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Da: fk20 encoder (#664) 

* Use fft for rs

* Specify evaluation domains

* Fix domains in verifier, decoder and dispersal

* Fix domains in verifier, decoder and dispersal

* Fix size in verifier to fit tests
This commit is contained in:
Daniel Sanchez 2024-06-25 13:16:25 +02:00 committed by GitHub
parent 9adfbdddc6
commit 96a8ef6032
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GPG Key ID: B5690EEEBB952194
7 changed files with 194 additions and 133 deletions
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10
nomos-da/kzgrs-backend/Cargo.toml
View File

@ -20,7 +20,17 @@ rand = "0.8.5"
once_cell = "1.19"
sha3 = "0.10"
serde = { version = "1.0", features = ["derive"] }
rayon = { version = "1.10.0", optional = true }
[dev-dependencies]
rand = "0.8"
ark-bls12-381 = "0.4.0"
[features]
default = []
single = []
parallel = [
"rayon",
"kzgrs/parallel"
]

3
nomos-da/kzgrs-backend/src/dispersal.rs
View File

@ -250,6 +250,7 @@ mod tests {
verifiers: &[DaVerifier],
) -> Vec<Attestation> {
let mut attestations = Vec::new();
let domain_size = encoded_data.extended_data.0[0].len();
for (i, column) in encoded_data.extended_data.columns().enumerate() {
let verifier = &verifiers[i];
let da_blob = DaBlob {
@ -264,7 +265,7 @@ mod tests {
.map(|proofs| proofs.get(i).cloned().unwrap())
.collect(),
};
attestations.push(verifier.verify(da_blob).unwrap());
attestations.push(verifier.verify(da_blob, domain_size).unwrap());
}
attestations
}

