byte[] keyb = Hex.decode(key);
        byte[] datab = data.getBytes(StandardCharsets.US_ASCII);
        byte[] javaMac = sun.security.krb5.internal.crypto.ArcFourHmac.calculateChecksum(keyb, usage, datab, 0, datab.length);
        byte[] mac = PacMac.calculateMacArcfourHMACMD5(usage, makeKey(keyb, 23), datab);
        checkBytes(javaMac, mac);
        checkBytes(Hex.decode(expect), javaMac);