update(data, offset, length);
            System.arraycopy(digest(), 0, data, index, 8);
            if (bypass) {
                bypass = false;
                System.arraycopy("BSRSPYL ".getBytes(), 0, data, index, 8);
            }
        } catch (Exception ex) {
            if( log.level > 0 )
                ex.printStackTrace( log );
        } finally {
            signSequence += 2;