ec_GFp_nistp224_mod
MP_CHECKOK(ec_GFp_nistp224_mod(r, r, meth));
MP_CHECKOK(ec_GFp_nistp224_mod(r, r, meth));
MP_CHECKOK(ec_GFp_nistp224_mod(r, r, meth));
group->meth->field_mod = &ec_GFp_nistp224_mod;