUintBig(input, 4); 81 v1 = Util.ubytesToUintBig(input, 4);
78 82
79 if (encrypt) { 83 if (encrypt) {
86 v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ sum1[i]; 90 v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ sum1[i];
87 v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ sum0[i]; 91 v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ sum0[i];
88 } 92 }
89 } 93 }
90 94
91 ubyte[] output = new ubyte[blockSize];
92 Util.uintToUbytesBig(v0, output, 0); 95 Util.uintToUbytesBig(v0, output, 0);
93 Util.uintToUbytesBig(v1, output, 4); 96 Util.uintToUbytesBig(v1, output, 4);
94 97
95 return output; 98 return BLOCK_SIZE;
96 } 99 }
97 100
98 /** Some XTEA test vectors. */ 101 /** Some XTEA test vectors. */
99 version (UnitTest) { 102 version (UnitTest) {
100 unittest { 103 unittest {
143 char[] result; 146 char[] result;
144 SymmetricKey key = new SymmetricKey(Util.hexToUbytes(test_key)); 147 SymmetricKey key = new SymmetricKey(Util.hexToUbytes(test_key));
145 148
146 // Encryption 149 // Encryption
147 t.init(true, key); 150 t.init(true, key);
148 buffer = t.process(Util.hexToUbytes(test_plaintexts[i])); 151 t.update(Util.hexToUbytes(test_plaintexts[i]), buffer);
149 result = Util.ubytesToHex(buffer); 152 result = Util.ubytesToHex(buffer);
150 assert(result == test_ciphertexts[i], 153 assert(result == test_ciphertexts[i],
151 t.name~": ("~result~") != ("~test_ciphertexts[i]~")"); 154 t.name~": ("~result~") != ("~test_ciphertexts[i]~")");
152 155
153 // Decryption 156 // Decryption
154 t.init(false, key); 157 t.init(false, key);
155 buffer = t.process(Util.hexToUbytes(test_ciphertexts[i])); 158 t.update(Util.hexToUbytes(test_ciphertexts[i]), buffer);
156 result = Util.ubytesToHex(buffer); 159 result = Util.ubytesToHex(buffer);
157 assert(result == test_plaintexts[i], 160 assert(result == test_plaintexts[i],
158 t.name~": ("~result~") != ("~test_plaintexts[i]~")"); 161 t.name~": ("~result~") != ("~test_plaintexts[i]~")");
159 } 162 }
160 } 163 }