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chore: removing hack commitment from eccvm (#8825)
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* removed hack commitment from eccvm
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@iakovenkos @Rumata888
iakovenkos authored and Rumata888 committed Sep 27, 2024
1 parent 4b7f89e commit c6633d8
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Showing 5 changed files with 34 additions and 57 deletions.
8 changes: 0 additions & 8 deletions barretenberg/cpp/src/barretenberg/eccvm/eccvm_flavor.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -937,13 +937,11 @@ class ECCVMFlavor {
std::array<FF, NUM_ALL_ENTITIES> sumcheck_evaluations;
std::vector<Commitment> zm_cq_comms;
Commitment zm_cq_comm;
Commitment translation_hack_comm;
FF translation_eval_op;
FF translation_eval_px;
FF translation_eval_py;
FF translation_eval_z1;
FF translation_eval_z2;
FF hack_eval;
Commitment shplonk_q_comm;
uint32_t ipa_poly_degree;
std::vector<Commitment> ipa_l_comms;
Expand Down Expand Up @@ -1151,8 +1149,6 @@ class ECCVMFlavor {
}
zm_cq_comm = NativeTranscript::template deserialize_from_buffer<Commitment>(proof_data, num_frs_read);

translation_hack_comm = NativeTranscript::template deserialize_from_buffer<Commitment>(
NativeTranscript::proof_data, num_frs_read);
translation_eval_op =
NativeTranscript::template deserialize_from_buffer<FF>(NativeTranscript::proof_data, num_frs_read);
translation_eval_px =
Expand All @@ -1163,8 +1159,6 @@ class ECCVMFlavor {
NativeTranscript::template deserialize_from_buffer<FF>(NativeTranscript::proof_data, num_frs_read);
translation_eval_z2 =
NativeTranscript::template deserialize_from_buffer<FF>(NativeTranscript::proof_data, num_frs_read);
hack_eval =
NativeTranscript::template deserialize_from_buffer<FF>(NativeTranscript::proof_data, num_frs_read);

shplonk_q_comm = NativeTranscript::template deserialize_from_buffer<Commitment>(proof_data, num_frs_read);

Expand Down Expand Up @@ -1297,13 +1291,11 @@ class ECCVMFlavor {
}
NativeTranscript::template serialize_to_buffer(zm_cq_comm, NativeTranscript::proof_data);

NativeTranscript::template serialize_to_buffer(translation_hack_comm, NativeTranscript::proof_data);
NativeTranscript::template serialize_to_buffer(translation_eval_op, NativeTranscript::proof_data);
NativeTranscript::template serialize_to_buffer(translation_eval_px, NativeTranscript::proof_data);
NativeTranscript::template serialize_to_buffer(translation_eval_py, NativeTranscript::proof_data);
NativeTranscript::template serialize_to_buffer(translation_eval_z1, NativeTranscript::proof_data);
NativeTranscript::template serialize_to_buffer(translation_eval_z2, NativeTranscript::proof_data);
NativeTranscript::template serialize_to_buffer(hack_eval, NativeTranscript::proof_data);

NativeTranscript::template serialize_to_buffer(shplonk_q_comm, NativeTranscript::proof_data);

Expand Down
30 changes: 10 additions & 20 deletions barretenberg/cpp/src/barretenberg/eccvm/eccvm_prover.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -129,16 +129,6 @@ void ECCVMProver::execute_pcs_rounds()
commitment_key,
transcript);

// Batch open the transcript polynomials as univariates for Translator consistency check. Since IPA cannot
// currently handle polynomials for which the latter half of the coefficients are 0, we hackily
// batch the constant polynomial 1 in with the 5 transcript polynomials.
// TODO(https://github.com/AztecProtocol/barretenberg/issues/768): fix IPA to avoid the need for the hack polynomial
Polynomial hack(key->circuit_size);
for (size_t idx = 0; idx < key->circuit_size; idx++) {
hack.at(idx) = 1;
}
transcript->send_to_verifier("Translation:hack_commitment", commitment_key->commit(hack));

// Get the challenge at which we evaluate all transcript polynomials as univariates
evaluation_challenge_x = transcript->template get_challenge<FF>("Translation:evaluation_challenge_x");

Expand All @@ -156,20 +146,20 @@ void ECCVMProver::execute_pcs_rounds()
transcript->send_to_verifier("Translation:z1", translation_evaluations.z1);
transcript->send_to_verifier("Translation:z2", translation_evaluations.z2);

FF hack_evaluation = hack.evaluate(evaluation_challenge_x);
transcript->send_to_verifier("Translation:hack_evaluation", hack_evaluation);

