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Merged
iakovenkos merged 17 commits into from
Feb 28, 2025
Merged

feat: extend functionality of SmallSubgroupIPA #12244

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a9531ec
almost compiling
iakovenkos Feb 24, 2025
60537ca
added failure test + docs
iakovenkos Feb 24, 2025
64d09df
eccvm translation data docs
iakovenkos Feb 24, 2025
63799f6
Merge branch 'master' into si/small-subgroup-ipa-supports-translation
iakovenkos Feb 24, 2025
a7e63c5
Merge branch 'si/small-subgroup-ipa-supports-translation' of github.c…
iakovenkos Feb 24, 2025
f0f8778
ck fix (?)
iakovenkos Feb 25, 2025
be5c7bf
fix transcript tests + docs
iakovenkos Feb 25, 2025
7a97ee3
Merge branch 'master' into si/small-subgroup-ipa-supports-translation
iakovenkos Feb 25, 2025
ee07343
review addressed
iakovenkos Feb 27, 2025
6e2d0c3
Merge branch 'si/small-subgroup-ipa-supports-translation' of github.c…
iakovenkos Feb 27, 2025
f54a046
Merge branch 'master' into si/small-subgroup-ipa-supports-translation
iakovenkos Feb 27, 2025
d001c13
Merge branch 'master' into si/small-subgroup-ipa-supports-translation
iakovenkos Feb 27, 2025
b886bcd
ck fix
iakovenkos Feb 28, 2025
417c8cb
Merge branch 'si/small-subgroup-ipa-supports-translation' of github.c…
iakovenkos Feb 28, 2025
5811213
Merge branch 'master' into si/small-subgroup-ipa-supports-translation
iakovenkos Feb 28, 2025
14a79db
fix ck (2)
iakovenkos Feb 28, 2025
ce5ef82
Merge branch 'si/small-subgroup-ipa-supports-translation' of github.c…
iakovenkos Feb 28, 2025
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30 changes: 15 additions & 15 deletions barretenberg/cpp/src/barretenberg/commitment_schemes/shplonk/shplemini.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,7 @@ template <typename Curve> class ShpleminiProver_ {
std::span<FF> multilinear_challenge,
const std::shared_ptr<CommitmentKey<Curve>>& commitment_key,
const std::shared_ptr<Transcript>& transcript,
const std::array<Polynomial, NUM_LIBRA_EVALUATIONS>& libra_polynomials = {},
const std::array<Polynomial, NUM_SMALL_IPA_EVALUATIONS>& libra_polynomials = {},
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@iakovenkos iakovenkos Feb 25, 2025

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this global const is rather a SmallSubgroupIPA constant. I haven't thought the argument would be used elsewehere, so initially called it NUM_LIBRA_EVALUATIONS

const std::vector<Polynomial>& sumcheck_round_univariates = {},
const std::vector<std::array<FF, 3>>& sumcheck_round_evaluations = {},
RefSpan<Polynomial> concatenated_polynomials = {},
Expand Down Expand Up @@ -77,7 +77,7 @@ template <typename Curve> class ShpleminiProver_ {
template <typename Transcript>
static std::vector<OpeningClaim> compute_libra_opening_claims(
const FF gemini_r,
const std::array<Polynomial, NUM_LIBRA_EVALUATIONS>& libra_polynomials,
const std::array<Polynomial, NUM_SMALL_IPA_EVALUATIONS>& libra_polynomials,
const std::shared_ptr<Transcript>& transcript)
{
OpeningClaim new_claim;
Expand All @@ -86,10 +86,10 @@ template <typename Curve> class ShpleminiProver_ {

static constexpr FF subgroup_generator = Curve::subgroup_generator;

