public Projective EcMult(BigInt d, Projective s)
{
var size = s.x.Length;
if (d.IsZero() || s.z.IsZero())
{
return new Projective() { x = new BigInt(1, size), y = new BigInt(1, size), z = new BigInt(0, size) };
}
if (d.IsOne())
{
return s.Clone();
}
if (!s.z.IsOne())
{
var affine = EcAffinify(s);
s = EcProjectify(affine);
affine.Clear();
}
else
{
s = s.Clone();
}
var r = s.Clone();
var h = d.Mul3();
for (var i = h.BitCount() - 2; i >= 1; i--)
{
var rTmp = r;
r = EcDouble(r);
rTmp.Clear();
if (h.BitAt(i) && !d.BitAt(i))
{
var u = EcFullAdd(r, s);
r.Clear();
r = u;
}
else if (!h.BitAt(i) && d.BitAt(i))
{
var u = EcFullSub(r, s);
r.Clear();
r = u;
}
}
h.Clear();
return r;
}
