int off = nextStart - start;
            SMBUtil.writeInt4(off, dst, start + 20);
            len += dstIndex - nextStart;
        }

        if ( this.digest != null ) {
            this.digest.sign(dst, this.headerStart, this.length, this, getResponse());
        }

        if ( isRetainPayload() ) {
            this.rawPayload = new byte[len];
            System.arraycopy(dst, start, this.rawPayload, 0, len);