mock_circuits.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/commitment_schemes/commitment_key.hpp"
#include "barretenberg/common/op_count.hpp"
#include "barretenberg/crypto/ecdsa/ecdsa.hpp"
#include "barretenberg/crypto/merkle_tree/memory_store.hpp"
#include "barretenberg/crypto/merkle_tree/merkle_tree.hpp"
#include "barretenberg/flavor/mega_flavor.hpp"
#include "barretenberg/srs/global_crs.hpp"
#include "barretenberg/stdlib/encryption/ecdsa/ecdsa.hpp"
#include "barretenberg/stdlib/hash/keccak/keccak.hpp"
#include "barretenberg/stdlib/hash/sha256/sha256.hpp"
#include "barretenberg/stdlib/honk_verifier/ultra_recursive_verifier.hpp"
#include "barretenberg/stdlib/primitives/curves/secp256k1.hpp"
#include "barretenberg/stdlib/protogalaxy_verifier/protogalaxy_recursive_verifier.hpp"
#include "barretenberg/stdlib/special_public_inputs/special_public_inputs.hpp"
#include "barretenberg/stdlib_circuit_builders/mock_circuits.hpp"
 
namespace bb {
 
template <typename Builder> void generate_sha256_test_circuit(Builder& builder, size_t num_iterations)
{
    std::string in;
    in.resize(32);
    stdlib::byte_array<Builder> input(&builder, in);
    for (size_t i = 0; i < num_iterations; i++) {
        input = stdlib::SHA256<Builder>::hash(input);
    }
}
 
static constexpr TraceStructure SMALL_TEST_STRUCTURE_FOR_OVERFLOWS{ .ecc_op = 1 << 14,
                                                                    .busread = 1 << 14,
                                                                    .lookup = 1 << 14,
                                                                    .pub_inputs = 1 << 14,
                                                                    .arithmetic = 1 << 15,
                                                                    .delta_range = 1 << 14,
                                                                    .elliptic = 1 << 14,
                                                                    .memory = 1 << 14,
                                                                    .nnf = 1 << 7,
                                                                    .poseidon2_external = 1 << 14,
                                                                    .poseidon2_internal = 1 << 15,
                                                                    .overflow = 0 };
 
class GoblinMockCircuits {
  public:
    using Curve = curve::BN254;
    using FF = Curve::ScalarField;
    using Fbase = Curve::BaseField;
    using Point = Curve::AffineElement;
    using CommitmentKey = bb::CommitmentKey<Curve>;
    using OpQueue = bb::ECCOpQueue;
    using MegaBuilder = bb::MegaCircuitBuilder;
    using Flavor = bb::MegaFlavor;
    using RecursiveFlavor = bb::MegaRecursiveFlavor_<MegaBuilder>;
    using RecursiveVerifier = bb::stdlib::recursion::honk::UltraRecursiveVerifier_<RecursiveFlavor>;
    using DeciderVerificationKey = bb::DeciderVerificationKey_<Flavor>;
    using RecursiveDeciderVerificationKey =
        ::bb::stdlib::recursion::honk::RecursiveDeciderVerificationKey_<RecursiveFlavor>;
    using RecursiveVKAndHash = RecursiveDeciderVerificationKey::VKAndHash;
    using RecursiveVerifierAccumulator = std::shared_ptr<RecursiveDeciderVerificationKey>;
    using VerificationKey = Flavor::VerificationKey;
 
    static constexpr size_t NUM_WIRES = Flavor::NUM_WIRES;
 
    static void construct_mock_app_circuit(MegaBuilder& builder, bool large = false)
    {
        PROFILE_THIS();
 
        if (large) { // Results in circuit size 2^19
            generate_sha256_test_circuit<MegaBuilder>(builder, 9);
            stdlib::generate_ecdsa_verification_test_circuit(builder, 8);
        } else { // Results in circuit size 2^17
            generate_sha256_test_circuit<MegaBuilder>(builder, 8);
            stdlib::generate_ecdsa_verification_test_circuit(builder, 2);
        }
 
        // TODO(https://github.com/AztecProtocol/barretenberg/issues/911): We require goblin ops to be added to the
        // function circuit because we cannot support zero commtiments. While the builder handles this at
        // DeciderProvingKey creation stage via the add_gates_to_ensure_all_polys_are_non_zero function for other
        // MegaHonk circuits (where we don't explicitly need to add goblin ops), in IVC merge proving happens prior to
        // folding where the absense of goblin ecc ops will result in zero commitments.
        MockCircuits::construct_goblin_ecc_op_circuit(builder);
        bb::stdlib::recursion::honk::AppIO::add_default(builder);
    }
 
    static void add_some_ecc_op_gates(MegaBuilder& builder)
    {
        PROFILE_THIS();
 
        // Add some arbitrary ecc op gates
        for (size_t i = 0; i < 3; ++i) {
            auto point = Point::random_element(&engine);
            auto scalar = FF::random_element(&engine);
            builder.queue_ecc_add_accum(point);
            builder.queue_ecc_mul_accum(point, scalar);
        }
        // queues the result of the preceding ECC
        builder.queue_ecc_eq(); // should be eq and reset
    }
 
    static void randomise_op_queue(MegaBuilder& builder)
    {
        builder.queue_ecc_random_op();
        builder.queue_ecc_random_op();
    }
 
    static void construct_simple_circuit(MegaBuilder& builder, bool last_circuit = false)
    {
        PROFILE_THIS();
        // The last circuit to be accumulated must contain a no-op
        if (last_circuit) {
            builder.queue_ecc_no_op();
        }
 
        add_some_ecc_op_gates(builder);
        MockCircuits::construct_arithmetic_circuit(builder);
        bb::stdlib::recursion::honk::DefaultIO<MegaBuilder>::add_default(builder);
    }
 
    static void construct_mock_folding_kernel(MegaBuilder& builder)
    {
        PROFILE_THIS();
 
        // Add operations representing general kernel logic e.g. state updates. Note: these are structured to make
        // the kernel "full" within the dyadic size 2^17
        const size_t NUM_ECDSA_VERIFICATIONS = 2;
        const size_t NUM_SHA_HASHES = 10;
        stdlib::generate_ecdsa_verification_test_circuit(builder, NUM_ECDSA_VERIFICATIONS);
        generate_sha256_test_circuit<MegaBuilder>(builder, NUM_SHA_HASHES);
    }
};
} // namespace bb