protected static void ImplSquare(uint[] x, uint[] zz)
{
Nat512.Square(x, zz);
uint num = x[16];
zz[32] = Nat.MulWordAddTo(16, num << 1, x, 0, zz, 16) + num * num;
}
protected static void ImplSquare(uint[] x, uint[] zz)
{
Nat512.Square(x, zz);
uint x16 = x[16];
zz[32] = Nat.MulWordAddTo(16, x16 << 1, x, 0, zz, 16) + (x16 * x16);
}