1 files changed, 81 insertions, 0 deletions
diff --git a/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/Esmtp/Auth/CramMd5Authenticator.php b/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/Esmtp/Auth/CramMd5Authenticator.php
new file mode 100644
index 0000000..53f721d
--- /dev/null
+++ b/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/Esmtp/Auth/CramMd5Authenticator.php
@@ -0,0 +1,81 @@
+<?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';
+    }
+
+    /**
+     * Try to authenticate the user with $username and $password.
+     *
+     * @param Swift_Transport_SmtpAgent $agent
+     * @param string                    $username
+     * @param string                    $password
+     *
+     * @return bool
+     */
+    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;
+    }
+}