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comparison dcrypt/crypto/ciphers/TEA.d @ 14:5ce3012f1def

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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.
author Thomas Dixon <reikon@reikon.us>
date Tue, 18 Nov 2008 18:03:40 -0500
parents 8c7f8fecdd75
children 4589f8c5eb3c
comparison
equal deleted inserted replaced
13:7ea528b61802 14:5ce3012f1def
19 KEY_SIZE = 16, 19 KEY_SIZE = 16,
20 BLOCK_SIZE = 8, 20 BLOCK_SIZE = 8,
21 DELTA = 0x9e3779b9, 21 DELTA = 0x9e3779b9,
22 DECRYPT_SUM = 0xc6ef3720; 22 DECRYPT_SUM = 0xc6ef3720;
23 uint sk0, sk1, sk2, sk3, sum; 23 uint sk0, sk1, sk2, sk3, sum;
24 bool initialized,
25 encrypt;
26 } 24 }
27 25
28 void reset(){} 26 void reset(){}
29 27
30 char[] name() { 28 char[] name() {
38 void init(bool encrypt, CipherParameters params) { 36 void init(bool encrypt, CipherParameters params) {
39 SymmetricKey keyParams = cast(SymmetricKey)params; 37 SymmetricKey keyParams = cast(SymmetricKey)params;
40 if (!keyParams) 38 if (!keyParams)
41 throw new InvalidParameterError( 39 throw new InvalidParameterError(
42 name()~": Invalid parameter passed to init"); 40 name()~": Invalid parameter passed to init");
43 this.encrypt = encrypt; 41 _encrypt = encrypt;
44 42
45 if (keyParams.key.length != KEY_SIZE) 43 if (keyParams.key.length != KEY_SIZE)
46 throw new InvalidKeyError( 44 throw new InvalidKeyError(
47 name()~": Invalid key length (requires 16 bytes)"); 45 name()~": Invalid key length (requires 16 bytes)");
48 46
49 sk0 = Util.ubytesToUintBig(keyParams.key, 0); 47 sk0 = Util.ubytesToUintBig(keyParams.key, 0);
50 sk1 = Util.ubytesToUintBig(keyParams.key, 4); 48 sk1 = Util.ubytesToUintBig(keyParams.key, 4);
51 sk2 = Util.ubytesToUintBig(keyParams.key, 8); 49 sk2 = Util.ubytesToUintBig(keyParams.key, 8);
52 sk3 = Util.ubytesToUintBig(keyParams.key, 12); 50 sk3 = Util.ubytesToUintBig(keyParams.key, 12);
53 51
54 initialized = true; 52 _initialized = true;
55 } 53 }
56 54
57 uint update(void[] input_, void[] output_) { 55 uint update(void[] input_, void[] output_) {
58 if (!initialized) 56 if (!_initialized)
59 throw new NotInitializedError(name()~": Cipher not initialized"); 57 throw new NotInitializedError(name()~": Cipher not initialized");
60 58
61 ubyte[] input = cast(ubyte[]) input_, 59 ubyte[] input = cast(ubyte[]) input_,
62 output = cast(ubyte[]) output_; 60 output = cast(ubyte[]) output_;
63 61
68 throw new ShortBufferError(name()~": Output buffer too short"); 66 throw new ShortBufferError(name()~": Output buffer too short");
69 67
70 uint v0 = Util.ubytesToUintBig(input, 0), 68 uint v0 = Util.ubytesToUintBig(input, 0),
71 v1 = Util.ubytesToUintBig(input, 4); 69 v1 = Util.ubytesToUintBig(input, 4);
72 70
73 sum = encrypt ? 0 : DECRYPT_SUM; 71 sum = _encrypt ? 0 : DECRYPT_SUM;
74 for (int i = 0; i < ROUNDS; i++) { 72 for (int i = 0; i < ROUNDS; i++) {
75 if (encrypt) { 73 if (_encrypt) {
76 sum += DELTA; 74 sum += DELTA;
77 v0 += ((v1 << 4) + sk0) ^ (v1 + sum) ^ ((v1 >> 5) + sk1); 75 v0 += ((v1 << 4) + sk0) ^ (v1 + sum) ^ ((v1 >> 5) + sk1);
78 v1 += ((v0 << 4) + sk2) ^ (v0 + sum) ^ ((v0 >> 5) + sk3); 76 v1 += ((v0 << 4) + sk2) ^ (v0 + sum) ^ ((v0 >> 5) + sk3);
79 } else { 77 } else {
80 v1 -= ((v0 << 4) + sk2) ^ (v0 + sum) ^ ((v0 >> 5) + sk3); 78 v1 -= ((v0 << 4) + sk2) ^ (v0 + sum) ^ ((v0 >> 5) + sk3);