multilinear_batching_verifier.hpp

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// === AUDIT STATUS ===
// internal:    { status: not started, auditors: [], date: YYYY-MM-DD }
// external_1:  { status: not started, auditors: [], date: YYYY-MM-DD }
// external_2:  { status: not started, auditors: [], date: YYYY-MM-DD }
// =====================
 
#pragma once
#include "barretenberg/flavor/mega_recursive_flavor.hpp"
#include "barretenberg/flavor/multilinear_batching_flavor.hpp"
#include "barretenberg/flavor/multilinear_batching_recursive_flavor.hpp"
#include "barretenberg/honk/proof_system/types/proof.hpp"
#include "barretenberg/multilinear_batching/multilinear_batching_claims.hpp"
#include "barretenberg/relations/relation_parameters.hpp"
#include "barretenberg/stdlib/primitives/circuit_builders/circuit_builders_fwd.hpp"
#include "barretenberg/sumcheck/sumcheck.hpp"
#include "barretenberg/sumcheck/sumcheck_output.hpp"
 
#include <vector>
 
namespace bb {
 
template <typename Flavor_> class MultilinearBatchingVerifier {
  public:
    using Flavor = Flavor_;
    using FF = typename Flavor::FF;
    using Curve = typename Flavor::Curve;
    using Transcript = typename Flavor::Transcript;
 
    using Commitment = typename Flavor::Commitment;
    using Sumcheck = SumcheckVerifier<Flavor>;
    using VerifierClaim = MultilinearBatchingVerifierClaim<Curve>;
    using Proof = std::vector<FF>;
 
    using InstanceFlavor = std::conditional_t<std::is_same_v<Flavor, MultilinearBatchingFlavor>,
                                              MegaFlavor,
                                              MegaRecursiveFlavor_<MegaCircuitBuilder>>;
    using InstanceCommitments = InstanceFlavor::VerifierCommitments;
    using InstanceFF = InstanceFlavor::FF;
    static constexpr size_t NUM_UNSHIFTED_ENTITIES = MegaFlavor::NUM_UNSHIFTED_ENTITIES;
    static constexpr size_t NUM_SHIFTED_ENTITIES = MegaFlavor::NUM_SHIFTED_ENTITIES;
 
    explicit MultilinearBatchingVerifier(const std::shared_ptr<Transcript>& transcript);
 
    std::pair<bool, VerifierClaim> verify_proof(SumcheckOutput<InstanceFlavor>& instance_sumcheck,
                                                InstanceCommitments& verifier_commitments,
                                                std::vector<InstanceFF>& unshifted_challenges,
                                                std::vector<InstanceFF>& shifted_challenges);
 
  private:
    std::shared_ptr<Transcript> transcript;
    std::shared_ptr<VerifierClaim> accumulator_claim;
    std::shared_ptr<VerifierClaim> instance_claim;
 
    FF compute_new_target_sum(const FF& alpha,
                              SumcheckOutput<InstanceFlavor>& instance_sumcheck,
                              const std::vector<InstanceFF>& unshifted_challenges,
                              const std::vector<InstanceFF>& shifted_challenges,
                              const FF& accumulator_non_shifted_evaluation,
                              const FF& accumulator_shifted_evaluation) const;
 
    template <size_t N>
    Commitment batch_mul(RefArray<Commitment, N> instance_commitments,
                         const Commitment& accumulator_commitment,
                         std::vector<FF>& scalars,
                         const FF& batching_challenge);
 
    VerifierClaim compute_new_claim(const SumcheckOutput<Flavor>& sumcheck_result,
                                    InstanceCommitments& verifier_commitments,
                                    std::vector<InstanceFF>& unshifted_challenges,
                                    std::vector<InstanceFF>& shifted_challenges,
                                    const Commitment& non_shifted_accumulator_commitment,
                                    const Commitment& shifted_accumulator_commitment,
                                    const FF& batching_challenge);
};
 
} // namespace bb