enc-part
                        etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
                        kvno: 5
                        cipher: 508c1fb7944c336ead0edf4536ba1ecf7102923d9dc9e0ab1d5c73d0d3bb4ca6a1120cdd…
                authenticator
                    etype: eTYPE-ARCFOUR-HMAC-MD5 (23)
                    cipher: e24ff60648505a37d583d77e20a845158b7cfe8c652ab16d0eeeb4c8700370e5d640bbdd…

    static final int AF_ISO = 7;

    static final int AUTH_DATA_RELEVANT = 1;
    static final int AUTH_DATA_PAC = 128;

    static final int DES_ENC_TYPE = 3;
    static final int RC4_ENC_TYPE = 23;
    static final String RC4_ALGORITHM = "ARCFOUR";
    static final String HMAC_ALGORITHM = "HmacMD5";
    static final int CONFOUNDER_SIZE = 8;
    static final int CHECKSUM_SIZE = 16;

    public static final int HMAC_SHA1_96_AES128 = 0x0000000F;
    public static final int HMAC_SHA1_96_AES256 = 0x00000010;

    public static final int ETYPE_ARCFOUR_HMAC = 23;
    public static final int ETYPE_AES128_CTS_HMAC_SHA1_96 = 17;
    public static final int ETYPE_AES256_CTS_HMAC_SHA1_96 = 18;

    private int type;
    private byte[] checksum;

        int ms_usage = keyusage;
        switch ( ms_usage ) {
        case 3:
            ms_usage = 8;
        case 9:
            ms_usage = 8;
        case 23:
            ms_usage = 13;
        }
        return ms_usage;
    }


    public static byte[] calculateMacHMACAES ( int usage, KerberosKey baseKey, byte[] input ) throws GeneralSecurityException {

        (byte)20, (byte)12, (byte) 4, (byte)27, (byte)19, (byte)11, (byte)3
    };
    private static int[] totrot = {
        1, 2, 4, 6, 8, 10, 12, 14, 15, 17, 19, 21, 23, 25, 27, 28
    };

    private static byte[] pc2 = {
        (byte)13, (byte)16, (byte)10, (byte)23, (byte) 0, (byte) 4,
        (byte) 2, (byte)27, (byte)14, (byte) 5, (byte)20, (byte) 9,
        (byte)22, (byte)18, (byte)11, (byte)3 , (byte)25, (byte) 7,

        do
        {
            int octet = s.read();
            if (octet < 0)
            {
                throw new EOFException("EOF found reading length");
            }

            if ((length >>> 23) != 0)
            {
                throw new IOException("long form definite-length more than 31 bits");
            }

            length = (length << 8) + octet;
        }