std::array<std::string, NUM_LIBRA_EVALUATIONS> libra_eval_labels = {
"Libra:concatenation_eval", "Libra:shifted_big_sum_eval", "Libra:big_sum_eval", "Libra:quotient_eval"
std::array<std::string, NUM_SMALL_IPA_EVALUATIONS> libra_eval_labels = {
"Libra:concatenation_eval", "Libra:shifted_grand_sum_eval", "Libra:grand_sum_eval", "Libra:quotient_eval"
};
const std::array<FF, NUM_LIBRA_EVALUATIONS> evaluation_points = {
const std::array<FF, NUM_SMALL_IPA_EVALUATIONS> evaluation_points = {
gemini_r, gemini_r * subgroup_generator, gemini_r, gemini_r
};
for (size_t idx = 0; idx < 4; idx++) {
Expand Down Expand Up @@ -251,11 +251,11 @@ template <typename Curve> class ShpleminiVerifier_ {
const std::vector<Fr> gemini_eval_challenge_powers =
gemini::powers_of_evaluation_challenge(gemini_evaluation_challenge, CONST_PROOF_SIZE_LOG_N);

std::array<Fr, NUM_LIBRA_EVALUATIONS> libra_evaluations;
std::array<Fr, NUM_SMALL_IPA_EVALUATIONS> libra_evaluations;
if (has_zk) {
libra_evaluations[0] = transcript->template receive_from_prover<Fr>("Libra:concatenation_eval");
libra_evaluations[1] = transcript->template receive_from_prover<Fr>("Libra:shifted_big_sum_eval");
libra_evaluations[2] = transcript->template receive_from_prover<Fr>("Libra:big_sum_eval");
libra_evaluations[1] = transcript->template receive_from_prover<Fr>("Libra:shifted_grand_sum_eval");
libra_evaluations[2] = transcript->template receive_from_prover<Fr>("Libra:grand_sum_eval");
libra_evaluations[3] = transcript->template receive_from_prover<Fr>("Libra:quotient_eval");
}

Expand Down Expand Up @@ -373,7 +373,7 @@ template <typename Curve> class ShpleminiVerifier_ {
shplonk_batching_challenge,
shplonk_evaluation_challenge);

*consistency_checked = SmallSubgroupIPAVerifier<Curve>::check_evaluations_consistency(
*consistency_checked = SmallSubgroupIPAVerifier<Curve>::check_libra_evaluations_consistency(
libra_evaluations, gemini_evaluation_challenge, multivariate_challenge, libra_univariate_evaluation);
}

Expand Down Expand Up @@ -664,7 +664,7 @@ template <typename Curve> class ShpleminiVerifier_ {
std::vector<Fr>& scalars,
Fr& constant_term_accumulator,
const std::array<Commitment, NUM_LIBRA_COMMITMENTS>& libra_commitments,
const std::array<Fr, NUM_LIBRA_EVALUATIONS>& libra_evaluations,
const std::array<Fr, NUM_SMALL_IPA_EVALUATIONS>& libra_evaluations,
const Fr& gemini_evaluation_challenge,
const Fr& shplonk_batching_challenge,
const Fr& shplonk_evaluation_challenge)
Expand All @@ -682,8 +682,8 @@ template <typename Curve> class ShpleminiVerifier_ {
}

// compute corresponding scalars and the correction to the constant term
std::array<Fr, NUM_LIBRA_EVALUATIONS> denominators;
std::array<Fr, NUM_LIBRA_EVALUATIONS> batching_scalars;
std::array<Fr, NUM_SMALL_IPA_EVALUATIONS> denominators;
std::array<Fr, NUM_SMALL_IPA_EVALUATIONS> batching_scalars;
// compute Shplonk denominators and invert them
denominators[0] = Fr(1) / (shplonk_evaluation_challenge - gemini_evaluation_challenge);
denominators[1] =
Expand All @@ -693,7 +693,7 @@ template <typename Curve> class ShpleminiVerifier_ {

// compute the scalars to be multiplied against the commitments [libra_concatenated], [big_sum], [big_sum], and
// [libra_quotient]
for (size_t idx = 0; idx < NUM_LIBRA_EVALUATIONS; idx++) {
for (size_t idx = 0; idx < NUM_SMALL_IPA_EVALUATIONS; idx++) {
Fr scaling_factor = denominators[idx] * shplonk_challenge_power;
batching_scalars[idx] = -scaling_factor;
shplonk_challenge_power *= shplonk_batching_challenge;
Expand Down Expand Up @@ -763,7 +763,7 @@ template <typename Curve> class ShpleminiVerifier_ {