202
nomos-da/kzgrs-backend/src/encoder.rs
View File

@ -3,15 +3,17 @@ use std::ops::Div;
// crates
use ark_ff::{BigInteger, PrimeField};
use ark_poly::EvaluationDomain;
use kzgrs::common::bytes_to_polynomial_unchecked;
use kzgrs::fk20::fk20_batch_generate_elements_proofs;
use kzgrs::{
bytes_to_polynomial, commit_polynomial, encode, generate_element_proof, Commitment,
Evaluations, KzgRsError, Polynomial, Proof, BYTES_PER_FIELD_ELEMENT,
bytes_to_polynomial, commit_polynomial, encode, Commitment, Evaluations, KzgRsError,
Polynomial, PolynomialEvaluationDomain, Proof, BYTES_PER_FIELD_ELEMENT,
};
// internal
use crate::common::{hash_column_and_commitment, Chunk, ChunksMatrix, Row};
use crate::global::{DOMAIN, GLOBAL_PARAMETERS};
use crate::global::GLOBAL_PARAMETERS;
#[derive(Copy, Clone)]
pub struct DaEncoderParams {
@ -67,6 +69,7 @@ impl DaEncoder {
#[allow(clippy::type_complexity)]
fn compute_kzg_row_commitments(
matrix: &ChunksMatrix,
polynomial_evaluation_domain: PolynomialEvaluationDomain,
) -> Result<Vec<((Evaluations, Polynomial), Commitment)>, KzgRsError> {
matrix
.rows()
@ -76,7 +79,7 @@ impl DaEncoder {
// Also, after rs encoding, we are sure all `Fr` elements already fits within modulus.
let (evals, poly) = bytes_to_polynomial_unchecked::<BYTES_PER_FIELD_ELEMENT>(
r.as_bytes().as_ref(),
*DOMAIN,
polynomial_evaluation_domain,
);
commit_polynomial(&poly, &GLOBAL_PARAMETERS)
.map(|commitment| ((evals, poly), commitment))
@ -84,42 +87,41 @@ impl DaEncoder {
.collect()
}
fn rs_encode_row(evaluations: &Evaluations, row: &Polynomial) -> Evaluations {
encode(row, evaluations, 2, *DOMAIN)
fn rs_encode_row(
row: &Polynomial,
polynomial_evaluation_domain: PolynomialEvaluationDomain,
) -> Evaluations {
encode(row, polynomial_evaluation_domain)
}
fn rs_encode_rows(rows: &[(Evaluations, Polynomial)]) -> Vec<Evaluations> {
fn rs_encode_rows(
rows: &[Polynomial],
polynomial_evaluation_domain: PolynomialEvaluationDomain,
) -> Vec<Evaluations> {
rows.iter()
.map(|(eval, poly)| Self::rs_encode_row(eval, poly))
.map(|poly| Self::rs_encode_row(poly, polynomial_evaluation_domain))
.collect()
}
fn compute_rows_proofs(
polynomials: &[Polynomial],
evals: &[Evaluations],
proof_count: usize,
) -> Result<Vec<Vec<Proof>>, KzgRsError> {
polynomials
fn compute_rows_proofs(polynomials: &[Polynomial]) -> Result<Vec<Vec<Proof>>, KzgRsError> {
Ok(polynomials
.iter()
.zip(evals)
.map(|(poly, eval)| {
(0..proof_count)
.map(|i| generate_element_proof(i, poly, eval, &GLOBAL_PARAMETERS, *DOMAIN))
.collect()
})
.collect()
.map(|poly| fk20_batch_generate_elements_proofs(poly, &GLOBAL_PARAMETERS))
.collect())
}
#[allow(clippy::type_complexity)]
fn compute_kzg_column_commitments(
matrix: &ChunksMatrix,
polynomial_evaluation_domain: PolynomialEvaluationDomain,
) -> Result<Vec<((Evaluations, Polynomial), Commitment)>, KzgRsError> {
Self::compute_kzg_row_commitments(&matrix.transposed())
Self::compute_kzg_row_commitments(&matrix.transposed(), polynomial_evaluation_domain)
}
fn compute_aggregated_column_commitment(
matrix: &ChunksMatrix,
commitments: &[Commitment],
polynomial_evaluation_domain: PolynomialEvaluationDomain,
) -> Result<((Evaluations, Polynomial), Commitment), KzgRsError> {
let hashes: Vec<u8> =
matrix
@ -133,19 +135,16 @@ impl DaEncoder {
.collect();
let (evals, poly) = bytes_to_polynomial::<
{ DaEncoderParams::MAX_BLS12_381_ENCODING_CHUNK_SIZE },
>(hashes.as_ref(), *DOMAIN)?;
>(hashes.as_ref(), polynomial_evaluation_domain)?;
let commitment = commit_polynomial(&poly, &GLOBAL_PARAMETERS)?;
Ok(((evals, poly), commitment))
