affine coordinates (x, y). x and y are still // Montgomery domain elements. The point can't be the point at infinity. type p256AffinePoint struct { x, y fiat.P256Element } func (p *p256AffinePoint) Projective() *P256Point { pp := &P256Point{x: p.x, y: p.y} pp.z.One() return pp } // AddAffine sets q = p1 + p2, if infinity == 0, and to p1 if infinity == 1. // p2 can't be the point at infinity as it can't be represented in affine // coordinates, instead callers can set p2 to an arbitrary point and set...