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<?php |
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ |
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/* AES implementation in PHP (c) Chris Veness 2005-2010. Right of free use is granted for all */ |
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/* commercial or non-commercial use under CC-BY licence. No warranty of any form is offered. */ |
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ |
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class Aes |
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{ |
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/** |
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* AES Cipher function: encrypt 'input' with Rijndael algorithm |
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* |
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* @param input message as byte-array (16 bytes) |
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* @param w key schedule as 2D byte-array (Nr+1 x Nb bytes) - |
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* generated from the cipher key by keyExpansion() |
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* @return ciphertext as byte-array (16 bytes) |
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*/ |
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public static function cipher($input, $w) { // main cipher function [é5.1] |
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$Nb = 4; // block size (in words): no of columns in state (fixed at 4 for AES) |
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$Nr = count($w) / $Nb - 1; // no of rounds: 10/12/14 for 128/192/256-bit keys |
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$state = array(); // initialise 4xNb byte-array 'state' with input [é3.4] |
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for ($i = 0; $i < 4 * $Nb; $i++) { |
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$state[$i % 4][floor($i / 4)] = $input[$i]; |
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} |
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$state = self::addRoundKey($state, $w, 0, $Nb); |
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for ($round = 1; $round < $Nr; $round++) { // apply Nr rounds |
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$state = self::subBytes($state, $Nb); |
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$state = self::shiftRows($state, $Nb); |
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$state = self::mixColumns($state); |
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$state = self::addRoundKey($state, $w, $round, $Nb); |
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} |
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$state = self::subBytes($state, $Nb); |
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$state = self::shiftRows($state, $Nb); |
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$state = self::addRoundKey($state, $w, $Nr, $Nb); |
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$output = array(4 * $Nb); // convert state to 1-d array before returning [é3.4] |
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for ($i = 0; $i < 4 * $Nb; $i++) { |
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$output[$i] = $state[$i % 4][floor($i / 4)]; |
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} |
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return $output; |
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} |
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/** |
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* @param integer $rnd |
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* @param integer $Nb |
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*/ |
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private static function addRoundKey($state, $w, $rnd, $Nb) { // xor Round Key into state S [é5.1.4] |
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for ($r = 0; $r < 4; $r++) { |
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for ($c = 0; $c < $Nb; $c++) { |
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$state[$r][$c] ^= $w[$rnd * 4 + $c][$r]; |
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} |
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} |
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return $state; |
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} |
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/** |
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* @param integer $Nb |
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*/ |
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private static function subBytes($s, $Nb) { // apply SBox to state S [é5.1.1] |
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for ($r = 0; $r < 4; $r++) { |
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for ($c = 0; $c < $Nb; $c++) { |
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$s[$r][$c] = self::$sBox[$s[$r][$c]]; |
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} |
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} |
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return $s; |
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} |
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/** |
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* @param integer $Nb |
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*/ |
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private static function shiftRows($s, $Nb) { // shift row r of state S left by r bytes [é5.1.2] |
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$t = array(4); |
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for ($r = 1; $r < 4; $r++) { |
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for ($c = 0; $c < 4; $c++) { |
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$t[$c] = $s[$r][($c + $r) % $Nb]; |
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} |
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// shift into temp copy |
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for ($c = 0; $c < 4; $c++) { |
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$s[$r][$c] = $t[$c]; |
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} |
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// and copy back |
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} // note that this will work for Nb=4,5,6, but not 7,8 (always 4 for AES): |
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return $s; // see fp.gladman.plus.com/cryptography_technology/rijndael/aes.spec.311.pdf |
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} |
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/** |
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* @param integer $Nb |
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*/ |
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private static function mixColumns($s) { // combine bytes of each col of state S [é5.1.3] |
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for ($c = 0; $c < 4; $c++) { |
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$a = array(4); // 'a' is a copy of the current column from 's' |
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$b = array(4); // 'b' is aé{02} in GF(2^8) |
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for ($i = 0; $i < 4; $i++) { |
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$a[$i] = $s[$i][$c]; |
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$b[$i] = $s[$i][$c] & 0x80 ? $s[$i][$c] << 1 ^ 0x011b : $s[$i][$c] << 1; |
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} |
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// a[n] ^ b[n] is aé{03} in GF(2^8) |
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$s[0][$c] = $b[0] ^ $a[1] ^ $b[1] ^ $a[2] ^ $a[3]; // 2*a0 + 3*a1 + a2 + a3 |
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$s[1][$c] = $a[0] ^ $b[1] ^ $a[2] ^ $b[2] ^ $a[3]; // a0 * 2*a1 + 3*a2 + a3 |
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$s[2][$c] = $a[0] ^ $a[1] ^ $b[2] ^ $a[3] ^ $b[3]; // a0 + a1 + 2*a2 + 3*a3 |
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$s[3][$c] = $a[0] ^ $b[0] ^ $a[1] ^ $a[2] ^ $b[3]; // 3*a0 + a1 + a2 + 2*a3 |
