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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) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Crammd5.php 18951 2009-11-12 16:26:19Z alexander $
*/
/**
* @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) 2005-2009 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;
}
}
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