Function curve25519_dalek::curve::double_scalar_mult_vartime

pub fn double_scalar_mult_vartime(a: &Scalar,
                                  A: &ExtendedPoint,
                                  b: &Scalar)
                                  -> ProjectivePoint

Given a point A and scalars a and b, compute the point aA+bB, where B is the Ed25519 basepoint (i.e., B = (x,4/5) with x positive).

Warning

This function is not constant time, hence its name.