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827 | daniel-mar | 1 | <?php |
2 | |||
3 | /** |
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4 | * Pure-PHP implementation of Rijndael. |
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5 | * |
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6 | * Uses mcrypt, if available/possible, and an internal implementation, otherwise. |
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7 | * |
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8 | * PHP version 5 |
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9 | * |
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10 | * If {@link self::setBlockLength() setBlockLength()} isn't called, it'll be assumed to be 128 bits. If |
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11 | * {@link self::setKeyLength() setKeyLength()} isn't called, it'll be calculated from |
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12 | * {@link self::setKey() setKey()}. ie. if the key is 128-bits, the key length will be 128-bits. If it's |
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13 | * 136-bits it'll be null-padded to 192-bits and 192 bits will be the key length until |
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14 | * {@link self::setKey() setKey()} is called, again, at which point, it'll be recalculated. |
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15 | * |
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16 | * Not all Rijndael implementations may support 160-bits or 224-bits as the block length / key length. mcrypt, for example, |
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17 | * does not. AES, itself, only supports block lengths of 128 and key lengths of 128, 192, and 256. |
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18 | * {@link http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=10 Rijndael-ammended.pdf#page=10} defines the |
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19 | * algorithm for block lengths of 192 and 256 but not for block lengths / key lengths of 160 and 224. Indeed, 160 and 224 |
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20 | * are first defined as valid key / block lengths in |
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21 | * {@link http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=44 Rijndael-ammended.pdf#page=44}: |
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22 | * Extensions: Other block and Cipher Key lengths. |
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23 | * Note: Use of 160/224-bit Keys must be explicitly set by setKeyLength(160) respectively setKeyLength(224). |
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24 | * |
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25 | * {@internal The variable names are the same as those in |
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26 | * {@link http://www.csrc.nist.gov/publications/fips/fips197/fips-197.pdf#page=10 fips-197.pdf#page=10}.}} |
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27 | * |
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28 | * Here's a short example of how to use this library: |
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29 | * <code> |
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30 | * <?php |
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31 | * include 'vendor/autoload.php'; |
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32 | * |
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33 | * $rijndael = new \phpseclib3\Crypt\Rijndael('ctr'); |
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34 | * |
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35 | * $rijndael->setKey('abcdefghijklmnop'); |
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36 | * |
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37 | * $size = 10 * 1024; |
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38 | * $plaintext = ''; |
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39 | * for ($i = 0; $i < $size; $i++) { |
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40 | * $plaintext.= 'a'; |
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41 | * } |
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42 | * |
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43 | * echo $rijndael->decrypt($rijndael->encrypt($plaintext)); |
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44 | * ?> |
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45 | * </code> |
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46 | * |
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874 | daniel-mar | 47 | * @category Crypt |
48 | * @package Rijndael |
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827 | daniel-mar | 49 | * @author Jim Wigginton <terrafrost@php.net> |
50 | * @copyright 2008 Jim Wigginton |
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51 | * @license http://www.opensource.org/licenses/mit-license.html MIT License |
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52 | * @link http://phpseclib.sourceforge.net |
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53 | */ |
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54 | |||
55 | namespace phpseclib3\Crypt; |
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56 | |||
57 | use phpseclib3\Common\Functions\Strings; |
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58 | use phpseclib3\Crypt\Common\BlockCipher; |
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59 | use phpseclib3\Exception\BadDecryptionException; |
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60 | use phpseclib3\Exception\BadModeException; |
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61 | use phpseclib3\Exception\InconsistentSetupException; |
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62 | use phpseclib3\Exception\InsufficientSetupException; |
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63 | |||
64 | /** |
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65 | * Pure-PHP implementation of Rijndael. |
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66 | * |
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874 | daniel-mar | 67 | * @package Rijndael |
827 | daniel-mar | 68 | * @author Jim Wigginton <terrafrost@php.net> |
874 | daniel-mar | 69 | * @access public |
827 | daniel-mar | 70 | */ |
71 | class Rijndael extends BlockCipher |
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72 | { |
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73 | /** |
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74 | * The mcrypt specific name of the cipher |
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75 | * |
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76 | * Mcrypt is useable for 128/192/256-bit $block_size/$key_length. For 160/224 not. |
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77 | * \phpseclib3\Crypt\Rijndael determines automatically whether mcrypt is useable |
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78 | * or not for the current $block_size/$key_length. |
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79 | * In case of, $cipher_name_mcrypt will be set dynamically at run time accordingly. |
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80 | * |
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81 | * @see \phpseclib3\Crypt\Common\SymmetricKey::cipher_name_mcrypt |
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82 | * @see \phpseclib3\Crypt\Common\SymmetricKey::engine |
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83 | * @see self::isValidEngine() |
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84 | * @var string |
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874 | daniel-mar | 85 | * @access private |
827 | daniel-mar | 86 | */ |
87 | protected $cipher_name_mcrypt = 'rijndael-128'; |
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88 | |||
89 | /** |
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90 | * The Key Schedule |
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91 | * |
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92 | * @see self::setup() |
