feat: fold noir circuits, add an e2e example, tests, a compile.sh script and update CI (#131)

examples/noir_full_flow.rs

@@ -0,0 +1,147 @@
+#![allow(non_snake_case)]
+#![allow(non_camel_case_types)]
+#![allow(clippy::upper_case_acronyms)]
+///
+/// This example performs the full flow:
+/// - define the circuit to be folded
+/// - fold the circuit with Nova+CycleFold's IVC
+/// - generate a DeciderEthCircuit final proof
+/// - generate the Solidity contract that verifies the proof
+/// - verify the proof in the EVM
+///
+use ark_bn254::{constraints::GVar, Bn254, Fr, G1Projective as G1};
+
+use ark_groth16::Groth16;
+use ark_grumpkin::{constraints::GVar as GVar2, Projective as G2};
+
+use folding_schemes::{
+    commitment::{kzg::KZG, pedersen::Pedersen},
+    folding::nova::{
+        decider_eth::{prepare_calldata, Decider as DeciderEth},
+        Nova, PreprocessorParam,
+    },
+    frontend::{
+        noir::{load_noir_circuit, NoirFCircuit},
+        FCircuit,
+    },
+    transcript::poseidon::poseidon_canonical_config,
+    Decider, FoldingScheme,
+};
+use std::{env, time::Instant};
+
+use solidity_verifiers::{
+    evm::{compile_solidity, Evm},
+    utils::get_function_selector_for_nova_cyclefold_verifier,
+    verifiers::nova_cyclefold::get_decider_template_for_cyclefold_decider,
+    NovaCycleFoldVerifierKey,
+};
+
+fn main() {
+    // set the initial state
+    let z_0 = vec![Fr::from(1)];
+
+    // initialize the noir fcircuit
+    let cur_path = env::current_dir().unwrap();
+
+    let circuit_path = format!(
+        "{}/folding-schemes/src/frontend/noir/test_folder/test_mimc/target/test_mimc.json",
+        cur_path.to_str().unwrap()
+    );
+
+    let circuit = load_noir_circuit(circuit_path);
+    let f_circuit = NoirFCircuit {
+        circuit,
+        state_len: 1,
+        external_inputs_len: 0,
+    };
+
+    pub type N = Nova<G1, GVar, G2, GVar2, NoirFCircuit<Fr>, KZG<'static, Bn254>, Pedersen<G2>>;
+    pub type D = DeciderEth<
+        G1,
+        GVar,
+        G2,
+        GVar2,
+        NoirFCircuit<Fr>,
+        KZG<'static, Bn254>,
+        Pedersen<G2>,
+        Groth16<Bn254>,
+        N,
+    >;
+
+    let poseidon_config = poseidon_canonical_config::<Fr>();
+    let mut rng = rand::rngs::OsRng;
+
+    // prepare the Nova prover & verifier params
+    let nova_preprocess_params = PreprocessorParam::new(poseidon_config, f_circuit.clone());
+    let nova_params = N::preprocess(&mut rng, &nova_preprocess_params).unwrap();
+
+    // initialize the folding scheme engine, in our case we use Nova
+    let mut nova = N::init(&nova_params, f_circuit.clone(), z_0).unwrap();
+
+    // prepare the Decider prover & verifier params
+    let (decider_pp, decider_vp) = D::preprocess(&mut rng, &nova_params, nova.clone()).unwrap();
+
+    // run n steps of the folding iteration
+    for i in 0..5 {
+        let start = Instant::now();
+        nova.prove_step(rng, vec![], None).unwrap();
+        println!("Nova::prove_step {}: {:?}", i, start.elapsed());
+    }
+
+    let start = Instant::now();
+    let proof = D::prove(rng, decider_pp, nova.clone()).unwrap();
+    println!("generated Decider proof: {:?}", start.elapsed());
+
+    let verified = D::verify(
+        decider_vp.clone(),
+        nova.i,
+        nova.z_0.clone(),
+        nova.z_i.clone(),
+        &nova.U_i,
+        &nova.u_i,
+        &proof,
+    )
+    .unwrap();
+    assert!(verified);
+    println!("Decider proof verification: {}", verified);
+
+    // Now, let's generate the Solidity code that verifies this Decider final proof
+    let function_selector =
+        get_function_selector_for_nova_cyclefold_verifier(nova.z_0.len() * 2 + 1);
+
+    let calldata: Vec<u8> = prepare_calldata(
+        function_selector,
+        nova.i,
+        nova.z_0,
+        nova.z_i,
+        &nova.U_i,
+        &nova.u_i,
+        proof,
+    )
+    .unwrap();
+
+    // prepare the setup params for the solidity verifier
+    let nova_cyclefold_vk = NovaCycleFoldVerifierKey::from((decider_vp, f_circuit.state_len()));
+
+    // generate the solidity code
+    let decider_solidity_code = get_decider_template_for_cyclefold_decider(nova_cyclefold_vk);
+
+    // verify the proof against the solidity code in the EVM
+    let nova_cyclefold_verifier_bytecode = compile_solidity(&decider_solidity_code, "NovaDecider");
+    let mut evm = Evm::default();
+    let verifier_address = evm.create(nova_cyclefold_verifier_bytecode);
+    let (_, output) = evm.call(verifier_address, calldata.clone());
+    assert_eq!(*output.last().unwrap(), 1);
+
+    // save smart contract and the calldata
+    println!("storing nova-verifier.sol and the calldata into files");
+    use std::fs;
+    fs::write(
+        "./examples/nova-verifier.sol",
+        decider_solidity_code.clone(),
+    )
+    .unwrap();
+    fs::write("./examples/solidity-calldata.calldata", calldata.clone()).unwrap();
+    let s = solidity_verifiers::utils::get_formatted_calldata(calldata.clone());
+    fs::write("./examples/solidity-calldata.inputs", s.join(",\n")).expect("");
+}