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- <?php
- /**
- * PHPExcel
- *
- * Copyright (c) 2006 - 2014 PHPExcel
- *
- * 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 PHPExcel
- * @package PHPExcel_Reader_Excel5
- * @copyright Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
- * @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
- * @version ##VERSION##, ##DATE##
- */
- /**
- * PHPExcel_Reader_Excel5_RC4
- *
- * @category PHPExcel
- * @package PHPExcel_Reader_Excel5
- * @copyright Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
- */
- class PHPExcel_Reader_Excel5_RC4
- {
- // Context
- var $s = array();
- var $i = 0;
- var $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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