}
fn compute_aggregated_column_proofs(
polynomial: &Polynomial,
evals: &Evaluations,
proof_count: usize,
) -> Result<Vec<Proof>, KzgRsError> {
(0..proof_count)
.map(|i| generate_element_proof(i, polynomial, evals, &GLOBAL_PARAMETERS, *DOMAIN))
.collect()
fn compute_aggregated_column_proofs(polynomial: &Polynomial) -> Result<Vec<Proof>, KzgRsError> {
Ok(fk20_batch_generate_elements_proofs(
polynomial,
&GLOBAL_PARAMETERS,
))
}
fn evals_to_chunk_matrix(evals: &[Evaluations]) -> ChunksMatrix {
@ -165,29 +164,30 @@ impl DaEncoder {
pub fn encode(&self, data: &[u8]) -> Result<EncodedData, kzgrs::KzgRsError> {
let chunked_data = self.chunkify(data);
let row_domain = PolynomialEvaluationDomain::new(self.params.column_count)
.expect("Domain should be able to build");
let column_domain = PolynomialEvaluationDomain::new(chunked_data.len())
.expect("Domain should be able to build");
let (row_polynomials, row_commitments): (Vec<_>, Vec<_>) =
Self::compute_kzg_row_commitments(&chunked_data)?
Self::compute_kzg_row_commitments(&chunked_data, row_domain)?
.into_iter()
.unzip();
let encoded_evaluations = Self::rs_encode_rows(&row_polynomials);
let (_, row_polynomials): (Vec<_>, Vec<_>) = row_polynomials.into_iter().unzip();
let encoded_evaluations = Self::rs_encode_rows(&row_polynomials, row_domain);
let extended_data = Self::evals_to_chunk_matrix(&encoded_evaluations);
let row_polynomials: Vec<_> = row_polynomials.into_iter().map(|(_, p)| p).collect();
let rows_proofs = Self::compute_rows_proofs(
&row_polynomials,
&encoded_evaluations,
self.params.column_count,
)?;
let rows_proofs = Self::compute_rows_proofs(&row_polynomials)?;
let (_column_polynomials, column_commitments): (Vec<_>, Vec<_>) =
Self::compute_kzg_column_commitments(&extended_data)?
Self::compute_kzg_column_commitments(&extended_data, column_domain)?
.into_iter()
.unzip();
let ((aggregated_evals, aggregated_polynomial), aggregated_column_commitment) =
Self::compute_aggregated_column_commitment(&extended_data, &column_commitments)?;
let aggregated_column_proofs = Self::compute_aggregated_column_proofs(
&aggregated_polynomial,
&aggregated_evals,
column_commitments.len(),
let ((_aggregated_evals, aggregated_polynomial), aggregated_column_commitment) =
Self::compute_aggregated_column_commitment(
&extended_data,
&column_commitments,
row_domain,
)?;
let aggregated_column_proofs =
Self::compute_aggregated_column_proofs(&aggregated_polynomial)?;
Ok(EncodedData {
data: data.to_vec(),
chunked_data,
@ -204,15 +204,20 @@ impl DaEncoder {
#[cfg(test)]
pub mod test {
use crate::encoder::{DaEncoder, DaEncoderParams};
use crate::global::{DOMAIN, GLOBAL_PARAMETERS};
use crate::global::GLOBAL_PARAMETERS;
use ark_ff::PrimeField;
use ark_poly::{EvaluationDomain, GeneralEvaluationDomain};
use itertools::izip;
use kzgrs::common::bytes_to_polynomial_unchecked;
use kzgrs::{decode, verify_element_proof, FieldElement, BYTES_PER_FIELD_ELEMENT};
use kzgrs::{
decode, verify_element_proof, FieldElement, PolynomialEvaluationDomain,
BYTES_PER_FIELD_ELEMENT,
};
use rand::RngCore;
use std::ops::Div;
pub const PARAMS: DaEncoderParams = DaEncoderParams::default_with(16);
pub const DOMAIN_SIZE: usize = 16;
pub const PARAMS: DaEncoderParams = DaEncoderParams::default_with(DOMAIN_SIZE);
pub const ENCODER: DaEncoder = DaEncoder::new(PARAMS);
pub fn rand_data(elements_count: usize) -> Vec<u8> {
@ -238,8 +243,9 @@ pub mod test {
#[test]
fn test_compute_row_kzg_commitments() {
let data = rand_data(32);
let domain = GeneralEvaluationDomain::new(DOMAIN_SIZE).unwrap();
