5 changed files with 582 additions and 264 deletions
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+20 -9README.md
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+237 -0src/keccak_chain.rs
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+3 -255src/lib.rs
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+273 -0src/sha_chain.rs
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+49 -0src/utils.rs
@ -1,21 +1,32 @@ |
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# keccak-chain-sonobe |
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# hash-chain-sonobe |
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Repo showcasing usage of [Sonobe](https://github.com/privacy-scaling-explorations/sonobe) with [Circom](https://github.com/iden3/circom) circuits. |
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Proves a chain of keccak256 hashes, using the [vocdoni/keccak256-circom](https://github.com/vocdoni/keccak256-circom) circuit, with [Nova](https://eprint.iacr.org/2021/370.pdf)+[CycleFold](https://eprint.iacr.org/2023/1192.pdf). |
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Repo showcasing usage of [Sonobe](https://github.com/privacy-scaling-explorations/sonobe) with [Arkworks](https://github.com/arkworks-rs) and [Circom](https://github.com/iden3/circom) circuits. |
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The main idea is to prove $z_n = H(H(...~H(H(H(z_0)))))$, where $n$ is the number of Keccak256 hashes ($H$) that we compute. Proving this in a 'normal' R1CS circuit for a large $n$ would be too costly, but with folding we can manage to prove it in a reasonable time span. |
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For more info about Sonobe, check out [Sonobe's docs](https://privacy-scaling-explorations.github.io/sonobe-docs). |
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<p align="center"> |
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<img src="https://privacy-scaling-explorations.github.io/sonobe-docs/imgs/folding-main-idea-diagram.png" style="width:70%;" /> |
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</p> |
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### Usage |
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Assuming rust and circom have been installed: |
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### sha_chain.rs (arkworks circuit) |
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Proves a chain of SHA256 hashes, using the [arkworks/sha256](https://github.com/arkworks-rs/crypto-primitives/blob/main/crypto-primitives/src/crh/sha256/constraints.rs) circuit, with [Nova](https://eprint.iacr.org/2021/370.pdf)+[CycleFold](https://eprint.iacr.org/2023/1192.pdf). |
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- `cargo test --release sha_chain -- --nocapture` |
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### keccak_chain.rs (circom circuit) |
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Proves a chain of keccak256 hashes, using the [vocdoni/keccak256-circom](https://github.com/vocdoni/keccak256-circom) circuit, with [Nova](https://eprint.iacr.org/2021/370.pdf)+[CycleFold](https://eprint.iacr.org/2023/1192.pdf). |
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Assuming rust and circom have been installed: |
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- `./compile-circuit.sh` |
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- `cargo test --release -- --nocapture` |
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- `cargo test --release keccak_chain -- --nocapture` |
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Note: the Circom variant currently has a bit of extra overhead since at each folding step it uses Circom witness generation to obtain the witness and then it imports it into the arkworks constraint system. |
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### Repo structure |
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- the Circom circuit to be folded is defined at [./circuit/keccak-chain.circom](https://github.com/arnaucube/keccak-chain-sonobe/blob/main/circuit/keccak-chain.circom) |
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- the logic to fold the circuit using Sonobe is defined at [src/lib.rs](https://github.com/arnaucube/keccak-chain-sonobe/blob/main/src/lib.rs) |
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- (it contains some extra sanity check that would not be needed in a real-world use case) |
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- the Circom circuit (that defines the keccak-chain) to be folded is defined at [./circuit/keccak-chain.circom](https://github.com/arnaucube/hash-chain-sonobe/blob/main/circuit/keccak-chain.circom) |
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- the logic to fold the circuit using Sonobe is defined at [src/{sha_chain, keccak_chain}.rs](https://github.com/arnaucube/hash-chain-sonobe/blob/main/src) |
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@ -0,0 +1,237 @@ |
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///
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/// This example performs the full flow:
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/// - define the circuit to be folded
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/// - fold the circuit with Nova+CycleFold's IVC
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/// - generate a DeciderEthCircuit final proof
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/// - generate the Solidity contract that verifies the proof
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/// - verify the proof in the EVM
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///
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#[cfg(test)]
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mod tests {
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use ark_bn254::{constraints::GVar, Bn254, Fr, G1Projective as G1};
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use ark_grumpkin::{constraints::GVar as GVar2, Projective as G2};
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use ark_groth16::Groth16;
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use ark_ff::PrimeField;
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use std::path::PathBuf;
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use std::rc::Rc;
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use std::time::Instant;
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use folding_schemes::{
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commitment::{kzg::KZG, pedersen::Pedersen},
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folding::nova::{
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decider_eth::{prepare_calldata, Decider as DeciderEth},
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Nova, PreprocessorParam,
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},
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frontend::{circom::CircomFCircuit, FCircuit},
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transcript::poseidon::poseidon_canonical_config,
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Decider, Error, FoldingScheme,
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};
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use solidity_verifiers::{
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utils::get_function_selector_for_nova_cyclefold_verifier,
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verifiers::nova_cyclefold::get_decider_template_for_cyclefold_decider,
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NovaCycleFoldVerifierKey,
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};
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use crate::utils::tests::*;
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// function to compute the next state of the folding via rust-native code (not Circom). Used to
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// check the Circom values.
