<?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_InfoCard

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

 */

/**

 * Zend_InfoCard_Xml_KeyInfo_Abstract

 */

require_once 'Zend/InfoCard/Xml/KeyInfo/Abstract.php';

/**

 * Zend_InfoCard_Xml_EncryptedKey

 */

require_once 'Zend/InfoCard/Xml/EncryptedKey.php';

/**

 * Zend_InfoCard_Xml_KeyInfo_Interface

 */

require_once 'Zend/InfoCard/Xml/KeyInfo/Interface.php';

/**

 * Represents a Xml Digital Signature XML Data Block

 *

 * @category   Zend

 * @package    Zend_InfoCard

 * @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_InfoCard_Xml_KeyInfo_XmlDSig

    extends Zend_InfoCard_Xml_KeyInfo_Abstract

    implements Zend_InfoCard_Xml_KeyInfo_Interface

{

    /**

     * Returns an instance of the EncryptedKey Data Block

     *

     * @throws Zend_InfoCard_Xml_Exception

     * @return Zend_InfoCard_Xml_EncryptedKey

     */

    public function getEncryptedKey()

    {

        $this->registerXPathNamespace('e', 'http://www.w3.org/2001/04/xmlenc#');

        list($encryptedkey) = $this->xpath('//e:EncryptedKey');

        if(!($encryptedkey instanceof Zend_InfoCard_Xml_Element)) {

            throw new Zend_InfoCard_Xml_Exception("Failed to retrieve encrypted key");

        }

        return Zend_InfoCard_Xml_EncryptedKey::getInstance($encryptedkey);

    }

    /**

     * Returns the KeyInfo Block within the encrypted key

     *

     * @return Zend_InfoCard_Xml_KeyInfo_Default

     */

    public function getKeyInfo()

    {

        return $this->getEncryptedKey()->getKeyInfo();

    }

}