/* this=1/this */
public void Inverse()
{
FP4 f0 = new FP4(a);
FP4 f1 = new FP4(b);
FP4 f2 = new FP4(a);
FP4 f3 = new FP4(0);
Norm();
f0.Sqr();
f1.Mul(c);
f1.Times_I();
f0.Sub(f1);
f0.Norm();
f1.Copy(c);
f1.Sqr();
f1.Times_I();
f2.Mul(b);
f1.Sub(f2);
f1.Norm();
f2.Copy(b);
f2.Sqr();
f3.Copy(a);
f3.Mul(c);
f2.Sub(f3);
f2.Norm();
f3.Copy(b);
f3.Mul(f2);
f3.Times_I();
a.Mul(f0);
f3.Add(a);
c.Mul(f1);
c.Times_I();
f3.Add(c);
f3.Norm();
f3.Inverse();
a.Copy(f0);
a.Mul(f3);
b.Copy(f1);
b.Mul(f3);
c.Copy(f2);
c.Mul(f3);
}
