ecc_mod_pow_2k_mul (const struct ecc_modulo *m,
		    mp_limb_t *rp, const mp_limb_t *xp,
		    unsigned k, const mp_limb_t *yp,
		    mp_limb_t *tp)
{
  ecc_mod_pow_2k (m, rp, xp, k, tp);
  ecc_mod_mul (m, rp, rp, yp, tp);
}
ecc_mod_pow_2k_mul (const struct ecc_modulo *m,
		    mp_limb_t *rp, const mp_limb_t *xp,
		    unsigned k, const mp_limb_t *yp,
		    mp_limb_t *tp)
{
  ecc_mod_pow_2k (m, rp, xp, k, tp);
  ecc_mod_mul (m, rp, rp, yp, tp);
}