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93 | * @var array |
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874 | daniel-mar | 94 | * @access private |
827 | daniel-mar | 95 | */ |
96 | private $w; |
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97 | |||
98 | /** |
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99 | * The Inverse Key Schedule |
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100 | * |
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101 | * @see self::setup() |
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102 | * @var array |
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874 | daniel-mar | 103 | * @access private |
827 | daniel-mar | 104 | */ |
105 | private $dw; |
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106 | |||
107 | /** |
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108 | * The Block Length divided by 32 |
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109 | * |
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110 | * {@internal The max value is 256 / 32 = 8, the min value is 128 / 32 = 4. Exists in conjunction with $block_size |
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111 | * because the encryption / decryption / key schedule creation requires this number and not $block_size. We could |
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112 | * derive this from $block_size or vice versa, but that'd mean we'd have to do multiple shift operations, so in lieu |
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113 | * of that, we'll just precompute it once.} |
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114 | * |
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115 | * @see self::setBlockLength() |
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116 | * @var int |
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874 | daniel-mar | 117 | * @access private |
827 | daniel-mar | 118 | */ |
119 | private $Nb = 4; |
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120 | |||
121 | /** |
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122 | * The Key Length (in bytes) |
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123 | * |
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124 | * {@internal The max value is 256 / 8 = 32, the min value is 128 / 8 = 16. Exists in conjunction with $Nk |
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125 | * because the encryption / decryption / key schedule creation requires this number and not $key_length. We could |
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126 | * derive this from $key_length or vice versa, but that'd mean we'd have to do multiple shift operations, so in lieu |
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127 | * of that, we'll just precompute it once.} |
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128 | * |
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129 | * @see self::setKeyLength() |
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130 | * @var int |
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874 | daniel-mar | 131 | * @access private |
827 | daniel-mar | 132 | */ |
133 | protected $key_length = 16; |
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134 | |||
135 | /** |
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136 | * The Key Length divided by 32 |
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137 | * |
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138 | * @see self::setKeyLength() |
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139 | * @var int |
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874 | daniel-mar | 140 | * @access private |
827 | daniel-mar | 141 | * @internal The max value is 256 / 32 = 8, the min value is 128 / 32 = 4 |
142 | */ |
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143 | private $Nk = 4; |
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144 | |||
145 | /** |
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146 | * The Number of Rounds |
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147 | * |
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148 | * {@internal The max value is 14, the min value is 10.} |
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149 | * |
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150 | * @var int |
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874 | daniel-mar | 151 | * @access private |
827 | daniel-mar | 152 | */ |
153 | private $Nr; |
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154 | |||
155 | /** |
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156 | * Shift offsets |
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157 | * |
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158 | * @var array |
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874 | daniel-mar | 159 | * @access private |
827 | daniel-mar | 160 | */ |
161 | private $c; |
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162 | |||
163 | /** |
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164 | * Holds the last used key- and block_size information |
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165 | * |
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166 | * @var array |
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874 | daniel-mar | 167 | * @access private |
827 | daniel-mar | 168 | */ |
169 | private $kl; |
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170 | |||
171 | /** |
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172 | * Default Constructor. |
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173 | * |
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174 | * @param string $mode |
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874 | daniel-mar | 175 | * @access public |
827 | daniel-mar | 176 | * @throws \InvalidArgumentException if an invalid / unsupported mode is provided |
177 | */ |
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178 | public function __construct($mode) |
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179 | { |
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180 | parent::__construct($mode); |
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181 | |||
182 | if ($this->mode == self::MODE_STREAM) { |
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183 | throw new BadModeException('Block ciphers cannot be ran in stream mode'); |
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184 | } |
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185 | } |
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186 | |||
187 | /** |
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188 | * Sets the key length. |
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189 | * |
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190 | * Valid key lengths are 128, 160, 192, 224, and 256. |
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191 | * |
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192 | * Note: phpseclib extends Rijndael (and AES) for using 160- and 224-bit keys but they are officially not defined |
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193 | * and the most (if not all) implementations are not able using 160/224-bit keys but round/pad them up to |
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194 | * 192/256 bits as, for example, mcrypt will do. |
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195 | * |
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196 | * That said, if you want be compatible with other Rijndael and AES implementations, |
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197 | * you should not setKeyLength(160) or setKeyLength(224). |
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198 | * |
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199 | * Additional: In case of 160- and 224-bit keys, phpseclib will/can, for that reason, not use |
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200 | * the mcrypt php extension, even if available. |
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201 | * This results then in slower encryption. |
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202 | * |
