private List <PointECC> compute()
{
List <PointECC> RPs = new List <PointECC>();
PointECC R = new PointECC();
R.x = Gx;
R.y = Gy;
lsb_points.Items.Add(" G = (" + R.x.ToString() + ", " + R.y.ToString() + ")");
RPs.Add(R);
R = PointDouble(R.x, R.y);
lsb_points.Items.Add("2G = (" + R.x.ToString() + ", " + R.y.ToString() + ")");
RPs.Add(R);
for (int i = 3; ; i++)
{
R = P_add_Q(R.x, R.y, Gx, Gy);
//R.x = int.PositiveInfinity;
if (signal)
{
signal = false;
lsb_points.Items.Add(i.ToString() + "G = Infinity");
return(RPs);
}
lsb_points.Items.Add(i.ToString() + "G = (" + R.x.ToString() + ", " + R.y.ToString() + ")");
RPs.Add(R);
}
}
private PointECC PointDouble(int x, int y)
{
int s = 0, s_tu = 0, s_mau = 1;
PointECC RP = new PointECC();
s_tu = 3 * x * x + factorA;
if (s_tu > module)
{
s_tu %= module;
}
s_mau = 2 * y;
if (s_mau == 0)
{
signal = true;
return(RP);
}
if (Math.Abs(s_mau) != 1)
{
if (s_mau < 0)
{
s_mau = -module_denominator(Math.Abs(s_mau), module);
}
else
{
s_mau = module_denominator(Math.Abs(s_mau), module);
}
}
s = (s_tu * s_mau);
if (s > module)
{
s %= module;
}
RP.x = (s * s - 2 * x) % module;
if (RP.x < 0)
{
RP.x = module + RP.x;
}
RP.y = (s * (x - RP.x) - y) % module;
if (RP.y < 0)
{
RP.y = module + RP.y;
}
return(RP);
}
private PointECC P_add_Q(int xp, int yp, int xq, int yq)
{
int s = 0, s_tu = 0, s_mau = 1;
PointECC RP = new PointECC();
s_tu = yp - yq;
if (s_tu > module)
{
s_tu = s_tu % module;
}
s_mau = xp - xq;
if (s_mau == 0)
{
signal = true;
return(RP);
}
if (Math.Abs(s_mau) != 1)
{
if (s_mau < 0)
{
s_mau = -module_denominator(Math.Abs(s_mau), module);
}
else
{
s_mau = module_denominator(Math.Abs(s_mau), module);
}
}
s = (s_tu * s_mau);
RP.x = (s * s - (xp + xq)) % module;
if (RP.x < 0)
{
RP.x = module + RP.x;
}
RP.y = (s * (xp - RP.x) - yp) % module;
if (RP.y < 0)
{
RP.y = module + RP.y;
}
return(RP);
}
