Language: Go
Label: safe
CWE: CWE-682 \u2014 Incorrect Calculation
The product performs a calculation that generates incorrect or unintended results that are later used in security-critical decisions or resource management.

Code:
func (r *P256Point) ScalarMult(q *P256Point, scalar []byte) (*P256Point, error) {
	if len(scalar) != 32 {
		return nil, errors.New("invalid scalar length")
	}
	scalarReversed := new(p256OrdElement)
	p256OrdBigToLittle(scalarReversed, (*[32]byte)(scalar))
	p256OrdReduce(scalarReversed)

	r.Set(q).p256ScalarMult(scalarReversed)
	return r, nil
}