public override ECFieldElement Invert()
{
//return new SecP521R1FieldElement(ToBigInteger().ModInverse(Q));
uint[] z = Nat.Create(17);
SecP521R1Field.Inv(x, z);
return(new SecP521R1FieldElement(z));
}
public override ECFieldElement Divide(ECFieldElement b)
{
//return Multiply(b.Invert());
uint[] z = Nat.Create(17);
SecP521R1Field.Inv(((SecP521R1FieldElement)b).x, z);
SecP521R1Field.Multiply(z, x, z);
return(new SecP521R1FieldElement(z));
}