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annotate AES/rijndael.h @ 1:0b3630a29ad8

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Initial version based on previous repository. Project was ported to QT6 and in now cmake based.
author Ideenmodellierer <tiefenrauscher@web.de>
date Thu, 27 Nov 2025 18:40:28 +0100
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1 //////////////////////////////////////////////////////////////////////////////
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2 /// \file rijndael.h
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3 /// \brief Public Domain AES encryption/decryption
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4 /// \author Philip J. Erdelsky <pje@efgh.com>, JD Gascuel, and others.
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5 ///
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6 /// \copyright (c) 2015 JD Gascuel. All rights reserved.
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7 /// $Id$
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8 //////////////////////////////////////////////////////////////////////////////
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9 //
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10 // BSD 2-Clause License:
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11 //
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12 // Redistribution and use in source and binary forms, with or without
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13 // modification, are permitted provided that the following conditions
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14 // are met:
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15 //
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16 // 1. Redistributions of source code must retain the above copyright notice,
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17 // this list of conditions and the following disclaimer.
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18 //
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19 // 2. Redistributions in binary form must reproduce the above copyright notice,
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20 // this list of conditions and the following disclaimer in the documentation
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21 // and/or other materials provided with the distribution.
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22 //
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23 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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24 // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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25 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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26 // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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27 // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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28 // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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29 // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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30 // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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31 // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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32 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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33 // THE POSSIBILITY OF SUCH DAMAGE.
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34 //
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35 //////////////////////////////////////////////////////////////////////////////
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36 // HISTORY
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37 // 2002-09-03 PJE: original source http://www.efgh.com/software/rijndael.htm
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38 // 2015-03-14 jDG: Import into OSTC_Companion, major C++ rewrites to insure
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39 // key length is not messed up. Added ECb and CFB modes.
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40
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41 #ifndef RIJNDAEL_H
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42 #define RIJNDAEL_H
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43
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44 namespace Rijndael {
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45
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46 #define KEYLENGTH(keybits) ((keybits)/8)
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47 #define RKLENGTH(keybits) ((keybits)/8+28)
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48 #define NROUNDS(keybits) ((keybits)/32+6)
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49
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50 typedef unsigned long Word32;
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51 typedef unsigned char Byte;
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52 typedef Byte Block[16];
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53
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54 //////////////////////////////////////////////////////////////////////////////
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55 /// \brief Public Domain AES encryption/decryption rewritten.
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56 ///
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57 /// The Rijndael encryption algorithm has been designed to replace the aging
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58 /// DES algorithm. Like DES, it is a block cipher. It uses 128-bit, 192-bit
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59 /// or 256-bit keys. This implementation encrypts 128-bit blocks.
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60 /// (DES used 56-bit keys and 64-bit blocks.)
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61 ///
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62 /// The code in this package is a modified version of an implementation
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63 /// placed in the public domain by the following persons:
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64 /// + Vincent Rijmen vincent.rijmen@esat.kuleuven.ac.be
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65 /// + Antoon Bosselaers antoon.bosselaers@esat.kuleuven.ac.be
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66 /// + Paulo Barreto paulo.barreto@terra.com.br
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67 ///
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68 /// See details in http://www.efgh.com/software/rijndael.htm
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69 ///
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70 struct AES
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71 {
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72 static void setupEncrypt(Word32* rk, const Byte *key, int keybits);
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73 static void setupDecrypt(Word32* rk, const Byte *key, int keybits);
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74 static void encrypt(Word32 *rk, int nrounds, const Block plaintext, Block ciphertext);
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75 static void decrypt(Word32 *rk, int nrounds, const Block ciphertext, Block plaintext);
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76 static Word32 get_random(Word32 *rk, int keybits);
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77 };
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78
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79 //////////////////////////////////////////////////////////////////////////////
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80 template<int keybits>
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81 class ECB : private AES
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82 {
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83 /// \brief Internal state
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84 ///
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85 /// storage for encryption buffer, required space:
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86 /// keybits 32-bit words required
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87 /// 128 44
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88 /// 192 52
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89 /// 256 60
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90 /// \sa RKLENGTH macro.
