internal FPoint AddS(FPoint b)
{
if (this.IsInfinity)
{
return(b);
}
if (b.IsInfinity)
{
return(this);
}
FieldElement x2 = (FieldElement)b.X;
FieldElement y2 = (FieldElement)b.Y;
if (this.x.Equals(x2))
{
if (this.y.Equals(y2))
{
return((FPoint)this.Twice());
}
return((FPoint)this.curve.Infinity);
}
ECFieldElement xSum = this.x.Add(x2);
FieldElement lambda = (FieldElement)(this.y.Add(y2)).Divide(xSum);
FieldElement x3 = (FieldElement)lambda.Square().Add(lambda).Add(xSum).Add(this.curve.A);
FieldElement y3 = (FieldElement)lambda.Multiply(this.x.Add(x3)).Add(x3).Add(this.y);
return(new FPoint(curve, x3, y3));
}
static FieldElement halfTrace(FieldElement x)
{
int m = 163;
FieldElement t = x;
for (int i = 1; i <= ((m - 1) / 2); i++)
{
t = (FieldElement)t.Square().Square().Add(x);
}
return(t);
}
static FieldElement trace(FieldElement x)
{
int m = 163;
FieldElement t = x;
for (int i = 1; i < m; i++)
{
t = (FieldElement)t.Square().Add(x);
}
return(t);
}