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874 | daniel-mar | 203 | * @access public |
827 | daniel-mar | 204 | * @throws \LengthException if the key length is invalid |
205 | * @param int $length |
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206 | */ |
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207 | public function setKeyLength($length) |
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208 | { |
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209 | switch ($length) { |
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210 | case 128: |
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211 | case 160: |
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212 | case 192: |
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213 | case 224: |
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214 | case 256: |
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215 | $this->key_length = $length >> 3; |
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216 | break; |
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217 | default: |
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218 | throw new \LengthException('Key size of ' . $length . ' bits is not supported by this algorithm. Only keys of sizes 128, 160, 192, 224 or 256 bits are supported'); |
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219 | } |
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220 | |||
221 | parent::setKeyLength($length); |
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222 | } |
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223 | |||
224 | /** |
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225 | * Sets the key. |
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226 | * |
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227 | * Rijndael supports five different key lengths |
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228 | * |
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229 | * @see setKeyLength() |
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874 | daniel-mar | 230 | * @access public |
827 | daniel-mar | 231 | * @param string $key |
232 | * @throws \LengthException if the key length isn't supported |
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233 | */ |
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234 | public function setKey($key) |
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235 | { |
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236 | switch (strlen($key)) { |
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237 | case 16: |
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238 | case 20: |
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239 | case 24: |
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240 | case 28: |
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241 | case 32: |
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242 | break; |
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243 | default: |
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244 | throw new \LengthException('Key of size ' . strlen($key) . ' not supported by this algorithm. Only keys of sizes 16, 20, 24, 28 or 32 are supported'); |
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245 | } |
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246 | |||
247 | parent::setKey($key); |
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248 | } |
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249 | |||
250 | /** |
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251 | * Sets the block length |
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252 | * |
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253 | * Valid block lengths are 128, 160, 192, 224, and 256. |
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254 | * |
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874 | daniel-mar | 255 | * @access public |
827 | daniel-mar | 256 | * @param int $length |
257 | */ |
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258 | public function setBlockLength($length) |
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259 | { |
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260 | switch ($length) { |
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261 | case 128: |
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262 | case 160: |
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263 | case 192: |
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264 | case 224: |
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265 | case 256: |
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266 | break; |
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267 | default: |
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268 | throw new \LengthException('Key size of ' . $length . ' bits is not supported by this algorithm. Only keys of sizes 128, 160, 192, 224 or 256 bits are supported'); |
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269 | } |
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270 | |||
271 | $this->Nb = $length >> 5; |
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272 | $this->block_size = $length >> 3; |
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273 | $this->changed = $this->nonIVChanged = true; |
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274 | $this->setEngine(); |
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275 | } |
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276 | |||
277 | /** |
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278 | * Test for engine validity |
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279 | * |
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280 | * This is mainly just a wrapper to set things up for \phpseclib3\Crypt\Common\SymmetricKey::isValidEngine() |
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281 | * |
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282 | * @see \phpseclib3\Crypt\Common\SymmetricKey::__construct() |
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283 | * @param int $engine |
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874 | daniel-mar | 284 | * @access protected |
827 | daniel-mar | 285 | * @return bool |
286 | */ |
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287 | protected function isValidEngineHelper($engine) |
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288 | { |
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289 | switch ($engine) { |
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290 | case self::ENGINE_LIBSODIUM: |
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291 | return function_exists('sodium_crypto_aead_aes256gcm_is_available') && |
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292 | sodium_crypto_aead_aes256gcm_is_available() && |
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293 | $this->mode == self::MODE_GCM && |
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294 | $this->key_length == 32 && |
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295 | $this->nonce && strlen($this->nonce) == 12 && |
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296 | $this->block_size == 16; |
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297 | case self::ENGINE_OPENSSL_GCM: |
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298 | if (!extension_loaded('openssl')) { |
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299 | return false; |
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300 | } |
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301 | $methods = openssl_get_cipher_methods(); |
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302 | return $this->mode == self::MODE_GCM && |
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303 | version_compare(PHP_VERSION, '7.1.0', '>=') && |
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304 | in_array('aes-' . $this->getKeyLength() . '-gcm', $methods) && |
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305 | $this->block_size == 16; |
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306 | case self::ENGINE_OPENSSL: |
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307 | if ($this->block_size != 16) { |
