minor updates kzg commitment #113

Author: tshchelovek

include/nil/crypto3/zk/commitments/polynomial/kzg.hpp

@@ -121,16 +121,13 @@ namespace nil {
                                             scalar_value_type i,
                                             scalar_value_type eval,
                                             proof_type p) {
-                        
-                        using g1_precomp_type = typename pairing_policy::g1_precomputed_type;
-                        using g2_precomp_type = typename pairing_policy::g2_precomputed_type;
 
-                        g1_precomp_type A_1 = algebra::precompute_g1<curve_type>(p);
-                        g2_precomp_type A_2 = algebra::precompute_g2<curve_type>(srs.verification_key -
+                        auto A_1 = algebra::precompute_g1<curve_type>(p);
+                        auto A_2 = algebra::precompute_g2<curve_type>(srs.verification_key -
                                                                         i * curve_type::template g2_type<>::value_type::one());
-                        g1_precomp_type B_1 = algebra::precompute_g1<curve_type>(eval * curve_type::template g1_type<>::value_type::one() -
+                        auto B_1 = algebra::precompute_g1<curve_type>(eval * curve_type::template g1_type<>::value_type::one() -
                                                                         C_f);
-                        g2_precomp_type B_2 = algebra::precompute_g2<curve_type>(curve_type::template g2_type<>::value_type::one());
+                        auto B_2 = algebra::precompute_g2<curve_type>(curve_type::template g2_type<>::value_type::one());
 
                         gt_value_type gt3 = algebra::double_miller_loop<curve_type>(A_1, A_2, B_1, B_2);
                         gt_value_type gt_4 = algebra::final_exponentiation<curve_type>(gt3);

test/commitment/kzg.cpp

@@ -79,4 +79,26 @@ BOOST_AUTO_TEST_CASE(kzg_basic_test) {
     BOOST_CHECK(kzg_type::verify_eval(srs, commit, i, eval, proof));
 }
 
+BOOST_AUTO_TEST_CASE(kzg_random_test) {
+
+    typedef algebra::curves::mnt4<298> curve_type;
+    typedef typename curve_type::base_field_type::value_type base_value_type;
+    typedef typename curve_type::base_field_type base_field_type;
+    typedef typename curve_type::scalar_field_type scalar_field_type;
+    typedef typename curve_type::scalar_field_type::value_type scalar_value_type;
+    typedef zk::commitments::kzg_commitment<curve_type> kzg_type;
+
+    scalar_value_type alpha = algebra::random_element<scalar_field_type>();
+    scalar_value_type i = algebra::random_element<scalar_field_type>();
+    std::size_t n = 298;
+    const polynomial<scalar_value_type> f = {-1, 1, 2, 3, 5, -15};
+
+    auto srs = kzg_type::setup({alpha, n});
+    auto commit = kzg_type::commit(srs, f);
+    auto eval = f.evaluate(i);
+    auto proof = kzg_type::proof_eval(srs, i, f);
+
+    BOOST_CHECK(kzg_type::verify_eval(srs, commit, i, eval, proof));
+}
+
 BOOST_AUTO_TEST_SUITE_END()