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} |
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return $s; |
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} |
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/** |
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* Key expansion for Rijndael cipher(): performs key expansion on cipher key |
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* to generate a key schedule |
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* |
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* @param key cipher key byte-array (16 bytes) |
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* @return key schedule as 2D byte-array (Nr+1 x Nb bytes) |
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*/ |
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public static function keyExpansion($key) { // generate Key Schedule from Cipher Key [é5.2] |
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$Nb = 4; // block size (in words): no of columns in state (fixed at 4 for AES) |
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$Nk = count($key) / 4; // key length (in words): 4/6/8 for 128/192/256-bit keys |
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$Nr = $Nk + 6; // no of rounds: 10/12/14 for 128/192/256-bit keys |
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$w = array(); |
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$temp = array(); |
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for ($i = 0; $i < $Nk; $i++) { |
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$r = array($key[4 * $i], $key[4 * $i + 1], $key[4 * $i + 2], $key[4 * $i + 3]); |
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$w[$i] = $r; |
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} |
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for ($i = $Nk; $i < ($Nb * ($Nr + 1)); $i++) { |
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$w[$i] = array(); |
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for ($t = 0; $t < 4; $t++) { |
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$temp[$t] = $w[$i - 1][$t]; |
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} |
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if ($i % $Nk == 0) { |
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$temp = self::subWord(self::rotWord($temp)); |
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for ($t = 0; $t < 4; $t++) { |
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$temp[$t] ^= self::$rCon[$i / $Nk][$t]; |
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} |
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} elseif ($Nk > 6 && $i % $Nk == 4) { |
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$temp = self::subWord($temp); |
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} |
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for ($t = 0; $t < 4; $t++) { |
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$w[$i][$t] = $w[$i - $Nk][$t] ^ $temp[$t]; |
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} |
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} |
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return $w; |
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} |
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private static function subWord($w) { // apply SBox to 4-byte word w |
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for ($i = 0; $i < 4; $i++) { |
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$w[$i] = self::$sBox[$w[$i]]; |
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} |
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return $w; |
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} |
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private static function rotWord($w) { // rotate 4-byte word w left by one byte |
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$tmp = $w[0]; |
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for ($i = 0; $i < 3; $i++) { |
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$w[$i] = $w[$i + 1]; |
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} |
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$w[3] = $tmp; |
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return $w; |
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} |
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// sBox is pre-computed multiplicative inverse in GF(2^8) used in subBytes and keyExpansion [é5.1.1] |
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private static $sBox = array( |
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0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, |
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0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, |
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0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, |
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0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, |
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178
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0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, |
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0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, |
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180
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0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, |
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0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, |
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0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, |
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0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, |
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0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, |
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0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, |
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0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, |
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187
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0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, |
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188
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0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, |
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189
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0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16); |
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190
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191
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// rCon is Round Constant used for the Key Expansion [1st col is 2^(r-1) in GF(2^8)] [é5.2] |
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private static $rCon = array( |
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array(0x00, 0x00, 0x00, 0x00), |
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array(0x01, 0x00, 0x00, 0x00), |
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array(0x02, 0x00, 0x00, 0x00), |
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array(0x04, 0x00, 0x00, 0x00), |
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array(0x08, 0x00, 0x00, 0x00), |
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array(0x10, 0x00, 0x00, 0x00), |
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array(0x20, 0x00, 0x00, 0x00), |
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array(0x40, 0x00, 0x00, 0x00), |
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201
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array(0x80, 0x00, 0x00, 0x00), |
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array(0x1b, 0x00, 0x00, 0x00), |
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array(0x36, 0x00, 0x00, 0x00)); |
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} |
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ |
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nilsteampassnet /
TeamPass
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You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.