| 1 |  |  | <?php | 
            
                                                                                                            
                            
            
                                    
            
            
                | 2 |  |  | /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 3 |  |  | /*  AES implementation in PHP (c) Chris Veness 2005-2010. Right of free use is granted for all    */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 4 |  |  | /*    commercial or non-commercial use under CC-BY licence. No warranty of any form is offered.   */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 5 |  |  | /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 6 |  |  |  | 
            
                                                                                                            
                            
            
                                                                    
                                                                                                        
            
            
                | 7 |  | View Code Duplication | class Aes | 
                            
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                | 8 |  |  | { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 9 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 10 |  |  |      * AES Cipher function: encrypt 'input' with Rijndael algorithm | 
            
                                                                                                            
                            
            
                                    
            
            
                | 11 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 12 |  |  |      * @param input message as byte-array (16 bytes) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 13 |  |  |      * @param w     key schedule as 2D byte-array (Nr+1 x Nb bytes) - | 
            
                                                                                                            
                            
            
                                    
            
            
                | 14 |  |  |      *              generated from the cipher key by keyExpansion() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 15 |  |  |      * @return      ciphertext as byte-array (16 bytes) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 16 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 17 |  |  |     public static function cipher($input, $w) {    // main cipher function [é5.1] | 
            
                                                                                                            
                            
            
                                    
            
            
                | 18 |  |  |     $Nb = 4; // block size (in words): no of columns in state (fixed at 4 for AES) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 19 |  |  |     $Nr = count($w) / $Nb - 1; // no of rounds: 10/12/14 for 128/192/256-bit keys | 
            
                                                                                                            
                            
            
                                    
            
            
                | 20 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 21 |  |  |     $state = array(); // initialise 4xNb byte-array 'state' with input [é3.4] | 
            
                                                                                                            
                            
            
                                    
            
            
                | 22 |  |  |     for ($i = 0; $i < 4 * $Nb; $i++) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 23 |  |  |         $state[$i % 4][floor($i / 4)] = $input[$i]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 24 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 25 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 26 |  |  |     $state = self::addRoundKey($state, $w, 0, $Nb); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 27 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 28 |  |  |     for ($round = 1; $round < $Nr; $round++) {  // apply Nr rounds | 
            
                                                                                                            
                            
            
                                    
            
            
                | 29 |  |  |         $state = self::subBytes($state, $Nb); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 30 |  |  |         $state = self::shiftRows($state, $Nb); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 31 |  |  |         $state = self::mixColumns($state); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 32 |  |  |         $state = self::addRoundKey($state, $w, $round, $Nb); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 33 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 34 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 35 |  |  |     $state = self::subBytes($state, $Nb); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 36 |  |  |     $state = self::shiftRows($state, $Nb); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 37 |  |  |     $state = self::addRoundKey($state, $w, $Nr, $Nb); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 38 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 39 |  |  |     $output = array(4 * $Nb); // convert state to 1-d array before returning [é3.4] | 
            
                                                                                                            
                            
            
                                    
            
            
                | 40 |  |  |     for ($i = 0; $i < 4 * $Nb; $i++) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 41 |  |  |         $output[$i] = $state[$i % 4][floor($i / 4)]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 42 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 43 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 44 |  |  |     return $output; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 45 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 46 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 47 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 48 |  |  |      * @param integer $rnd | 
            
                                                                                                            
                            
            
                                    
            
            
                | 49 |  |  |      * @param integer $Nb | 
            
                                                                                                            
                            
            
                                    
            
            
                | 50 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 51 |  |  |     private static function addRoundKey($state, $w, $rnd, $Nb) {  // xor Round Key into state S [é5.1.4] | 
            
                                                                                                            
                            
            
                                    
            
            
                | 52 |  |  |     for ($r = 0; $r < 4; $r++) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 53 |  |  |         for ($c = 0; $c < $Nb; $c++) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 54 |  |  |             $state[$r][$c] ^= $w[$rnd * 4 + $c][$r]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 55 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 56 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 57 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 58 |  |  |     return $state; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 59 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 60 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 61 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 62 |  |  |      * @param integer $Nb | 
            
                                                                                                            
                            
            
                                    
            
            
                | 63 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 64 |  |  |     private static function subBytes($s, $Nb) {    // apply SBox to state S [é5.1.1] | 
            
                                                                                                            
                            
            
                                    
            
            
                | 65 |  |  |     for ($r = 0; $r < 4; $r++) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 66 |  |  |         for ($c = 0; $c < $Nb; $c++) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 67 |  |  |             $s[$r][$c] = self::$sBox[$s[$r][$c]]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 68 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 69 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 70 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 71 |  |  |     return $s; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 72 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 73 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 74 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 75 |  |  |      * @param integer $Nb | 
            
                                                                                                            
                            
            
                                    
            
            
                | 76 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 77 |  |  |     private static function shiftRows($s, $Nb) {    // shift row r of state S left by r bytes [é5.1.2] | 
            
                                                                                                            
                            
            
                                    
