/* construct this from (x,y) - but set to O if not on curve */
public ECP2(FP2 ix, FP2 iy)
{
x = new FP2(ix);
y = new FP2(iy);
z = new FP2(1);
FP2 rhs = RHS(x);
FP2 y2 = new FP2(y);
y2.sqr();
if (y2.Equals(rhs))
{
INF = false;
}
else
{
x.zero();
INF = true;
}
}
/* Test if P == Q */
public bool Equals(ECP2 Q)
{
if (is_infinity() && Q.is_infinity())
{
return(true);
}
if (is_infinity() || Q.is_infinity())
{
return(false);
}
FP2 zs2 = new FP2(z);
zs2.sqr();
FP2 zo2 = new FP2(Q.z);
zo2.sqr();
FP2 zs3 = new FP2(zs2);
zs3.mul(z);
FP2 zo3 = new FP2(zo2);
zo3.mul(Q.z);
zs2.mul(Q.x);
zo2.mul(x);
if (!zs2.Equals(zo2))
{
return(false);
}
zs3.mul(Q.y);
zo3.mul(y);
if (!zs3.Equals(zo3))
{
return(false);
}
return(true);
}
/* set to Affine - (x,y,z) to (x,y) */
public void affine()
{
if (is_infinity())
{
return;
}
FP2 one = new FP2(1);
if (z.Equals(one))
{
return;
}
z.inverse();
FP2 z2 = new FP2(z);
z2.sqr();
x.mul(z2);
x.reduce();
y.mul(z2);
y.mul(z);
y.reduce();
z.copy(one);
}
/* test this=x? */
public bool Equals(FP4 x)
{
return(a.Equals(x.a) && b.Equals(x.b));
}
/* test this==1 ? */
public bool IsUnity()
{
FP2 one = new FP2(1);
return(a.Equals(one) && b.IsZilch());
}
/* test this==1 ? */
public bool isunity()
{
FP2 one = new FP2(1);
return(a.Equals(one) && b.iszilch());
}
