Login class [error]

$db_file = SITE_ROOT . 'core/classes/db/Db.class.php';

if(is_file($db_file)) {
    require_once($db_file);
}
else {
    die(ERROR_MSG);
}

class Login {

    protected $username;
    protected $password;

    public function __constuct($username, $password) {
        $this->db = new Db();
        $this->username = $username;
        $this->password = $password;
    }

    private function Encrypt($password, $method, $salt = NULL) {
        $hashed = hash($method, $password . $salt);
        return $hashed;
    }

    private function Credentialscheck() {
        return true;
    }

    public function Login() {
        $epass = Encrypt($this->password, 'sha256', '-N9TT-9G0A-B7FQ-RANC');
        return $epass;
    }

}