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308 | return false; |
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309 | } |
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310 | $this->cipher_name_openssl_ecb = 'aes-' . ($this->key_length << 3) . '-ecb'; |
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311 | $this->cipher_name_openssl = 'aes-' . ($this->key_length << 3) . '-' . $this->openssl_translate_mode(); |
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312 | break; |
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313 | case self::ENGINE_MCRYPT: |
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314 | $this->cipher_name_mcrypt = 'rijndael-' . ($this->block_size << 3); |
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315 | if ($this->key_length % 8) { // is it a 160/224-bit key? |
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316 | // mcrypt is not usable for them, only for 128/192/256-bit keys |
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317 | return false; |
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318 | } |
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319 | } |
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320 | |||
321 | return parent::isValidEngineHelper($engine); |
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322 | } |
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323 | |||
324 | /** |
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325 | * Encrypts a block |
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326 | * |
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874 | daniel-mar | 327 | * @access private |
827 | daniel-mar | 328 | * @param string $in |
329 | * @return string |
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330 | */ |
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331 | protected function encryptBlock($in) |
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332 | { |
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333 | static $tables; |
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334 | if (empty($tables)) { |
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335 | $tables = &$this->getTables(); |
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336 | } |
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337 | $t0 = $tables[0]; |
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338 | $t1 = $tables[1]; |
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339 | $t2 = $tables[2]; |
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340 | $t3 = $tables[3]; |
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341 | $sbox = $tables[4]; |
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342 | |||
343 | $state = []; |
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344 | $words = unpack('N*', $in); |
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345 | |||
346 | $c = $this->c; |
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347 | $w = $this->w; |
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348 | $Nb = $this->Nb; |
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349 | $Nr = $this->Nr; |
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350 | |||
351 | // addRoundKey |
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352 | $wc = $Nb - 1; |
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353 | foreach ($words as $word) { |
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354 | $state[] = $word ^ $w[++$wc]; |
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355 | } |
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356 | |||
357 | // fips-197.pdf#page=19, "Figure 5. Pseudo Code for the Cipher", states that this loop has four components - |
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358 | // subBytes, shiftRows, mixColumns, and addRoundKey. fips-197.pdf#page=30, "Implementation Suggestions Regarding |
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359 | // Various Platforms" suggests that performs enhanced implementations are described in Rijndael-ammended.pdf. |
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360 | // Rijndael-ammended.pdf#page=20, "Implementation aspects / 32-bit processor", discusses such an optimization. |
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361 | // Unfortunately, the description given there is not quite correct. Per aes.spec.v316.pdf#page=19 [1], |
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362 | // equation (7.4.7) is supposed to use addition instead of subtraction, so we'll do that here, as well. |
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363 | |||
364 | // [1] http://fp.gladman.plus.com/cryptography_technology/rijndael/aes.spec.v316.pdf |
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365 | $temp = []; |
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366 | for ($round = 1; $round < $Nr; ++$round) { |
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367 | $i = 0; // $c[0] == 0 |
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368 | $j = $c[1]; |
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369 | $k = $c[2]; |
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370 | $l = $c[3]; |
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371 | |||
372 | while ($i < $Nb) { |
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373 | $temp[$i] = $t0[$state[$i] >> 24 & 0x000000FF] ^ |
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374 | $t1[$state[$j] >> 16 & 0x000000FF] ^ |
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375 | $t2[$state[$k] >> 8 & 0x000000FF] ^ |
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376 | $t3[$state[$l] & 0x000000FF] ^ |
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377 | $w[++$wc]; |
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378 | ++$i; |
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379 | $j = ($j + 1) % $Nb; |
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380 | $k = ($k + 1) % $Nb; |
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381 | $l = ($l + 1) % $Nb; |
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382 | } |
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383 | $state = $temp; |
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384 | } |
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385 | |||
386 | // subWord |
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387 | for ($i = 0; $i < $Nb; ++$i) { |
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388 | $state[$i] = $sbox[$state[$i] & 0x000000FF] | |
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389 | ($sbox[$state[$i] >> 8 & 0x000000FF] << 8) | |
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390 | ($sbox[$state[$i] >> 16 & 0x000000FF] << 16) | |
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391 | ($sbox[$state[$i] >> 24 & 0x000000FF] << 24); |
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392 | } |
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393 | |||
394 | // shiftRows + addRoundKey |
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395 | $i = 0; // $c[0] == 0 |
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396 | $j = $c[1]; |
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397 | $k = $c[2]; |
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398 | $l = $c[3]; |
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399 | while ($i < $Nb) { |
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400 | $temp[$i] = ($state[$i] & 0xFF000000) ^ |
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401 | ($state[$j] & 0x00FF0000) ^ |
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402 | ($state[$k] & 0x0000FF00) ^ |
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403 | ($state[$l] & 0x000000FF) ^ |
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404 | $w[$i]; |
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405 | ++$i; |
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406 | $j = ($j + 1) % $Nb; |
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407 | $k = ($k + 1) % $Nb; |
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408 | $l = ($l + 1) % $Nb; |