let matrix = ENCODER.chunkify(data.as_ref());
let commitments_data = DaEncoder::compute_kzg_row_commitments(&matrix).unwrap();
let commitments_data = DaEncoder::compute_kzg_row_commitments(&matrix, domain).unwrap();
assert_eq!(commitments_data.len(), matrix.len());
}
@ -247,11 +253,14 @@ pub mod test {
fn test_evals_to_chunk_matrix() {
let data = rand_data(32);
let matrix = ENCODER.chunkify(data.as_ref());
let (poly_data, _): (Vec<_>, Vec<_>) = DaEncoder::compute_kzg_row_commitments(&matrix)
let domain = PolynomialEvaluationDomain::new(DOMAIN_SIZE).unwrap();
let (poly_data, _): (Vec<_>, Vec<_>) =
DaEncoder::compute_kzg_row_commitments(&matrix, domain)
.unwrap()
.into_iter()
.unzip();
let extended_rows = DaEncoder::rs_encode_rows(&poly_data);
let (_, poly_data): (Vec<_>, Vec<_>) = poly_data.into_iter().unzip();
let extended_rows = DaEncoder::rs_encode_rows(&poly_data, domain);
let extended_matrix = DaEncoder::evals_to_chunk_matrix(&extended_rows);
for (r1, r2) in izip!(matrix.iter(), extended_matrix.iter()) {
for (c1, c2) in izip!(r1.iter(), r2.iter()) {
@ -263,13 +272,15 @@ pub mod test {
#[test]
fn test_rs_encode_rows() {
let data = rand_data(32);
let domain = GeneralEvaluationDomain::new(DOMAIN_SIZE).unwrap();
let matrix = ENCODER.chunkify(data.as_ref());
let (poly_data, _): (Vec<_>, Vec<_>) = DaEncoder::compute_kzg_row_commitments(&matrix)
let (poly_data, _): (Vec<_>, Vec<_>) =
DaEncoder::compute_kzg_row_commitments(&matrix, domain)
.unwrap()
.into_iter()
.unzip();
let extended_rows = DaEncoder::rs_encode_rows(&poly_data);
let (evals, _): (Vec<_>, Vec<_>) = poly_data.into_iter().unzip();
let (evals, polynomials): (Vec<_>, Vec<_>) = poly_data.into_iter().unzip();
let extended_rows = DaEncoder::rs_encode_rows(&polynomials, domain);
// check encoding went well, original evaluation points vs extended ones
for (e1, e2) in izip!(evals.iter(), extended_rows.iter()) {
for (c1, c2) in izip!(&e1.evals, &e2.evals) {
@ -283,10 +294,10 @@ pub mod test {
assert_eq!(c1, c2);
}
let points: Vec<_> = evals.evals.iter().cloned().map(Some).collect();
let poly_2 = decode(r1.len(), &points, *DOMAIN);
let poly_2 = decode(r1.len(), &points, domain);
let (poly_1, _) = bytes_to_polynomial_unchecked::<BYTES_PER_FIELD_ELEMENT>(
r1.as_bytes().as_ref(),
*DOMAIN,
domain,
);
assert_eq!(poly_1, poly_2);
}
@ -295,28 +306,21 @@ pub mod test {
#[test]
fn test_compute_row_proofs() {
let data = rand_data(32);
let domain = GeneralEvaluationDomain::new(DOMAIN_SIZE).unwrap();
let matrix = ENCODER.chunkify(data.as_ref());
let (poly_data, commitments): (Vec<_>, Vec<_>) =
DaEncoder::compute_kzg_row_commitments(&matrix)
DaEncoder::compute_kzg_row_commitments(&matrix, domain)
.unwrap()
.into_iter()
.unzip();
let extended_evaluations = DaEncoder::rs_encode_rows(&poly_data);
let (evals, polynomials): (Vec<_>, Vec<_>) = poly_data.into_iter().unzip();
let (_evals, polynomials): (Vec<_>, Vec<_>) = poly_data.into_iter().unzip();
let extended_evaluations = DaEncoder::rs_encode_rows(&polynomials, domain);
let extended_matrix = DaEncoder::evals_to_chunk_matrix(&extended_evaluations);
let original_proofs =
DaEncoder::compute_rows_proofs(&polynomials, &evals, PARAMS.column_count.div(2))
.unwrap();
let extended_proofs = DaEncoder::compute_rows_proofs(
&polynomials,
&extended_evaluations,
PARAMS.column_count,
)
.unwrap();
let proofs = DaEncoder::compute_rows_proofs(&polynomials).unwrap();
let checks = izip!(matrix.iter(), &commitments, &original_proofs);
let checks = izip!(matrix.iter(), &commitments, &proofs);
for (row, commitment, proofs) in checks {