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use tiny_keccak::{Hasher, Keccak};
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fn rust_native_step<F: PrimeField>(
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_i: usize,
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z_i: Vec<F>,
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_external_inputs: Vec<F>,
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) -> Result<Vec<F>, Error> {
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let b = f_vec_bits_to_bytes(z_i.to_vec());
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let mut h = Keccak::v256();
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h.update(&b);
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let mut z_i1 = [0u8; 32];
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h.finalize(&mut z_i1);
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bytes_to_f_vec_bits(z_i1.to_vec())
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}
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#[test]
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fn full_flow() {
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// set how many steps of folding we want to compute
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let n_steps = 1000;
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// set the initial state
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let z_0_aux: Vec<u32> = vec![0_u32; 32 * 8];
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let z_0: Vec<Fr> = z_0_aux.iter().map(|v| Fr::from(*v)).collect::<Vec<Fr>>();
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// initialize the Circom circuit
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let r1cs_path = PathBuf::from("./circuit/keccak-chain.r1cs");
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let wasm_path = PathBuf::from("./circuit/keccak-chain_js/keccak-chain.wasm");
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let f_circuit_params = (r1cs_path, wasm_path, 32 * 8, 0);
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let mut f_circuit = CircomFCircuit::<Fr>::new(f_circuit_params).unwrap();
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// Note (optional): for more speed, we can set a custom rust-native logic, which will be
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// used for the `step_native` method instead of extracting the values from the circom
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// witness:
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f_circuit.set_custom_step_native(Rc::new(rust_native_step));
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// ----------------
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// Sanity check
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// check that the f_circuit produces valid R1CS constraints
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use ark_r1cs_std::alloc::AllocVar;
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use ark_r1cs_std::fields::fp::FpVar;
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use ark_r1cs_std::R1CSVar;
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use ark_relations::r1cs::ConstraintSystem;
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let cs = ConstraintSystem::<Fr>::new_ref();
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let z_0_var = Vec::<FpVar<Fr>>::new_witness(cs.clone(), || Ok(z_0.clone())).unwrap();
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let z_1_var = f_circuit
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.generate_step_constraints(cs.clone(), 1, z_0_var, vec![])
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.unwrap();
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// check z_1_var against the native z_1
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let z_1_native = f_circuit.step_native(1, z_0.clone(), vec![]).unwrap();
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assert_eq!(z_1_var.value().unwrap(), z_1_native);
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// check that the constraint system is satisfied
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assert!(cs.is_satisfied().unwrap());
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// ----------------
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// define type aliases to avoid writting the whole type each time
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pub type N =
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Nova<G1, GVar, G2, GVar2, CircomFCircuit<Fr>, KZG<'static, Bn254>, Pedersen<G2>, false>;
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pub type D = DeciderEth<
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G1,
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GVar,
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G2,
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GVar2,
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CircomFCircuit<Fr>,
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KZG<'static, Bn254>,
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Pedersen<G2>,
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Groth16<Bn254>,
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N,
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>;
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let poseidon_config = poseidon_canonical_config::<Fr>();
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let mut rng = rand::rngs::OsRng;
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// prepare the Nova prover & verifier params
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let nova_preprocess_params = PreprocessorParam::new(poseidon_config, f_circuit.clone());
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let start = Instant::now();
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let nova_params = N::preprocess(&mut rng, &nova_preprocess_params).unwrap();
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println!("Nova params generated: {:?}", start.elapsed());
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// initialize the folding scheme engine, in our case we use Nova
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let mut nova = N::init(&nova_params, f_circuit.clone(), z_0.clone()).unwrap();
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// prepare the Decider prover & verifier params
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let start = Instant::now();
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let (decider_pp, decider_vp) = D::preprocess(&mut rng, &nova_params, nova.clone()).unwrap();