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409 | } |
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410 | |||
411 | return pack('N*', ...$temp); |
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412 | } |
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413 | |||
414 | /** |
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415 | * Decrypts a block |
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416 | * |
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874 | daniel-mar | 417 | * @access private |
827 | daniel-mar | 418 | * @param string $in |
419 | * @return string |
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420 | */ |
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421 | protected function decryptBlock($in) |
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422 | { |
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423 | static $invtables; |
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424 | if (empty($invtables)) { |
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425 | $invtables = &$this->getInvTables(); |
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426 | } |
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427 | $dt0 = $invtables[0]; |
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428 | $dt1 = $invtables[1]; |
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429 | $dt2 = $invtables[2]; |
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430 | $dt3 = $invtables[3]; |
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431 | $isbox = $invtables[4]; |
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432 | |||
433 | $state = []; |
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434 | $words = unpack('N*', $in); |
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435 | |||
436 | $c = $this->c; |
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437 | $dw = $this->dw; |
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438 | $Nb = $this->Nb; |
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439 | $Nr = $this->Nr; |
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440 | |||
441 | // addRoundKey |
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442 | $wc = $Nb - 1; |
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443 | foreach ($words as $word) { |
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444 | $state[] = $word ^ $dw[++$wc]; |
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445 | } |
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446 | |||
447 | $temp = []; |
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448 | for ($round = $Nr - 1; $round > 0; --$round) { |
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449 | $i = 0; // $c[0] == 0 |
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450 | $j = $Nb - $c[1]; |
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451 | $k = $Nb - $c[2]; |
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452 | $l = $Nb - $c[3]; |
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453 | |||
454 | while ($i < $Nb) { |
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455 | $temp[$i] = $dt0[$state[$i] >> 24 & 0x000000FF] ^ |
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456 | $dt1[$state[$j] >> 16 & 0x000000FF] ^ |
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457 | $dt2[$state[$k] >> 8 & 0x000000FF] ^ |
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458 | $dt3[$state[$l] & 0x000000FF] ^ |
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459 | $dw[++$wc]; |
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460 | ++$i; |
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461 | $j = ($j + 1) % $Nb; |
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462 | $k = ($k + 1) % $Nb; |
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463 | $l = ($l + 1) % $Nb; |
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464 | } |
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465 | $state = $temp; |
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466 | } |
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467 | |||
468 | // invShiftRows + invSubWord + addRoundKey |
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469 | $i = 0; // $c[0] == 0 |
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470 | $j = $Nb - $c[1]; |
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471 | $k = $Nb - $c[2]; |
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472 | $l = $Nb - $c[3]; |
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473 | |||
474 | while ($i < $Nb) { |
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475 | $word = ($state[$i] & 0xFF000000) | |
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476 | ($state[$j] & 0x00FF0000) | |
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477 | ($state[$k] & 0x0000FF00) | |
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478 | ($state[$l] & 0x000000FF); |
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479 | |||
480 | $temp[$i] = $dw[$i] ^ ($isbox[$word & 0x000000FF] | |
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481 | ($isbox[$word >> 8 & 0x000000FF] << 8) | |
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482 | ($isbox[$word >> 16 & 0x000000FF] << 16) | |
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483 | ($isbox[$word >> 24 & 0x000000FF] << 24)); |
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484 | ++$i; |
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485 | $j = ($j + 1) % $Nb; |
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486 | $k = ($k + 1) % $Nb; |
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487 | $l = ($l + 1) % $Nb; |
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488 | } |
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489 | |||
490 | return pack('N*', ...$temp); |
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491 | } |
||
492 | |||
493 | /** |
||
494 | * Setup the self::ENGINE_INTERNAL $engine |
||
495 | * |
||
496 | * (re)init, if necessary, the internal cipher $engine and flush all $buffers |
||
497 | * Used (only) if $engine == self::ENGINE_INTERNAL |
||
498 | * |
||
499 | * _setup() will be called each time if $changed === true |
||
500 | * typically this happens when using one or more of following public methods: |
||
501 | * |
||
502 | * - setKey() |
||
503 | * |
||
504 | * - setIV() |
||
505 | * |
||
506 | * - disableContinuousBuffer() |
||
507 | * |
||
508 | * - First run of encrypt() / decrypt() with no init-settings |
||
509 | * |
||
510 | * {@internal setup() is always called before en/decryption.} |
||
511 | * |
||
512 | * {@internal Could, but not must, extend by the child Crypt_* class} |
||
513 | * |
||
514 | * @see self::setKey() |
||
515 | * @see self::setIV() |
||
516 | * @see self::disableContinuousBuffer() |
||
874 | daniel-mar | 517 | * @access private |
827 | daniel-mar | 518 | */ |
519 | protected function setup() |
||
520 | { |
||
521 | if (!$this->changed) { |
||
522 | return; |
||
523 | } |
||
524 | |||
525 | parent::setup(); |
||
526 | |||
527 | if (is_string($this->iv) && strlen($this->iv) != $this->block_size) { |
||
528 | throw new InconsistentSetupException('The IV length (' . strlen($this->iv) . ') does not match the block size (' . $this->block_size . ')'); |
||
529 | } |
||
530 | } |
||
531 | |||
532 | /** |
||
533 | * Setup the key (expansion) |
||
534 | * |
||
535 | * @see \phpseclib3\Crypt\Common\SymmetricKey::setupKey() |
||
874 | daniel-mar | 536 | * @access private |
827 | daniel-mar | 537 | */ |
538 | protected function setupKey() |
||
539 | { |
||
540 | // Each number in $rcon is equal to the previous number multiplied by two in Rijndael's finite field. |
||
541 | // See http://en.wikipedia.org/wiki/Finite_field_arithmetic#Multiplicative_inverse |
||
542 | static $rcon = [0, |
||
543 | 0x01000000, 0x02000000, 0x04000000, 0x08000000, 0x10000000, |
||
544 | 0x20000000, 0x40000000, 0x80000000, 0x1B000000, 0x36000000, |
||
545 | 0x6C000000, 0xD8000000, 0xAB000000, 0x4D000000, 0x9A000000, |
||
546 | 0x2F000000, 0x5E000000, 0xBC000000, 0x63000000, 0xC6000000, |
||
547 | 0x97000000, 0x35000000, 0x6A000000, 0xD4000000, 0xB3000000, |
||
