private static final byte[] SIGNCONTEXT_300 = toCBytes("SmbSign");
    private static final byte[] SIGNLABEL_300 = toCBytes("SMB2AESCMAC");
    private static final byte[] SIGNLABEL_311 = toCBytes("SMBSigningKey");

    private static final byte[] APPCONTEXT_300 = toCBytes("SmbRpc");
    private static final byte[] APPLABEL_300 = toCBytes("SMB2APP");
    private static final byte[] APPLABEL_311 = toCBytes("SMBAppKey");

    }

    /**
     * Convert the GUID to byte array for wire format (little-endian as per MS-SMB2)
     * @return 16-byte array representing the GUID in SMB wire format
     */
    public byte[] toBytes() {
        byte[] result = new byte[16];
        ByteBuffer bb = ByteBuffer.wrap(result).order(java.nio.ByteOrder.LITTLE_ENDIAN);

        long mostSig = guid.getMostSignificantBits();

        dstIndex += 4;

        SMBUtil.writeInt8(0, dst, dstIndex); // Reserved (8 bytes)
        dstIndex += 8;

        System.arraycopy(createGuid.toBytes(), 0, dst, dstIndex, 16); // CreateGuid (16 bytes)
        dstIndex += 16;

        return dstIndex - start;
    }