1 | // |
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2 | // MD2Engine.cpp |
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3 | // |
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4 | // $Id: //poco/1.3/Foundation/src/MD2Engine.cpp#2 $ |
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5 | // |
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6 | // Library: Foundation |
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7 | // Package: Crypt |
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8 | // Module: MD2Engine |
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9 | // |
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10 | // Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH. |
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11 | // and Contributors. |
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12 | // |
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13 | // Permission is hereby granted, free of charge, to any person or organization |
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14 | // obtaining a copy of the software and accompanying documentation covered by |
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15 | // this license (the "Software") to use, reproduce, display, distribute, |
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16 | // execute, and transmit the Software, and to prepare derivative works of the |
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17 | // Software, and to permit third-parties to whom the Software is furnished to |
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18 | // do so, all subject to the following: |
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19 | // |
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20 | // The copyright notices in the Software and this entire statement, including |
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21 | // the above license grant, this restriction and the following disclaimer, |
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22 | // must be included in all copies of the Software, in whole or in part, and |
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23 | // all derivative works of the Software, unless such copies or derivative |
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24 | // works are solely in the form of machine-executable object code generated by |
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25 | // a source language processor. |
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26 | // |
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27 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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28 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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29 | // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
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30 | // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
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31 | // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
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32 | // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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33 | // DEALINGS IN THE SOFTWARE. |
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34 | // |
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35 | // |
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36 | // MD2 (RFC 1319) algorithm: |
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37 | // Copyright (C) 1990-2, RSA Data Security, Inc. Created 1990. All |
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38 | // rights reserved. |
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39 | // |
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40 | // License to copy and use this software is granted for |
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41 | // non-commercial Internet Privacy-Enhanced Mail provided that it is |
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42 | // identified as the "RSA Data Security, Inc. MD2 Message Digest |
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43 | // Algorithm" in all material mentioning or referencing this software |
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44 | // or this function. |
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45 | // |
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46 | // RSA Data Security, Inc. makes no representations concerning either |
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47 | // the merchantability of this software or the suitability of this |
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48 | // software for any particular purpose. It is provided "as is" |
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49 | // without express or implied warranty of any kind. |
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50 | // |
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51 | // These notices must be retained in any copies of any part of this |
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52 | // documentation and/or software. |
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53 | // |
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54 | |
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55 | |
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56 | #include "Poco/MD2Engine.h" |
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57 | #include <cstring> |
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58 | |
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59 | |
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60 | namespace Poco { |
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61 | |
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62 | |
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63 | MD2Engine::MD2Engine() |
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64 | { |
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65 | _digest.reserve(16); |
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66 | reset(); |
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67 | } |
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68 | |
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69 | |
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70 | MD2Engine::~MD2Engine() |
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71 | { |
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72 | reset(); |
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73 | } |
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74 | |
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75 | |
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76 | void MD2Engine::updateImpl(const void* input_, unsigned inputLen) |
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77 | { |
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78 | const unsigned char* input = (const unsigned char*) input_; |
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79 | unsigned int i, index, partLen; |
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80 | |
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81 | /* Update number of bytes mod 16 */ |
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82 | index = _context.count; |
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83 | _context.count = (index + inputLen) & 0xf; |
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84 | |
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85 | partLen = 16 - index; |
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86 | |
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87 | /* Transform as many times as possible. */ |
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88 | if (inputLen >= partLen) |
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89 | { |
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90 | std::memcpy(&_context.buffer[index], input, partLen); |
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91 | transform(_context.state, _context.checksum, _context.buffer); |
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92 | |
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93 | for (i = partLen; i + 15 < inputLen; i += 16) |
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94 | transform(_context.state, _context.checksum, &input[i]); |
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95 | |
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96 | index = 0; |
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97 | } |
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98 | else i = 0; |
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99 | |
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100 | /* Buffer remaining input */ |
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101 | std::memcpy(&_context.buffer[index], &input[i], inputLen-i); |
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102 | } |
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103 | |
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104 | |
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105 | unsigned MD2Engine::digestLength() const |
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106 | { |
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107 | return DIGEST_SIZE; |
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108 | } |
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109 | |
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110 | |
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111 | void MD2Engine::reset() |
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112 | { |
