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Implement rs encode/decode

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This commit is contained in:
Daniel Sanchez Quiros 2024-04-02 17:35:25 +02:00
parent a8ef541cdb
commit 4baae88a1c
2 changed files with 34 additions and 2 deletions
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2
nomos-da/kzgrs/src/common.rs
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@ -5,8 +5,6 @@ use ark_ff::{BigInteger256, PrimeField, Zero};
use ark_poly::domain::general::GeneralEvaluationDomain;
use ark_poly::evaluations::univariate::Evaluations;
use ark_poly::univariate::DensePolynomial;
use num_bigint;
use num_traits::ops::bytes::FromBytes;
use thiserror::Error;
// internal

34
nomos-da/kzgrs/src/rs.rs
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@ -0,0 +1,34 @@
use ark_bls12_381::Fr;
use ark_poly::univariate::DensePolynomial;
use ark_poly::{EvaluationDomain, Evaluations, GeneralEvaluationDomain, Polynomial};
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,
)
}
pub fn decode(
original_chunks_len: usize,
points: &[Fr],
domain: &GeneralEvaluationDomain<Fr>,
) -> Evaluations<Fr> {
let evals = Evaluations::<Fr>::from_vec_and_domain(points.to_vec(), *domain);
let coeffs = evals.interpolate();
Evaluations::from_vec_and_domain(
(0..original_chunks_len)
.map(|i| coeffs.evaluate(&domain.element(i)))
.collect(),
*domain,
)
}