Mara Mihali
1 year ago
26 changed files with 1151 additions and 535 deletions
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+2 -0.gitignore
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+17 -2Cargo.toml
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+2 -2README.md
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+94 -47benches/nizk.rs
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+68 -0benches/r1cs.rs
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+2 -6benches/snark.rs
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+2 -8examples/cubic.rs
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+4 -5profiler/nizk.rs
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+6 -10src/commitments.rs
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+440 -0src/constraints.rs
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+1 -0src/dense_mlpoly.rs
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+1 -1src/errors.rs
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+1 -2src/group.rs
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+90 -59src/lib.rs
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+1 -4src/nizk/bullet.rs
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+3 -10src/nizk/mod.rs
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+142 -225src/parameters.rs
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+75 -0src/poseidon_transcript.rs
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+0 -1src/product_tree.rs
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+11 -2src/r1csinstance.rs
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+134 -98src/r1csproof.rs
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+2 -2src/random.rs
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+19 -14src/sparse_mlpoly.rs
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+24 -30src/sumcheck.rs
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+3 -3src/transcript.rs
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+7 -4src/unipoly.rs
@ -0,0 +1,68 @@ |
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use std::time::Instant;
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use libspartan::{
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parameters::POSEIDON_PARAMETERS_FR_377, poseidon_transcript::PoseidonTranscript, Instance, NIZK,
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};
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use serde::Serialize;
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#[derive(Default, Clone, Serialize)]
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struct BenchmarkResults {
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power: usize,
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input_constraints: usize,
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spartan_verifier_circuit_constraints: usize,
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r1cs_instance_generation_time: u128,
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spartan_proving_time: u128,
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groth16_setup_time: u128,
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groth16_proving_time: u128,
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groth16_verification_time: u128,
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testudo_proving_time: u128,
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}
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fn main() {
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let mut writer = csv::Writer::from_path("testudo.csv").expect("unable to open csv writer");
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for &s in [
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10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
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]
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.iter()
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{
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println!("Running for {} inputs", s);
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let mut br = BenchmarkResults::default();
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let num_vars = (2_usize).pow(s as u32);
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let num_cons = num_vars;
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br.power = s;
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br.input_constraints = num_cons;
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let num_inputs = 10;
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let start = Instant::now();
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let (inst, vars, inputs) = Instance::produce_synthetic_r1cs(num_cons, num_vars, num_inputs);
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let duration = start.elapsed().as_millis();
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br.r1cs_instance_generation_time = duration;
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let mut prover_transcript = PoseidonTranscript::new(&POSEIDON_PARAMETERS_FR_377);
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let start = Instant::now();
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let proof = NIZK::prove(&inst, vars, &inputs, &mut prover_transcript);
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let duration = start.elapsed().as_millis();
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println!("{:?}", duration);
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br.spartan_proving_time = duration;
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let mut verifier_transcript = PoseidonTranscript::new(&POSEIDON_PARAMETERS_FR_377);
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let res = proof.verify(&inst, &inputs, &mut verifier_transcript);
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assert!(res.is_ok());
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br.spartan_verifier_circuit_constraints = res.unwrap();
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let mut verifier_transcript = PoseidonTranscript::new(&POSEIDON_PARAMETERS_FR_377);
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let res = proof.verify_groth16(&inst, &inputs, &mut verifier_transcript);
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assert!(res.is_ok());
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let (ds, dp, dv) = res.unwrap();
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br.groth16_setup_time = ds;
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br.groth16_proving_time = dp;
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br.groth16_verification_time = dv;
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br.testudo_proving_time = br.spartan_proving_time + br.groth16_proving_time;
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writer
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.serialize(br)
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.expect("unable to write results to csv");
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writer.flush().expect("wasn't able to flush");