548 | 0x7D000000, 0xFA000000, 0xEF000000, 0xC5000000, 0x91000000 |
||
549 | ]; |
||
550 | |||
551 | if (isset($this->kl['key']) && $this->key === $this->kl['key'] && $this->key_length === $this->kl['key_length'] && $this->block_size === $this->kl['block_size']) { |
||
552 | // already expanded |
||
553 | return; |
||
554 | } |
||
555 | $this->kl = ['key' => $this->key, 'key_length' => $this->key_length, 'block_size' => $this->block_size]; |
||
556 | |||
557 | $this->Nk = $this->key_length >> 2; |
||
558 | // see Rijndael-ammended.pdf#page=44 |
||
559 | $this->Nr = max($this->Nk, $this->Nb) + 6; |
||
560 | |||
561 | // shift offsets for Nb = 5, 7 are defined in Rijndael-ammended.pdf#page=44, |
||
562 | // "Table 8: Shift offsets in Shiftrow for the alternative block lengths" |
||
563 | // shift offsets for Nb = 4, 6, 8 are defined in Rijndael-ammended.pdf#page=14, |
||
564 | // "Table 2: Shift offsets for different block lengths" |
||
565 | switch ($this->Nb) { |
||
566 | case 4: |
||
567 | case 5: |
||
568 | case 6: |
||
569 | $this->c = [0, 1, 2, 3]; |
||
570 | break; |
||
571 | case 7: |
||
572 | $this->c = [0, 1, 2, 4]; |
||
573 | break; |
||
574 | case 8: |
||
575 | $this->c = [0, 1, 3, 4]; |
||
576 | } |
||
577 | |||
578 | $w = array_values(unpack('N*words', $this->key)); |
||
579 | |||
580 | $length = $this->Nb * ($this->Nr + 1); |
||
581 | for ($i = $this->Nk; $i < $length; $i++) { |
||
582 | $temp = $w[$i - 1]; |
||
583 | if ($i % $this->Nk == 0) { |
||
584 | // according to <http://php.net/language.types.integer>, "the size of an integer is platform-dependent". |
||
585 | // on a 32-bit machine, it's 32-bits, and on a 64-bit machine, it's 64-bits. on a 32-bit machine, |
||
586 | // 0xFFFFFFFF << 8 == 0xFFFFFF00, but on a 64-bit machine, it equals 0xFFFFFFFF00. as such, doing 'and' |
||
587 | // with 0xFFFFFFFF (or 0xFFFFFF00) on a 32-bit machine is unnecessary, but on a 64-bit machine, it is. |
||
588 | $temp = (($temp << 8) & 0xFFFFFF00) | (($temp >> 24) & 0x000000FF); // rotWord |
||
589 | $temp = $this->subWord($temp) ^ $rcon[$i / $this->Nk]; |
||
590 | } elseif ($this->Nk > 6 && $i % $this->Nk == 4) { |
||
591 | $temp = $this->subWord($temp); |
||
592 | } |
||
593 | $w[$i] = $w[$i - $this->Nk] ^ $temp; |
||
594 | } |
||
595 | |||
596 | // convert the key schedule from a vector of $Nb * ($Nr + 1) length to a matrix with $Nr + 1 rows and $Nb columns |
||
597 | // and generate the inverse key schedule. more specifically, |
||
598 | // according to <http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=23> (section 5.3.3), |
||
599 | // "The key expansion for the Inverse Cipher is defined as follows: |
||
600 | // 1. Apply the Key Expansion. |
||
601 | // 2. Apply InvMixColumn to all Round Keys except the first and the last one." |
||
602 | // also, see fips-197.pdf#page=27, "5.3.5 Equivalent Inverse Cipher" |
||
603 | list($dt0, $dt1, $dt2, $dt3) = $this->getInvTables(); |
||
604 | $temp = $this->w = $this->dw = []; |
||
605 | for ($i = $row = $col = 0; $i < $length; $i++, $col++) { |
||
606 | if ($col == $this->Nb) { |
||
607 | if ($row == 0) { |
||
608 | $this->dw[0] = $this->w[0]; |
||
609 | } else { |
||
610 | // subWord + invMixColumn + invSubWord = invMixColumn |
||
611 | $j = 0; |
||
612 | while ($j < $this->Nb) { |
||
613 | $dw = $this->subWord($this->w[$row][$j]); |
||
614 | $temp[$j] = $dt0[$dw >> 24 & 0x000000FF] ^ |
||
615 | $dt1[$dw >> 16 & 0x000000FF] ^ |
||
616 | $dt2[$dw >> 8 & 0x000000FF] ^ |
||
617 | $dt3[$dw & 0x000000FF]; |
||
618 | $j++; |
||
619 | } |
||
620 | $this->dw[$row] = $temp; |
||
621 | } |
||
622 | |||
623 | $col = 0; |
||
624 | $row++; |
||
625 | } |
||
626 | $this->w[$row][$col] = $w[$i]; |
||
627 | } |
||
628 | |||
629 | $this->dw[$row] = $this->w[$row]; |
||
630 | |||
631 | // Converting to 1-dim key arrays (both ascending) |
||
632 | $this->dw = array_reverse($this->dw); |
||
633 | $w = array_pop($this->w); |
||
634 | $dw = array_pop($this->dw); |
||
635 | foreach ($this->w as $r => $wr) { |
||
636 | foreach ($wr as $c => $wc) { |
||
637 | $w[] = $wc; |
||
638 | $dw[] = $this->dw[$r][$c]; |
||
639 | } |
||
640 | } |
||
641 | $this->w = $w; |
||
642 | $this->dw = $dw; |
||
643 | } |
||
644 | |||
645 | /** |
||
646 | * Performs S-Box substitutions |
||
647 | * |
||
648 | * @return array |
||
874 | daniel-mar | 649 | * @access private |
827 | daniel-mar | 650 | * @param int $word |
651 | */ |
||
652 | private function subWord($word) |
||
653 | { |
||
654 | static $sbox; |
||
655 | if (empty($sbox)) { |
||
656 | list(, , , , $sbox) = self::getTables(); |
||
657 | } |
||
658 | |||
659 | return $sbox[$word & 0x000000FF] | |
||
660 | ($sbox[$word >> 8 & 0x000000FF] << 8) | |
||
661 | ($sbox[$word >> 16 & 0x000000FF] << 16) | |
||
662 | ($sbox[$word >> 24 & 0x000000FF] << 24); |
||
663 | } |
||
664 | |||
665 | /** |
||
666 | * Provides the mixColumns and sboxes tables |
||
667 | * |
||
668 | * @see self::encryptBlock() |
||
669 | * @see self::setupInlineCrypt() |
||
670 | * @see self::subWord() |
||
874 | daniel-mar | 671 | * @access private |
827 | daniel-mar | 672 | * @return array &$tables |
673 | */ |
||
674 | protected function &getTables() |
||
675 | { |
||
676 | static $tables; |
||
677 | if (empty($tables)) { |
||
678 | // according to <http://csrc.nist.gov/archive/aes/rijndael/Rijndael-ammended.pdf#page=19> (section 5.2.1), |
||
679 | // precomputed tables can be used in the mixColumns phase. in that example, they're assigned t0...t3, so |
||
680 | // those are the names we'll use. |
||
681 | $t3 = array_map('intval', [ |
||
682 | // with array_map('intval', ...) we ensure we have only int's and not |
||
683 | // some slower floats converted by php automatically on high values |
||
684 | 0x6363A5C6, 0x7C7C84F8, 0x777799EE, 0x7B7B8DF6, 0xF2F20DFF, 0x6B6BBDD6, 0x6F6FB1DE, 0xC5C55491, |
||
685 | 0x30305060, 0x01010302, 0x6767A9CE, 0x2B2B7D56, 0xFEFE19E7, 0xD7D762B5, 0xABABE64D, 0x76769AEC, |
||
686 | 0xCACA458F, 0x82829D1F, 0xC9C94089, 0x7D7D87FA, 0xFAFA15EF, 0x5959EBB2, 0x4747C98E, 0xF0F00BFB, |
||
687 | 0xADADEC41, 0xD4D467B3, 0xA2A2FD5F, 0xAFAFEA45, 0x9C9CBF23, 0xA4A4F753, 0x727296E4, 0xC0C05B9B, |
||
688 | 0xB7B7C275, 0xFDFD1CE1, 0x9393AE3D, 0x26266A4C, 0x36365A6C, 0x3F3F417E, 0xF7F702F5, 0xCCCC4F83, |
||
689 | 0x34345C68, 0xA5A5F451, 0xE5E534D1, 0xF1F108F9, 0x717193E2, 0xD8D873AB, 0x31315362, 0x15153F2A, |
||
690 | 0x04040C08, 0xC7C75295, 0x23236546, 0xC3C35E9D, 0x18182830, 0x9696A137, 0x05050F0A, 0x9A9AB52F, |
||
691 | 0x0707090E, 0x12123624, 0x80809B1B, 0xE2E23DDF, 0xEBEB26CD, 0x2727694E, 0xB2B2CD7F, 0x75759FEA, |
||
692 | 0x09091B12, 0x83839E1D, 0x2C2C7458, 0x1A1A2E34, 0x1B1B2D36, 0x6E6EB2DC, 0x5A5AEEB4, 0xA0A0FB5B, |
||
693 | 0x5252F6A4, 0x3B3B4D76, 0xD6D661B7, 0xB3B3CE7D, 0x29297B52, 0xE3E33EDD, 0x2F2F715E, 0x84849713, |
||
694 | 0x5353F5A6, 0xD1D168B9, 0x00000000, 0xEDED2CC1, 0x20206040, 0xFCFC1FE3, 0xB1B1C879, 0x5B5BEDB6, |
||
695 | 0x6A6ABED4, 0xCBCB468D, 0xBEBED967, 0x39394B72, 0x4A4ADE94, 0x4C4CD498, 0x5858E8B0, 0xCFCF4A85, |
||
696 | 0xD0D06BBB, 0xEFEF2AC5, 0xAAAAE54F, 0xFBFB16ED, 0x4343C586, 0x4D4DD79A, 0x33335566, 0x85859411, |
||
697 | 0x4545CF8A, 0xF9F910E9, 0x02020604, 0x7F7F81FE, 0x5050F0A0, 0x3C3C4478, 0x9F9FBA25, 0xA8A8E34B, |
||
698 | 0x5151F3A2, 0xA3A3FE5D, 0x4040C080, 0x8F8F8A05, 0x9292AD3F, 0x9D9DBC21, 0x38384870, 0xF5F504F1, |
||
699 | 0xBCBCDF63, 0xB6B6C177, 0xDADA75AF, 0x21216342, 0x10103020, 0xFFFF1AE5, 0xF3F30EFD, 0xD2D26DBF, |
||
700 | 0xCDCD4C81, 0x0C0C1418, 0x13133526, 0xECEC2FC3, 0x5F5FE1BE, 0x9797A235, 0x4444CC88, 0x1717392E, |
||
701 | 0xC4C45793, 0xA7A7F255, 0x7E7E82FC, 0x3D3D477A, 0x6464ACC8, 0x5D5DE7BA, 0x19192B32, 0x737395E6, |
||
702 | 0x6060A0C0, 0x81819819, 0x4F4FD19E, 0xDCDC7FA3, 0x22226644, 0x2A2A7E54, 0x9090AB3B, 0x8888830B, |
||
703 | 0x4646CA8C, 0xEEEE29C7, 0xB8B8D36B, 0x14143C28, 0xDEDE79A7, 0x5E5EE2BC, 0x0B0B1D16, 0xDBDB76AD, |
||
704 | 0xE0E03BDB, 0x32325664, 0x3A3A4E74, 0x0A0A1E14, 0x4949DB92, 0x06060A0C, 0x24246C48, 0x5C5CE4B8, |
||
705 | 0xC2C25D9F, 0xD3D36EBD, 0xACACEF43, 0x6262A6C4, 0x9191A839, 0x9595A431, 0xE4E437D3, 0x79798BF2, |
||
706 | 0xE7E732D5, 0xC8C8438B, 0x3737596E, 0x6D6DB7DA, 0x8D8D8C01, 0xD5D564B1, 0x4E4ED29C, 0xA9A9E049, |
||
