private static bool TrySqrt(uint[] nc, uint[] r, uint[] t)
{
uint[] d1 = Nat224.Create();
Nat224.Copy(r, d1);
uint[] e1 = Nat224.Create();
e1[0] = 1;
uint[] f1 = Nat224.Create();
RP(nc, d1, e1, f1, t);
uint[] d0 = Nat224.Create();
uint[] e0 = Nat224.Create();
for (int k = 1; k < 96; ++k)
{
Nat224.Copy(d1, d0);
Nat224.Copy(e1, e0);
RS(d1, e1, f1, t);
if (Nat224.IsZero(d1))
{
SecP224R1Field.Inv(e0, t);
SecP224R1Field.Multiply(t, d0, t);
return(true);
}
}
return(false);
}
public override ECFieldElement Invert()
{
//return new SecP224R1FieldElement(ToBigInteger().ModInverse(Q));
uint[] z = Nat224.Create();
SecP224R1Field.Inv(x, z);
return(new SecP224R1FieldElement(z));
}
public override ECFieldElement Divide(ECFieldElement b)
{
//return Multiply(b.Invert());
uint[] z = Nat224.Create();
SecP224R1Field.Inv(((SecP224R1FieldElement)b).x, z);
SecP224R1Field.Multiply(z, x, z);
return(new SecP224R1FieldElement(z));
}