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println!("Decider params generated: {:?}", start.elapsed());
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// run n steps of the folding iteration
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let start_full = Instant::now();
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for _ in 0..n_steps {
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let start = Instant::now();
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nova.prove_step(rng, vec![], None).unwrap();
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println!(
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"Nova::prove_step (keccak256 through Circom) {}: {:?}",
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nova.i,
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start.elapsed()
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);
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}
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println!("Nova's all steps time: {:?}", start_full.elapsed());
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// perform the hash chain natively in rust (which uses a rust Keccak256 library)
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let mut z_i_native = z_0.clone();
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for i in 0..n_steps {
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z_i_native = rust_native_step(i, z_i_native.clone(), vec![]).unwrap();
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}
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// check that the value of the last folding state (nova.z_i) computed through folding, is
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// equal to the natively computed hash using the rust_native_step method
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assert_eq!(nova.z_i, z_i_native);
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// ----------------
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// Sanity check
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// The following lines contain a sanity check that checks the IVC proof (before going into
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// the zkSNARK proof)
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let (running_instance, incoming_instance, cyclefold_instance) = nova.instances();
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N::verify(
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nova_params.1, // Nova's verifier params
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z_0,
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nova.z_i.clone(),
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nova.i,
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running_instance,
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incoming_instance,
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cyclefold_instance,
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)
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.unwrap();
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// ----------------
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let rng = rand::rngs::OsRng;
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let start = Instant::now();
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let proof = D::prove(rng, decider_pp, nova.clone()).unwrap();
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println!("generated Decider proof: {:?}", start.elapsed());
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let verified = D::verify(
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decider_vp.clone(),
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nova.i,
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nova.z_0.clone(),
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nova.z_i.clone(),
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&nova.U_i,
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&nova.u_i,
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&proof,
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)
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.unwrap();
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assert!(verified);
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println!("Decider proof verification: {}", verified);
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// generate the Solidity code that verifies this Decider final proof
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let function_selector =
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get_function_selector_for_nova_cyclefold_verifier(nova.z_0.len() * 2 + 1);
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let calldata: Vec<u8> = prepare_calldata(
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function_selector,
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nova.i,
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nova.z_0,
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nova.z_i,
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&nova.U_i,
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&nova.u_i,
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proof,
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)
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.unwrap();
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// prepare the setup params for the solidity verifier
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let nova_cyclefold_vk = NovaCycleFoldVerifierKey::from((decider_vp, f_circuit.state_len()));
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// generate the solidity code
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let decider_solidity_code = get_decider_template_for_cyclefold_decider(nova_cyclefold_vk);
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/*
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* Note: since we're proving the Keccak256 (ie. 32 byte size, 256 bits), the number of
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* inputs is too big for the contract. In a real world use case we would convert the binary
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* representation into a couple of field elements which would be inputs of the Decider
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* circuit, and in-circuit we would obtain the binary representation to be used for the
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* final proof check.
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*
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* The following code is commented out for that reason.
