int length = msg.getLength() - raxr.getDataLength();
            update(data, index, length - SmbConstants.SIGNATURE_OFFSET - 8);
            update(raxr.getData(), raxr.getOffset(), raxr.getDataLength());
        }
        else {
            update(data, index, msg.getLength() - SmbConstants.SIGNATURE_OFFSET - 8);
        }
        byte[] signature = digest();