            
            
                | 78 |  |  |     $t = array(4); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 79 |  |  |     for ($r = 1; $r < 4; $r++) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 80 |  |  |         for ($c = 0; $c < 4; $c++) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 81 |  |  |             $t[$c] = $s[$r][($c + $r) % $Nb]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 82 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 83 |  |  |         // shift into temp copy | 
            
                                                                                                            
                            
            
                                    
            
            
                | 84 |  |  |         for ($c = 0; $c < 4; $c++) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 85 |  |  |             $s[$r][$c] = $t[$c]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 86 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 87 |  |  |         // and copy back | 
            
                                                                                                            
                            
            
                                    
            
            
                | 88 |  |  |     }          // note that this will work for Nb=4,5,6, but not 7,8 (always 4 for AES): | 
                            
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                | 89 |  |  |     return $s; // see fp.gladman.plus.com/cryptography_technology/rijndael/aes.spec.311.pdf | 
            
                                                                                                            
                            
            
                                    
            
            
                | 90 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 91 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 92 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 93 |  |  |      * @param integer $Nb | 
                            
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                | 94 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 95 |  |  |     private static function mixColumns($s) {   // combine bytes of each col of state S [é5.1.3] | 
            
                                                                                                            
                            
            
                                    
            
            
                | 96 |  |  |     for ($c = 0; $c < 4; $c++) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 97 |  |  |         $a = array(4); // 'a' is a copy of the current column from 's' | 
            
                                                                                                            
                            
            
                                    
            
            
                | 98 |  |  |         $b = array(4); // 'b' is aé{02} in GF(2^8) | 
                            
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                | 99 |  |  |         for ($i = 0; $i < 4; $i++) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 100 |  |  |         $a[$i] = $s[$i][$c]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 101 |  |  |         $b[$i] = $s[$i][$c] & 0x80 ? $s[$i][$c] << 1 ^ 0x011b : $s[$i][$c] << 1; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 102 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 103 |  |  |         // a[n] ^ b[n] is aé{03} in GF(2^8) | 
                            
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                | 104 |  |  |         $s[0][$c] = $b[0] ^ $a[1] ^ $b[1] ^ $a[2] ^ $a[3]; // 2*a0 + 3*a1 + a2 + a3 | 
            
                                                                                                            
                            
            
                                    
            
            
                | 105 |  |  |         $s[1][$c] = $a[0] ^ $b[1] ^ $a[2] ^ $b[2] ^ $a[3]; // a0 * 2*a1 + 3*a2 + a3 | 
            
                                                                                                            
                            
            
                                    
            
            
                | 106 |  |  |         $s[2][$c] = $a[0] ^ $a[1] ^ $b[2] ^ $a[3] ^ $b[3]; // a0 + a1 + 2*a2 + 3*a3 | 
            
                                                                                                            
                            
            
                                    
            
            
                | 107 |  |  |         $s[3][$c] = $a[0] ^ $b[0] ^ $a[1] ^ $a[2] ^ $b[3]; // 3*a0 + a1 + a2 + 2*a3 | 
            
                                                                                                            
                            
            
                                    
            
            
                | 108 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 109 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 110 |  |  |     return $s; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 111 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 112 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 113 |  |  |     /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 114 |  |  |      * Key expansion for Rijndael cipher(): performs key expansion on cipher key | 
            
                                                                                                            
                            
            
                                    
            
            
                | 115 |  |  |      * to generate a key schedule | 
            
                                                                                                            
                            
            
                                    
            
            
                | 116 |  |  |      * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 117 |  |  |      * @param key cipher key byte-array (16 bytes) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 118 |  |  |      * @return    key schedule as 2D byte-array (Nr+1 x Nb bytes) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 119 |  |  |      */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 120 |  |  |     public static function keyExpansion($key) {  // generate Key Schedule from Cipher Key [é5.2] | 
            
                                                                                                            
                            
            
                                    
            
            
                | 121 |  |  |     $Nb = 4; // block size (in words): no of columns in state (fixed at 4 for AES) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 122 |  |  |     $Nk = count($key) / 4; // key length (in words): 4/6/8 for 128/192/256-bit keys | 
            
                                                                                                            
                            
            
                                    
            
            
                | 123 |  |  |     $Nr = $Nk + 6; // no of rounds: 10/12/14 for 128/192/256-bit keys | 
            
                                                                                                            
                            
            
                                    
