System.arraycopy(this.sbuf, 4, negoReqBuffer, 0, reqLen);
            }

            negotiatePeek();

            r = smb2neg.initResponse(getContext());
            int respLen = r.decode(this.sbuf, 4);
            r.received();

            if ( doPreauth ) {
                negoRespBuffer = new byte[respLen];
                System.arraycopy(this.sbuf, 4, negoRespBuffer, 0, respLen);

                if ( sk != null ) {
                    // session key is truncated to 16 bytes, right padded with 0 if shorter
                    byte[] key = new byte[16];
                    System.arraycopy(sk, 0, key, 0, Math.min(16, sk.length));
                    this.sessionKey = key;
                }

                boolean signed = response != null && response.isSigned();