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113 | std::memset(&_context, 0, sizeof(_context)); |
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114 | } |
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115 | |
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116 | |
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117 | const DigestEngine::Digest& MD2Engine::digest() |
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118 | { |
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119 | static const unsigned char* PADDING[] = |
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120 | { |
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121 | (unsigned char*) "", |
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122 | (unsigned char*) "\001", |
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123 | (unsigned char*) "\002\002", |
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124 | (unsigned char*) "\003\003\003", |
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125 | (unsigned char*) "\004\004\004\004", |
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126 | (unsigned char*) "\005\005\005\005\005", |
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127 | (unsigned char*) "\006\006\006\006\006\006", |
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128 | (unsigned char*) "\007\007\007\007\007\007\007", |
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129 | (unsigned char*) "\010\010\010\010\010\010\010\010", |
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130 | (unsigned char*) "\011\011\011\011\011\011\011\011\011", |
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131 | (unsigned char*) "\012\012\012\012\012\012\012\012\012\012", |
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132 | (unsigned char*) "\013\013\013\013\013\013\013\013\013\013\013", |
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133 | (unsigned char*) "\014\014\014\014\014\014\014\014\014\014\014\014", |
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134 | (unsigned char*) "\015\015\015\015\015\015\015\015\015\015\015\015\015", |
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135 | (unsigned char *) "\016\016\016\016\016\016\016\016\016\016\016\016\016\016", |
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136 | (unsigned char *) "\017\017\017\017\017\017\017\017\017\017\017\017\017\017\017", |
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137 | (unsigned char *) "\020\020\020\020\020\020\020\020\020\020\020\020\020\020\020\020" |
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138 | }; |
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139 | unsigned int index, padLen; |
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140 | |
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141 | /* Pad out to multiple of 16. */ |
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142 | index = _context.count; |
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143 | padLen = 16 - index; |
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144 | update((const char*) PADDING[padLen], padLen); |
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145 | |
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146 | /* Extend with checksum */ |
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147 | update((const char*) _context.checksum, 16); |
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148 | |
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149 | /* Store state in digest */ |
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150 | _digest.clear(); |
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151 | _digest.insert(_digest.begin(), _context.state, _context.state + 16); |
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152 | |
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153 | /* Zeroize sensitive information. */ |
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154 | std::memset(&_context, 0, sizeof(_context)); |
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155 | reset(); |
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156 | return _digest; |
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157 | } |
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158 | |
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159 | |
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160 | void MD2Engine::transform(unsigned char state[16], unsigned char checksum[16], const unsigned char block[16]) |
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161 | { |
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162 | // Permutation of 0..255 constructed from the digits of pi. It gives a |
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163 | // "random" nonlinear byte substitution operation. |
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164 | static const unsigned char PI_SUBST[256] = |
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165 | { |
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166 | 41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6, |
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167 | 19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188, |
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168 | 76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24, |
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169 | 138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251, |
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170 | 245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63, |
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171 | 148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50, |
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172 | 39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165, |
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173 | 181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210, |
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174 | 150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157, |
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175 | 112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27, |
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176 | 96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15, |
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177 | 85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197, |
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178 | 234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65, |
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179 | 129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123, |
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180 | 8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233, |
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181 | 203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228, |
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182 | 166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237, |
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183 | 31, 26, 219, 153, 141, 51, 159, 17, 131, 20 |
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184 | }; |
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185 | unsigned int i, j, t; |
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186 | unsigned char x[48]; |
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187 | |
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188 | /* Form encryption block from state, block, state ^ block. */ |
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189 | std::memcpy(x, state, 16); |
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190 | std::memcpy(x+16, block, 16); |
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191 | for (i = 0; i < 16; i++) |
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192 | x[i+32] = state[i] ^ block[i]; |
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193 | |
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194 | /* Encrypt block (18 rounds). */ |
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195 | t = 0; |
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196 | for (i = 0; i < 18; i++) |
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197 | { |
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198 | for (j = 0; j < 48; j++) |
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199 | t = x[j] ^= PI_SUBST[t]; |
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200 | t = (t + i) & 0xff; |
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201 | } |
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202 | |
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203 | /* Save new state */ |
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204 | std::memcpy(state, x, 16); |
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205 | |
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206 | /* Update checksum. */ |
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207 | t = checksum[15]; |
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208 | for (i = 0; i < 16; i++) |
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209 | t = checksum[i] ^= PI_SUBST[block[i] ^ t]; |
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210 | |
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211 | /* Zeroize sensitive information. */ |
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212 | std::memset(x, 0, sizeof(x)); |
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213 | } |
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214 | |
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215 | |
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216 | } // namespace Poco |
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