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pad two IPA instances to the same size when folding (#103)

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This commit is contained in:
Srinath Setty
2022-07-27 22:21:47 -07:00
committed by GitHub
parent a56f823ace
commit c7e8782f11
1 changed files with 27 additions and 1 deletions
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28
src/spartan_with_ipa_pc/ipa.rs
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@@ -2,7 +2,7 @@
use crate::commitments::{CommitGens, CommitTrait, Commitment, CompressedCommitment};
use crate::errors::NovaError;
use crate::traits::{AppendToTranscriptTrait, ChallengeTrait, Group};
use core::iter;
use core::{cmp::max, iter};
use ff::Field;
use merlin::Transcript;
use rayon::prelude::*;
@@ -35,6 +35,16 @@ impl<G: Group> InnerProductInstance<G> {
c: *c,
}
}
pub fn pad(&self, n: usize) -> InnerProductInstance<G> {
let mut b_vec = self.b_vec.clone();
b_vec.resize(n, G::Scalar::zero());
InnerProductInstance {
comm_a_vec: self.comm_a_vec,
b_vec,
c: self.c,
}
}
}
pub struct InnerProductWitness<G: Group> {
@@ -47,6 +57,12 @@ impl<G: Group> InnerProductWitness<G> {
a_vec: a_vec.to_vec(),
}
}
pub fn pad(&self, n: usize) -> InnerProductWitness<G> {
let mut a_vec = self.a_vec.clone();
a_vec.resize(n, G::Scalar::zero());
InnerProductWitness { a_vec }
}
}
/// A non-interactive folding scheme (NIFS) for inner product relations
@@ -68,6 +84,12 @@ impl<G: Group> NIFSForInnerProduct<G> {
) -> (Self, InnerProductInstance<G>, InnerProductWitness<G>) {
transcript.append_message(b"protocol-name", Self::protocol_name());
// pad the instances and witness so they are of the same length
let U1 = U1.pad(max(U1.b_vec.len(), U2.b_vec.len()));
let U2 = U2.pad(max(U1.b_vec.len(), U2.b_vec.len()));
let W1 = W1.pad(max(U1.b_vec.len(), U2.b_vec.len()));
let W2 = W2.pad(max(U1.b_vec.len(), U2.b_vec.len()));
// add the two commitments and two public vectors to the transcript
U1.comm_a_vec
.append_to_transcript(b"U1_comm_a_vec", transcript);
@@ -120,6 +142,10 @@ impl<G: Group> NIFSForInnerProduct<G> {
) -> InnerProductInstance<G> {
transcript.append_message(b"protocol-name", Self::protocol_name());
// pad the instances so they are of the same length
let U1 = U1.pad(max(U1.b_vec.len(), U2.b_vec.len()));
let U2 = U2.pad(max(U1.b_vec.len(), U2.b_vec.len()));
// add the two commitments and two public vectors to the transcript
U1.comm_a_vec
.append_to_transcript(b"U1_comm_a_vec", transcript);