int msbit = ((ilen << 3) - 1 + ((ilen << 3) + 13) * (i / ilen) + (ilen - i % ilen << 3)) % (ilen << 3);
        int mshigh = msbit >>> 3, mslow = msbit & 7;
        int b = c + (out[i % olen] & 0xff)
                + (((data[(ilen - 1 - mshigh) % ilen] & 0xff) << 8 | data[(ilen - mshigh) % ilen] & 0xff) >>> mslow + 1 & 0xff);
        out[i % olen] = (byte) (b & 0xff);
        return b >>>= 8;
    }

    private static int lcm(int u, int v) {