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remove identity polynomial commitments and PCS evaluations (#104)

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* remove sid pcs evals

* minor optimization + more timers
This commit is contained in:
chancharles92
2022-12-06 09:43:01 -05:00
committed by GitHub
parent 94092ca6a4
commit 366a2674bc
3 changed files with 45 additions and 40 deletions
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13
subroutines/src/pcs/multilinear_kzg/batching.rs
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@@ -14,7 +14,8 @@ use crate::{
IOPProof,
};
use arithmetic::{build_eq_x_r_vec, DenseMultilinearExtension, VPAuxInfo, VirtualPolynomial};
use ark_ec::{AffineCurve, PairingEngine, ProjectiveCurve};
use ark_ec::{msm::VariableBaseMSM, PairingEngine, ProjectiveCurve};
use ark_ff::PrimeField;
use ark_std::{end_timer, log2, start_timer, One, Zero};
use std::{marker::PhantomData, rc::Rc};
use transcript::IOPTranscript;
@@ -189,15 +190,19 @@ where
let a2 = &proof.sum_check_proof.point[..num_var];
// build g' commitment
let step = start_timer!(|| "build homomorphic commitment");
let eq_t_list = build_eq_x_r_vec(t.as_ref())?;
let mut g_prime_commit = E::G1Affine::zero().into_projective();
let mut scalars = vec![];
let mut bases = vec![];
for (i, point) in points.iter().enumerate() {
let eq_i_a2 = eq_eval(a2, point)?;
let tmp = eq_i_a2 * eq_t_list[i];
g_prime_commit += &f_i_commitments[i].0.mul(tmp);
scalars.push((eq_i_a2 * eq_t_list[i]).into_repr());
bases.push(f_i_commitments[i].0);
}
let g_prime_commit = VariableBaseMSM::multi_scalar_mul(&bases, &scalars);
end_timer!(step);
// ensure \sum_i eq(t, <i>) * f_i_evals matches the sum via SumCheck
let mut sum = E::Fr::zero();