WELL512.cs

public class WELL512
{
    private readonly uint[] State;
    private int Index;

    public WELL512(uint seed)
    {
        Index = 0;
        State = new uint[16];

        SetSeed(seed);
    }

    private void SetSeed(uint seed)
    {
        Index = 0;

        State[0] = seed;
        for (var i = 1u; i < 0x10; i++)
            State[i] = i + 0x6C078965 * (State[i - 1] ^ (State[i - 1] >> 30));
    }

    public uint NextUInt()
    {
        uint a, b, c, d;

        a = State[Index];
        c = State[(Index + 13) & 15];
        b = a ^ c ^ (a << 16) ^ (c << 15);
        c = State[(Index + 9) & 15];
        c ^= c >> 11;
        a = State[Index] = b ^ c;
        d = a ^ ((a << 5) & 0xDA442D24);
        Index = (Index + 15) & 15;
        a = State[Index];
        State[Index] = a ^ b ^ d ^ (a << 2) ^ (b << 18) ^ (c << 28);

        return State[Index];
    }
}