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annotate dcrypt/crypto/Hash.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 cff9960a019c
children 5ce3012f1def
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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.Hash;
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10
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11 public import dcrypt.misc.Util;
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12
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13 /** Base class for all cryptographic hash functions */
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14 class Hash {
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15 private const enum {
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16 MODE_MD=0, // MDx, RipeMD, etc
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17 MODE_SHA,
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18 MODE_TIGER
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19 }
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20
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21 protected {
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22 ubyte[] buffer;
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23 ulong bytes;
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24 uint index;
2
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25 }
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26
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27 this (void[] input_=null) {
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28 buffer = new ubyte[blockSize];
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29 ubyte[] input = cast(ubyte[]) input_;
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30 if (input)
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31 update(input);
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32 }
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33
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34 /** Returns: The block size of the hash function in bytes. */
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35 abstract uint blockSize();
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36
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37 /** Returns: The output size of the hash function in bytes. */
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38 abstract uint digestSize();
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39
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40 /** Returns: The name of the algorithm we're implementing. */
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41 abstract char[] name();
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42
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43 /** Returns: A copy of this hash object. */
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44 abstract Hash copy();
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45
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46 /**
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47 * Introduce data into the hash function.
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48 *
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49 * Params:
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50 * input_ = Data to be processed.
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51 *
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52 * Returns: Self
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53 */
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54 Hash update(void[] input_) {
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55 ubyte[] input = cast(ubyte[]) input_;
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56 foreach (ubyte i; input) {
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57 bytes++;
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58 buffer[index++] = i;
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59 if (index == blockSize) {
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60 transform(buffer);
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61 index = 0;
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62 }
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63 }
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64 return this;
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65 }
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66
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67 /** Hash function's internal transformation. */
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68 protected abstract void transform(ubyte[] input);
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69
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70 /**
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71 * Pad message in the respective manner.
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72 *
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73 * Params:
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74 * mode = Mode constant dictating in which manner
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75 * to pad the message.
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76 */
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77 protected void padMessage(uint mode) {
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78 ulong bits = bytes << 3;
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79
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80 // Add the pad marker
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81 buffer[index++] = ((mode == MODE_TIGER) ? 0x01 : 0x80);
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82 if (index == blockSize) {
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83 transform(buffer);
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84 index = 0;
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85 }
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86
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87 // Pad with null bytes
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88 if (index >= (blockSize-(blockSize >> 3)))
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89 update(new ubyte[blockSize-index]);
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90 update(new ubyte[(blockSize-ulong.sizeof)-index]);
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91
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92 // Length padding
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93 ubyte[] length = new ubyte[ulong.sizeof];
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94 for (int i = 0, j = 0; i < 64; i+=8) // little endian
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95 length[j++] = bits >> i;
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96 if (mode == MODE_SHA)
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97 length.reverse; // big endian
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98 update(length);
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99 }
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100
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101 /**
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102 * Process all data, pad and finalize. This method will
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103 * reset the digest to its original state ofr subsequent use.
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104 *
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105 * Returns: Binary representation of the hash in bytes.
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106 */
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107 abstract ubyte[] digest();
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108
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109 /**
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110 * Same as digest() but returns hash value in hex.
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111 *
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112 * Returns: Representation of the final hash value in hex.
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113 */
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114 char[] hexDigest() {
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115 return Util.ubytesToHex(digest());
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116 }
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117
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118 /** Reset hash to initial state. */
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119 void reset() {
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120 bytes = index = 0;
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121 }
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122 }