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}
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}
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@ -0,0 +1,440 @@ |
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use std::{borrow::Borrow, vec};
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use super::scalar::Scalar;
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use crate::{
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group::Fq,
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math::Math,
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sparse_mlpoly::{SparsePolyEntry, SparsePolynomial},
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unipoly::UniPoly,
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};
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use ark_bls12_377::{constraints::PairingVar as IV, Bls12_377 as I, Fr};
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use ark_crypto_primitives::{
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snark::BooleanInputVar, CircuitSpecificSetupSNARK, SNARKGadget, SNARK,
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};
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use ark_ff::{BitIteratorLE, PrimeField, Zero};
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use ark_groth16::{
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constraints::{Groth16VerifierGadget, PreparedVerifyingKeyVar, ProofVar},
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Groth16, PreparedVerifyingKey, Proof as GrothProof,
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};
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use ark_r1cs_std::{
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alloc::{AllocVar, AllocationMode},
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fields::fp::FpVar,
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prelude::{Boolean, EqGadget, FieldVar},
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};
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use ark_relations::r1cs::{ConstraintSynthesizer, ConstraintSystemRef, Namespace, SynthesisError};
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use ark_sponge::{
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constraints::CryptographicSpongeVar,
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poseidon::{constraints::PoseidonSpongeVar, PoseidonParameters},
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};
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use rand::{CryptoRng, Rng};
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pub struct PoseidonTranscripVar {
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pub cs: ConstraintSystemRef<Fr>,
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pub sponge: PoseidonSpongeVar<Fr>,
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pub params: PoseidonParameters<Fr>,
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}
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impl PoseidonTranscripVar {
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fn new(
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cs: ConstraintSystemRef<Fr>,
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params: &PoseidonParameters<Fr>,
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challenge: Option<Fr>,
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) -> Self {
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let mut sponge = PoseidonSpongeVar::new(cs.clone(), params);
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if let Some(c) = challenge {
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let c_var = FpVar::<Fr>::new_witness(cs.clone(), || Ok(c)).unwrap();
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sponge.absorb(&c_var);
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}
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Self {
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cs: cs,
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sponge: sponge,
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params: params.clone(),
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}
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}
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fn append(&mut self, input: &FpVar<Fr>) -> Result<(), SynthesisError> {
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self.sponge.absorb(&input)
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}
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fn append_vector(&mut self, input_vec: &Vec<FpVar<Fr>>) -> Result<(), SynthesisError> {
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for input in input_vec.iter() {
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self.append(input)?;
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}
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Ok(())
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}
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fn challenge(&mut self) -> Result<FpVar<Fr>, SynthesisError> {
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let c_var = self.sponge.squeeze_field_elements(1).unwrap().remove(0);
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Ok(c_var)
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}
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fn challenge_vector(&mut self, len: usize) -> Result<Vec<FpVar<Fr>>, SynthesisError> {
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let c_vars = self.sponge.squeeze_field_elements(len).unwrap();
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Ok(c_vars)
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}
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}
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#[derive(Clone)]
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pub struct UniPolyVar {
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pub coeffs: Vec<FpVar<Fr>>,
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}
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impl AllocVar<UniPoly, Fr> for UniPolyVar {
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fn new_variable<T: Borrow<UniPoly>>(
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cs: impl Into<Namespace<Fr>>,
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f: impl FnOnce() -> Result<T, SynthesisError>,
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mode: AllocationMode,
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) -> Result<Self, SynthesisError> {
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f().and_then(|c| {
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let cs = cs.into();
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let cp: &UniPoly = c.borrow();
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let mut coeffs_var = Vec::new();
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for coeff in cp.coeffs.iter() {
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let coeff_var = FpVar::<Fr>::new_variable(cs.clone(), || Ok(coeff.clone()), mode)?;