707 | 0x6C6CB4D8, 0x5656FAAC, 0xF4F407F3, 0xEAEA25CF, 0x6565AFCA, 0x7A7A8EF4, 0xAEAEE947, 0x08081810, |
||
708 | 0xBABAD56F, 0x787888F0, 0x25256F4A, 0x2E2E725C, 0x1C1C2438, 0xA6A6F157, 0xB4B4C773, 0xC6C65197, |
||
709 | 0xE8E823CB, 0xDDDD7CA1, 0x74749CE8, 0x1F1F213E, 0x4B4BDD96, 0xBDBDDC61, 0x8B8B860D, 0x8A8A850F, |
||
710 | 0x707090E0, 0x3E3E427C, 0xB5B5C471, 0x6666AACC, 0x4848D890, 0x03030506, 0xF6F601F7, 0x0E0E121C, |
||
711 | 0x6161A3C2, 0x35355F6A, 0x5757F9AE, 0xB9B9D069, 0x86869117, 0xC1C15899, 0x1D1D273A, 0x9E9EB927, |
||
712 | 0xE1E138D9, 0xF8F813EB, 0x9898B32B, 0x11113322, 0x6969BBD2, 0xD9D970A9, 0x8E8E8907, 0x9494A733, |
||
713 | 0x9B9BB62D, 0x1E1E223C, 0x87879215, 0xE9E920C9, 0xCECE4987, 0x5555FFAA, 0x28287850, 0xDFDF7AA5, |
||
714 | 0x8C8C8F03, 0xA1A1F859, 0x89898009, 0x0D0D171A, 0xBFBFDA65, 0xE6E631D7, 0x4242C684, 0x6868B8D0, |
||
715 | 0x4141C382, 0x9999B029, 0x2D2D775A, 0x0F0F111E, 0xB0B0CB7B, 0x5454FCA8, 0xBBBBD66D, 0x16163A2C |
||
716 | ]); |
||
717 | |||
718 | foreach ($t3 as $t3i) { |
||
719 | $t0[] = (($t3i << 24) & 0xFF000000) | (($t3i >> 8) & 0x00FFFFFF); |
||
720 | $t1[] = (($t3i << 16) & 0xFFFF0000) | (($t3i >> 16) & 0x0000FFFF); |
||
721 | $t2[] = (($t3i << 8) & 0xFFFFFF00) | (($t3i >> 24) & 0x000000FF); |
||
722 | } |
||
723 | |||
724 | $tables = [ |
||
725 | // The Precomputed mixColumns tables t0 - t3 |
||
726 | $t0, |
||
727 | $t1, |
||
728 | $t2, |
||
729 | $t3, |
||
730 | // The SubByte S-Box |
||
731 | [ |
||
732 | 0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76, |
||
733 | 0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0, |
||
734 | 0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15, |
||
735 | 0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75, |
||
736 | 0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84, |
||
737 | 0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF, |
||
738 | 0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8, |
||
739 | 0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2, |
||
740 | 0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73, |
||
741 | 0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB, |
||
742 | 0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79, |
||
743 | 0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08, |
||
744 | 0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A, |
||
745 | 0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E, |
||
746 | 0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF, |
||
747 | 0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16 |
||
748 | ] |
||
749 | ]; |
||
750 | } |
||
751 | return $tables; |
||
752 | } |
||
753 | |||
754 | /** |
||
755 | * Provides the inverse mixColumns and inverse sboxes tables |
||
756 | * |
||
757 | * @see self::decryptBlock() |
||
758 | * @see self::setupInlineCrypt() |
||
759 | * @see self::setupKey() |
||
874 | daniel-mar | 760 | * @access private |
827 | daniel-mar | 761 | * @return array &$tables |
762 | */ |
||
763 | protected function &getInvTables() |
||
764 | { |
||
765 | static $tables; |
||
766 | if (empty($tables)) { |
||
767 | $dt3 = array_map('intval', [ |
||
768 | 0xF4A75051, 0x4165537E, 0x17A4C31A, 0x275E963A, 0xAB6BCB3B, 0x9D45F11F, 0xFA58ABAC, 0xE303934B, |
||
769 | 0x30FA5520, 0x766DF6AD, 0xCC769188, 0x024C25F5, 0xE5D7FC4F, 0x2ACBD7C5, 0x35448026, 0x62A38FB5, |
||
770 | 0xB15A49DE, 0xBA1B6725, 0xEA0E9845, 0xFEC0E15D, 0x2F7502C3, 0x4CF01281, 0x4697A38D, 0xD3F9C66B, |
||
771 | 0x8F5FE703, 0x929C9515, 0x6D7AEBBF, 0x5259DA95, 0xBE832DD4, 0x7421D358, 0xE0692949, 0xC9C8448E, |
||
772 | 0xC2896A75, 0x8E7978F4, 0x583E6B99, 0xB971DD27, 0xE14FB6BE, 0x88AD17F0, 0x20AC66C9, 0xCE3AB47D, |
||
773 | 0xDF4A1863, 0x1A3182E5, 0x51336097, 0x537F4562, 0x6477E0B1, 0x6BAE84BB, 0x81A01CFE, 0x082B94F9, |
||
774 | 0x48685870, 0x45FD198F, 0xDE6C8794, 0x7BF8B752, 0x73D323AB, 0x4B02E272, 0x1F8F57E3, 0x55AB2A66, |
||
775 | 0xEB2807B2, 0xB5C2032F, 0xC57B9A86, 0x3708A5D3, 0x2887F230, 0xBFA5B223, 0x036ABA02, 0x16825CED, |
||
776 | 0xCF1C2B8A, 0x79B492A7, 0x07F2F0F3, 0x69E2A14E, 0xDAF4CD65, 0x05BED506, 0x34621FD1, 0xA6FE8AC4, |
||
777 | 0x2E539D34, 0xF355A0A2, 0x8AE13205, 0xF6EB75A4, 0x83EC390B, 0x60EFAA40, 0x719F065E, 0x6E1051BD, |
||
778 | 0x218AF93E, 0xDD063D96, 0x3E05AEDD, 0xE6BD464D, 0x548DB591, 0xC45D0571, 0x06D46F04, 0x5015FF60, |
||
779 | 0x98FB2419, 0xBDE997D6, 0x4043CC89, 0xD99E7767, 0xE842BDB0, 0x898B8807, 0x195B38E7, 0xC8EEDB79, |
||
780 | 0x7C0A47A1, 0x420FE97C, 0x841EC9F8, 0x00000000, 0x80868309, 0x2BED4832, 0x1170AC1E, 0x5A724E6C, |
||
781 | 0x0EFFFBFD, 0x8538560F, 0xAED51E3D, 0x2D392736, 0x0FD9640A, 0x5CA62168, 0x5B54D19B, 0x362E3A24, |
||
782 | 0x0A67B10C, 0x57E70F93, 0xEE96D2B4, 0x9B919E1B, 0xC0C54F80, 0xDC20A261, 0x774B695A, 0x121A161C, |
||
783 | 0x93BA0AE2, 0xA02AE5C0, 0x22E0433C, 0x1B171D12, 0x090D0B0E, 0x8BC7ADF2, 0xB6A8B92D, 0x1EA9C814, |
||
784 | 0xF1198557, 0x75074CAF, 0x99DDBBEE, 0x7F60FDA3, 0x01269FF7, 0x72F5BC5C, 0x663BC544, 0xFB7E345B, |
||
785 | 0x4329768B, 0x23C6DCCB, 0xEDFC68B6, 0xE4F163B8, 0x31DCCAD7, 0x63851042, 0x97224013, 0xC6112084, |
||
786 | 0x4A247D85, 0xBB3DF8D2, 0xF93211AE, 0x29A16DC7, 0x9E2F4B1D, 0xB230F3DC, 0x8652EC0D, 0xC1E3D077, |
||
787 | 0xB3166C2B, 0x70B999A9, 0x9448FA11, 0xE9642247, 0xFC8CC4A8, 0xF03F1AA0, 0x7D2CD856, 0x3390EF22, |
||
788 | 0x494EC787, 0x38D1C1D9, 0xCAA2FE8C, 0xD40B3698, 0xF581CFA6, 0x7ADE28A5, 0xB78E26DA, 0xADBFA43F, |
||
789 | 0x3A9DE42C, 0x78920D50, 0x5FCC9B6A, 0x7E466254, 0x8D13C2F6, 0xD8B8E890, 0x39F75E2E, 0xC3AFF582, |
||
790 | 0x5D80BE9F, 0xD0937C69, 0xD52DA96F, 0x2512B3CF, 0xAC993BC8, 0x187DA710, 0x9C636EE8, 0x3BBB7BDB, |
||
791 | 0x267809CD, 0x5918F46E, 0x9AB701EC, 0x4F9AA883, 0x956E65E6, 0xFFE67EAA, 0xBCCF0821, 0x15E8E6EF, |
||
792 | 0xE79BD9BA, 0x6F36CE4A, 0x9F09D4EA, 0xB07CD629, 0xA4B2AF31, 0x3F23312A, 0xA59430C6, 0xA266C035, |
||
793 | 0x4EBC3774, 0x82CAA6FC, 0x90D0B0E0, 0xA7D81533, 0x04984AF1, 0xECDAF741, 0xCD500E7F, 0x91F62F17, |
||
794 | 0x4DD68D76, 0xEFB04D43, 0xAA4D54CC, 0x9604DFE4, 0xD1B5E39E, 0x6A881B4C, 0x2C1FB8C1, 0x65517F46, |
||
795 | 0x5EEA049D, 0x8C355D01, 0x877473FA, 0x0B412EFB, 0x671D5AB3, 0xDBD25292, 0x105633E9, 0xD647136D, |
||
796 | 0xD7618C9A, 0xA10C7A37, 0xF8148E59, 0x133C89EB, 0xA927EECE, 0x61C935B7, 0x1CE5EDE1, 0x47B13C7A, |
||
797 | 0xD2DF599C, 0xF2733F55, 0x14CE7918, 0xC737BF73, 0xF7CDEA53, 0xFDAA5B5F, 0x3D6F14DF, 0x44DB8678, |
||
798 | 0xAFF381CA, 0x68C43EB9, 0x24342C38, 0xA3405FC2, 0x1DC37216, 0xE2250CBC, 0x3C498B28, 0x0D9541FF, |
||
799 | 0xA8017139, 0x0CB3DE08, 0xB4E49CD8, 0x56C19064, 0xCB84617B, 0x32B670D5, 0x6C5C7448, 0xB85742D0 |
||
800 | ]); |
||
801 | |||
802 | foreach ($dt3 as $dt3i) { |
||
803 | $dt0[] = (($dt3i << 24) & 0xFF000000) | (($dt3i >> 8) & 0x00FFFFFF); |
||
804 | $dt1[] = (($dt3i << 16) & 0xFFFF0000) | (($dt3i >> 16) & 0x0000FFFF); |
||
805 | $dt2[] = (($dt3i << 8) & 0xFFFFFF00) | (($dt3i >> 24) & 0x000000FF); |
||
806 | }; |
||
807 | |||
808 | $tables = [ |
||
809 | // The Precomputed inverse mixColumns tables dt0 - dt3 |
||
810 | $dt0, |
||
811 | $dt1, |
||
812 | $dt2, |
||
813 | $dt3, |
||
814 | // The inverse SubByte S-Box |
||
815 | [ |
||
816 | 0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, 0xF3, 0xD7, 0xFB, |
||
817 | 0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, 0xCB, |
||
818 | 0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E, |
||
819 | 0x08, 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25, |
||
820 | 0x72, 0xF8, 0xF6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92, |
||
821 | 0x6C, 0x70, 0x48, 0x50, 0xFD, 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84, |
||
822 | 0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06, |
||
823 | 0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B, |
||
824 | 0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, 0xCE, 0xF0, 0xB4, 0xE6, 0x73, |
||
825 | 0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, 0x75, 0xDF, 0x6E, |
||
826 | 0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, 0x1B, |
||
827 | 0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4, |
||
828 | 0x1F, 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F, |
||
829 | 0x60, 0x51, 0x7F, 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF, |
||
830 | 0xA0, 0xE0, 0x3B, 0x4D, 0xAE, 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61, |
