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Use interpolate2 in the FRI verifier

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This commit is contained in:
wborgeaud 2021-06-18 11:16:22 +02:00
parent 4f8ef2e178
commit 5a8d951590
1 changed files with 14 additions and 11 deletions
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25
src/fri/verifier.rs
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@ -2,7 +2,7 @@ use anyhow::{ensure, Result};
use crate::field::extension_field::{flatten, Extendable, FieldExtension, Frobenius};
use crate::field::field::Field;
use crate::field::lagrange::{barycentric_weights, interpolant, interpolate};
use crate::field::lagrange::{barycentric_weights, interpolant, interpolate, interpolate2};
use crate::fri::FriConfig;
use crate::hash::hash_n_to_1;
use crate::merkle_proofs::verify_merkle_proof;
@ -185,14 +185,17 @@ fn fri_combine_initial<F: Field + Extendable<D>, const D: usize>(
.map(|&e| F::Extension::from_basefield(e));
let zs_composition_eval = reduce_with_iter(zs_evals, alpha_powers.clone());
let zeta_right = F::Extension::primitive_root_of_unity(degree_log) * zeta;
let zs_interpol = interpolant(&[
(zeta, reduce_with_iter(&os.plonk_zs, alpha_powers.clone())),
(
zeta_right,
reduce_with_iter(&os.plonk_zs_right, &mut alpha_powers),
),
]);
let zs_numerator = zs_composition_eval - zs_interpol.eval(subgroup_x);
let zs_interpol = interpolate2(
[
(zeta, reduce_with_iter(&os.plonk_zs, alpha_powers.clone())),
(
zeta_right,
reduce_with_iter(&os.plonk_zs_right, &mut alpha_powers),
),
],
subgroup_x,
);
let zs_numerator = zs_composition_eval - zs_interpol;
let zs_denominator = (subgroup_x - zeta) * (subgroup_x - zeta_right);
sum += zs_numerator / zs_denominator;
@ -211,8 +214,8 @@ fn fri_combine_initial<F: Field + Extendable<D>, const D: usize>(
// and one call at the end of the sum.
let alpha_powers_frob = alpha_powers.repeated_frobenius(D - 1);
let wire_eval_frob = reduce_with_iter(&os.wires, alpha_powers_frob).frobenius();
let wire_interpol = interpolant(&[(zeta, wire_eval), (zeta_frob, wire_eval_frob)]);
let wire_numerator = wire_composition_eval - wire_interpol.eval(subgroup_x);
let wire_interpol = interpolate2([(zeta, wire_eval), (zeta_frob, wire_eval_frob)], subgroup_x);
let wire_numerator = wire_composition_eval - wire_interpol;
let wire_denominator = (subgroup_x - zeta) * (subgroup_x - zeta_frob);
sum += wire_numerator / wire_denominator;