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<?php |
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/** |
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* PHPExcel |
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* |
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* Copyright (c) 2006 - 2014 PHPExcel |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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* |
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* @category PHPExcel |
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* @package PHPExcel_Reader_Excel5 |
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* @copyright Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel) |
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* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL |
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* @version ##VERSION##, ##DATE## |
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*/ |
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|
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/** |
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* PHPExcel_Reader_Excel5_RC4 |
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* |
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* @category PHPExcel |
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* @package PHPExcel_Reader_Excel5 |
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* @copyright Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel) |
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*/ |
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class PHPExcel_Reader_Excel5_RC4 |
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{ |
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// Context |
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var $s = array(); |
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var $i = 0; |
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var $j = 0; |
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|
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/** |
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* RC4 stream decryption/encryption constrcutor |
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* |
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* @param string $key Encryption key/passphrase |
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*/ |
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public function __construct($key) |
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{ |
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$len = strlen($key); |
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|
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for ($this->i = 0; $this->i < 256; $this->i++) { |
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$this->s[$this->i] = $this->i; |
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} |
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|
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$this->j = 0; |
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for ($this->i = 0; $this->i < 256; $this->i++) { |
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$this->j = ($this->j + $this->s[$this->i] + ord($key[$this->i % $len])) % 256; |
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$t = $this->s[$this->i]; |
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$this->s[$this->i] = $this->s[$this->j]; |
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$this->s[$this->j] = $t; |
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} |
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$this->i = $this->j = 0; |
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} |
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|
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/** |
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* Symmetric decryption/encryption function |
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* |
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* @param string $data Data to encrypt/decrypt |
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* |
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* @return string |
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*/ |
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public function RC4($data) |
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{ |
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$len = strlen($data); |
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for ($c = 0; $c < $len; $c++) { |
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$this->i = ($this->i + 1) % 256; |
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$this->j = ($this->j + $this->s[$this->i]) % 256; |
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$t = $this->s[$this->i]; |
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$this->s[$this->i] = $this->s[$this->j]; |
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$this->s[$this->j] = $t; |
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|
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$t = ($this->s[$this->i] + $this->s[$this->j]) % 256; |
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|
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$data[$c] = chr(ord($data[$c]) ^ $this->s[$t]); |
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} |
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return $data; |
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} |
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} |
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|
