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use ark_circom::{ethereum, CircomBuilder, CircomConfig};
use ark_std::rand::thread_rng;
use color_eyre::Result;
use ark_bn254::Bn254;
use ark_groth16::{create_random_proof as prove, generate_random_parameters};
use ethers::{
contract::ContractError,
prelude::abigen,
providers::{Http, Middleware, Provider},
utils::Anvil,
};
use std::{convert::TryFrom, sync::Arc};
#[tokio::test]
async fn solidity_verifier() -> Result<()> {
let cfg = CircomConfig::<Bn254>::new(
"./test-vectors/mycircuit.wasm",
"./test-vectors/mycircuit.r1cs",
)?;
let mut builder = CircomBuilder::new(cfg);
builder.push_input("a", 3);
builder.push_input("b", 11);
// create an empty instance for setting it up
let circom = builder.setup();
let mut rng = thread_rng();
let params = generate_random_parameters::<Bn254, _, _>(circom, &mut rng)?;
let circom = builder.build()?;
let inputs = circom.get_public_inputs().unwrap();
let proof = prove(circom, &params, &mut rng)?;
// launch the network & compile the verifier
let anvil = Anvil::new().spawn();
let acc = anvil.addresses()[0];
let provider = Provider::<Http>::try_from(anvil.endpoint())?;
let provider = provider.with_sender(acc);
let provider = Arc::new(provider);
// deploy the verifier
let contract = Groth16Verifier::deploy(provider.clone(), ())?
.send()
.await?;
// check the proof
let verified = contract
.check_proof(proof, params.vk, inputs.as_slice())
.await?;
assert!(verified);
Ok(())
}
// We need to implement the conversion from the Ark-Circom's internal Ethereum types to
// the ones expected by the abigen'd types. Could we maybe provide a convenience
// macro for these, given that there's room for implementation error?
abigen!(Groth16Verifier, "./tests/verifier_artifact.json");
use groth_16_verifier::{G1Point, G2Point, Proof, VerifyingKey};
impl From<ethereum::G1> for G1Point {
fn from(src: ethereum::G1) -> Self {
Self { x: src.x, y: src.y }
}
}
impl From<ethereum::G2> for G2Point {
fn from(src: ethereum::G2) -> Self {
// We should use the `.as_tuple()` method which handles converting
// the G2 elements to have the second limb first
let src = src.as_tuple();
Self { x: src.0, y: src.1 }
}
}
impl From<ethereum::Proof> for Proof {
fn from(src: ethereum::Proof) -> Self {
Self {
a: src.a.into(),
b: src.b.into(),
c: src.c.into(),
}
}
}
impl From<ethereum::VerifyingKey> for VerifyingKey {
fn from(src: ethereum::VerifyingKey) -> Self {
Self {
alfa_1: src.alpha1.into(),
beta_2: src.beta2.into(),
gamma_2: src.gamma2.into(),
delta_2: src.delta2.into(),
ic: src.ic.into_iter().map(|i| i.into()).collect(),
}
}
}
impl<M: Middleware> Groth16Verifier<M> {
async fn check_proof<
I: Into<ethereum::Inputs>,
P: Into<ethereum::Proof>,
VK: Into<ethereum::VerifyingKey>,
>(
&self,
proof: P,
vk: VK,
inputs: I,
) -> Result<bool, ContractError<M>> {
// convert into the expected format by the contract
let proof = proof.into().into();
let vk = vk.into().into();
let inputs = inputs.into().0;
// query the contract
let res = self.verify(inputs, proof, vk).call().await?;
Ok(res)
}
}