public virtual bool Equals(ECPoint other)
{
if (this == other)
{
return(true);
}
if (null == other)
{
return(false);
}
ECCurve c1 = this.Curve, c2 = other.Curve;
bool n1 = (null == c1), n2 = (null == c2);
bool i1 = IsInfinity, i2 = other.IsInfinity;
if (i1 || i2)
{
return((i1 && i2) && (n1 || n2 || c1.Equals(c2)));
}
ECPoint p1 = this, p2 = other;
if (n1 && n2)
{
// Points with null curve are in affine form, so already normalized
}
else if (n1)
{
p2 = p2.Normalize();
}
else if (n2)
{
p1 = p1.Normalize();
}
else if (!c1.Equals(c2))
{
return(false);
}
else
{
// TODO Consider just requiring already normalized, to avoid silent performance degradation
ECPoint[] points = new ECPoint[] { this, c1.ImportPoint(p2) };
// TODO This is a little strong, really only requires coZNormalizeAll to get Zs equal
c1.NormalizeAll(points);
p1 = points[0];
p2 = points[1];
}
return(p1.XCoord.Equals(p2.XCoord) && p1.YCoord.Equals(p2.YCoord));
}
protected bool Equals(
ECDomainParameters other)
{
return curve.Equals(other.curve)
&& g.Equals(other.g)
&& n.Equals(other.n)
&& h.Equals(other.h)
&& true; // TODO: FIXME Arrays.AreEqual(seed, other.seed);
}
public static ECPoint ImportPoint(ECCurve c, ECPoint p)
{
ECCurve cp = p.Curve;
if (!c.Equals(cp))
{
throw new ArgumentException("Point must be on the same curve");
}
return(c.ImportPoint(p));
}
public static ECPoint SumOfTwoMultiplies(ECPoint P, BigInteger a,
ECPoint Q, BigInteger b)
{
ECCurve c = P.Curve;
if (!c.Equals(Q.Curve))
{
throw new ArgumentException("P and Q must be on same curve");
}
/*
* // Point multiplication for Koblitz curves (using WTNAF) beats Shamir's trick
* if (c is F2mCurve)
* {
* F2mCurve f2mCurve = (F2mCurve) c;
* if (f2mCurve.IsKoblitz)
* {
* return P.Multiply(a).Add(Q.Multiply(b));
* }
* }
*/
return(ImplShamirsTrick(P, a, Q, b));
}