Function curve25519_dalek::curve::vartime::double_scalar_mult_basepoint

pub fn double_scalar_mult_basepoint(
    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).