            
            
                | 124 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 125 |  |  |     $w = array(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 126 |  |  |     $temp = array(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 127 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 128 |  |  |     for ($i = 0; $i < $Nk; $i++) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 129 |  |  |         $r = array($key[4 * $i], $key[4 * $i + 1], $key[4 * $i + 2], $key[4 * $i + 3]); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 130 |  |  |         $w[$i] = $r; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 131 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 132 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 133 |  |  |     for ($i = $Nk; $i < ($Nb * ($Nr + 1)); $i++) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 134 |  |  |         $w[$i] = array(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 135 |  |  |         for ($t = 0; $t < 4; $t++) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 136 |  |  |             $temp[$t] = $w[$i - 1][$t]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 137 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 138 |  |  |         if ($i % $Nk == 0) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 139 |  |  |         $temp = self::subWord(self::rotWord($temp)); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 140 |  |  |         for ($t = 0; $t < 4; $t++) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 141 |  |  |             $temp[$t] ^= self::$rCon[$i / $Nk][$t]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 142 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 143 |  |  |         } elseif ($Nk > 6 && $i % $Nk == 4) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 144 |  |  |         $temp = self::subWord($temp); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 145 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 146 |  |  |         for ($t = 0; $t < 4; $t++) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 147 |  |  |             $w[$i][$t] = $w[$i - $Nk][$t] ^ $temp[$t]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 148 |  |  |         } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 149 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 150 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 151 |  |  |     return $w; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 152 |  |  |     } | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 153 |  |  |  | 
            
                                                                        
                            
            
                                    
            
            
                | 154 |  |  |     private static function subWord($w) {    // apply SBox to 4-byte word w | 
            
                                                                        
                            
            
                                    
            
            
                | 155 |  |  |     for ($i = 0; $i < 4; $i++) { | 
            
                                                                        
                            
            
                                    
            
            
                | 156 |  |  |         $w[$i] = self::$sBox[$w[$i]]; | 
            
                                                                        
                            
            
                                    
            
            
                | 157 |  |  |     } | 
            
                                                                        
                            
            
                                    
            
            
                | 158 |  |  |  | 
            
                                                                        
                            
            
                                    
            
            
                | 159 |  |  |     return $w; | 
            
                                                                        
                            
            
                                    
            
            
                | 160 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 161 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 162 |  |  |     private static function rotWord($w) {    // rotate 4-byte word w left by one byte | 
            
                                                                                                            
                            
            
                                    
            
            
                | 163 |  |  |     $tmp = $w[0]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 164 |  |  |     for ($i = 0; $i < 3; $i++) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 165 |  |  |         $w[$i] = $w[$i + 1]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 166 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 167 |  |  |     $w[3] = $tmp; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 168 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 169 |  |  |     return $w; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 170 |  |  |     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 171 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 172 |  |  |     // sBox is pre-computed multiplicative inverse in GF(2^8) used in subBytes and keyExpansion [é5.1.1] | 
            
                                                                                                            
                            
            
                                    
            
            
                | 173 |  |  |     private static $sBox = array( | 
            
                                                                                                            
                            
            
                                    
            
            
                | 174 |  |  |     0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 175 |  |  |     0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 176 |  |  |     0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 177 |  |  |     0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 178 |  |  |     0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 179 |  |  |     0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 180 |  |  |     0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 181 |  |  |     0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 182 |  |  |     0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 183 |  |  |     0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 184 |  |  |     0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 185 |  |  |     0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 186 |  |  |     0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 187 |  |  |     0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 188 |  |  |     0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 189 |  |  |     0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 190 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 191 |  |  |     // rCon is Round Constant used for the Key Expansion [1st col is 2^(r-1) in GF(2^8)] [é5.2] | 
            
                                                                                                            
                            
            
                                    
            
            
                | 192 |  |  |     private static $rCon = array( | 
            
                                                                                                            
                            
            
                                    
            
            
                | 193 |  |  |     array(0x00, 0x00, 0x00, 0x00), | 
            
                                                                                                            
                            
            
                                    
            
            
                | 194 |  |  |     array(0x01, 0x00, 0x00, 0x00), | 
            
                                                                                                            
                            
            
                                    
            
            
                | 195 |  |  |     array(0x02, 0x00, 0x00, 0x00), | 
            
                                                                                                            
                            
            
                                    
            
            
                | 196 |  |  |     array(0x04, 0x00, 0x00, 0x00), | 
            
                                                                                                            
                            
            
                                    
            
            
                | 197 |  |  |     array(0x08, 0x00, 0x00, 0x00), | 
            
                                                                                                            
                            
            
                                    
            
            
                | 198 |  |  |     array(0x10, 0x00, 0x00, 0x00), | 
            
                                                                                                            
                            
            
                                    
            
            
                | 199 |  |  |     array(0x20, 0x00, 0x00, 0x00), | 
            
                                                                                                            
                            
            
                                    
            
            
                | 200 |  |  |     array(0x40, 0x00, 0x00, 0x00), | 
            
                                                                                                            
                            
            
                                    
            
            
                | 201 |  |  |     array(0x80, 0x00, 0x00, 0x00), | 
            
                                                                                                            
                            
            
                                    
            
            
                | 202 |  |  |     array(0x1b, 0x00, 0x00, 0x00), | 
            
                                                                                                            
                            
            
                                    
            
            
                | 203 |  |  |     array(0x36, 0x00, 0x00, 0x00)); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 204 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 205 |  |  | } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 206 |  |  |  | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 207 |  |  | /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  */ | 
            
                                                        
            
                                    
            
            
                | 208 |  |  |  | 
            
                        
Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation.
You can also find more detailed suggestions in the “Code” section of your repository.