public static uint[] FromBigInteger(BigInteger x)
{
if (x.SignValue < 0 || x.BitLength > 224)
{
throw new ArgumentException();
}
uint[] array = Nat224.Create();
int num = 0;
while (x.SignValue != 0)
{
array[num++] = (uint)x.IntValue;
x = x.ShiftRight(32);
}
return(array);
}
public static void Mul(uint[] x, uint[] y, uint[] zz)
{
Nat224.Mul(x, y, zz);
Nat224.Mul(x, 7, y, 7, zz, 14);
uint c21 = Nat224.AddToEachOther(zz, 7, zz, 14);
uint c14 = c21 + Nat224.AddTo(zz, 0, zz, 7, 0);
c21 += Nat224.AddTo(zz, 21, zz, 14, c14);
uint[] dx = Nat224.Create(), dy = Nat224.Create();
bool neg = Nat224.Diff(x, 7, x, 0, dx, 0) != Nat224.Diff(y, 7, y, 0, dy, 0);
uint[] tt = Nat224.CreateExt();
Nat224.Mul(dx, dy, tt);
c21 += neg ? Nat.AddTo(14, tt, 0, zz, 7) : (uint)Nat.SubFrom(14, tt, 0, zz, 7);
Nat.AddWordAt(28, c21, zz, 21);
}
public static void Square(uint[] x, uint[] zz)
{
Nat224.Square(x, zz);
Nat224.Square(x, 7, zz, 14);
uint c21 = Nat224.AddToEachOther(zz, 7, zz, 14);
uint c14 = c21 + Nat224.AddTo(zz, 0, zz, 7, 0);
c21 += Nat224.AddTo(zz, 21, zz, 14, c14);
uint[] dx = Nat224.Create();
Nat224.Diff(x, 7, x, 0, dx, 0);
uint[] tt = Nat224.CreateExt();
Nat224.Square(dx, tt);
c21 += (uint)Nat.SubFrom(14, tt, 0, zz, 7);
Nat.AddWordAt(28, c21, zz, 21);
}