||
831 | 0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D |
||
832 | ] |
||
833 | ]; |
||
834 | } |
||
835 | return $tables; |
||
836 | } |
||
837 | |||
838 | /** |
||
839 | * Setup the performance-optimized function for de/encrypt() |
||
840 | * |
||
841 | * @see \phpseclib3\Crypt\Common\SymmetricKey::setupInlineCrypt() |
||
874 | daniel-mar | 842 | * @access private |
827 | daniel-mar | 843 | */ |
844 | protected function setupInlineCrypt() |
||
845 | { |
||
846 | $w = $this->w; |
||
847 | $dw = $this->dw; |
||
848 | $init_encrypt = ''; |
||
849 | $init_decrypt = ''; |
||
850 | |||
851 | $Nr = $this->Nr; |
||
852 | $Nb = $this->Nb; |
||
853 | $c = $this->c; |
||
854 | |||
855 | // Generating encrypt code: |
||
856 | $init_encrypt .= ' |
||
857 | static $tables; |
||
858 | if (empty($tables)) { |
||
859 | $tables = &$this->getTables(); |
||
860 | } |
||
861 | $t0 = $tables[0]; |
||
862 | $t1 = $tables[1]; |
||
863 | $t2 = $tables[2]; |
||
864 | $t3 = $tables[3]; |
||
865 | $sbox = $tables[4]; |
||
866 | '; |
||
867 | |||
868 | $s = 'e'; |
||
869 | $e = 's'; |
||
870 | $wc = $Nb - 1; |
||
871 | |||
872 | // Preround: addRoundKey |
||
873 | $encrypt_block = '$in = unpack("N*", $in);' . "\n"; |
||
874 | for ($i = 0; $i < $Nb; ++$i) { |
||
875 | $encrypt_block .= '$s' . $i . ' = $in[' . ($i + 1) . '] ^ ' . $w[++$wc] . ";\n"; |
||
876 | } |
||
877 | |||
878 | // Mainrounds: shiftRows + subWord + mixColumns + addRoundKey |
||
879 | for ($round = 1; $round < $Nr; ++$round) { |
||
880 | list($s, $e) = [$e, $s]; |
||
881 | for ($i = 0; $i < $Nb; ++$i) { |
||
882 | $encrypt_block .= |
||
883 | '$' . $e . $i . ' = |
||
884 | $t0[($' . $s . $i . ' >> 24) & 0xff] ^ |
||
885 | $t1[($' . $s . (($i + $c[1]) % $Nb) . ' >> 16) & 0xff] ^ |
||
886 | $t2[($' . $s . (($i + $c[2]) % $Nb) . ' >> 8) & 0xff] ^ |
||
887 | $t3[ $' . $s . (($i + $c[3]) % $Nb) . ' & 0xff] ^ |
||
888 | ' . $w[++$wc] . ";\n"; |
||
889 | } |
||
890 | } |
||
891 | |||
892 | // Finalround: subWord + shiftRows + addRoundKey |
||
893 | for ($i = 0; $i < $Nb; ++$i) { |
||
894 | $encrypt_block .= |
||
895 | '$' . $e . $i . ' = |
||
896 | $sbox[ $' . $e . $i . ' & 0xff] | |
||
897 | ($sbox[($' . $e . $i . ' >> 8) & 0xff] << 8) | |
||
898 | ($sbox[($' . $e . $i . ' >> 16) & 0xff] << 16) | |
||
899 | ($sbox[($' . $e . $i . ' >> 24) & 0xff] << 24);' . "\n"; |
||
900 | } |
||
901 | $encrypt_block .= '$in = pack("N*"' . "\n"; |
||
902 | for ($i = 0; $i < $Nb; ++$i) { |
||
903 | $encrypt_block .= ', |
||
904 | ($' . $e . $i . ' & ' . ((int)0xFF000000) . ') ^ |
||
905 | ($' . $e . (($i + $c[1]) % $Nb) . ' & 0x00FF0000 ) ^ |
||
906 | ($' . $e . (($i + $c[2]) % $Nb) . ' & 0x0000FF00 ) ^ |
||
907 | ($' . $e . (($i + $c[3]) % $Nb) . ' & 0x000000FF ) ^ |
||
908 | ' . $w[$i] . "\n"; |
||
909 | } |
||
910 | $encrypt_block .= ');'; |
||
911 | |||
912 | // Generating decrypt code: |
||
913 | $init_decrypt .= ' |
||
914 | static $invtables; |
||
915 | if (empty($invtables)) { |
||
916 | $invtables = &$this->getInvTables(); |
||
917 | } |
||
918 | $dt0 = $invtables[0]; |
||
919 | $dt1 = $invtables[1]; |
||
920 | $dt2 = $invtables[2]; |
||
921 | $dt3 = $invtables[3]; |
||
922 | $isbox = $invtables[4]; |
||
923 | '; |
||
924 | |||
925 | $s = 'e'; |
||
926 | $e = 's'; |
||
927 | $wc = $Nb - 1; |
||
928 | |||
929 | // Preround: addRoundKey |
||
930 | $decrypt_block = '$in = unpack("N*", $in);' . "\n"; |
||
931 | for ($i = 0; $i < $Nb; ++$i) { |
||
932 | $decrypt_block .= '$s' . $i . ' = $in[' . ($i + 1) . '] ^ ' . $dw[++$wc] . ';' . "\n"; |
||
933 | } |
||
934 | |||
935 | // Mainrounds: shiftRows + subWord + mixColumns + addRoundKey |
||
936 | for ($round = 1; $round < $Nr; ++$round) { |
||
937 | list($s, $e) = [$e, $s]; |
||
938 | for ($i = 0; $i < $Nb; ++$i) { |
||
939 | $decrypt_block .= |
||
940 | '$' . $e . $i . ' = |
||
941 | $dt0[($' . $s . $i . ' >> 24) & 0xff] ^ |
||
942 | $dt1[($' . $s . (($Nb + $i - $c[1]) % $Nb) . ' >> 16) & 0xff] ^ |
||
943 | $dt2[($' . $s . (($Nb + $i - $c[2]) % $Nb) . ' >> 8) & 0xff] ^ |
||
944 | $dt3[ $' . $s . (($Nb + $i - $c[3]) % $Nb) . ' & 0xff] ^ |
||
945 | ' . $dw[++$wc] . ";\n"; |
||
946 | } |
||
947 | } |
||
948 | |||
949 | // Finalround: subWord + shiftRows + addRoundKey |
||
950 | for ($i = 0; $i < $Nb; ++$i) { |
||
951 | $decrypt_block .= |
||
952 | '$' . $e . $i . ' = |
||
953 | $isbox[ $' . $e . $i . ' & 0xff] | |
||
954 | ($isbox[($' . $e . $i . ' >> 8) & 0xff] << 8) | |
||
955 | ($isbox[($' . $e . $i . ' >> 16) & 0xff] << 16) | |
||
956 | ($isbox[($' . $e . $i . ' >> 24) & 0xff] << 24);' . "\n"; |
||
957 | } |
||
958 | $decrypt_block .= '$in = pack("N*"' . "\n"; |
||
959 | for ($i = 0; $i < $Nb; ++$i) { |
||
960 | $decrypt_block .= ', |
||
961 | ($' . $e . $i . ' & ' . ((int)0xFF000000) . ') ^ |
||
962 | ($' . $e . (($Nb + $i - $c[1]) % $Nb) . ' & 0x00FF0000 ) ^ |
||
963 | ($' . $e . (($Nb + $i - $c[2]) % $Nb) . ' & 0x0000FF00 ) ^ |
||
964 | ($' . $e . (($Nb + $i - $c[3]) % $Nb) . ' & 0x000000FF ) ^ |
||
965 | ' . $dw[$i] . "\n"; |
||
966 | } |
||
967 | $decrypt_block .= ');'; |
||
968 | |||
969 | $this->inline_crypt = $this->createInlineCryptFunction( |
||
970 | [ |
||
971 | 'init_crypt' => '', |
||
972 | 'init_encrypt' => $init_encrypt, |
||
973 | 'init_decrypt' => $init_decrypt, |
||
974 | 'encrypt_block' => $encrypt_block, |
||
975 | 'decrypt_block' => $decrypt_block |
||
976 | ] |
||
977 | ); |
||
978 | } |
||
979 | |||
980 | /** |
||
981 | * Encrypts a message. |
||
982 | * |
||
983 | * @see self::decrypt() |
||
984 | * @see parent::encrypt() |
||
874 | daniel-mar | 985 | * @access public |
827 | daniel-mar | 986 | * @param string $plaintext |
987 | * @return string |
||
988 | */ |
||
989 | public function encrypt($plaintext) |
||
990 | { |
||
991 | $this->setup(); |
||
992 | |||
993 | switch ($this->engine) { |
||
994 | case self::ENGINE_LIBSODIUM: |
||
995 | $this->newtag = sodium_crypto_aead_aes256gcm_encrypt($plaintext, $this->aad, $this->nonce, $this->key); |
||
996 | return Strings::shift($this->newtag, strlen($plaintext)); |
||
997 | case self::ENGINE_OPENSSL_GCM: |
||
998 | return openssl_encrypt( |
||
999 | $plaintext, |
||
1000 | 'aes-' . $this->getKeyLength() . '-gcm', |
||
1001 | $this->key, |
||
1002 | OPENSSL_RAW_DATA, |
||
1003 | $this->nonce, |
||
1004 | $this->newtag, |
||
1005 | $this->aad |
||
1006 | ); |
||
1007 | } |
||
1008 | |||
1009 | return parent::encrypt($plaintext); |
||
1010 | } |
||
1011 | |||
1012 | /** |
||
1013 | * Decrypts a message. |
||
1014 | * |
||
1015 | * @see self::encrypt() |
||
1016 | * @see parent::decrypt() |
||
874 | daniel-mar | 1017 | * @access public |
827 | daniel-mar | 1018 | * @param string $ciphertext |
1019 | * @return string |
||
1020 | */ |
||
1021 | public function decrypt($ciphertext) |
||
1022 | { |
||
1023 | $this->setup(); |
||
1024 | |||
1025 | switch ($this->engine) { |
||
1026 | case self::ENGINE_LIBSODIUM: |
||
1027 | if ($this->oldtag === false) { |
||
1028 | throw new InsufficientSetupException('Authentication Tag has not been set'); |
||
1029 | } |
||
1030 | if (strlen($this->oldtag) != 16) { |
||
1031 | break; |
||
1032 | } |
||
1033 | $plaintext = sodium_crypto_aead_aes256gcm_decrypt($ciphertext . $this->oldtag, $this->aad, $this->nonce, $this->key); |
||
1034 | if ($plaintext === false) { |
||
1035 | $this->oldtag = false; |
||
1036 | throw new BadDecryptionException('Error decrypting ciphertext with libsodium'); |
||
1037 | } |
||
1038 | return $plaintext; |
||
1039 | case self::ENGINE_OPENSSL_GCM: |
||
1040 | if ($this->oldtag === false) { |
||
1041 | throw new InsufficientSetupException('Authentication Tag has not been set'); |
||
1042 | } |
||
1043 | $plaintext = openssl_decrypt( |
||
1044 | $ciphertext, |
||
1045 | 'aes-' . $this->getKeyLength() . '-gcm', |
||
1046 | $this->key, |
||
1047 | OPENSSL_RAW_DATA, |
||
1048 | $this->nonce, |
||
1049 | $this->oldtag, |
||
1050 | $this->aad |
||
1051 | ); |
||
1052 | if ($plaintext === false) { |
||
1053 | $this->oldtag = false; |
||
1054 | throw new BadDecryptionException('Error decrypting ciphertext with OpenSSL'); |
||
1055 | } |
||
1056 | return $plaintext; |
||
1057 | } |
||
1058 | |||
1059 | return parent::decrypt($ciphertext); |
||
1060 | } |
||
1061 | } |