public static function signParameters($oldparms, $endpoint, $method,
        $submit_text = false, $org_id = false, $org_desc = false) {

        $oauth_consumer_key = self::ltiParameter('key_key');
        $oauth_consumer_secret = self::decrypt_secret(self::ltiParameter('secret'));

        return LTI::signParameters($oldparms, $endpoint, $method, $oauth_consumer_key, $oauth_consumer_secret,
            $submit_text, $org_id, $org_desc);
    }