public function login($username, $password)
{
    if ($username == "" || $password == "")
        return false;

    $adapter = new \Application_Security_Auth_Adapter();

    $adapter->setIdentity($username);
    $adapter->setCredential($password);

    $auth = \Zend_Auth::getInstance();
    $result = $auth->authenticate($adapter);

    return $result->isValid();
}