Pimcore\Tool\Authentication::generateToken PHP Method

    public static function generateToken($username, $passwordHash)
    {
        $data = time() - 1 . '|' . $username;
        $token = Crypto::encryptWithPassword($data, $passwordHash);
        return $token;
    }

 public function lostpasswordAction()
 {
     $username = $this->getParam("username");
     if ($username) {
         $user = User::getByName($username);
         if (!$user instanceof User) {
             $this->view->error = "user unknown";
         } else {
             if ($user->isActive()) {
                 if ($user->getEmail()) {
                     $token = Tool\Authentication::generateToken($username, $user->getPassword());
                     $uri = $this->getRequest()->getScheme() . "://" . $this->getRequest()->getHttpHost();
                     $loginUrl = $uri . "/admin/login/login/?username="******"&token=" . $token . "&reset=true";
                     try {
                         $mail = Tool::getMail(array($user->getEmail()), "Pimcore lost password service");
                         $mail->setIgnoreDebugMode(true);
                         $mail->setBodyText("Login to pimcore and change your password using the following link. This temporary login link will expire in 30 minutes: \r\n\r\n" . $loginUrl);
                         $mail->send();
                         $this->view->success = true;
                     } catch (\Exception $e) {
                         $this->view->error = "could not send email";
                     }
                 } else {
                     $this->view->error = "user has no email address";
                 }
             } else {
                 $this->view->error = "user inactive";
             }
         }
     }
 }