<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

 * This source file is subject to the new BSD license that is bundled

 * with this package in the file LICENSE.txt.

 * It is also available through the world-wide-web at this URL:

 * http://framework.zend.com/license/new-bsd

 * If you did not receive a copy of the license and are unable to

 * obtain it through the world-wide-web, please send an email

 * to license@zend.com so we can send you a copy immediately.

 *

 * @category   Zend

 * @package    Zend_Filter

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @version    $Id: Encrypt.php 20096 2010-01-06 02:05:09Z bkarwin $

 */

/**

 * @see Zend_Filter_Interface

 */

require_once 'Zend/Filter/Interface.php';

/**

 * @see Zend_Loader

 */

require_once 'Zend/Loader.php';

/**

 * Encrypts a given string

 *

 * @category   Zend

 * @package    Zend_Filter

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

class Zend_Filter_Encrypt implements Zend_Filter_Interface

{

    /**

     * Encryption adapter

     */

    protected $_adapter;

    /**

     * Class constructor

     *

     * @param string|array $options (Optional) Options to set, if null mcrypt is used

     */

    public function __construct($options = null)

    {

        if ($options instanceof Zend_Config) {

            $options = $options->toArray();

        }

        $this->setAdapter($options);

    }

    /**

     * Returns the name of the set adapter

     *

     * @return string

     */

    public function getAdapter()

    {

        return $this->_adapter->toString();

    }

    /**

     * Sets new encryption options

     *

     * @param  string|array $options (Optional) Encryption options

     * @return Zend_Filter_Encrypt

     */

    public function setAdapter($options = null)

    {

        if (is_string($options)) {

            $adapter = $options;

        } else if (isset($options['adapter'])) {

            $adapter = $options['adapter'];

            unset($options['adapter']);

        } else {

            $adapter = 'Mcrypt';

        }

        if (!is_array($options)) {

            $options = array();

        }

        if (Zend_Loader::isReadable('Zend/Filter/Encrypt/' . ucfirst($adapter). '.php')) {

            $adapter = 'Zend_Filter_Encrypt_' . ucfirst($adapter);

        }

        if (!class_exists($adapter)) {

            Zend_Loader::loadClass($adapter);

        }

        $this->_adapter = new $adapter($options);

        if (!$this->_adapter instanceof Zend_Filter_Encrypt_Interface) {

            require_once 'Zend/Filter/Exception.php';

            throw new Zend_Filter_Exception("Encoding adapter '" . $adapter . "' does not implement Zend_Filter_Encrypt_Interface");

        }

        return $this;

    }

    /**

     * Calls adapter methods

     *

     * @param string       $method  Method to call

     * @param string|array $options Options for this method

     */

    public function __call($method, $options)

    {

        $part = substr($method, 0, 3);

        if ((($part != 'get') and ($part != 'set')) or !method_exists($this->_adapter, $method)) {

            require_once 'Zend/Filter/Exception.php';

            throw new Zend_Filter_Exception("Unknown method '{$method}'");

        }

        return call_user_func_array(array($this->_adapter, $method), $options);

    }

    /**

     * Defined by Zend_Filter_Interface

     *

     * Encrypts the content $value with the defined settings

     *

     * @param  string $value Content to encrypt

     * @return string The encrypted content

     */

    public function filter($value)

    {

        return $this->_adapter->encrypt($value);

    }

}