Function ProcRand

src/random.cpp:562–589

};

void ProcRand(unsigned char* out, int num, RNGLevel level, bool always_use_real_rng) noexcept
{
    // Make sure the RNG is initialized first (as all Seed* function possibly need hwrand to be available).
    RNGState& rng = GetRNGState();

    assert(num <= 32);

    CSHA512 hasher;
    switch (level) {
    case RNGLevel::FAST:
        SeedFast(hasher);
        break;
    case RNGLevel::SLOW:
        SeedSlow(hasher, rng);
        break;
    case RNGLevel::PERIODIC:
        SeedPeriodic(hasher, rng);
        break;
    }

    // Combine with and update state
    if (!rng.MixExtract(out, num, std::move(hasher), false, always_use_real_rng)) {
        // On the first invocation, also seed with SeedStartup().
        CSHA512 startup_hasher;
        SeedStartup(startup_hasher, rng);
        rng.MixExtract(out, num, std::move(startup_hasher), true, always_use_real_rng);
    }
}

} // namespace