Function expected_Q

tests/unit/c_api/test_pve_batch.cpp:17–27

using coinbase::mem_t;

static buf_t expected_Q(cbmpc_curve_id_t curve_id, mem_t x) {
  const coinbase::crypto::ecurve_t curve = (curve_id == CBMPC_CURVE_P256)        ? coinbase::crypto::curve_p256
                                           : (curve_id == CBMPC_CURVE_SECP256K1) ? coinbase::crypto::curve_secp256k1
                                           : (curve_id == CBMPC_CURVE_ED25519)   ? coinbase::crypto::curve_ed25519
                                                                                 : coinbase::crypto::ecurve_t();
  cb_assert(curve.valid());

  const coinbase::crypto::bn_t bn_x = coinbase::crypto::bn_t::from_bin(x) % curve.order();
  const coinbase::crypto::ecc_point_t Q = bn_x * curve.generator();
  return Q.to_compressed_bin();
}

static void expect_eq(cmem_t a, cmem_t b) {
  ASSERT_EQ(a.size, b.size);