zk/include/nil/crypto3/zk/snark/systems/ppzksnark/tbcs_ppzksnark/verifier.hpp

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//---------------------------------------------------------------------------//
// Copyright (c) 2018-2021 Mikhail Komarov <nemo@nil.foundation>
// Copyright (c) 2020-2021 Nikita Kaskov <nbering@nil.foundation>
//
// MIT License
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#ifndef CRYPTO3_ZK_TBCS_PPZKSNARK_BASIC_VERIFIER_HPP
#define CRYPTO3_ZK_TBCS_PPZKSNARK_BASIC_VERIFIER_HPP
 
#include <nil/crypto3/zk/snark/relations/circuit_satisfaction_problems/tbcs.hpp>
#include <nil/crypto3/zk/snark/reductions/tbcs_to_uscs.hpp>
#include <nil/crypto3/zk/snark/schemes/ppzksnark/uscs_ppzksnark.hpp>
#include <nil/crypto3/zk/snark/schemes/ppzksnark/tbcs_ppzksnark/detail/basic_policy.hpp>
#include <nil/crypto3/zk/snark/algorithms/verify.hpp>
 
namespace nil {
    namespace crypto3 {
        namespace zk {
            namespace snark {
 
                /*
                 Below are four variants of verifier algorithm for the TBCS ppzkSNARK.
 
                 These are the four cases that arise from the following two choices:
 
                 (1) The verifier accepts a (non-processed) verification key or, instead, a processed
                 verification key. In the latter case, we call the algorithm an "online verifier".
 
                 (2) The verifier checks for "weak" input consistency or, instead, "strong" input consistency.
                     Strong input consistency requires that |primary_input| = C.num_inputs, whereas
                     weak input consistency requires that |primary_input| <= C.num_inputs (and
                     the primary input is implicitly padded with zeros up to length C.num_inputs).
                 */
 
                template<typename CurveType>
                class tbcs_ppzksnark_process_verification_key {
                    typedef detail::tbcs_ppzksnark_policy<CurveType> policy_type;
 
                public:
                    typedef typename policy_type::verification_key_type verification_key_type;
                    typedef typename policy_type::processed_verification_key_type processed_verification_key_type;
 
                    static inline processed_verification_key_type process(const verification_key_type &vk) {
                        return uscs_ppzksnark_process_verification_key<CurveType>::process(vk);
                    }
                };
 
                template<typename CurveType>
                class tbcs_ppzksnark_verifier_weak_input_consistency {
                    typedef detail::tbcs_ppzksnark_policy<CurveType> policy_type;
 
                    using uscs_ppzksnark_weak_proof_system = uscs_ppzksnark<CurveType,
                                          uscs_ppzksnark_generator<CurveType>,
                                          uscs_ppzksnark_prover<CurveType>,
                                          uscs_ppzksnark_verifier_weak_input_consistency<CurveType>>;
 
                public:
                    typedef typename policy_type::primary_input_type primary_input_type;
                    typedef typename policy_type::verification_key_type verification_key_type;
                    typedef typename policy_type::processed_verification_key_type processed_verification_key_type;
                    typedef typename policy_type::proof_type proof_type;
 
                    static inline bool process(const verification_key_type &vk,
                                               const primary_input_type &primary_input,
                                               const proof_type &proof) {
                        typedef typename CurveType::scalar_field_type field_type;
                        const uscs_primary_input<field_type> uscs_input =
                            algebra::convert_bit_vector_to_field_element_vector<field_type>(primary_input);
                        return verify<uscs_ppzksnark_weak_proof_system>(
                            tbcs_ppzksnark_process_verification_key<CurveType>::process(vk), uscs_input, proof);
                    }
 
                    static inline bool process(const processed_verification_key_type &pvk,
                                               const primary_input_type &primary_input,
                                               const proof_type &proof) {
 
                        typedef typename CurveType::scalar_field_type field_type;
                        const uscs_primary_input<field_type> uscs_input =
                            algebra::convert_bit_vector_to_field_element_vector<field_type>(primary_input);
 
                        return verify<uscs_ppzksnark_weak_proof_system>(pvk, uscs_input, proof);
                    }
                };
 
                template<typename CurveType>
                class tbcs_ppzksnark_verifier_strong_input_consistency {
                    typedef detail::tbcs_ppzksnark_policy<CurveType> policy_type;
 
                    using uscs_ppzksnark_proof_system = uscs_ppzksnark<CurveType>;
                public:
                    typedef typename policy_type::primary_input_type primary_input_type;
                    typedef typename policy_type::verification_key_type verification_key_type;
                    typedef typename policy_type::processed_verification_key_type processed_verification_key_type;
                    typedef typename policy_type::proof_type proof_type;
 
                    static inline bool process(const verification_key_type &vk,
                                               const primary_input_type &primary_input,
                                               const proof_type &proof) {
                        typedef typename CurveType::scalar_field_type field_type;
                        const uscs_primary_input<field_type> uscs_input =
                            algebra::convert_bit_vector_to_field_element_vector<field_type>(primary_input);
 
                        return verify<uscs_ppzksnark_proof_system>(
                            tbcs_ppzksnark_process_verification_key<CurveType>::process(vk), uscs_input, proof);
                    }
 
                    static inline bool process(const processed_verification_key_type &pvk,
                                               const primary_input_type &primary_input,
                                               const proof_type &proof) {
                        typedef typename CurveType::scalar_field_type field_type;
                        const uscs_primary_input<field_type> uscs_input =
                            algebra::convert_bit_vector_to_field_element_vector<field_type>(primary_input);
 
                        return verify<uscs_ppzksnark_proof_system>(pvk, uscs_input, proof);
                    }
                };
            }    // namespace snark
        }        // namespace zk
    }            // namespace crypto3
}    // namespace nil
 
#endif    // CRYPTO3_ZK_TBCS_PPZKSNARK_BASIC_VERIFIER_HPP