// Get another challenge for batching the univariates and evaluations
FF ipa_batching_challenge = transcript->template get_challenge<FF>("Translation:ipa_batching_challenge");

// Collect the polynomials and evaluations to be batched
RefArray univariate_polynomials{ key->polynomials.transcript_op, key->polynomials.transcript_Px,
key->polynomials.transcript_Py, key->polynomials.transcript_z1,
key->polynomials.transcript_z2, hack };
std::array<FF, univariate_polynomials.size()> univariate_evaluations{
translation_evaluations.op, translation_evaluations.Px, translation_evaluations.Py,
translation_evaluations.z1, translation_evaluations.z2, hack_evaluation
};
RefArray univariate_polynomials{ key->polynomials.transcript_op,
key->polynomials.transcript_Px,
key->polynomials.transcript_Py,
key->polynomials.transcript_z1,
key->polynomials.transcript_z2 };
std::array<FF, univariate_polynomials.size()> univariate_evaluations{ translation_evaluations.op,
translation_evaluations.Px,
translation_evaluations.Py,
translation_evaluations.z1,
translation_evaluations.z2 };

// Construct the batched polynomial and batched evaluation to produce the batched opening claim
Polynomial batched_univariate{ key->circuit_size };
Expand Down
2 changes: 0 additions & 2 deletions barretenberg/cpp/src/barretenberg/eccvm/eccvm_transcript.test.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -162,7 +162,6 @@ class ECCVMTranscriptTests : public ::testing::Test {
manifest_expected.add_challenge(round, "ZM:x", "ZM:z");

round++;
manifest_expected.add_entry(round, "Translation:hack_commitment", frs_per_G);
manifest_expected.add_challenge(round, "Translation:evaluation_challenge_x");

round++;
Expand All @@ -171,7 +170,6 @@ class ECCVMTranscriptTests : public ::testing::Test {
manifest_expected.add_entry(round, "Translation:Py", frs_per_Fr);
manifest_expected.add_entry(round, "Translation:z1", frs_per_Fr);
manifest_expected.add_entry(round, "Translation:z2", frs_per_Fr);
manifest_expected.add_entry(round, "Translation:hack_evaluation", frs_per_Fr);
manifest_expected.add_challenge(round, "Translation:ipa_batching_challenge");

round++;
Expand Down
28 changes: 13 additions & 15 deletions barretenberg/cpp/src/barretenberg/eccvm/eccvm_verifier.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -69,35 +69,33 @@ bool ECCVMVerifier::verify_proof(const HonkProof& proof)
multivariate_challenge,
key->pcs_verification_key->get_g1_identity(),
transcript);

// Execute transcript consistency univariate opening round
auto hack_commitment = transcript->template receive_from_prover<Commitment>("Translation:hack_commitment");

FF evaluation_challenge_x = transcript->template get_challenge<FF>("Translation:evaluation_challenge_x");
const FF evaluation_challenge_x = transcript->template get_challenge<FF>("Translation:evaluation_challenge_x");

// Construct arrays of commitments and evaluations to be batched, the evaluations being received from the prover
const size_t NUM_UNIVARIATES = 6;
std::array<Commitment, NUM_UNIVARIATES> transcript_commitments = {
commitments.transcript_op, commitments.transcript_Px, commitments.transcript_Py,
commitments.transcript_z1, commitments.transcript_z2, hack_commitment
};
const size_t NUM_UNIVARIATES = 5;
std::array<Commitment, NUM_UNIVARIATES> transcript_commitments = { commitments.transcript_op,
commitments.transcript_Px,
commitments.transcript_Py,
commitments.transcript_z1,
commitments.transcript_z2 };
std::array<FF, NUM_UNIVARIATES> transcript_evaluations = {
transcript->template receive_from_prover<FF>("Translation:op"),
transcript->template receive_from_prover<FF>("Translation:Px"),
transcript->template receive_from_prover<FF>("Translation:Py"),
transcript->template receive_from_prover<FF>("Translation:z1"),
transcript->template receive_from_prover<FF>("Translation:z2"),
transcript->template receive_from_prover<FF>("Translation:hack_evaluation")
transcript->template receive_from_prover<FF>("Translation:z2")
};

// Get the batching challenge for commitments and evaluations
FF ipa_batching_challenge = transcript->template get_challenge<FF>("Translation:ipa_batching_challenge");
const FF ipa_batching_challenge = transcript->template get_challenge<FF>("Translation:ipa_batching_challenge");