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// verify the proof against the solidity code in the EVM
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use solidity_verifiers::evm::{compile_solidity, Evm};
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let nova_cyclefold_verifier_bytecode =
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compile_solidity(&decider_solidity_code, "NovaDecider");
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let mut evm = Evm::default();
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let verifier_address = evm.create(nova_cyclefold_verifier_bytecode);
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let (_, output) = evm.call(verifier_address, calldata.clone());
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assert_eq!(*output.last().unwrap(), 1);
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*/
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// save smart contract and the calldata
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println!("storing nova-verifier.sol and the calldata into files");
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use std::fs;
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fs::create_dir_all("./solidity").unwrap();
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fs::write(
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"./solidity/nova-verifier.sol",
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decider_solidity_code.clone(),
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)
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.unwrap();
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fs::write("./solidity/solidity-calldata.calldata", calldata.clone()).unwrap();
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let s = solidity_verifiers::utils::get_formatted_calldata(calldata.clone());
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fs::write("./solidity/solidity-calldata.inputs", s.join(",\n")).expect("");
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}
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}
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@ -1,259 +1,7 @@ |
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#![allow(non_snake_case)]
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#![allow(non_camel_case_types)]
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#![allow(clippy::upper_case_acronyms)]
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///
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/// This example performs the full flow:
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/// - define the circuit to be folded
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/// - fold the circuit with Nova+CycleFold's IVC
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/// - generate a DeciderEthCircuit final proof
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/// - generate the Solidity contract that verifies the proof
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/// - verify the proof in the EVM
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///
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#[cfg(test)]
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mod tests {
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use ark_bn254::{constraints::GVar, Bn254, Fr, G1Projective as G1};
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use ark_grumpkin::{constraints::GVar as GVar2, Projective as G2};
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use ark_groth16::Groth16;
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use ark_ff::{BigInteger, BigInteger256, PrimeField};
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use std::path::PathBuf;
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use std::rc::Rc;
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use std::time::Instant;
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use folding_schemes::{
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commitment::{kzg::KZG, pedersen::Pedersen},
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folding::nova::{
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decider_eth::{prepare_calldata, Decider as DeciderEth},
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Nova, PreprocessorParam,
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},
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frontend::{circom::CircomFCircuit, FCircuit},
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transcript::poseidon::poseidon_canonical_config,
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Decider, Error, FoldingScheme,
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};
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use solidity_verifiers::{
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utils::get_function_selector_for_nova_cyclefold_verifier,
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verifiers::nova_cyclefold::get_decider_template_for_cyclefold_decider,
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NovaCycleFoldVerifierKey,
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};
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fn f_vec_to_bits<F: PrimeField>(v: Vec<F>) -> Vec<bool> {
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v.iter()
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.map(|v_i| {
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if v_i.is_one() {
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return true;
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}
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false
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})
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.collect()
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}
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// returns the bytes representation of the given vector of finite field elements that represent
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// bits
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fn f_vec_to_bytes<F: PrimeField>(v: Vec<F>) -> Vec<u8> {
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let b = f_vec_to_bits(v);
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BigInteger256::from_bits_le(&b).to_bytes_le()
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}
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fn bytes_to_f_vec<F: PrimeField>(b: Vec<u8>) -> Result<Vec<F>, Error> {
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use num_bigint::BigUint;
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let bi = BigUint::from_bytes_le(&b);
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let bi = BigInteger256::try_from(bi).unwrap();
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let bits = bi.to_bits_le();
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Ok(bits
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.iter()
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.map(|&e| if e { F::one() } else { F::zero() })
