<?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) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com) * @license    http://framework.zend.com/license/new-bsd     New BSD License * @version    $Id: Crammd5.php 8064 2008-02-16 10:58:39Z thomas $ *//** * @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) 2005-2008 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, chr(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;    }}