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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. */ /** * Handles CRAM-MD5 authentication. * * @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'; } /** * {@inheritdoc} */ public function authenticate(Swift_Transport_SmtpAgent $agent, $username, $password) { try { $challenge = $agent->executeCommand("AUTH CRAM-MD5\r\n", [334]); $challenge = base64_decode(substr($challenge, 4)); $message = base64_encode( $username.' '.$this->getResponse($password, $challenge) ); $agent->executeCommand(sprintf("%s\r\n", $message), [235]); return true; } catch (Swift_TransportException $e) { $agent->executeCommand("RSET\r\n", [250]); throw $e; } } /** * 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; } }