* @param data The data.
     * @param offset The starting offset at which the SMB header begins.
     * @param length The length of the SMB data starting at offset. 
     */
    boolean verify(byte[] data, int offset, ServerMessageBlock response) {
        update(macSigningKey, 0, macSigningKey.length);
        int index = offset;
        update(data, index, ServerMessageBlock.SIGNATURE_OFFSET); 

        int offset = 0;
        if ( domainLength > 0 ) {
            writeUShort(targetInfo, offset, 2);
            offset += 2;
            writeUShort(targetInfo, offset, domainLength);
            offset += 2;
            System.arraycopy(domain, 0, targetInfo, offset, domainLength);
            offset += domainLength;
        }
        if ( serverLength > 0 ) {

            int offset = 64;
            writeSecurityBuffer(type3, 12, offset, lmResponse);
            offset += lmLength;
            writeSecurityBuffer(type3, 20, offset, ntResponse);
            offset += ntLength;
            writeSecurityBuffer(type3, 28, offset, domain);
            offset += domainLength;
            writeSecurityBuffer(type3, 36, offset, user);
            offset += userLength;

    /**
     * 
     * @param config
     * @param fid
     * @param offset
     * @param maxCount
     * @param andx
     */
    public SmbComReadAndX ( Configuration config, int fid, long offset, int maxCount, ServerMessageBlock andx ) {
        super(config, SMB_COM_READ_ANDX, andx);
        this.fid = fid;
        this.offset = offset;
        this.maxCount = this.minCount = maxCount;
        this.openTimeout = 0xFFFFFFFF;

    }


    static byte[] computeResponse ( byte[] responseKey, byte[] serverChallenge, byte[] clientData, int offset, int length ) {
        MessageDigest hmac = Crypto.getHMACT64(responseKey);
        hmac.update(serverChallenge);
        hmac.update(clientData, offset, length);
        byte[] mac = hmac.digest();
        byte[] ret = new byte[mac.length + clientData.length];

     */
    public final void setMode ( int mode ) {
        this.mode = mode;
    }


    /**
     * @param offset
     *            the offset to set
     */
    public final void setOffset ( long offset ) {
        this.offset = offset;
    }


    /**
     * {@inheritDoc}
     *
     * @see jcifs.internal.smb1.ServerMessageBlock#writeParameterWordsWireFormat(byte[], int)
     */
    @Override

     */
    @Override
    void close () throws CIFSException;


    /**
     * @return the tree is connected
     */
    boolean isConnected ();


    /**
     * @return server timezone offset
     * @throws CIFSException
     */
    long getServerTimeZoneOffset () throws CIFSException;


    /**
     * @return server reported domain name
     * @throws CIFSException
     */

     */
    int read ( byte[] b ) throws SmbException;


    /**
     * Read into buffer from current position
     * 
     * @param b
     *            buffer
     * @param off
     *            offset into buffer
     * @param len
     *            read up to <tt>len</tt> bytes
     * @return number of bytes read
     * @throws SmbException
     */
    int read ( byte[] b, int off, int len ) throws SmbException;

    private static final int NTT_PRIMARY_SETUP_OFFSET       = 69;
    private static final int NTT_SECONDARY_PARAMETER_OFFSET  = 51;

    static final int NT_TRANSACT_QUERY_SECURITY_DESC = 6;

    int function;

    SmbComNtTransaction() {
        super();
        primarySetupOffset = NTT_PRIMARY_SETUP_OFFSET;
        secondaryParameterOffset = NTT_SECONDARY_PARAMETER_OFFSET;
    }

        bufferIndex += 2;
        int ownerUOffset = ServerMessageBlock.readInt4(buffer, bufferIndex); // offset to owner sid
        bufferIndex += 4;
        int ownerGOffset = ServerMessageBlock.readInt4(buffer, bufferIndex); // offset to group sid
        bufferIndex += 4;
        int saclOffset = ServerMessageBlock.readInt4(buffer, bufferIndex); // offset to sacl
        bufferIndex += 4;