&t1.x, &t2.x) return e } // Mul sets e = t1 * t2, and returns e. func (e *P521Element) Mul(t1, t2 *P521Element) *P521Element { p521Mul(&e.x, &t1.x, &t2.x) return e } // Square sets e = t * t, and returns e. func (e *P521Element) Square(t *P521Element) *P521Element { p521Square(&e.x, &t.x) return e } // Select sets v to a if cond == 1, and to b if cond == 0. func (v *P521Element) Select(a, b *P521Element, cond int) *P521Element { p521Selectznz((*p521UntypedFieldElem)(&v.x), p521Uint1(cond), (*p521U...