e)(out[1:33]), x) return out[:] } // Select sets q to p1 if cond == 1, and to p2 if cond == 0. func (q *P256Point) Select(p1, p2 *P256Point, cond int) *P256Point { p256MovCond(q, p1, p2, cond) return q } // p256Inverse sets out to in⁻¹ mod p. If in is zero, out will be zero. func p256Inverse(out, in *p256Element) { // Inversion is calculated through exponentiation by p - 2, per Fermat's // little theorem. // // The sequence of 12 multiplications and 255 squarings is derived from the // following...