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.collect())
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}
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// function to compute the next state of the folding via rust-native code (not Circom). Used to
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// check the Circom values.
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use tiny_keccak::{Hasher, Keccak};
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fn rust_native_step<F: PrimeField>(
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_i: usize,
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z_i: Vec<F>,
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_external_inputs: Vec<F>,
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) -> Result<Vec<F>, Error> {
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let b = f_vec_to_bytes(z_i.to_vec());
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let mut h = Keccak::v256();
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h.update(&b);
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let mut z_i1 = [0u8; 32];
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h.finalize(&mut z_i1);
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bytes_to_f_vec(z_i1.to_vec())
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}
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#[test]
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fn full_flow() {
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// set how many steps of folding we want to compute
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let n_steps = 10;
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// set the initial state
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let z_0_aux: Vec<u32> = vec![0_u32; 32 * 8];
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let z_0: Vec<Fr> = z_0_aux.iter().map(|v| Fr::from(*v)).collect::<Vec<Fr>>();
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// initialize the Circom circuit
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let r1cs_path = PathBuf::from("./circuit/keccak-chain.r1cs");
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let wasm_path = PathBuf::from("./circuit/keccak-chain_js/keccak-chain.wasm");
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let f_circuit_params = (r1cs_path, wasm_path, 32 * 8, 0);
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let mut f_circuit = CircomFCircuit::<Fr>::new(f_circuit_params).unwrap();
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// Note (optional): for more speed, we can set a custom rust-native logic, which will be
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// used for the `step_native` method instead of extracting the values from the circom
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// witness:
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f_circuit.set_custom_step_native(Rc::new(rust_native_step));
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// ----------------
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// Sanity check
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// check that the f_circuit produces valid R1CS constraints
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use ark_r1cs_std::alloc::AllocVar;
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use ark_r1cs_std::fields::fp::FpVar;
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use ark_r1cs_std::R1CSVar;
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use ark_relations::r1cs::ConstraintSystem;
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let cs = ConstraintSystem::<Fr>::new_ref();
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let z_0_var = Vec::<FpVar<Fr>>::new_witness(cs.clone(), || Ok(z_0.clone())).unwrap();
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let z_1_var = f_circuit
|
|||
.generate_step_constraints(cs.clone(), 1, z_0_var, vec![])
|
|||
.unwrap();
|
|||
// check z_1_var against the native z_1
|
|||
let z_1_native = f_circuit.step_native(1, z_0.clone(), vec![]).unwrap();
|
|||
assert_eq!(z_1_var.value().unwrap(), z_1_native);
|
|||
// check that the constraint system is satisfied
|
|||
assert!(cs.is_satisfied().unwrap());
|
|||
// ----------------
|
|||
|
|||
// define type aliases to avoid writting the whole type each time
|
|||
pub type N =
|
|||
Nova<G1, GVar, G2, GVar2, CircomFCircuit<Fr>, KZG<'static, Bn254>, Pedersen<G2>, false>;
|
|||
pub type D = DeciderEth<
|
|||
G1,
|
|||
GVar,
|
|||
G2,
|
|||
GVar2,
|
|||
CircomFCircuit<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 start = Instant::now();
|
|||
let nova_params = N::preprocess(&mut rng, &nova_preprocess_params).unwrap();
|
|||
println!("Nova params generated: {:?}", start.elapsed());
|
|||
|
|||
// initialize the folding scheme engine, in our case we use Nova
|
|||
let mut nova = N::init(&nova_params, f_circuit.clone(), z_0.clone()).unwrap();
|
|||
|
|||
// prepare the Decider prover & verifier params
|
|||
let start = Instant::now();
|
|||
let (decider_pp, decider_vp) = D::preprocess(&mut rng, &nova_params, nova.clone()).unwrap();
|
|||
println!("Decider params generated: {:?}", start.elapsed());
|
|||
|
|||
// run n steps of the folding iteration
|
|||
for _ in 0..n_steps {
|
|||
let start = Instant::now();
|
|||
nova.prove_step(rng, vec![], None).unwrap();
|
|||
println!("Nova::prove_step {}: {:?}", nova.i, start.elapsed());
|
|||
}
|
|||
|
|||
// perform the hash chain natively in rust (which uses a rust Keccak256 library)
|
|||
let mut z_i_native = z_0.clone();
|
|||
for i in 0..n_steps {
|
|||
z_i_native = rust_native_step(i, z_i_native.clone(), vec![]).unwrap();
|
|||
}
|
|||
// check that the value of the last folding state (nova.z_i) computed through folding, is
|
|||
// equal to the natively computed hash using the rust_native_step method
|
|||
assert_eq!(nova.z_i, z_i_native);
|
|||
|
|||
// ----------------
|
|||
// Sanity check
|
|||
// The following lines contain a sanity check that checks the IVC proof (before going into
|
|||
// the zkSNARK proof)
|
|||
let (running_instance, incoming_instance, cyclefold_instance) = nova.instances();
|
|||
N::verify(
|
|||
nova_params.1, // Nova's verifier params
|
|||
z_0,
|
|||
nova.z_i.clone(),
|
|||
nova.i,
|
|||
running_instance,
|
|||
incoming_instance,
|
|||
cyclefold_instance,
|
|||
)
|
|||
.unwrap();
|
|||
// ----------------
|
|||
|
|||
let rng = rand::rngs::OsRng;
|
|||
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);
|
|||
|
|||
// 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);
|
|||
|
|||
/*
|
|||
* Note: since we're proving the Keccak256 (ie. 32 byte size, 256 bits), the number of
|
|||
* inputs is too big for the contract. In a real world use case we would convert the binary
|
|||
* representation into a couple of field elements which would be inputs of the Decider
|
|||
* circuit, and in-circuit we would obtain the binary representation to be used for the
|
|||
* final proof check.
|
|||
*
|
|||
* The following code is commented out for that reason.