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91 Word32 rk[RKLENGTH(keybits)];
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92
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93 public:
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94 typedef Byte Key[KEYLENGTH(keybits)];
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95
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96 ECB();
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97
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98 //------------------------------------------------------------------------
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99 /// \brief Initialize encryption state
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100 ///
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101 ///
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102 /// \param[in] key: AES key, where length is:
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103 /// keybits number of bytes
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104 /// 128 16
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105 /// 192 24
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106 /// 256 32
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107 /// \sa KEYLENGTH macro.
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108 ///
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109 /// \code
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110 /// Rijndael::ECB<128>::Key key = "my big secret";
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111 /// Rijndael::ECB<128> enc;
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112 /// enc.setupEncrypt(key);
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113 /// ...
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114 /// Rijndael::Block plain = "Hello World!";
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115 /// Rijndael::Block result;
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116 /// enc.encrypt(plain, result);
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117 /// \endcode
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118 void setupEncrypt(const Key key);
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119
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120 //------------------------------------------------------------------------
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121 /// \brief Encrypt a block of 16 bytes.
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122 ///
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123 /// \param[in] plaintext: The 16 bytes block to encrypt.
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124 /// \param[out] ciphertext: Space to store the 16 bytes of encrypted data.
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125 ///
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126 void encrypt(const Block plaintext, Block ciphertext);
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127
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128 //------------------------------------------------------------------------
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129 /// \brief Initialize decryption state.
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130 ///
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131 /// \param[in] key: AES key, where length is:
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132 /// keybits number of bytes
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133 /// 128 16
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134 /// 192 24
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135 /// 256 32
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136 /// \sa KEYLENGTH macro.
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137 ///
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138 /// \code
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139 /// Rijndael::ECB<128>::Key key = "my big secret";
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140 /// Rijndael::ECB<128> dec;
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141 /// dec.setupDecrypt(key);
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142 /// ...
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143 /// Rijndael::Block cipher = ...;
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144 /// Rijndael::Block result;
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145 /// Rijndael::decrypt(cipher, result);
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146 /// \endcode
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147 void setupDecrypt(const Key key);
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148
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149 //------------------------------------------------------------------------
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150 /// \brief Decrypt a block of 16 bytes.
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151 ///
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152 /// \param[in] ciphertext: The 16 bytes block of data to decrypt.
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153 /// \param[out] plaintext: Space to store the 16 bytes result block.
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154 ///
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155 void decrypt(const Block ciphertext, Block plaintext);
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156
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157 //----------------------------------------------------------------------------
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158 /// \brief Crypto base PRNG
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159 ///
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160 /// Based on wall-clock value and current key, but should be a crypto-secure
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161 /// generator.
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162 Word32 get_random();
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163 };
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164
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165 //////////////////////////////////////////////////////////////////////////////
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166 template<int keybits>
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167 class CFB : public ECB<keybits>
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168 {
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169 /// Initialization vector (salt), updated in CFB mode
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170 /// for the next block of text.
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171 Block iv;
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172
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173 public:
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174 typedef Byte Key[KEYLENGTH(keybits)];
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175 typedef Block IV;
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176
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177 //------------------------------------------------------------------------
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178 /// \brief Initialize encryption/decription state
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179 ///
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180 ///
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181 /// \param[in] key: AES key, where length is:
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182 /// keybits number of bytes
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183 /// 128 16
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184 /// 192 24
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185 /// 256 32
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186 /// \sa KEYLENGTH macro.
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187 /// \param[in] iv: initialization vector. Some randomness needed to
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188 /// enforce the sequence is non replayable.