// Compute the next power of Shplonk batching challenge \nu
Fr shplonk_challenge_power = Fr{ 1 };
for (size_t j = 0; j < CONST_PROOF_SIZE_LOG_N + 2 + NUM_LIBRA_EVALUATIONS; ++j) {
for (size_t j = 0; j < CONST_PROOF_SIZE_LOG_N + 2 + NUM_SMALL_IPA_EVALUATIONS; ++j) {
shplonk_challenge_power *= shplonk_batching_challenge;
}

Expand Down Expand Up @@ -834,4 +834,4 @@ template <typename Curve> class ShpleminiVerifier_ {
}
};
};
} // namespace bb
} // namespace bb
8 changes: 5 additions & 3 deletions barretenberg/cpp/src/barretenberg/commitment_schemes/shplonk/shplemini.test.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -323,6 +323,7 @@ TYPED_TEST(ShpleminiTest, ShpleminiZKNoSumcheckOpenings)
// Instantiate SmallSubgroupIPAProver, this prover sends commitments to Big Sum and Quotient polynomials
SmallSubgroupIPAProver<TypeParam> small_subgroup_ipa_prover(
zk_sumcheck_data, const_size_mle_opening_point, claimed_inner_product, prover_transcript, ck);
small_subgroup_ipa_prover.prove();

// Reduce to KZG or IPA based on the curve used in the test Flavor
const auto opening_claim = ShpleminiProver::prove(this->n,
Expand Down Expand Up @@ -357,7 +358,7 @@ TYPED_TEST(ShpleminiTest, ShpleminiZKNoSumcheckOpenings)
EXPECT_EQ(libra_evaluation, claimed_inner_product);

// Finalize the array of Libra/SmallSubgroupIpa commitments
libra_commitments[1] = verifier_transcript->template receive_from_prover<Commitment>("Libra:big_sum_commitment");
libra_commitments[1] = verifier_transcript->template receive_from_prover<Commitment>("Libra:grand_sum_commitment");
libra_commitments[2] = verifier_transcript->template receive_from_prover<Commitment>("Libra:quotient_commitment");

// Used to verify the consistency of the evaluations of the concatenated libra polynomial, big sum polynomial, and
Expand Down Expand Up @@ -430,6 +431,7 @@ TYPED_TEST(ShpleminiTest, ShpleminiZKWithSumcheckOpenings)
// Instantiate SmallSubgroupIPAProver, this prover sends commitments to Big Sum and Quotient polynomials
SmallSubgroupIPAProver<TypeParam> small_subgroup_ipa_prover(
zk_sumcheck_data, challenge, claimed_inner_product, prover_transcript, ck);
small_subgroup_ipa_prover.prove();

// Reduce proving to a single claimed fed to KZG or IPA
const auto opening_claim = ShpleminiProver::prove(this->n,
Expand Down Expand Up @@ -465,7 +467,7 @@ TYPED_TEST(ShpleminiTest, ShpleminiZKWithSumcheckOpenings)
EXPECT_EQ(libra_evaluation, claimed_inner_product);

// Finalize the array of Libra/SmallSubgroupIpa commitments
libra_commitments[1] = verifier_transcript->template receive_from_prover<Commitment>("Libra:big_sum_commitment");
libra_commitments[1] = verifier_transcript->template receive_from_prover<Commitment>("Libra:grand_sum_commitment");
libra_commitments[2] = verifier_transcript->template receive_from_prover<Commitment>("Libra:quotient_commitment");

bool consistency_checked = true;
Expand Down Expand Up @@ -495,4 +497,4 @@ TYPED_TEST(ShpleminiTest, ShpleminiZKWithSumcheckOpenings)
EXPECT_EQ(this->vk()->pairing_check(pairing_points[0], pairing_points[1]), true);
}
}
} // namespace bb
} // namespace bb
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