assert_eq!(proofs.len(), row.len());
assert_eq!(proofs.len(), row.len() * 2);
for (i, chunk) in row.iter().enumerate() {
let element = FieldElement::from_le_bytes_mod_order(chunk.as_bytes().as_ref());
assert!(verify_element_proof(
@ -324,12 +328,12 @@ pub mod test {
&element,
&commitment,
&proofs[i],
*DOMAIN,
domain,
&GLOBAL_PARAMETERS
));
}
}
let checks = izip!(extended_matrix.iter(), &commitments, &extended_proofs);
let checks = izip!(extended_matrix.iter(), &commitments, &proofs);
for (row, commitment, proofs) in checks {
assert_eq!(proofs.len(), row.len());
for (i, chunk) in row.iter().enumerate() {
@ -339,7 +343,7 @@ pub mod test {
&element,
&commitment,
&proofs[i],
*DOMAIN,
domain,
&GLOBAL_PARAMETERS
));
}
@ -349,8 +353,9 @@ pub mod test {
#[test]
fn test_compute_column_kzg_commitments() {
let data = rand_data(32);
let domain = GeneralEvaluationDomain::new(DOMAIN_SIZE).unwrap();
let matrix = ENCODER.chunkify(data.as_ref());
let commitments_data = DaEncoder::compute_kzg_column_commitments(&matrix).unwrap();
let commitments_data = DaEncoder::compute_kzg_column_commitments(&matrix, domain).unwrap();
assert_eq!(commitments_data.len(), matrix.columns().count());
}
@ -358,25 +363,58 @@ pub mod test {
fn test_compute_aggregated_column_kzg_commitment() {
let data = rand_data(32);
let matrix = ENCODER.chunkify(data.as_ref());
let (_, commitments): (Vec<_>, Vec<_>) = DaEncoder::compute_kzg_column_commitments(&matrix)
let domain = GeneralEvaluationDomain::new(DOMAIN_SIZE).unwrap();
let (_, commitments): (Vec<_>, Vec<_>) =
DaEncoder::compute_kzg_column_commitments(&matrix, domain)
.unwrap()
.into_iter()
.unzip();
let _ = DaEncoder::compute_aggregated_column_commitment(&matrix, &commitments).unwrap();
let _ =
DaEncoder::compute_aggregated_column_commitment(&matrix, &commitments, domain).unwrap();
}
#[test]
fn test_compute_aggregated_column_kzg_proofs() {
let data = rand_data(32);
let matrix = ENCODER.chunkify(data.as_ref());
let domain = GeneralEvaluationDomain::new(DOMAIN_SIZE).unwrap();
let (_poly_data, commitments): (Vec<_>, Vec<_>) =
DaEncoder::compute_kzg_column_commitments(&matrix)
DaEncoder::compute_kzg_column_commitments(&matrix, domain)
.unwrap()
.into_iter()
.unzip();
let ((evals, polynomial), _aggregated_commitment) =
DaEncoder::compute_aggregated_column_commitment(&matrix, &commitments).unwrap();
DaEncoder::compute_aggregated_column_proofs(&polynomial, &evals, commitments.len())
.unwrap();
let ((_evals, polynomial), _aggregated_commitment) =
DaEncoder::compute_aggregated_column_commitment(&matrix, &commitments, domain).unwrap();
DaEncoder::compute_aggregated_column_proofs(&polynomial).unwrap();
}
#[test]
fn test_full_encode_flow() {
let data = rand_data(32);
let domain = GeneralEvaluationDomain::new(DOMAIN_SIZE).unwrap();
let encoding_data = ENCODER.encode(&data).unwrap();
assert_eq!(encoding_data.data, data);
assert_eq!(encoding_data.row_commitments.len(), 4);
assert_eq!(encoding_data.column_commitments.len(), 16);
assert_eq!(encoding_data.rows_proofs.len(), 4);
assert_eq!(encoding_data.rows_proofs[0].len(), 16);
assert_eq!(encoding_data.aggregated_column_proofs.len(), 16);
for (row, proofs, commitment) in izip!(
encoding_data.extended_data.rows(),
encoding_data.rows_proofs,
encoding_data.row_commitments
) {
for (chunk_idx, chunk) in row.iter().enumerate() {
let element = FieldElement::from_le_bytes_mod_order(chunk.as_bytes().as_ref());
assert!(verify_element_proof(
chunk_idx,
&element,
&commitment,
&proofs[chunk_idx],
domain,
&GLOBAL_PARAMETERS
));
}
}
}
}

