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system/vendor/swift/Swift/Authenticator/CRAMMD5.php

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+<?php
+
+/**
+ * Swift Mailer CRAM-MD5 Authenticator Mechanism
+ * Please read the LICENSE file
+ * @author Chris Corbyn <chris@w3style.co.uk>
+ * @package Swift_Authenticator
+ * @license GNU Lesser General Public License
+ */
+
+require_once dirname(__FILE__) . "/../ClassLoader.php";
+Swift_ClassLoader::load("Swift_Authenticator");
+
+/**
+ * Swift CRAM-MD5 Authenticator
+ * This form of authentication is a secure challenge-response method
+ * @package Swift_Authenticator
+ * @author Chris Corbyn <chris@w3style.co.uk>
+ */
+class Swift_Authenticator_CRAMMD5 implements Swift_Authenticator
+{
+  /**
+   * Try to authenticate using the username and password
+   * Returns false on failure
+   * @param string The username
+   * @param string The password
+   * @param Swift The instance of Swift this authenticator is used in
+   * @return boolean
+   */
+  public function isAuthenticated($user, $pass, Swift $swift)
+  {
+    try {
+      $encoded_challenge = substr($swift->command("AUTH CRAM-MD5", 334)->getString(), 4);
+      $challenge = base64_decode($encoded_challenge);
+      $response = base64_encode($user . " " . self::generateCRAMMD5Hash($pass, $challenge));
+      $swift->command($response, 235);
+    } catch (Swift_ConnectionException $e) {
+      $swift->reset();
+      return false;
+    }
+    return true;
+  }
+  /**
+   * Return the name of the AUTH extension this is for
+   * @return string
+   */
+  public function getAuthExtensionName()
+  {
+    return "CRAM-MD5";
+  }
+  /**
+   * Generate a CRAM-MD5 hash from a challenge
+   * @param string The string to get a hash from
+   * @param string The challenge to use to make the hash
+   * @return string
+   */
+  public static function generateCRAMMD5Hash($password, $challenge)
+  {
+    if (strlen($password) > 64)
+      $password = pack('H32', md5($password));
+
+    if (strlen($password) < 64)
+      $password = str_pad($password, 64, chr(0));
+
+    $k_ipad = substr($password, 0, 64) ^ str_repeat(chr(0x36), 64);
+    $k_opad = substr($password, 0, 64) ^ str_repeat(chr(0x5C), 64);
+
+    $inner  = pack('H32', md5($k_ipad.$challenge));
+    $digest = md5($k_opad.$inner);
+
+    return $digest;
+  }
+}