|
|||
// verify the proof against the solidity code in the EVM
|
|||
use solidity_verifiers::evm::{compile_solidity, 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::create_dir_all("./solidity").unwrap();
|
|||
fs::write(
|
|||
"./solidity/nova-verifier.sol",
|
|||
decider_solidity_code.clone(),
|
|||
)
|
|||
.unwrap();
|
|||
fs::write("./solidity/solidity-calldata.calldata", calldata.clone()).unwrap();
|
|||
let s = solidity_verifiers::utils::get_formatted_calldata(calldata.clone());
|
|||
fs::write("./solidity/solidity-calldata.inputs", s.join(",\n")).expect("");
|
|||
}
|
|||
}
|
|||
mod keccak_chain;
|
|||
mod sha_chain;
|
|||
mod utils;
|
|||
@ -0,0 +1,273 @@ |
|||
///
|
|||
/// 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
|
|||
///
|
|||
|
|||
#[cfg(test)]
|
|||
mod tests {
|
|||
use ark_bn254::{constraints::GVar, Bn254, Fr, G1Projective as G1};
|
|||
use ark_grumpkin::{constraints::GVar as GVar2, Projective as G2};
|
|||
|
|||
use ark_groth16::Groth16;
|
|||
|
|||
use ark_ff::PrimeField;
|
|||
|
|||
use std::time::Instant;
|
|||
|
|||
use ark_crypto_primitives::crh::sha256::{constraints::Sha256Gadget, digest::Digest, Sha256};
|
|||
use ark_r1cs_std::fields::fp::FpVar;
|
|||
use ark_r1cs_std::{bits::uint8::UInt8, boolean::Boolean, ToBitsGadget, ToBytesGadget};
|
|||
use ark_relations::r1cs::{ConstraintSystemRef, SynthesisError};
|
|||
use std::marker::PhantomData;
|
|||
|
|||
use folding_schemes::{
|
|||
commitment::{kzg::KZG, pedersen::Pedersen},
|
|||
folding::nova::{
|
|||
decider_eth::{prepare_calldata, Decider as DeciderEth},
|
|||
Nova, PreprocessorParam,
|
|||
},
|
|||
frontend::FCircuit,
|
|||
transcript::poseidon::poseidon_canonical_config,
|
|||
Decider, Error, FoldingScheme,
|
|||
};
|
|||
use solidity_verifiers::{
|
|||
utils::get_function_selector_for_nova_cyclefold_verifier,
|
|||
verifiers::nova_cyclefold::get_decider_template_for_cyclefold_decider,
|
|||
NovaCycleFoldVerifierKey,
|
|||
};
|
|||
|
|||
use crate::utils::tests::*;
|
|||
|
|||
/// Test circuit to be folded
|
|||
#[derive(Clone, Copy, Debug)]
|
|||
pub struct SHA256FoldStepCircuit<F: PrimeField> {
|
|||
_f: PhantomData<F>,
|
|||
}
|
|||
impl<F: PrimeField> FCircuit<F> for SHA256FoldStepCircuit<F> {
|
|||
type Params = ();
|
|||
fn new(_params: Self::Params) -> Result<Self, Error> {
|
|||
Ok(Self { _f: PhantomData })
|
|||
}
|
|||
fn state_len(&self) -> usize {
|
|||
32
|
|||
}
|
|||
fn external_inputs_len(&self) -> usize {
|
|||
0
|
|||
}
|
|||
// function to compute the next state of the folding via rust-native code (not Circom). Used to
|
|||
// check the Circom values.
