if (request.getDigest() != null) {
                    /* success - install the signing digest */
                    setDigest(request.getDigest());
                } else if (!anonymous && isSignatureSetupRequired()) {
                    throw new SmbException("Signing required but no session key available");
                }

                setSessionSetup(response);

        final byte[] buffer = this.getContext().getBufferCache().getBuffer();
        try {
            // synchronize around encode and write so that the ordering for SMB1 signing can be maintained
            synchronized (this.outLock) {
                final int n = smb.encode(buffer, 4);
                Encdec.enc_uint32be(n & 0xFFFF, buffer, 0); /* 4 byte session message header */