synchronized ( this.preauthIntegrityHash ) {
            this.preauthIntegrityHash = calculatePreauthHash(input, 0, input.length, this.preauthIntegrityHash);
        }
    }


    byte[] calculatePreauthHash ( byte[] input, int off, int len, byte[] oldHash ) throws CIFSException {
        if ( !this.smb2 || this.negotiated == null ) {