ec_edwards_crv_init
ATTRIBUTE_WARN_UNUSED_RET int ec_edwards_crv_init(ec_edwards_crv_t crv, fp_src_t a, fp_src_t b, nn_src_t order);
ret = ec_edwards_crv_init(e_crv, &d, &a, &(m_crv->order));
ret = ec_edwards_crv_init(e_crv, &a, &d, &(m_crv->order));
ret = ec_edwards_crv_init(&edwards_curve_edwards448, &(edwards_curve->a), &tmp, &(edwards_curve->order)); EG(ret, err);