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coeffs_var.push(coeff_var);
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}
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Ok(Self { coeffs: coeffs_var })
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})
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}
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}
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impl UniPolyVar {
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pub fn eval_at_zero(&self) -> FpVar<Fr> {
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self.coeffs[0].clone()
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}
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pub fn eval_at_one(&self) -> FpVar<Fr> {
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let mut res = self.coeffs[0].clone();
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for i in 1..self.coeffs.len() {
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res = &res + &self.coeffs[i];
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}
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res
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}
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// mul without reduce
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pub fn evaluate(&self, r: &FpVar<Fr>) -> FpVar<Fr> {
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let mut eval = self.coeffs[0].clone();
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let mut power = r.clone();
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for i in 1..self.coeffs.len() {
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eval += &power * &self.coeffs[i];
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power *= r;
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}
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eval
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}
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}
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#[derive(Clone)]
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pub struct SumcheckVerificationCircuit {
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pub polys: Vec<UniPoly>,
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}
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impl SumcheckVerificationCircuit {
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fn verifiy_sumcheck(
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&self,
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poly_vars: &Vec<UniPolyVar>,
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claim_var: &FpVar<Fr>,
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transcript_var: &mut PoseidonTranscripVar,
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) -> Result<(FpVar<Fr>, Vec<FpVar<Fr>>), SynthesisError> {
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let mut e_var = claim_var.clone();
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let mut r_vars: Vec<FpVar<Fr>> = Vec::new();
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for (poly_var, _poly) in poly_vars.iter().zip(self.polys.iter()) {
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let res = poly_var.eval_at_one() + poly_var.eval_at_zero();
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res.enforce_equal(&e_var)?;
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transcript_var.append_vector(&poly_var.coeffs)?;
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let r_i_var = transcript_var.challenge()?;
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r_vars.push(r_i_var.clone());
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e_var = poly_var.evaluate(&r_i_var.clone());
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}
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Ok((e_var, r_vars))
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}
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}
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#[derive(Clone)]
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pub struct SparsePolyEntryVar {
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idx: usize,
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val_var: FpVar<Fr>,
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}
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impl AllocVar<SparsePolyEntry, Fr> for SparsePolyEntryVar {
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fn new_variable<T: Borrow<SparsePolyEntry>>(
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cs: impl Into<Namespace<Fr>>,
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f: impl FnOnce() -> Result<T, SynthesisError>,
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_mode: AllocationMode,
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) -> Result<Self, SynthesisError> {
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f().and_then(|s| {
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let cs = cs.into();
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let spe: &SparsePolyEntry = s.borrow();
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let val_var = FpVar::<Fr>::new_witness(cs.clone(), || Ok(spe.val))?;
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Ok(Self {
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idx: spe.idx,
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val_var,
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})
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})
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}
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}
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#[derive(Clone)]
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pub struct SparsePolynomialVar {
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num_vars: usize,
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Z_var: Vec<SparsePolyEntryVar>,
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}
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impl AllocVar<SparsePolynomial, Fr> for SparsePolynomialVar {
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fn new_variable<T: Borrow<SparsePolynomial>>(
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cs: impl Into<Namespace<Fr>>,
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f: impl FnOnce() -> Result<T, SynthesisError>,
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mode: AllocationMode,
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) -> Result<Self, SynthesisError> {
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f().and_then(|s| {
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let cs = cs.into();
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let sp: &SparsePolynomial = s.borrow();
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let mut Z_var = Vec::new();
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for spe in sp.Z.iter() {
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let spe_var = SparsePolyEntryVar::new_variable(cs.clone(), || Ok(spe), mode)?;
