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<?php
/*
* This file is part of SwiftMailer.
* (c) 2004-2009 Chris Corbyn
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
//@require 'Swift/Transport/Esmtp/Authenticator.php';
//@require 'Swift/Transport/SmtpAgent.php';
//@require 'Swift/TransportException.php';
/**
* Handles CRAM-MD5 authentication.
* @package Swift
* @subpackage Transport
* @author Chris Corbyn
*/
class Swift_Transport_Esmtp_Auth_CramMd5Authenticator
implements Swift_Transport_Esmtp_Authenticator
{
/**
* Get the name of the AUTH mechanism this Authenticator handles.
* @return string
*/
public function getAuthKeyword()
{
return 'CRAM-MD5';
}
/**
* Try to authenticate the user with $username and $password.
* @param Swift_Transport_SmtpAgent $agent
* @param string $username
* @param string $password
* @return boolean
*/
public function authenticate(Swift_Transport_SmtpAgent $agent,
$username, $password)
{
try
{
$challenge = $agent->executeCommand("AUTH CRAM-MD5\r\n", array(334));
$challenge = base64_decode(substr($challenge, 4));
$message = base64_encode(
$username . ' ' . $this->_getResponse($password, $challenge)
);
$agent->executeCommand(sprintf("%s\r\n", $message), array(235));
return true;
}
catch (Swift_TransportException $e)
{
$agent->executeCommand("RSET\r\n", array(250));
return false;
}
}
/**
* Generate a CRAM-MD5 response from a server challenge.
* @param string $secret
* @param string $challenge
* @return string
*/
private function _getResponse($secret, $challenge)
{
if (strlen($secret) > 64)
{
$secret = pack('H32', md5($secret));
}
if (strlen($secret) < 64)
{
$secret = str_pad($secret, 64, chr(0));
}
$k_ipad = substr($secret, 0, 64) ^ str_repeat(chr(0x36), 64);
$k_opad = substr($secret, 0, 64) ^ str_repeat(chr(0x5C), 64);
$inner = pack('H32', md5($k_ipad . $challenge));
$digest = md5($k_opad . $inner);
return $digest;
}
}
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