6
nomos-da/kzgrs-backend/src/global.rs
View File

@ -1,11 +1,7 @@
use ark_poly::EvaluationDomain;
use kzgrs::{global_parameters_from_randomness, GlobalParameters, PolynomialEvaluationDomain};
use kzgrs::{global_parameters_from_randomness, GlobalParameters};
use once_cell::sync::Lazy;
pub static GLOBAL_PARAMETERS: Lazy<GlobalParameters> = Lazy::new(|| {
let mut rng = rand::thread_rng();
global_parameters_from_randomness(&mut rng)
});
pub static DOMAIN: Lazy<PolynomialEvaluationDomain> =
Lazy::new(|| PolynomialEvaluationDomain::new(8192).unwrap());

57
nomos-da/kzgrs-backend/src/verifier.rs
View File

@ -1,12 +1,13 @@
// std
use ark_poly::EvaluationDomain;
// crates
use blst::min_sig::{PublicKey, SecretKey};
use itertools::{izip, Itertools};
use kzgrs::common::field_element_from_bytes_le;
use kzgrs::{
bytes_to_polynomial, commit_polynomial, verify_element_proof, Commitment, Proof,
BYTES_PER_FIELD_ELEMENT,
bytes_to_polynomial, commit_polynomial, verify_element_proof, Commitment,
PolynomialEvaluationDomain, Proof, BYTES_PER_FIELD_ELEMENT,
};
use crate::common::blob::DaBlob;
@ -16,7 +17,7 @@ use crate::common::{
attestation::Attestation, build_attestation_message, hash_column_and_commitment, Chunk, Column,
};
use crate::encoder::DaEncoderParams;
use crate::global::{DOMAIN, GLOBAL_PARAMETERS};
use crate::global::GLOBAL_PARAMETERS;
pub struct DaVerifier {
// TODO: substitute this for an abstraction to sign things over
@ -43,11 +44,15 @@ impl DaVerifier {
aggregated_column_commitment: &Commitment,
aggregated_column_proof: &Proof,
index: usize,
rows_domain: PolynomialEvaluationDomain,
) -> bool {
let column_domain =
PolynomialEvaluationDomain::new(column.len()).expect("Domain should be able to build");
// 1. compute commitment for column
let Ok((_, polynomial)) =
bytes_to_polynomial::<BYTES_PER_FIELD_ELEMENT>(column.as_bytes().as_slice(), *DOMAIN)
else {
let Ok((_, polynomial)) = bytes_to_polynomial::<BYTES_PER_FIELD_ELEMENT>(
column.as_bytes().as_slice(),
column_domain,
) else {
return false;
};
let Ok(computed_column_commitment) = commit_polynomial(&polynomial, &GLOBAL_PARAMETERS)
@ -69,19 +74,25 @@ impl DaVerifier {
&element,
aggregated_column_commitment,
aggregated_column_proof,
*DOMAIN,
rows_domain,
&GLOBAL_PARAMETERS,
)
}
fn verify_chunk(chunk: &Chunk, commitment: &Commitment, proof: &Proof, index: usize) -> bool {
fn verify_chunk(
chunk: &Chunk,
commitment: &Commitment,
proof: &Proof,
index: usize,
domain: PolynomialEvaluationDomain,
) -> bool {
let element = field_element_from_bytes_le(chunk.as_bytes().as_slice());
verify_element_proof(
index,
&element,
commitment,
proof,
*DOMAIN,
domain,
&GLOBAL_PARAMETERS,
)
}
@ -91,6 +102,7 @@ impl DaVerifier {
commitments: &[Commitment],
proofs: &[Proof],
index: usize,
domain: PolynomialEvaluationDomain,
) -> bool {
if ![chunks.len(), commitments.len(), proofs.len()]
.iter()
@ -99,7 +111,7 @@ impl DaVerifier {
return false;
}
