zk/include/nil/crypto3/zk/snark/systems/ppzksnark/bacs_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_BACS_PPZKSNARK_BASIC_VERIFIER_HPP
#define CRYPTO3_ZK_BACS_PPZKSNARK_BASIC_VERIFIER_HPP
 
#include <nil/crypto3/zk/snark/relations/circuit_satisfaction_problems/bacs.hpp>
#include <nil/crypto3/zk/snark/schemes/ppzksnark/bacs_ppzksnark/detail/basic_policy.hpp>
 
#include <nil/crypto3/zk/snark/schemes/ppzksnark/r1cs_ppzksnark.hpp>
 
#include <nil/crypto3/zk/snark/algorithms/verify.hpp>
 
namespace nil {
    namespace crypto3 {
        namespace zk {
            namespace snark {
 
                template<typename CurveType>
                class bacs_ppzksnark_process_verification_key {
                    typedef detail::bacs_ppzksnark_policy<CurveType> policy_type;
 
                public:
                    typedef typename policy_type::circuit_type circuit_type;
                    typedef typename policy_type::primary_input_type primary_input_type;
                    typedef typename policy_type::auxiliary_input_type auxiliary_input_type;
 
                    typedef typename policy_type::proving_key_type proving_key_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::keypair_type keypair_type;
                    typedef typename policy_type::proof_type proof_type;
 
                    static inline processed_verification_key_type
                        process(const verification_key_type &verification_key) {
                        return r1cs_ppzksnark_process_verification_key<CurveType>::process(verification_key);
                    }
                };
 
                /*
                 Below are four variants of verifier algorithm for the BACS 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 bacs_ppzksnark_verifier_weak_input_consistency {
                    typedef detail::bacs_ppzksnark_policy<CurveType> policy_type;
 
                    using r1cs_ppzksnark_weak_proof_system =
                        r1cs_ppzksnark<CurveType,
                                       r1cs_ppzksnark_generator<CurveType>,
                                       r1cs_ppzksnark_prover<CurveType>,
                                       r1cs_ppzksnark_verifier_weak_input_consistency<CurveType>>;
 
                public:
                    typedef typename policy_type::circuit_type circuit_type;
                    typedef typename policy_type::primary_input_type primary_input_type;
                    typedef typename policy_type::auxiliary_input_type auxiliary_input_type;
 
                    typedef typename policy_type::proving_key_type proving_key_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::keypair_type keypair_type;
                    typedef typename policy_type::proof_type proof_type;
 
                    static inline bool process(const verification_key_type &verification_key,
                                               const primary_input_type &primary_input,
                                               const proof_type &proof) {
                        return verify<r1cs_ppzksnark_weak_proof_system>(
                            bacs_ppzksnark_process_verification_key<CurveType>::process(verification_key),
                            primary_input,
                            proof);
                    }
 
                    static inline bool process(const processed_verification_key_type &processed_verification_key,
                                               const primary_input_type &primary_input,
                                               const proof_type &proof) {
                        return verify<r1cs_ppzksnark_weak_proof_system>(
                            processed_verification_key, primary_input, proof);
                    }
                };
 
                template<typename CurveType>
                class bacs_ppzksnark_verifier_strong_input_consistency {
                    typedef detail::bacs_ppzksnark_policy<CurveType> policy_type;
 
                    using r1cs_ppzksnark_proof_system = r1cs_ppzksnark<CurveType>;
 
                public:
                    typedef typename policy_type::circuit_type circuit_type;
                    typedef typename policy_type::primary_input_type primary_input_type;
                    typedef typename policy_type::auxiliary_input_type auxiliary_input_type;
 
                    typedef typename policy_type::proving_key_type proving_key_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::keypair_type keypair_type;
                    typedef typename policy_type::proof_type proof_type;
 
                    static inline bool process(const verification_key_type &verification_key,
                                               const primary_input_type &primary_input,
                                               const proof_type &proof) {
                        return verify<r1cs_ppzksnark_proof_system>(
                            bacs_ppzksnark_process_verification_key<CurveType>::process(verification_key),
                            primary_input,
                            proof);
                    }
 
                    static inline bool process(const processed_verification_key_type &processed_verification_key,
                                               const primary_input_type &primary_input,
                                               const proof_type &proof) {
                        return verify<r1cs_ppzksnark_proof_system>(processed_verification_key, primary_input, proof);
                    }
                };
            }    // namespace snark
        }        // namespace zk
    }            // namespace crypto3
}    // namespace nil
 
#endif    // CRYPTO3_ZK_BACS_PPZKSNARK_BASIC_VERIFIER_HPP