protected override ECPoint MultiplyPositive(ECPoint p, BigInteger k) { ECCurve curveOrig = p.Curve; ECCurve curveAdd = ConfigureCurve(curveOrig, additionCoord); ECCurve curveDouble = ConfigureCurve(curveOrig, doublingCoord); int[] naf = WNafUtilities.GenerateCompactNaf(k); ECPoint Ra = curveAdd.Infinity; ECPoint Td = curveDouble.ImportPoint(p); int zeroes = 0; for (int i = 0; i < naf.Length; ++i) { int ni = naf[i]; int digit = ni >> 16; zeroes += ni & 0xFFFF; Td = Td.TimesPow2(zeroes); ECPoint Tj = curveAdd.ImportPoint(Td); if (digit < 0) { Tj = Tj.Negate(); } Ra = Ra.Add(Tj); zeroes = 1; } return(curveOrig.ImportPoint(Ra)); }