this(file, 0, SmbConstants.O_RDONLY, SmbConstants.DEFAULT_SHARING, false);
    }


    SmbFileInputStream ( SmbFile file, int openFlags, int access, int sharing, boolean unshared ) throws SmbException {
        this.file = file;
        this.unsharedFile = unshared;
        this.openFlags = openFlags;
        this.access = access;
        this.sharing = sharing;

 * order. Any removal invalidates any ordering guarantees.
 *
 * <p>This class should not be assumed to be universally superior to {@code java.util.HashSet}.
 * Generally speaking, this class reduces object allocation and memory consumption at the price of
 * moderately increased constant factors of CPU. Only use this class when there is a specific reason
 * to prioritize memory over CPU.
 *

   * non-deterministic behavior at an undetermined time in the future.
   *
   * <p>Note that the fail-fast behavior of an iterator cannot be guaranteed as it is, generally
   * speaking, impossible to make any hard guarantees in the presence of unsynchronized concurrent
   * modification. Fail-fast iterators throw {@code ConcurrentModificationException} on a

            0,
            SmbConstants.DEFAULT_SHARING);
    }


    SmbFileOutputStream ( SmbFile file, boolean append, int openFlags, int access, int sharing ) throws SmbException {
        this.file = file;
        this.append = append;
        this.openFlags = openFlags;
        this.sharing = sharing;
        this.access = access | SmbConstants.FILE_WRITE_DATA;

    private SmbPipeOutputStream output;
    private SmbPipeInputStream input;

    private final String uncPath;

    private SmbTreeHandleImpl treeHandle;

    private int sharing = SmbConstants.DEFAULT_SHARING;


    /**
     * @param pipe
     */
    public SmbPipeHandleImpl ( SmbNamedPipe pipe ) {
        this.pipe = pipe;

    //                                                                              Paging
    //                                                                              ======
    @Override
    public boolean isPaging() {
        return false;
    }

    @Override
    public boolean canPagingCountLater() {
        return false;
    }

    @Override

   * {@code getStackTrace} in one main way: The {@code lazyStackTrace} call itself returns quickly
   * by delaying the per-stack-frame work until each element is accessed. Roughly speaking:
   *
   * <ul>
   *   <li>{@code getStackTrace} takes {@code stackSize} time to return but then negligible time to
   *       retrieve each element of the returned list.

   * {@code getStackTrace} in one main way: The {@code lazyStackTrace} call itself returns quickly
   * by delaying the per-stack-frame work until each element is accessed. Roughly speaking:
   *
   * <ul>
   *   <li>{@code getStackTrace} takes {@code stackSize} time to return but then negligible time to
   *       retrieve each element of the returned list.

     * 
     * @param challenge The server challenge.
     * @return A <code>byte[]</code> containing the effective user session key,
     * used in SMB MAC signing and NTLMSSP signing and sealing.
     */
    public byte[] getUserSessionKey(byte[] challenge) {
        if (hashesExternal) return null;
        byte[] key = new byte[16];
        try {
            getUserSessionKey(challenge, key, 0); 

    private static final String S2C_SEAL_CONSTANT = "session key to server-to-client sealing key magic constant";

    private static final String C2S_SIGN_CONSTANT = "session key to client-to-server signing key magic constant";
    private static final String C2S_SEAL_CONSTANT = "session key to client-to-server sealing key magic constant";

    private static final Logger log = LoggerFactory.getLogger(NtlmContext.class);