|
|||
fn step_native(
|
|||
&self,
|
|||
_i: usize,
|
|||
z_i: Vec<F>,
|
|||
_external_inputs: Vec<F>,
|
|||
) -> Result<Vec<F>, Error> {
|
|||
let b = f_vec_to_bytes(z_i.to_vec());
|
|||
let mut sha256 = Sha256::default();
|
|||
sha256.update(b);
|
|||
let z_i1 = sha256.finalize().to_vec();
|
|||
|
|||
bytes_to_f_vec(z_i1.to_vec())
|
|||
}
|
|||
fn generate_step_constraints(
|
|||
&self,
|
|||
_cs: ConstraintSystemRef<F>,
|
|||
_i: usize,
|
|||
z_i: Vec<FpVar<F>>,
|
|||
_external_inputs: Vec<FpVar<F>>,
|
|||
) -> Result<Vec<FpVar<F>>, SynthesisError> {
|
|||
let mut sha256_var = Sha256Gadget::default();
|
|||
let z_i_u8: Vec<UInt8<F>> = z_i
|
|||
.iter()
|
|||
.map(|f| UInt8::<F>::from_bits_le(&f.to_bits_le().unwrap()[..8]))
|
|||
.collect::<Vec<_>>();
|
|||
sha256_var.update(&z_i_u8).unwrap();
|
|||
let z_i1_u8 = sha256_var.finalize()?.to_bytes()?;
|
|||
let z_i1: Vec<FpVar<F>> = z_i1_u8
|
|||
.iter()
|
|||
.map(|e| {
|
|||
let bits = e.to_bits_le().unwrap();
|
|||
Boolean::<F>::le_bits_to_fp_var(&bits).unwrap()
|
|||
})
|
|||
.collect();
|
|||
|
|||
Ok(z_i1)
|
|||
}
|
|||
}
|
|||
|
|||
#[test]
|
|||
fn full_flow() {
|
|||
// set how many steps of folding we want to compute
|
|||
let n_steps = 100;
|
|||
|
|||
// set the initial state
|
|||
// let z_0_aux: Vec<u32> = vec![0_u32; 32 * 8];
|
|||
let z_0_aux: Vec<u8> = vec![0_u8; 32];
|
|||
let z_0: Vec<Fr> = z_0_aux.iter().map(|v| Fr::from(*v)).collect::<Vec<Fr>>();
|
|||
|
|||
let f_circuit = SHA256FoldStepCircuit::<Fr>::new(()).unwrap();
|
|||
|
|||
// ----------------
|
|||
// Sanity check
|
|||
// check that the f_circuit produces valid R1CS constraints
|
|||
use ark_r1cs_std::alloc::AllocVar;
|
|||
use ark_r1cs_std::fields::fp::FpVar;
|
|||
use ark_r1cs_std::R1CSVar;
|
|||
use ark_relations::r1cs::ConstraintSystem;
|
|||
let cs = ConstraintSystem::<Fr>::new_ref();
|
|||
let z_0_var = Vec::<FpVar<Fr>>::new_witness(cs.clone(), || Ok(z_0.clone())).unwrap();
|
|||
let z_1_var = f_circuit
|
|||
.generate_step_constraints(cs.clone(), 1, z_0_var, vec![])
|
|||
.unwrap();
|
|||
// check z_1_var against the native z_1
|
|||
let z_1_native = f_circuit.step_native(1, z_0.clone(), vec![]).unwrap();
|
|||
assert_eq!(z_1_var.value().unwrap(), z_1_native);
|
|||
// check that the constraint system is satisfied
|
|||
assert!(cs.is_satisfied().unwrap());
|
|||
// ----------------
|
|||
|
|||
// define type aliases to avoid writting the whole type each time
|
|||
pub type N = Nova<
|
|||
G1,
|
|||
GVar,
|
|||
G2,
|
|||
GVar2,
|
|||
SHA256FoldStepCircuit<Fr>,
|
|||
KZG<'static, Bn254>,
|
|||
Pedersen<G2>,
|
|||
false,
|
|||
>;
|
|||
pub type D = DeciderEth<
|
|||
G1,
|
|||
GVar,
|
|||
G2,
|
|||
GVar2,
|
|||
SHA256FoldStepCircuit<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);
|
|||
let start = Instant::now();
|
|||
let nova_params = N::preprocess(&mut rng, &nova_preprocess_params).unwrap();
|
|||
println!("Nova params generated: {:?}", start.elapsed());
|
|||
|
|||
// initialize the folding scheme engine, in our case we use Nova
|
|||
let mut nova = N::init(&nova_params, f_circuit, z_0.clone()).unwrap();
|
|||
|
|||
// prepare the Decider prover & verifier params
|
|||
let start = Instant::now();
|
|||
let (decider_pp, decider_vp) = D::preprocess(&mut rng, &nova_params, nova.clone()).unwrap();
|
|||
println!("Decider params generated: {:?}", start.elapsed());
|
|||
|
|||
// run n steps of the folding iteration
|
|||
let start_full = Instant::now();
|
|||
for _ in 0..n_steps {
|
|||
let start = Instant::now();
|
|||
nova.prove_step(rng, vec![], None).unwrap();
|
|||
println!(
|
|||
"Nova::prove_step (sha256) {}: {:?}",
|
|||
nova.i,
|
|||
start.elapsed()
|
|||
);
|
|||
}
|
|||
println!("Nova's all steps time: {:?}", start_full.elapsed());
|
|||
|
|||
// ----------------
|
|||
// Sanity check
|
|||
// The following lines contain a sanity check that checks the IVC proof (before going into
|
|||
// the zkSNARK proof)
|
|||
let (running_instance, incoming_instance, cyclefold_instance) = nova.instances();
|
|||
N::verify(
|
|||
nova_params.1, // Nova's verifier params
|
|||
z_0,
|
|||
nova.z_i.clone(),
|
|||
nova.i,
|
|||
running_instance,
|
|||
incoming_instance,
|
|||
cyclefold_instance,
|
|||
)
|
|||
.unwrap();
|
|||
// ----------------
|
|||
|
|||
let rng = rand::rngs::OsRng;
|
|||
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);
|
|||
|
|||
// 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);
|
|||
|
|||
/*
|
|||
* Note: since we're proving the SHA256 (ie. 32 byte size, 256 bits), the number of inputs
|
|||
* is too big for the contract. In a real world use case we would convert the binary
|
|||
* representation into a couple of field elements which would be inputs of the Decider
|
|||
* circuit, and in-circuit we would obtain the binary representation to be used for the
|
|||
* final proof check.
