// s = -1 * x + 0 mod l
	fiatScalarOpp(&s.s, &x.s)
	return s
}

// Multiply sets s = x * y mod l, and returns s.
func (s *Scalar) Multiply(x, y *Scalar) *Scalar {
	// s = x * y + 0 mod l
	fiatScalarMul(&s.s, &x.s, &y.s)
	return s
}

// Set sets s = x, and returns s.
func (s *Scalar) Set(x *Scalar) *Scalar {
	*s = *x
	return s
}