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annotate dcrypt/crypto/Hash.d @ 27:8b5eaf3c2979

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Fixed error in hash message padding reported by Glenn Haecker.
author Thomas Dixon <reikon@reikon.us>
date Sat, 09 May 2009 23:29:20 -0400
parents 4589f8c5eb3c
children ad687db713a4
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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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4589f8c5eb3c Replaced dcrypt.crypto.Util with dcrypt.misc.Bitwise and dcrypt.misc.ByteConverter. Altered all dependent files to reflect changes.
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11 public import dcrypt.misc.ByteConverter;
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12 public import dcrypt.misc.Bitwise;
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13
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14 /** Base class for all cryptographic hash functions */
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15 class Hash
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16 {
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17 private const enum
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18 {
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19 MODE_MD=0, // MDx, RipeMD, etc
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20 MODE_SHA,
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21 MODE_TIGER
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22 }
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23
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24 protected
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25 {
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26 ubyte[] buffer;
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27 ulong bytes;
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28 uint index;
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29 }
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30
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31 this (void[] input_=null)
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32 {
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33 buffer = new ubyte[blockSize];
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34 ubyte[] input = cast(ubyte[]) input_;
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35 if (input)
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36 update(input);
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37 }
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38
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39 /** Returns: The block size of the hash function in bytes. */
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40 abstract uint blockSize();
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41
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42 /** Returns: The output size of the hash function in bytes. */
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43 abstract uint digestSize();
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44
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45 /** Returns: The name of the algorithm we're implementing. */
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46 abstract char[] name();
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47
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48 /** Returns: A copy of this hash object. */
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49 abstract Hash copy();
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50
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51 /**
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52 * Introduce data into the hash function.
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53 *
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54 * Params:
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55 * input_ = Data to be processed.
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56 *
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57 * Returns: Self
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58 */
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59 Hash update(void[] input_)
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60 {
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61 ubyte[] input = cast(ubyte[]) input_;
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62 foreach (ubyte i; input)
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63 {
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64 bytes++;
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65 buffer[index++] = i;
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66 if (index == blockSize)
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67 {
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68 transform(buffer);
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69 index = 0;
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70 }
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71 }
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72
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73 return this;
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74 }
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75
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76 /** Hash function's internal transformation. */
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77 protected abstract void transform(ubyte[] input);
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78
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79 /**
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80 * Pad message in the respective manner.
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81 *
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82 * Params:
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83 * mode = Mode constant dictating in which manner
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84 * to pad the message.
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85 */
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86 protected void padMessage(uint mode)
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87 {
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88 ulong bits = bytes << 3;
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89
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90 // Add the pad marker
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91 buffer[index++] = ((mode == MODE_TIGER) ? 0x01 : 0x80);
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92 if (index == blockSize)
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93 {
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94 transform(buffer);
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95 index = 0;
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96 }
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97
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98 // Pad with null bytes
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99 while ((index & (blockSize - 1)) != (blockSize - long.sizeof))
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100 {
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101 buffer[index++] = 0;
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102
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103 if (index == blockSize)
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104 {
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105 transform(buffer);
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106 index = 0;
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107 }
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108 }
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109
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110 // Length padding
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111 for (int i = 0; i < 64; i+=8) // little endian
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112 buffer[index++] = bits >> i;
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113
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114 if (mode == MODE_SHA)
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115 buffer[index-ulong.sizeof..index].reverse; // big endian
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116
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117 transform(buffer);
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118 index = 0;
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119 }
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120
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121 /**
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122 * Process all data, pad and finalize. This method will
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5ce3012f1def 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.
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123 * reset the digest to its original state for subsequent use.
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124 *
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125 * Returns: Binary representation of the hash in bytes.
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126 */
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127 abstract ubyte[] digest();
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128
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129 /**
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130 * Same as digest() but returns hash value in hex.
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131 *
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132 * Returns: Representation of the final hash value in hex.
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133 */
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134 char[] hexDigest()
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135 {
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4589f8c5eb3c Replaced dcrypt.crypto.Util with dcrypt.misc.Bitwise and dcrypt.misc.ByteConverter. Altered all dependent files to reflect changes.
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136 return ByteConverter.hexEncode(digest());
0
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137 }
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138
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139 /** Reset hash to initial state. */
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140 void reset()
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141 {
0
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142 bytes = index = 0;
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143 }
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144 }