* @throws SmbException
     */
    boolean isSigningEnforced () throws SmbException;


    /**
     * @return the encryption key used by the server
     */
    byte[] getServerEncryptionKey ();


    /**
     * @param ctx
     * @return session
     */
    SmbSession getSmbSession ( CIFSContext ctx );


    /**
     * @param tf
     * @param targetHost

                .unwrap(SmbTransportInternal.class) ) {
            trans.ensureConnected();
            return trans.getServerEncryptionKey();
        }
        catch ( SmbException e ) {
            throw e;
        }
        catch ( IOException e ) {
            throw new SmbException("Connection failed", e);
        }
    }

    public SMB1SigningDigest ( SmbTransportInternal transport, NtlmPasswordAuthenticator auth ) throws SmbException {
        this.digest = Crypto.getMD5();
        try {
            byte[] serverEncryptionKey = transport.getServerEncryptionKey();
            switch ( transport.getContext().getConfig().getLanManCompatibility() ) {
            case 0:
            case 1:
            case 2:
                this.macSigningKey = new byte[40];

                    ssn.treeConnectLogon();
                }
            }
            return new NtlmChallenge(trans.getServerEncryptionKey(), dc);
        }
        catch ( SmbException e ) {
            throw e;
        }
        catch ( IOException e ) {
            throw new SmbException("Connection failed", e);
        }
    }

    public SmbTransportImpl acquire () {
        return (SmbTransportImpl) super.acquire();
    }


    /**
     * @return the server's encryption key
     */
    @Override
    public byte[] getServerEncryptionKey () {
        if ( this.negotiated == null ) {
            return null;
        }

        if ( this.negotiated instanceof SmbComNegotiateResponse ) {