for (chunk, commitment, proof) in izip!(chunks, commitments, proofs) {
if !DaVerifier::verify_chunk(chunk, commitment, proof, index) {
if !DaVerifier::verify_chunk(chunk, commitment, proof, index, domain) {
return false;
}
}
@ -122,13 +134,16 @@ impl DaVerifier {
}
}
pub fn verify(&self, blob: DaBlob) -> Option<Attestation> {
pub fn verify(&self, blob: DaBlob, rows_domain_size: usize) -> Option<Attestation> {
let rows_domain = PolynomialEvaluationDomain::new(rows_domain_size)
.expect("Domain should be able to build");
let is_column_verified = DaVerifier::verify_column(
&blob.column,
&blob.column_commitment,
&blob.aggregated_column_commitment,
&blob.aggregated_column_proof,
self.index,
rows_domain,
);
if !is_column_verified {
return None;
@ -139,6 +154,7 @@ impl DaVerifier {
&blob.rows_commitments,
&blob.rows_proofs,
self.index,
rows_domain,
);
if !are_chunks_verified {
return None;
@ -153,8 +169,9 @@ mod test {
use crate::common::{hash_column_and_commitment, Chunk, Column};
use crate::encoder::test::{rand_data, ENCODER};
use crate::encoder::DaEncoderParams;
use crate::global::{DOMAIN, GLOBAL_PARAMETERS};
use crate::global::GLOBAL_PARAMETERS;
use crate::verifier::DaVerifier;
use ark_poly::{EvaluationDomain, GeneralEvaluationDomain};
use blst::min_sig::SecretKey;
use kzgrs::{
bytes_to_polynomial, commit_polynomial, generate_element_proof, BYTES_PER_FIELD_ELEMENT,
@ -164,8 +181,9 @@ mod test {
#[test]
fn test_verify_column() {
let column: Column = (0..10).map(|i| Chunk(vec![i; 32])).collect();
let domain = GeneralEvaluationDomain::new(10).unwrap();
let (_, column_poly) =
bytes_to_polynomial::<BYTES_PER_FIELD_ELEMENT>(column.as_bytes().as_slice(), *DOMAIN)
bytes_to_polynomial::<BYTES_PER_FIELD_ELEMENT>(column.as_bytes().as_slice(), domain)
.unwrap();
let column_commitment = commit_polynomial(&column_poly, &GLOBAL_PARAMETERS).unwrap();
let (aggregated_evals, aggregated_poly) = bytes_to_polynomial::<
@ -176,7 +194,7 @@ mod test {
&column_commitment,
)
.as_slice(),
*DOMAIN,
domain,
)
.unwrap();
let aggregated_commitment =
@ -186,7 +204,7 @@ mod test {
&aggregated_poly,
&aggregated_evals,
&GLOBAL_PARAMETERS,
*DOMAIN,
domain,
)
.unwrap();
assert!(DaVerifier::verify_column(
@ -194,14 +212,16 @@ mod test {
&column_commitment,
&aggregated_commitment,
&column_proof,
0
0,
domain
));
}
#[test]
fn test_verify() {
let encoder = &ENCODER;
let data = rand_data(8);
let data = rand_data(32);
let domain_size = 16usize;
let mut rng = thread_rng();
let sks: Vec<SecretKey> = (0..16)
.map(|_| {
@ -217,6 +237,7 @@ mod test {
.collect();
let encoded_data = encoder.encode(&data).unwrap();
for (i, column) in encoded_data.extended_data.columns().enumerate() {
println!("{i}");
let verifier = &verifiers[i];
let da_blob = DaBlob {
column,
@ -230,7 +251,7 @@ mod test {
.map(|proofs| proofs.get(i).cloned().unwrap())
.collect(),
};
assert!(verifier.verify(da_blob).is_some());
assert!(verifier.verify(da_blob, domain_size).is_some());
}
}
}

