}
        int size = Encdec.dec_uint16be(this.sbuf, 2) & 0xFFFF;
        if ( size < 33 || ( 4 + size ) > this.sbuf.length ) {
            throw new IOException("Invalid payload size: " + size);
        }
        int hdrSize = this.smb2 ? Smb2Constants.SMB2_HEADER_LENGTH : SMB1_HEADER_LENGTH;
        readn(this.in, this.sbuf, 4 + hdrSize, size - hdrSize);
        log.trace("Read negotiate response");

                            response.setDigest(dgst);
                            byte[] payload = response.getRawPayload();
                            if ( !response.verifySignature(payload, 0, payload.length) ) {
                                throw new SmbException("Signature validation failed");
                            }
                        }