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<?php namespace PhpOffice\PhpSpreadsheet\Reader\Xls; /** * Copyright (c) 2006 - 2016 PhpSpreadsheet. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * @category PhpSpreadsheet * * @copyright Copyright (c) 2006 - 2016 PhpSpreadsheet (https://github.com/PHPOffice/PhpSpreadsheet) * @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL */ class RC4 { // Context protected $s = []; protected $i = 0; protected $j = 0; /** * RC4 stream decryption/encryption constrcutor. * * @param string $key Encryption key/passphrase */ public function __construct($key) { $len = strlen($key); for ($this->i = 0; $this->i < 256; ++$this->i) { $this->s[$this->i] = $this->i; } $this->j = 0; for ($this->i = 0; $this->i < 256; ++$this->i) { $this->j = ($this->j + $this->s[$this->i] + ord($key[$this->i % $len])) % 256; $t = $this->s[$this->i]; $this->s[$this->i] = $this->s[$this->j]; $this->s[$this->j] = $t; } $this->i = $this->j = 0; } /** * Symmetric decryption/encryption function. * * @param string $data Data to encrypt/decrypt * * @return string */ public function RC4($data) { $len = strlen($data); for ($c = 0; $c < $len; ++$c) { $this->i = ($this->i + 1) % 256; $this->j = ($this->j + $this->s[$this->i]) % 256; $t = $this->s[$this->i]; $this->s[$this->i] = $this->s[$this->j]; $this->s[$this->j] = $t; $t = ($this->s[$this->i] + $this->s[$this->j]) % 256; $data[$c] = chr(ord($data[$c]) ^ $this->s[$t]); } return $data; } }
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