int start = bufferIndex;
        int structureSize = SMBUtil.readInt2(buffer, bufferIndex);
        if ( structureSize != 17 ) {
            throw new SMBProtocolDecodingException("Expected structureSize = 17");
        }
        bufferIndex += 4;

        this.count = SMBUtil.readInt4(buffer, bufferIndex);
        bufferIndex += 4;

                + "00000000000000000000000000000000000";
        String key = "B3B88E34BF46A69FC7C3FA14A09A3C918FF9BE3183FCDB995BA64E5628735C93";

        verifyAESMAC(17, expect, data, key);
    }


    public void testPACArcfourChecksum () throws GeneralSecurityException {
        String expect = "8CA2EC211EF808390C9F0C3F32D0C4AF";

     * @throws PACDecodingException
     */
    public static byte[] calculateMac ( int type, Map<Integer, KerberosKey> keys, byte[] data ) throws PACDecodingException {
        try {
            int usage = 17;
            if ( type == PacSignature.KERB_CHECKSUM_HMAC_MD5 ) {
                KerberosKey key = keys.get(PacSignature.ETYPE_ARCFOUR_HMAC);
                if ( key == null ) {

    static final int FILE_READ_ATTRIBUTES = 0x00000080; // 8
    static final int FILE_WRITE_ATTRIBUTES = 0x00000100; // 9
    static final int DELETE = 0x00010000; // 16
    static final int READ_CONTROL = 0x00020000; // 17
    static final int WRITE_DAC = 0x00040000; // 18
    static final int WRITE_OWNER = 0x00080000; // 19
    static final int SYNCHRONIZE = 0x00100000; // 20
    static final int GENERIC_ALL = 0x10000000; // 28

    static final int FILE_WRITE_ATTRIBUTES = 0x00000100; // 9
    static final int DELETE                = 0x00010000; // 16
    static final int READ_CONTROL          = 0x00020000; // 17
    static final int WRITE_DAC             = 0x00040000; // 18
    static final int WRITE_OWNER           = 0x00080000; // 19
    static final int SYNCHRONIZE           = 0x00100000; // 20

        if ( structureSize == 9 ) {
            return this.readErrorResponse(buffer, bufferIndex);
        }
        else if ( structureSize != 17 ) {
            throw new SMBProtocolDecodingException("Expected structureSize = 17");
        }

        short dataOffset = buffer[ bufferIndex + 2 ];
        bufferIndex += 4;
        this.dataLength = SMBUtil.readInt4(buffer, bufferIndex);

    static final int DEVICE_CLAIMS_TYPE = 0xF;

    static final int LOGON_EXTRA_SIDS = 0x20;
    static final int LOGON_RESOURCE_GROUPS = 0x200;

    static final int MD5_KRB_SALT = 17;
    static final int MD5_BLOCK_LENGTH = 64;

    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;


    public PacSignature ( byte[] data ) throws PACDecodingException {
        try {

    /**
     * 
     */
    public static final int DELETE = 0x00010000; // 16
    /**
     * 
     */
    public static final int READ_CONTROL = 0x00020000; // 17
    /**
     * 
     */
    public static final int WRITE_DAC = 0x00040000; // 18
    /**
     * 
     */
    public static final int WRITE_OWNER = 0x00080000; // 19
    /**
     * 
     */

    };
    private static byte[] pc1 = {
        (byte)56, (byte)48, (byte)40, (byte)32, (byte)24, (byte)16, (byte) 8,
        (byte) 0, (byte)57, (byte)49, (byte)41, (byte)33, (byte)25, (byte)17,
        (byte) 9, (byte) 1, (byte)58, (byte)50, (byte)42, (byte)34, (byte)26,
        (byte)18, (byte)10, (byte) 2, (byte)59, (byte)51, (byte)43, (byte)35,