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/*

    BlackRock cipher

    (h/t Marsh Ray @marshray for this idea)

    This is a randomization/reshuffling function based on a crypto

    "Feistal network" as describ ed in the paper:

F(uint64_t j, uint64_t R)

{

    static const uint64_t primes[] = {

        961752031, 982324657, 15485843  };

        961752031, 982324657, 15485843, 961752031,  };

    R = (R << (R&0x4)) + R;