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 <?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_Mail
  * @subpackage Protocol
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 
 /**
  * @see Zend_Mail_Protocol_Smtp
  */
 // require_once 'Zend/Mail/Protocol/Smtp.php';
 
 
 /**
  * Performs CRAM-MD5 authentication
  *
  * @category   Zend
  * @package    Zend_Mail
  * @subpackage Protocol
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Mail_Protocol_Smtp_Auth_Crammd5 extends Zend_Mail_Protocol_Smtp
 {
     /**
      * Constructor.
      *
      * @param  string $host   (Default: 127.0.0.1)
      * @param  int    $port   (Default: null)
      * @param  array  $config Auth-specific parameters
      * @return void
      */
     public function __construct($host = '127.0.0.1', $port = null, $config = null)
     {
         if (is_array($config)) {
             if (isset($config['username'])) {
                 $this->_username = $config['username'];
             }
             if (isset($config['password'])) {
                 $this->_password = $config['password'];
             }
         }
 
         parent::__construct($host, $port, $config);
     }
 
 
     /**
      * @todo Perform CRAM-MD5 authentication with supplied credentials
      *
      * @return void
      */
     public function auth()
     {
         // Ensure AUTH has not already been initiated.
         parent::auth();
 
         $this->_send('AUTH CRAM-MD5');
         $challenge = $this->_expect(334);
         $challenge = base64_decode($challenge);
         $digest = $this->_hmacMd5($this->_password, $challenge);
         $this->_send(base64_encode($this->_username . ' ' . $digest));
         $this->_expect(235);
         $this->_auth = true;
     }
 
 
     /**
      * Prepare CRAM-MD5 response to server's ticket
      *
      * @param  string $key   Challenge key (usually password)
      * @param  string $data  Challenge data
      * @param  string $block Length of blocks
      * @return string
      */
     protected function _hmacMd5($key, $data, $block = 64)
     {
         if (strlen($key) > 64) {
             $key = pack('H32', md5($key));
         } elseif (strlen($key) < 64) {
             $key = str_pad($key, $block, "\0");
         }
 
         $k_ipad = substr($key, 0, 64) ^ str_repeat(chr(0x36), 64);
         $k_opad = substr($key, 0, 64) ^ str_repeat(chr(0x5C), 64);
 
         $inner = pack('H32', md5($k_ipad . $data));
         $digest = md5($k_opad . $inner);
 
         return $digest;
     }
 }