|
|||
*
|
|||
* The following code is commented out for that reason.
|
|||
// verify the proof against the solidity code in the EVM
|
|||
use solidity_verifiers::evm::{compile_solidity, 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::create_dir_all("./solidity").unwrap();
|
|||
fs::write(
|
|||
"./solidity/nova-verifier.sol",
|
|||
decider_solidity_code.clone(),
|
|||
)
|
|||
.unwrap();
|
|||
fs::write("./solidity/solidity-calldata.calldata", calldata.clone()).unwrap();
|
|||
let s = solidity_verifiers::utils::get_formatted_calldata(calldata.clone());
|
|||
fs::write("./solidity/solidity-calldata.inputs", s.join(",\n")).expect("");
|
|||
}
|
|||
}
|
|||
@ -0,0 +1,49 @@ |
|||
#[cfg(test)]
|
|||
pub(crate) mod tests {
|
|||
use ark_ff::{BigInteger, BigInteger256, PrimeField};
|
|||
use folding_schemes::Error;
|
|||
|
|||
/// interprets the vector of finite field elements as a vector of bytes
|
|||
pub(crate) fn f_vec_to_bytes<F: PrimeField>(b: Vec<F>) -> Vec<u8> {
|
|||
b.iter()
|
|||
.map(|e| {
|
|||
let bytes: Vec<u8> = e.into_bigint().to_bytes_le();
|
|||
bytes[0]
|
|||
})
|
|||
.collect()
|
|||
}
|
|||
/// for a given byte array, returns the bytes representation in finite field elements
|
|||
pub(crate) fn bytes_to_f_vec<F: PrimeField>(b: Vec<u8>) -> Result<Vec<F>, Error> {
|
|||
Ok(b.iter()
|
|||
.map(|&e| F::from_le_bytes_mod_order(&[e]))
|
|||
.collect::<Vec<F>>())
|
|||
}
|
|||
/// returns the bytes representation of the given vector of finite field elements that represent
|
|||
/// bits
|
|||
pub(crate) fn f_vec_bits_to_bytes<F: PrimeField>(v: Vec<F>) -> Vec<u8> {
|
|||
let b = f_vec_to_bits(v);
|
|||
BigInteger256::from_bits_le(&b).to_bytes_le()
|
|||
}
|
|||
/// for a given byte array, returns its bits representation in finite field elements
|
|||
pub(crate) fn bytes_to_f_vec_bits<F: PrimeField>(b: Vec<u8>) -> Result<Vec<F>, Error> {
|
|||
use num_bigint::BigUint;
|
|||
let bi = BigUint::from_bytes_le(&b);
|
|||
let bi = BigInteger256::try_from(bi).unwrap();
|
|||
let bits = bi.to_bits_le();
|
|||
Ok(bits
|
|||
.iter()
|
|||
.map(|&e| if e { F::one() } else { F::zero() })
|
|||
.collect())
|
|||
}
|
|||
/// interprets the given vector of finite field elements as a vector of bits
|
|||
pub(crate) fn f_vec_to_bits<F: PrimeField>(v: Vec<F>) -> Vec<bool> {
|
|||
v.iter()
|
|||
.map(|v_i| {
|
|||
if v_i.is_one() {
|
|||
return true;
|
|||
}
|
|||
false
|
|||
})
|
|||
.collect()
|
|||
}
|
|||
}
|
|||