/* Multiply P by e in group G2 */
public static ECP2 G2Mul(ECP2 P, BIG e)
{
ECP2 R;
if (USE_GS_G2)
{
ECP2[] Q = new ECP2[4];
FP2 f = new FP2(new BIG(ROM.Fra), new BIG(ROM.Frb));
if (ECP.SEXTIC_TWIST == ECP.M_TYPE)
{
f.Inverse();
f.Norm();
}
BIG q = new BIG(ROM.CURVE_Order);
BIG[] u = GS(e);
BIG t = new BIG(0);
int i, np, nn;
//P.affine();
Q[0] = new ECP2();
Q[0].Copy(P);
for (i = 1; i < 4; i++)
{
Q[i] = new ECP2();
Q[i].Copy(Q[i - 1]);
Q[i].Frob(f);
}
for (i = 0; i < 4; i++)
{
np = u[i].NBits();
t.Copy(BIG.ModNeg(u[i], q));
nn = t.NBits();
if (nn < np)
{
u[i].Copy(t);
Q[i].Neg();
}
u[i].Norm();
//Q[i].affine();
}
R = ECP2.Mul4(Q, u);
}
else
{
R = P.Mul(e);
}
return(R);
}