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Z_var.push(spe_var);
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}
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Ok(Self {
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num_vars: sp.num_vars,
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Z_var,
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})
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})
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}
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}
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impl SparsePolynomialVar {
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fn compute_chi(a: &[bool], r_vars: &Vec<FpVar<Fr>>) -> FpVar<Fr> {
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let mut chi_i_var = FpVar::<Fr>::one();
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let one = FpVar::<Fr>::one();
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for (i, r_var) in r_vars.iter().enumerate() {
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if a[i] {
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chi_i_var *= r_var;
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} else {
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chi_i_var *= &one - r_var;
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}
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}
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chi_i_var
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}
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pub fn evaluate(&self, r_var: &Vec<FpVar<Fr>>) -> FpVar<Fr> {
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let mut sum = FpVar::<Fr>::zero();
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for spe_var in self.Z_var.iter() {
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// potential problem
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let bits = &spe_var.idx.get_bits(r_var.len());
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sum += SparsePolynomialVar::compute_chi(&bits, r_var) * &spe_var.val_var;
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}
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sum
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}
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}
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#[derive(Clone)]
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pub struct R1CSVerificationCircuit {
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pub num_vars: usize,
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pub num_cons: usize,
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pub input: Vec<Fr>,
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pub input_as_sparse_poly: SparsePolynomial,
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pub evals: (Fr, Fr, Fr),
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pub params: PoseidonParameters<Fr>,
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pub prev_challenge: Fr,
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pub claims_phase2: (Scalar, Scalar, Scalar, Scalar),
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pub eval_vars_at_ry: Fr,
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pub sc_phase1: SumcheckVerificationCircuit,
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pub sc_phase2: SumcheckVerificationCircuit,
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}
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impl R1CSVerificationCircuit {
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fn new(config: &VerifierConfig) -> Self {
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Self {
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num_vars: config.num_vars,
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num_cons: config.num_cons,
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input: config.input.clone(),
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input_as_sparse_poly: config.input_as_sparse_poly.clone(),
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evals: config.evals,
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params: config.params.clone(),
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prev_challenge: config.prev_challenge,
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claims_phase2: config.claims_phase2,
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eval_vars_at_ry: config.eval_vars_at_ry,
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sc_phase1: SumcheckVerificationCircuit {
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polys: config.polys_sc1.clone(),
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},
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sc_phase2: SumcheckVerificationCircuit {
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polys: config.polys_sc2.clone(),
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},
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}
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}
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}
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impl ConstraintSynthesizer<Fr> for R1CSVerificationCircuit {
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fn generate_constraints(self, cs: ConstraintSystemRef<Fr>) -> ark_relations::r1cs::Result<()> {
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let mut transcript_var =
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PoseidonTranscripVar::new(cs.clone(), &self.params, Some(self.prev_challenge));
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let poly_sc1_vars = self
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.sc_phase1
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.polys
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.iter()
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.map(|p| UniPolyVar::new_variable(cs.clone(), || Ok(p), AllocationMode::Witness).unwrap())
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.collect::<Vec<UniPolyVar>>();
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let poly_sc2_vars = self
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.sc_phase2
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.polys
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.iter()
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.map(|p| UniPolyVar::new_variable(cs.clone(), || Ok(p), AllocationMode::Witness).unwrap())
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.collect::<Vec<UniPolyVar>>();
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let input_vars = self
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.input
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.iter()
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.map(|i| FpVar::<Fr>::new_input(cs.clone(), || Ok(i)).unwrap())
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.collect::<Vec<FpVar<Fr>>>();
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transcript_var.append_vector(&input_vars)?;
