functions are implemented in p256_asm_*.s // Montgomery multiplication. Sets res = in1 * in2 * R⁻¹ mod p. // //go:noescape func p256Mul(res, in1, in2 *p256Element) // Montgomery square, repeated n times (n >= 1). // //go:noescape func p256Sqr(res, in *p256Element, n int) // Montgomery multiplication by R⁻¹, or 1 outside the domain. // Sets res = in * R⁻¹, bringing res out of the Montgomery domain. // //go:noescape func p256FromMont(res, in *p256Element) // If cond is not 0, sets val = -val mod p. // //go:noescape...