24
nomos-da/kzgrs/src/rs.rs
View File

@ -1,9 +1,7 @@
use ark_bls12_381::Fr;
use ark_ff::{BigInteger, Field, PrimeField};
use ark_poly::univariate::DensePolynomial;
use ark_poly::{
DenseUVPolynomial, EvaluationDomain, Evaluations, GeneralEvaluationDomain, Polynomial,
};
use ark_poly::{DenseUVPolynomial, EvaluationDomain, Evaluations, GeneralEvaluationDomain};
use num_traits::Zero;
use std::ops::{Mul, Neg};
@ -12,17 +10,9 @@ use std::ops::{Mul, Neg};
/// `factor` need to be `>1`
pub fn encode(
polynomial: &DensePolynomial<Fr>,
evaluations: &Evaluations<Fr>,
factor: usize,
domain: GeneralEvaluationDomain<Fr>,
) -> Evaluations<Fr> {
assert!(factor > 1);
Evaluations::from_vec_and_domain(
(0..evaluations.evals.len() * factor)
.map(|i| polynomial.evaluate(&domain.element(i)))
.collect(),
domain,
)
Evaluations::from_vec_and_domain(domain.fft(&polynomial.coeffs), domain)
}
/// Interpolate points into a polynomial, then evaluate the polynomial in the original evaluations
@ -40,8 +30,10 @@ pub fn decode(
.unzip();
let coeffs = lagrange_interpolate(&points, &roots_of_unity);
Evaluations::from_vec_and_domain(
(0..original_chunks_len)
.map(|i| coeffs.evaluate(&domain.element(i)))
domain
.fft(&coeffs)
.into_iter()
.take(original_chunks_len)
.collect(),
domain,
)
@ -105,9 +97,9 @@ mod test {
let mut rng = thread_rng();
bytes.try_fill(&mut rng).unwrap();
let (evals, poly) = bytes_to_polynomial::<31>(&bytes, *DOMAIN).unwrap();
let (_evals, poly) = bytes_to_polynomial::<31>(&bytes, *DOMAIN).unwrap();
let encoded = encode(&poly, &evals, 2, *DOMAIN);
let encoded = encode(&poly, *DOMAIN);
let mut encoded: Vec<Option<Fr>> = encoded.evals.into_iter().map(Some).collect();
let decoded = decode(10, &encoded, *DOMAIN);

5
nomos-services/data-availability/verifier/src/backend/kzgrs.rs
View File

@ -45,7 +45,10 @@ impl DaVerifier for KzgrsDaVerifier {
fn verify(&self, blob: &Self::DaBlob) -> Result<Self::Attestation, Self::Error> {
let blob = blob.clone();
match self.verifier.verify(blob) {
// TODO: Prepare the domain depending the size, if fixed, so fixed domain, if not it needs
// to come with some metadata.
let domain_size = 2usize;
match self.verifier.verify(blob, domain_size) {
Some(attestation) => Ok(attestation),
None => Err(KzgrsDaVerifierError::VerificationError),
}