login sha512 hash

if ($username == $dbusername && crypt(hash('sha512'. hash('sha512', $password))) == crypt($dbpassword)) {
                $data = mysql_query("SELECT UID FROM ban WHERE Name = '$username'");
                $value = mysql_fetch_array($data);
                if ($value['baned'] == 1) {
                    header('location: locked-error.php');
                } else {
                    $_SESSION['username'] = $dbusername;
                    echo header('location: home.php');
                }