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189 ///
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190 /// \code
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191 /// Rijndael::CFB<128>::Key key = "my big secret";
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192 /// Rijndael::CFB<128> enc(key, iv);
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193 /// ...
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194 /// Rijndael::Block plain = "Hello World!";
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195 /// Rijndael::Block cipher, again;
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196 /// enc.encrypt(plain, cipher);
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197 /// enc.decrypt(cipher, again);
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198 /// \endcode
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199 CFB(const Key key, const IV iv);
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200
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201 //------------------------------------------------------------------------
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202 /// \brief Encrypt a block of 16 bytes, with IV (CFB mode)
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203 ///
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204 /// \param[in] plaintext: The 16 bytes block to encrypt.
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205 /// \param[out] ciphertext: Space to store the 16 bytes of encrypted data.
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206 ///
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207 void encrypt(const Block plaintext, Block ciphertext);
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208
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209 //----------------------------------------------------------------------------
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210 /// \brief Decrypt a block of 16 bytes, with IV (CFB mode)
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211 ///
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212 /// \param[in] ciphertext: The 16 bytes block of data to decrypt.
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213 /// \param[out] plaintext: Space to store the 16 bytes result block.
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214 ///
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215 void decrypt(const Block ciphertext, Block plaintext);
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216 };
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217
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218 //////////////////////////////////////////////////////////////////////////////
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219
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220 template<int keybits>
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221 ECB<keybits>::ECB()
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222 {
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223 for(int i=0; i<RKLENGTH(keybits); ++i)
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224 rk[i] = 0;
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225 }
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226
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227 template<int keybits>
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228 void ECB<keybits>::setupEncrypt(const Key key)
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229 {
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230 AES::setupEncrypt(rk, key, keybits);
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231 }
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232
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233 template<int keybits>
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234 void ECB<keybits>::encrypt(const Block plaintext, Block ciphertext)
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235 {
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236 AES::encrypt(rk, NROUNDS(keybits), plaintext, ciphertext);
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237 }
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238
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239 //////////////////////////////////////////////////////////////////////////////
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240
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241 template<int keybits>
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242 void ECB<keybits>::setupDecrypt(const Key key)
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243 {
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244 AES::setupDecrypt(rk, key, keybits);
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245 }
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246
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247 template<int keybits>
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248 void ECB<keybits>::decrypt(const Block ciphertext, Block plaintext)
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249 {
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250 AES::decrypt(rk, NROUNDS(keybits), ciphertext, plaintext);
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251 }
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252
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253 //////////////////////////////////////////////////////////////////////////////
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254
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255 template<int keybits>
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256 Word32 ECB<keybits>::get_random()
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257 {
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258 return AES::get_random(rk, keybits);
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259 }
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260
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261 //////////////////////////////////////////////////////////////////////////////
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262
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263 template<int keybits>
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264 CFB<keybits>::CFB(const Key key, const IV _iv)
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265 {
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266 ECB<keybits>::setupEncrypt(key);
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267 for(int i=0; i<16; ++i)
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268 iv[i] = _iv[i];
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269 }
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270
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271 template<int keybits>
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272 void CFB<keybits>::encrypt(const Block plaintext, Block ciphertext)
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273 {
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274 Block tmp;
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275 ECB<keybits>::encrypt(iv, tmp);
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276 for(int i=0; i<16; ++i)
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277 {
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278 ciphertext[i] = plaintext[i] ^ tmp[i];
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279 iv[i] = ciphertext[i];
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280 }
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281 }
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282
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283 template<int keybits>
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284 void CFB<keybits>::decrypt(const Block ciphertext, Block plaintext)
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285 {
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286 Block tmp;
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287 ECB<keybits>::encrypt(iv, tmp);
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288 for(int i=0; i<16; ++i)
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289 {
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290 plaintext[i] = ciphertext[i] ^ tmp[i];
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291 iv[i] = ciphertext[i];
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292 }
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293 }
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294
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295 }
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296 #endif // RIJNDAEL_H