// Compute the batched commitment and batched evaluation for the univariate opening claim
auto batched_commitment = transcript_commitments[0];
auto batched_transcript_eval = transcript_evaluations[0];
auto batching_scalar = ipa_batching_challenge;
for (size_t idx = 1; idx < transcript_commitments.size(); ++idx) {
Commitment batched_commitment = transcript_commitments[0];
FF batched_transcript_eval = transcript_evaluations[0];
FF batching_scalar = ipa_batching_challenge;
for (size_t idx = 1; idx < NUM_UNIVARIATES; ++idx) {
batched_commitment = batched_commitment + transcript_commitments[idx] * batching_scalar;
batched_transcript_eval += batching_scalar * transcript_evaluations[idx];
batching_scalar *= ipa_batching_challenge;
Expand Down
23 changes: 11 additions & 12 deletions barretenberg/cpp/src/barretenberg/stdlib/eccvm_verifier/eccvm_recursive_verifier.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,7 @@ template <typename Flavor> void ECCVMRecursiveVerifier_<Flavor>::verify_proof(co
}

// Get challenge for sorted list batching and wire four memory records
auto [beta, gamma] = transcript->template get_challenges<FF>("beta", "gamma");
const auto [beta, gamma] = transcript->template get_challenges<FF>("beta", "gamma");

auto beta_sqr = beta * beta;

Expand All @@ -63,7 +63,7 @@ template <typename Flavor> void ECCVMRecursiveVerifier_<Flavor>::verify_proof(co
// sumcheck is dependent on circuit size.
const size_t log_circuit_size = numeric::get_msb(static_cast<uint32_t>(circuit_size.get_value()));
auto sumcheck = SumcheckVerifier<Flavor>(log_circuit_size, transcript, FF(0));
FF alpha = transcript->template get_challenge<FF>("Sumcheck:alpha");
const FF alpha = transcript->template get_challenge<FF>("Sumcheck:alpha");
std::vector<FF> gate_challenges(static_cast<size_t>(numeric::get_msb(key->circuit_size)));
for (size_t idx = 0; idx < gate_challenges.size(); idx++) {
gate_challenges[idx] = transcript->template get_challenge<FF>("Sumcheck:gate_challenge_" + std::to_string(idx));
Expand All @@ -80,25 +80,24 @@ template <typename Flavor> void ECCVMRecursiveVerifier_<Flavor>::verify_proof(co
multivariate_challenge,
key->pcs_verification_key->get_g1_identity(),
transcript);
auto hack_commitment = transcript->template receive_from_prover<Commitment>("Translation:hack_commitment");

FF evaluation_challenge_x = transcript->template get_challenge<FF>("Translation:evaluation_challenge_x");
const FF evaluation_challenge_x = transcript->template get_challenge<FF>("Translation:evaluation_challenge_x");

// Construct the vector of commitments (needs to be vector for the batch_mul) and array of evaluations to be batched
std::vector<Commitment> transcript_commitments = { commitments.transcript_op, commitments.transcript_Px,
commitments.transcript_Py, commitments.transcript_z1,
commitments.transcript_z2, hack_commitment };
std::vector<Commitment> transcript_commitments = { commitments.transcript_op,
commitments.transcript_Px,
commitments.transcript_Py,
commitments.transcript_z1,
commitments.transcript_z2 };

std::vector<FF> transcript_evaluations = { transcript->template receive_from_prover<FF>("Translation:op"),
transcript->template receive_from_prover<FF>("Translation:Px"),
transcript->template receive_from_prover<FF>("Translation:Py"),
transcript->template receive_from_prover<FF>("Translation:z1"),
transcript->template receive_from_prover<FF>("Translation:z2"),
transcript->template receive_from_prover<FF>(
"Translation:hack_evaluation") };
transcript->template receive_from_prover<FF>("Translation:z2") };

// Get the batching challenge for commitments and evaluations
FF ipa_batching_challenge = transcript->template get_challenge<FF>("Translation:ipa_batching_challenge");
const FF ipa_batching_challenge = transcript->template get_challenge<FF>("Translation:ipa_batching_challenge");

// Compute the batched commitment and batched evaluation for the univariate opening claim
auto batched_transcript_eval = transcript_evaluations[0];
Expand All @@ -110,7 +109,7 @@ template <typename Flavor> void ECCVMRecursiveVerifier_<Flavor>::verify_proof(co
batching_challenges.emplace_back(batching_scalar);
batching_scalar *= ipa_batching_challenge;
}
auto batched_commitment = Commitment::batch_mul(transcript_commitments, batching_challenges);
const Commitment batched_commitment = Commitment::batch_mul(transcript_commitments, batching_challenges);

// Construct and verify the combined opening claim
OpeningClaim<Curve> batched_univariate_claim = { { evaluation_challenge_x, batched_transcript_eval },
Expand Down

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