Nova folding

src/circuit.rs

@@ -0,0 +1,21 @@
+use std::env::current_dir;
+use ark_bn254::Fr;
+use sonobe::frontend::circom::CircomFCircuit;
+use sonobe::frontend::FCircuit;
+
+const IVC_STEP_WIDTH: usize = 2;
+const STEP_INPUT_WIDTH: usize = 256;
+
+pub fn create_circuit() -> CircomFCircuit<Fr> {
+    let root = current_dir().expect("Failed to get current directory");
+    let circuit_file = root.join("circuit/grayscale_step.r1cs");
+    let witness_generator_file = root.join("circuit/grayscale_step_js/grayscale_step.wasm");
+
+    let f_circuit_params = (
+        circuit_file.into(),
+        witness_generator_file.into(),
+        IVC_STEP_WIDTH,
+        STEP_INPUT_WIDTH,
+    );
+    CircomFCircuit::<Fr>::new(f_circuit_params).expect("Failed to create circuit")
+}

src/folding.rs

@@ -0,0 +1,25 @@
+use ark_bn254::{Bn254, constraints::GVar, Fr, G1Projective as G1};
+use ark_grumpkin::{constraints::GVar as GVar2, Projective as G2};
+use rand::rngs::OsRng;
+use sonobe::{
+    commitment::{kzg::KZG, pedersen::Pedersen},
+    folding::nova::{Nova, PreprocessorParam},
+    FoldingScheme,
+    frontend::circom::CircomFCircuit,
+    transcript::poseidon::poseidon_canonical_config,
+};
+
+pub type NovaFolding =
+    Nova<G1, GVar, G2, GVar2, CircomFCircuit<Fr>, KZG<'static, Bn254>, Pedersen<G2>, false>;
+
+pub fn prepare_folding(
+    circuit: &CircomFCircuit<Fr>,
+    start_ivc_state: Vec<Fr>,
+    rng: &mut OsRng,
+) -> NovaFolding {
+    let nova_preprocess_params =
+        PreprocessorParam::new(poseidon_canonical_config::<Fr>(), circuit.clone());
+    let nova_params = NovaFolding::preprocess(&mut *rng, &nova_preprocess_params)
+        .expect("Failed to preprocess Nova");
+    NovaFolding::init(&nova_params, circuit.clone(), start_ivc_state).expect("Failed to init Nova")
+}

src/input.rs

@@ -0,0 +1,14 @@
+use std::{fs::File, io::Read};
+
+use ark_bn254::Fr;
+use ark_serialize::CanonicalDeserialize;
+
+pub fn prepare_input() -> Vec<Vec<Fr>> {
+    let mut file = File::open("circuit/input.bin").expect("Failed to open input file");
+    let mut buffer = Vec::new();
+    file.read_to_end(&mut buffer)
+        .expect("Failed to read input file");
+
+    CanonicalDeserialize::deserialize_uncompressed(&mut buffer.as_slice())
+        .expect("Failed to deserialize input")
+}

src/main.rs

@@ -1,3 +1,37 @@
-fn main() {
-    println!("Hello, world!");
+use std::time::Instant;
+
+use ark_bn254::Fr;
+use num_traits::identities::Zero;
+use sonobe::FoldingScheme;
+
+use crate::{circuit::create_circuit, folding::prepare_folding, input::prepare_input};
+
+fn measure<T, Action: FnOnce() -> T>(action_name: &str, action: Action) -> T {
+    let start = Instant::now();
+    let result = action();
+    println!("{action_name}: {:?}", start.elapsed());
+    result
+}
+
+mod circuit;
+mod folding;
+mod input;
+
+fn main() {
+    let mut rng = rand::rngs::OsRng;
+
+    let circuit = measure("Prepare circuit", create_circuit);
+
+    let start_ivc_state = vec![Fr::zero(); 2];
+    let mut folding = measure("Prepare folding", || {
+        prepare_folding(&circuit, start_ivc_state, &mut rng)
+    });
+
+    for (i, external_inputs_at_step) in prepare_input()[..5].iter().enumerate() {
+        measure(&format!("Nova::prove_step {i}"), || {
+            folding
+                .prove_step(rng, external_inputs_at_step.clone(), None)
+                .expect("Failed to prove step")
+        });
+    }
 }