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use snarkvm_curves::PairingEngine;
use snarkvm_gadgets::{fields::FpGadget, traits::curves::PairingGadget};
use snarkvm_r1cs::{ConstraintSystem, SynthesisError, ToConstraintField};
use crate::{
marlin_pc::{LabeledCommitmentVar, PreparedCommitmentVar},
PrepareGadget,
String,
};
pub struct PreparedLabeledCommitmentVar<
TargetCurve: PairingEngine,
BaseCurve: PairingEngine,
PG: PairingGadget<TargetCurve, <BaseCurve as PairingEngine>::Fr>,
> where
<TargetCurve as PairingEngine>::G1Affine: ToConstraintField<<BaseCurve as PairingEngine>::Fr>,
<TargetCurve as PairingEngine>::G2Affine: ToConstraintField<<BaseCurve as PairingEngine>::Fr>,
{
pub label: String,
pub prepared_commitment: PreparedCommitmentVar<TargetCurve, BaseCurve, PG>,
pub degree_bound: Option<FpGadget<<BaseCurve as PairingEngine>::Fr>>,
}
impl<TargetCurve, BaseCurve, PG> Clone for PreparedLabeledCommitmentVar<TargetCurve, BaseCurve, PG>
where
TargetCurve: PairingEngine,
BaseCurve: PairingEngine,
PG: PairingGadget<TargetCurve, <BaseCurve as PairingEngine>::Fr>,
<TargetCurve as PairingEngine>::G1Affine: ToConstraintField<<BaseCurve as PairingEngine>::Fr>,
<TargetCurve as PairingEngine>::G2Affine: ToConstraintField<<BaseCurve as PairingEngine>::Fr>,
{
fn clone(&self) -> Self {
Self {
label: self.label.clone(),
prepared_commitment: self.prepared_commitment.clone(),
degree_bound: self.degree_bound.clone(),
}
}
}
impl<TargetCurve, BaseCurve, PG>
PrepareGadget<LabeledCommitmentVar<TargetCurve, BaseCurve, PG>, <BaseCurve as PairingEngine>::Fr>
for PreparedLabeledCommitmentVar<TargetCurve, BaseCurve, PG>
where
TargetCurve: PairingEngine,
BaseCurve: PairingEngine,
PG: PairingGadget<TargetCurve, <BaseCurve as PairingEngine>::Fr>,
<TargetCurve as PairingEngine>::G1Affine: ToConstraintField<<BaseCurve as PairingEngine>::Fr>,
<TargetCurve as PairingEngine>::G2Affine: ToConstraintField<<BaseCurve as PairingEngine>::Fr>,
{
fn prepare<CS: ConstraintSystem<<BaseCurve as PairingEngine>::Fr>>(
cs: CS,
unprepared: &LabeledCommitmentVar<TargetCurve, BaseCurve, PG>,
) -> Result<Self, SynthesisError> {
Ok(Self {
label: unprepared.label.clone(),
prepared_commitment: PreparedCommitmentVar::prepare(cs, &unprepared.commitment)?,
degree_bound: unprepared.degree_bound.clone(),
})
}
}
#[cfg(test)]
mod tests {
use snarkvm_algorithms::fft::DensePolynomial;
use snarkvm_curves::{
bls12_377::{Bls12_377, Fq, Fr},
bw6_761::BW6_761,
AffineCurve,
};
use snarkvm_gadgets::{
curves::bls12_377::PairingGadget as Bls12_377PairingGadget,
traits::{alloc::AllocGadget, eq::EqGadget},
};
use snarkvm_r1cs::TestConstraintSystem;
use snarkvm_utilities::rand::test_rng;
use crate::{
marlin_pc::{MarlinKZG10, PreparedCommitment},
LabeledPolynomial,
PCPreparedCommitment,
PolynomialCommitment,
ToString,
};
use super::*;
type PC = MarlinKZG10<Bls12_377>;
type PG = Bls12_377PairingGadget;
type BaseCurve = BW6_761;
const MAX_DEGREE: usize = 383;
const SUPPORTED_DEGREE: usize = 300;
const SUPPORTED_HIDING_BOUND: usize = 1;
#[test]
fn test_prepare() {
let rng = &mut test_rng();
let cs = &mut TestConstraintSystem::<Fq>::new();
let pp = PC::setup(MAX_DEGREE, rng).unwrap();
let (committer_key, _vk) = PC::trim(&pp, SUPPORTED_DEGREE, SUPPORTED_HIDING_BOUND, None).unwrap();
let random_polynomial = DensePolynomial::<Fr>::rand(SUPPORTED_DEGREE - 1, rng);
let labeled_polynomial = LabeledPolynomial::new("test_polynomial".to_string(), random_polynomial, None, None);
let (commitments, _randomness) = PC::commit(&committer_key, vec![&labeled_polynomial], Some(rng)).unwrap();
for (i, commitment) in commitments.iter().enumerate() {
let prepared_commitment = PreparedCommitment::prepare(&commitment.commitment());
let commitment_gadget =
LabeledCommitmentVar::<_, BaseCurve, PG>::alloc(cs.ns(|| format!("commitment_{}", i)), || {
Ok(commitment)
})
.unwrap();
let prepared_commitment_gadget = PreparedLabeledCommitmentVar::prepare(
cs.ns(|| format!("prepare_commitment_{}", i)),
&commitment_gadget,
)
.unwrap();
for (j, (comm_element, comm_element_gadget)) in prepared_commitment
.prepared_comm
.0
.iter()
.zip(prepared_commitment_gadget.prepared_commitment.prepared_comm)
.enumerate()
{
let expected_commitment_gadget = <PG as PairingGadget<_, _>>::G1Gadget::alloc(
cs.ns(|| format!("prepared_commitment_{}_{}", i, j)),
|| Ok(comm_element.into_projective()),
)
.unwrap();
comm_element_gadget
.enforce_equal(
cs.ns(|| format!("commitment_conditional_enforce_equal_{}_{}", i, j)),
&expected_commitment_gadget,
)
.unwrap();
}
assert_eq!(
prepared_commitment.shifted_comm.is_some(),
prepared_commitment_gadget.prepared_commitment.shifted_comm.is_some()
);
if let (Some(shifted_comm), Some(shifted_comm_gadget)) = (
&prepared_commitment.shifted_comm,
prepared_commitment_gadget.prepared_commitment.shifted_comm,
) {
let expected_shifted_commitment_gadget = <PG as PairingGadget<_, _>>::G1Gadget::alloc(
cs.ns(|| format!("shifted_commitment_gadget_{}", i)),
|| Ok(shifted_comm.0.into_projective()),
)
.unwrap();
shifted_comm_gadget
.enforce_equal(
cs.ns(|| format!("shifted_commitment_conditional_enforce_equal_{}", i)),
&expected_shifted_commitment_gadget,
)
.unwrap();
}
assert!(cs.is_satisfied());
}
}
}