public static ECPoint SumOfTwoMultiplies(ECPoint P, BigInteger a, ECPoint Q, BigInteger b)
{
ECCurve curve = P.Curve;
Q = ECAlgorithms.ImportPoint(curve, Q);
if (curve is F2mCurve)
{
F2mCurve f2mCurve = (F2mCurve)curve;
if (f2mCurve.IsKoblitz)
{
return(ECAlgorithms.ValidatePoint(P.Multiply(a).Add(Q.Multiply(b))));
}
}
GlvEndomorphism glvEndomorphism = curve.GetEndomorphism() as GlvEndomorphism;
if (glvEndomorphism != null)
{
return(ECAlgorithms.ValidatePoint(ECAlgorithms.ImplSumOfMultipliesGlv(new ECPoint[]
{
P,
Q
}, new BigInteger[]
{
a,
b
}, glvEndomorphism)));
}
return(ECAlgorithms.ValidatePoint(ECAlgorithms.ImplShamirsTrickWNaf(P, a, Q, b)));
}
public static ECPoint ShamirsTrick(ECPoint P, BigInteger k, ECPoint Q, BigInteger l)
{
ECCurve curve = P.Curve;
Q = ECAlgorithms.ImportPoint(curve, Q);
return(ECAlgorithms.ValidatePoint(ECAlgorithms.ImplShamirsTrickJsf(P, k, Q, l)));
}
public static ECPoint SumOfMultiplies(ECPoint[] ps, BigInteger[] ks)
{
if (ps == null || ks == null || ps.Length != ks.Length || ps.Length < 1)
{
throw new ArgumentException("point and scalar arrays should be non-null, and of equal, non-zero, length");
}
int num = ps.Length;
switch (num)
{
case 1:
return(ps[0].Multiply(ks[0]));
case 2:
return(ECAlgorithms.SumOfTwoMultiplies(ps[0], ks[0], ps[1], ks[1]));
default:
{
ECPoint eCPoint = ps[0];
ECCurve curve = eCPoint.Curve;
ECPoint[] array = new ECPoint[num];
array[0] = eCPoint;
for (int i = 1; i < num; i++)
{
array[i] = ECAlgorithms.ImportPoint(curve, ps[i]);
}
GlvEndomorphism glvEndomorphism = curve.GetEndomorphism() as GlvEndomorphism;
if (glvEndomorphism != null)
{
return(ECAlgorithms.ValidatePoint(ECAlgorithms.ImplSumOfMultipliesGlv(array, ks, glvEndomorphism)));
}
return(ECAlgorithms.ValidatePoint(ECAlgorithms.ImplSumOfMultiplies(array, ks)));
}
}
}
