1#![allow(non_snake_case)]
  2#![allow(non_camel_case_types)]
  3#![allow(clippy::upper_case_acronyms)]
  4///
  5/// This example performs the full flow:
  6/// - define the circuit to be folded
  7/// - fold the circuit with Nova+CycleFold's IVC
  8/// - generate a DeciderEthCircuit final proof
  9/// - generate the Solidity contract that verifies the proof
 10/// - verify the proof in the EVM
 11///
 12use ark_bn254::{constraints::GVar, Bn254, Fr, G1Projective as G1};
 13
 14use ark_groth16::Groth16;
 15use ark_grumpkin::{constraints::GVar as GVar2, Projective as G2};
 16
 17use folding_schemes::{
 18    commitment::{kzg::KZG, pedersen::Pedersen},
 19    folding::nova::{
 20        decider_eth::{prepare_calldata, Decider as DeciderEth},
 21        Nova, PreprocessorParam,
 22    },
 23    frontend::FCircuit,
 24    transcript::poseidon::poseidon_canonical_config,
 25    Decider, FoldingScheme,
 26};
 27use frontends::noir::{load_noir_circuit, NoirFCircuit};
 28use std::{env, time::Instant};
 29
 30use solidity_verifiers::{
 31    evm::{compile_solidity, Evm},
 32    utils::get_function_selector_for_nova_cyclefold_verifier,
 33    verifiers::nova_cyclefold::get_decider_template_for_cyclefold_decider,
 34    NovaCycleFoldVerifierKey,
 35};
 36
 37fn main() {
 38    // set the initial state
 39    let z_0 = vec![Fr::from(1)];
 40
 41    // initialize the noir fcircuit
 42    let cur_path = env::current_dir().unwrap();
 43
 44    let circuit_path = format!(
 45        "{}/frontends/src/noir/test_folder/test_mimc/target/test_mimc.json",
 46        cur_path.to_str().unwrap()
 47    );
 48
 49    let circuit = load_noir_circuit(circuit_path);
 50    let f_circuit = NoirFCircuit {
 51        circuit,
 52        state_len: 1,
 53        external_inputs_len: 0,
 54    };
 55
 56    pub type N = Nova<G1, GVar, G2, GVar2, NoirFCircuit<Fr>, KZG<'static, Bn254>, Pedersen<G2>>;
 57    pub type D = DeciderEth<
 58        G1,
 59        GVar,
 60        G2,
 61        GVar2,
 62        NoirFCircuit<Fr>,
 63        KZG<'static, Bn254>,
 64        Pedersen<G2>,
 65        Groth16<Bn254>,
 66        N,
 67    >;
 68
 69    let poseidon_config = poseidon_canonical_config::<Fr>();
 70    let mut rng = rand::rngs::OsRng;
 71
 72    // prepare the Nova prover & verifier params
 73    let nova_preprocess_params = PreprocessorParam::new(poseidon_config, f_circuit.clone());
 74    let nova_params = N::preprocess(&mut rng, &nova_preprocess_params).unwrap();
 75
 76    // initialize the folding scheme engine, in our case we use Nova
 77    let mut nova = N::init(&nova_params, f_circuit.clone(), z_0).unwrap();
 78
 79    // prepare the Decider prover & verifier params
 80    let (decider_pp, decider_vp) =
 81        D::preprocess(&mut rng, nova_params.clone(), nova.clone()).unwrap();
 82
 83    // run n steps of the folding iteration
 84    for i in 0..5 {
 85        let start = Instant::now();
 86        nova.prove_step(rng, vec![], None).unwrap();
 87        println!("Nova::prove_step {}: {:?}", i, start.elapsed());
 88    }
 89    // verify the last IVC proof
 90    let ivc_proof = nova.ivc_proof();
 91    N::verify(
 92        nova_params.1, // Nova's verifier params
 93        ivc_proof,
 94    )
 95    .unwrap();
 96
 97    let start = Instant::now();
 98    let proof = D::prove(rng, decider_pp, nova.clone()).unwrap();
 99    println!("generated Decider proof: {:?}", start.elapsed());
100
101    let verified = D::verify(
102        decider_vp.clone(),
103        nova.i,
104        nova.z_0.clone(),
105        nova.z_i.clone(),
106        &nova.U_i,
107        &nova.u_i,
108        &proof,
109    )
110    .unwrap();
111    assert!(verified);
112    println!("Decider proof verification: {}", verified);
113
114    // Now, let's generate the Solidity code that verifies this Decider final proof
115    let function_selector =
116        get_function_selector_for_nova_cyclefold_verifier(nova.z_0.len() * 2 + 1);
117
118    let calldata: Vec<u8> = prepare_calldata(
119        function_selector,
120        nova.i,
121        nova.z_0,
122        nova.z_i,
123        &nova.U_i,
124        &nova.u_i,
125        proof,
126    )
127    .unwrap();
128
129    // prepare the setup params for the solidity verifier
130    let nova_cyclefold_vk = NovaCycleFoldVerifierKey::from((decider_vp, f_circuit.state_len()));
131
132    // generate the solidity code
133    let decider_solidity_code = get_decider_template_for_cyclefold_decider(nova_cyclefold_vk);
134
135    // verify the proof against the solidity code in the EVM
136    let nova_cyclefold_verifier_bytecode = compile_solidity(&decider_solidity_code, "NovaDecider");
137    let mut evm = Evm::default();
138    let verifier_address = evm.create(nova_cyclefold_verifier_bytecode);
139    let (_, output) = evm.call(verifier_address, calldata.clone());
140    assert_eq!(*output.last().unwrap(), 1);
141
142    // save smart contract and the calldata
143    println!("storing nova-verifier.sol and the calldata into files");
144    use std::fs;
145    fs::write(
146        "./examples/nova-verifier.sol",
147        decider_solidity_code.clone(),
148    )
149    .unwrap();
150    fs::write("./examples/solidity-calldata.calldata", calldata.clone()).unwrap();
151    let s = solidity_verifiers::utils::get_formatted_calldata(calldata.clone());
152    fs::write("./examples/solidity-calldata.inputs", s.join(",\n")).expect("");
153}