checking whether there is a nonzero // coefficient to look up a multiple of. for ; i >= 0; i-- { tmp1.Double(tmp2) // Only update v if we have a nonzero coeff to add in. if aNaf[i] > 0 { v.fromP1xP1(tmp1) aTable.SelectInto(multA, aNaf[i]) tmp1.Add(v, multA) } else if aNaf[i] < 0 { v.fromP1xP1(tmp1) aTable.SelectInto(multA, -aNaf[i]) tmp1.Sub(v, multA) } if bNaf[i] > 0 { v.fromP1xP1(tmp1) basepointNafTable.SelectInto(multB, bNaf[i]) tmp1.AddAffine(v, multB) } else if bNaf[i] < 0 { v.fromP1xP1(tmp1)...