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let num_rounds_x = self.num_cons.log_2();
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let _num_rounds_y = (2 * self.num_vars).log_2();
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let tau_vars = transcript_var.challenge_vector(num_rounds_x)?;
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let claim_phase1_var = FpVar::<Fr>::new_witness(cs.clone(), || Ok(Fr::zero()))?;
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let (claim_post_phase1_var, rx_var) =
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self
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.sc_phase1
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.verifiy_sumcheck(&poly_sc1_vars, &claim_phase1_var, &mut transcript_var)?;
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let (Az_claim, Bz_claim, Cz_claim, prod_Az_Bz_claims) = &self.claims_phase2;
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let Az_claim_var = FpVar::<Fr>::new_input(cs.clone(), || Ok(Az_claim))?;
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let Bz_claim_var = FpVar::<Fr>::new_input(cs.clone(), || Ok(Bz_claim))?;
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let Cz_claim_var = FpVar::<Fr>::new_input(cs.clone(), || Ok(Cz_claim))?;
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let prod_Az_Bz_claim_var = FpVar::<Fr>::new_input(cs.clone(), || Ok(prod_Az_Bz_claims))?;
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let one = FpVar::<Fr>::one();
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let prod_vars: Vec<FpVar<Fr>> = (0..rx_var.len())
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.map(|i| (&rx_var[i] * &tau_vars[i]) + (&one - &rx_var[i]) * (&one - &tau_vars[i]))
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.collect();
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let mut taus_bound_rx_var = FpVar::<Fr>::one();
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|
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for p_var in prod_vars.iter() {
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taus_bound_rx_var *= p_var;
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}
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let expected_claim_post_phase1_var =
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(&prod_Az_Bz_claim_var - &Cz_claim_var) * &taus_bound_rx_var;
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claim_post_phase1_var.enforce_equal(&expected_claim_post_phase1_var)?;
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let r_A_var = transcript_var.challenge()?;
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let r_B_var = transcript_var.challenge()?;
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let r_C_var = transcript_var.challenge()?;
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let claim_phase2_var =
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&r_A_var * &Az_claim_var + &r_B_var * &Bz_claim_var + &r_C_var * &Cz_claim_var;
|
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|
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let (claim_post_phase2_var, ry_var) =
|
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self
|
|||
.sc_phase2
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.verifiy_sumcheck(&poly_sc2_vars, &claim_phase2_var, &mut transcript_var)?;
|
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|
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let input_as_sparse_poly_var = SparsePolynomialVar::new_variable(
|
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cs.clone(),
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|| Ok(&self.input_as_sparse_poly),
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AllocationMode::Witness,
|
|||
)?;
|
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|
|||
let poly_input_eval_var = input_as_sparse_poly_var.evaluate(&ry_var[1..].to_vec());
|
|||
|
|||
let eval_vars_at_ry_var = FpVar::<Fr>::new_input(cs.clone(), || Ok(&self.eval_vars_at_ry))?;
|
|||
|
|||
let eval_Z_at_ry_var =
|
|||
(FpVar::<Fr>::one() - &ry_var[0]) * &eval_vars_at_ry_var + &ry_var[0] * &poly_input_eval_var;
|
|||
|
|||
let (eval_A_r, eval_B_r, eval_C_r) = self.evals;
|
|||
|
|||
let eval_A_r_var = FpVar::<Fr>::new_witness(cs.clone(), || Ok(eval_A_r))?;
|
|||
let eval_B_r_var = FpVar::<Fr>::new_witness(cs.clone(), || Ok(eval_B_r))?;
|
|||
let eval_C_r_var = FpVar::<Fr>::new_witness(cs.clone(), || Ok(eval_C_r))?;
|
|||
|
|||
let scalar_var = &r_A_var * &eval_A_r_var + &r_B_var * &eval_B_r_var + &r_C_var * &eval_C_r_var;
|
|||
|
|||
let expected_claim_post_phase2_var = eval_Z_at_ry_var * scalar_var;
|
|||
|
|||
claim_post_phase2_var.enforce_equal(&expected_claim_post_phase2_var)?;
|
|||
|
|||
Ok(())
|
|||
}
|
|||
}
|
|||
|
|||
#[derive(Clone)]
|
|||
pub struct VerifierConfig {
|
|||
pub num_vars: usize,
|
|||
pub num_cons: usize,
|
|||
pub input: Vec<Fr>,
|
|||
pub input_as_sparse_poly: SparsePolynomial,
|
|||
pub evals: (Fr, Fr, Fr),
|
|||
pub params: PoseidonParameters<Fr>,
|
|||
pub prev_challenge: Fr,
|
|||
pub claims_phase2: (Fr, Fr, Fr, Fr),
|
|||
pub eval_vars_at_ry: Fr,
|
|||
pub polys_sc1: Vec<UniPoly>,
|
|||
pub polys_sc2: Vec<UniPoly>,
|
|||
}
|
|||
#[derive(Clone)]
|
|||
pub struct VerifierCircuit {
|
|||
pub inner_circuit: R1CSVerificationCircuit,
|
|||
pub inner_proof: GrothProof<I>,
|
|||
pub inner_vk: PreparedVerifyingKey<I>,
|
|||
pub evals_var_at_ry: Fr,
|
|||
pub claims_phase2: (Fr, Fr, Fr, Fr),
|
|||
pub input: Vec<Fr>,
|
|||
}
|
|||
|
|||
impl VerifierCircuit {
|
|||
pub fn new<R: Rng + CryptoRng>(
|
|||
config: &VerifierConfig,
|
|||
mut rng: &mut R,
|
|||
) -> Result<Self, SynthesisError> {
|
|||
let inner_circuit = R1CSVerificationCircuit::new(config);
|
|||
let (pk, vk) = Groth16::<I>::setup(inner_circuit.clone(), &mut rng).unwrap();
|
|||
let proof = Groth16::<I>::prove(&pk, inner_circuit.clone(), &mut rng)?;
|
|||
let pvk = Groth16::<I>::process_vk(&vk).unwrap();
|
|||
Ok(Self {
|
|||
inner_circuit: inner_circuit,
|
|||
inner_proof: proof,
|
|||
inner_vk: pvk,
|
|||
evals_var_at_ry: config.eval_vars_at_ry,
|
|||
claims_phase2: config.claims_phase2,
|
|||
input: config.input.clone(),
|
|||
})
|
|||
}
|
|||
}
|
|||
|
|||
impl ConstraintSynthesizer<Fq> for VerifierCircuit {
|
|||
fn generate_constraints(self, cs: ConstraintSystemRef<Fq>) -> ark_relations::r1cs::Result<()> {
|
|||
let proof_var = ProofVar::<I, IV>::new_witness(cs.clone(), || Ok(self.inner_proof.clone()))?;
|
|||
let (v_A, v_B, v_C, v_AB) = self.claims_phase2;
|
|||
let mut pubs = self.input.clone();
|
|||
pubs.extend(vec![v_A, v_B, v_C, v_AB, self.evals_var_at_ry]);
|
|||
let bits = pubs
|
|||
.iter()
|
|||
.map(|c| {
|
|||
let bits: Vec<bool> = BitIteratorLE::new(c.into_repr().as_ref().to_vec()).collect();
|
|||
Vec::new_witness(cs.clone(), || Ok(bits))
|
|||
})
|
|||
.collect::<Result<Vec<_>, _>>()?;
|
|||
let input_var = BooleanInputVar::<Fr, Fq>::new(bits);
|
|||
|
|||
let vk_var = PreparedVerifyingKeyVar::new_witness(cs.clone(), || Ok(self.inner_vk.clone()))?;
|
|||
Groth16VerifierGadget::verify_with_processed_vk(&vk_var, &input_var, &proof_var)?
