hypernova_decider_verifier.cpp

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// === AUDIT STATUS ===
// internal:    { status: Complete, auditors: [Sergei], commit: }
// external_1:  { status: not started, auditors: [], commit: }
// external_2:  { status: not started, auditors: [], commit: }
// =====================
 
#include "barretenberg/hypernova/hypernova_decider_verifier.hpp"
#include "barretenberg/commitment_schemes/claim_batcher.hpp"
#include "barretenberg/commitment_schemes/shplonk/shplemini.hpp"
 
namespace bb {
 
template <typename Flavor>
HypernovaDeciderVerifier<Flavor>::PairingPoints HypernovaDeciderVerifier<Flavor>::verify_proof(
    Accumulator& accumulator, const HypernovaDeciderVerifier::Proof& proof)
{
    using ShpleminiVerifier = bb::ShpleminiVerifier_<Curve, Flavor::HasZK>;
    using ClaimBatcher = ClaimBatcher_<Curve>;
    using ClaimBatch = ClaimBatcher::Batch;
 
    vinfo("HypernovaDeciderVerifier: verifying PCS proof...");
    transcript->load_proof(proof);
 
    // Construct generator based on whether we are in-circuit or not
    Commitment generator;
    if constexpr (IsRecursiveFlavor<Flavor>) {
        generator = Commitment::one(accumulator.non_shifted_commitment.get_context());
    } else {
        generator = Commitment::one();
    }
 
    // Execute Shplemini verifier
    ClaimBatcher claim_batcher{ .unshifted = ClaimBatch{ RefVector(accumulator.non_shifted_commitment),
                                                         RefVector(accumulator.non_shifted_evaluation) },
                                .shifted = ClaimBatch{ RefVector(accumulator.shifted_commitment),
                                                       RefVector(accumulator.shifted_evaluation) } };
    std::vector<FF> padding_indicator_array(Flavor::VIRTUAL_LOG_N, 1);
    auto opening_claim = ShpleminiVerifier::compute_batch_opening_claim(
                             padding_indicator_array, claim_batcher, accumulator.challenge, generator, transcript)
                             .batch_opening_claim;
 
    if constexpr (IsRecursiveFlavor<Flavor>) {
        PairingPoints pairing_points(PCS::reduce_verify_batch_opening_claim(std::move(opening_claim), transcript));
        return pairing_points;
    } else {
        auto pairing_points = PCS::reduce_verify_batch_opening_claim(std::move(opening_claim), transcript);
        // Native pairing points contain affine elements
        return { typename Curve::AffineElement(pairing_points[0]), typename Curve::AffineElement(pairing_points[1]) };
    }
};
 
template class HypernovaDeciderVerifier<MegaFlavor>;
template class HypernovaDeciderVerifier<MegaRecursiveFlavor_<MegaCircuitBuilder>>;
}; // namespace bb