stored // at an index offset of -1 so [8]P is at index 7, P is at 0, and [16]P is at 15. // [0]P is the point at infinity and it's not stored. type p256Table [16]P256Point // p256Select sets res to the point at index idx in the table. // idx must be in [0, 15]. It executes in constant time. // //go:noescape func p256Select(res *P256Point, table *p256Table, idx int) // p256AffinePoint is a point in affine coordinates (x, y). x and y are still // Montgomery domain elements. The point can't be the point...