|
|||
.enforce_equal(&Boolean::constant(true))?;
|
|||
Ok(())
|
|||
}
|
|||
}
|
|||
@ -0,0 +1,75 @@ |
|||
use crate::group::{CompressedGroup, Fr};
|
|||
|
|||
use super::scalar::Scalar;
|
|||
|
|||
// use ark_r1cs_std::prelude::*;
|
|||
use ark_sponge::{
|
|||
constraints::CryptographicSpongeVar,
|
|||
poseidon::{PoseidonParameters, PoseidonSponge},
|
|||
CryptographicSponge,
|
|||
};
|
|||
|
|||
#[derive(Clone)]
|
|||
/// TODO
|
|||
pub struct PoseidonTranscript {
|
|||
sponge: PoseidonSponge<Fr>,
|
|||
params: PoseidonParameters<Fr>,
|
|||
}
|
|||
|
|||
impl PoseidonTranscript {
|
|||
/// create a new transcript
|
|||
pub fn new(params: &PoseidonParameters<Fr>) -> Self {
|
|||
let sponge = PoseidonSponge::new(params);
|
|||
PoseidonTranscript {
|
|||
sponge: sponge,
|
|||
params: params.clone(),
|
|||
}
|
|||
}
|
|||
|
|||
pub fn new_from_state(&mut self, challenge: &Scalar) {
|
|||
self.sponge = PoseidonSponge::new(&self.params);
|
|||
self.append_scalar(&challenge);
|
|||
}
|
|||
|
|||
pub fn append_u64(&mut self, x: u64) {
|
|||
self.sponge.absorb(&x);
|
|||
}
|
|||
|
|||
pub fn append_bytes(&mut self, x: &Vec<u8>) {
|
|||
self.sponge.absorb(x);
|
|||
}
|
|||
|
|||
pub fn append_scalar(&mut self, scalar: &Scalar) {
|
|||
self.sponge.absorb(&scalar);
|
|||
}
|
|||
|
|||
pub fn append_point(&mut self, point: &CompressedGroup) {
|
|||
self.sponge.absorb(&point.0);
|
|||
}
|
|||
|
|||
pub fn append_scalar_vector(&mut self, scalars: &Vec<Scalar>) {
|
|||
for scalar in scalars.iter() {
|
|||
self.append_scalar(&scalar);
|
|||
}
|
|||
}
|
|||
|
|||
pub fn challenge_scalar(&mut self) -> Scalar {
|
|||
let scalar = self.sponge.squeeze_field_elements(1).remove(0);
|
|||
scalar
|
|||
}
|
|||
|
|||
pub fn challenge_vector(&mut self, len: usize) -> Vec<Scalar> {
|
|||
let challenges = self.sponge.squeeze_field_elements(len);
|
|||
challenges
|
|||
}
|
|||
}
|
|||
|
|||
pub trait AppendToPoseidon {
|
|||
fn append_to_poseidon(&self, transcript: &mut PoseidonTranscript);
|
|||
}
|
|||
|
|||
impl AppendToPoseidon for CompressedGroup {
|
|||
fn append_to_poseidon(&self, transcript: &mut PoseidonTranscript) {
|
|||
transcript.append_point(self);
|
|||
}
|
|||
}
|
|||