add folding logic test

src/fcircuit.rs

@@ -70,12 +70,11 @@ where
             .ok_or(ark_relations::r1cs::SynthesisError::Unsatisfiable)?;
 
         // check that the last signer is signed by the new signer
-        let ei: SigPkVar<C, GC> = external_inputs.into();
         let res = verify::<C, GC>(
             cs.clone(),
             self.config.clone(),
-            ei.pk.clone(),
+            external_inputs.pk.clone(),
-            (ei.sig_r, ei.sig_s),
+            (external_inputs.sig_r, external_inputs.sig_s),
             msg.clone(),
         )?;
         res.enforce_equal(&Boolean::<F>::TRUE)?;
@@ -83,7 +82,7 @@ where
         // increment the degree
         degree = degree.clone() + FpVar::<F>::one();
 
-        let pk_i1_xy = ei.pk.to_constraint_field()?;
+        let pk_i1_xy = external_inputs.pk.to_constraint_field()?;
         Ok(vec![vec![pk_0_x, pk_0_y], pk_i1_xy, vec![degree]].concat())
     }
 }

src/fold_ethdos.rs

@@ -0,0 +1,84 @@
+#[cfg(test)]
+mod tests {
+    use ark_bn254::{Fr, G1Projective as G1};
+    use ark_ec::AffineRepr;
+    use ark_grumpkin::Projective as G2;
+    use ark_std::Zero;
+    use rand::rngs::OsRng;
+
+    use arkeddsa::ed_on_bn254_twist::{constraints::EdwardsVar, EdwardsProjective};
+
+    use folding_schemes::{
+        commitment::pedersen::Pedersen,
+        folding::nova::{Nova, PreprocessorParam},
+        frontend::FCircuit,
+        transcript::poseidon::poseidon_canonical_config,
+        FoldingScheme,
+    };
+
+    use crate::{
+        fcircuit::EthDosCircuit,
+        signature::gen_signatures,
+        utils::{dbg, elapsed, get_time},
+    };
+
+    #[test]
+    fn full_flow() {
+        // set how many steps of folding we want to compute
+        const N_STEPS: usize = 10;
+        dbg(format!(
+            "running Nova folding scheme on EthDosCircuit, with N_STEPS={}",
+            N_STEPS
+        ));
+
+        let mut rng = OsRng;
+        let poseidon_config = poseidon_canonical_config::<Fr>();
+
+        let pks_sigs =
+            gen_signatures::<OsRng, EdwardsProjective>(&mut rng, &poseidon_config, N_STEPS);
+
+        // set the initial state
+        let xy = pks_sigs[0].pk.0.xy().unwrap();
+        let pk0 = vec![xy.0, xy.1];
+        let z_0: Vec<Fr> = vec![pk0.clone(), pk0, vec![Fr::zero()]].concat();
+
+        type FC = EthDosCircuit<Fr, EdwardsProjective, EdwardsVar>;
+        let f_circuit = FC::new(poseidon_config.clone()).unwrap();
+
+        // define type aliases for the FoldingScheme (FS) and Decider (D), to avoid writting the
+        // whole type each time
+        pub type FS = Nova<G1, G2, FC, Pedersen<G1>, Pedersen<G2>, false>;
+
+        // prepare the Nova prover & verifier params
+        let nova_preprocess_params =
+            PreprocessorParam::new(poseidon_config.clone(), f_circuit.clone());
+        let start = get_time();
+        let nova_params = FS::preprocess(&mut rng, &nova_preprocess_params).unwrap();
+        dbg(format!("Nova params generated: {:?}", elapsed(start)));
+
+        // initialize the folding scheme engine, in our case we use Nova
+        let mut nova = FS::init(&nova_params, f_circuit, z_0.clone()).unwrap();
+
+        // run n steps of the folding iteration
+        let start_full = get_time();
+        for i in 0..N_STEPS {
+            let start = get_time();
+            nova.prove_step(rng, pks_sigs[i].clone(), None).unwrap();
+            dbg(format!("Nova::prove_step {}: {:?}", nova.i, elapsed(start)));
+        }
+        dbg(format!(
+            "Nova's all {} steps time: {:?}",
+            N_STEPS,
+            elapsed(start_full)
+        ));
+
+        // verify the last IVC proof
+        let ivc_proof = nova.ivc_proof();
+        dbg!(&ivc_proof.z_i);
+        FS::verify(
+            nova_params.1.clone(), // Nova's verifier params
+            ivc_proof,
+        )
+        .unwrap();
+    }
+}

src/signature.rs

@@ -8,7 +8,7 @@ use ark_r1cs_std::alloc::{AllocVar, AllocationMode};
 use ark_r1cs_std::boolean::Boolean;
 use ark_r1cs_std::prelude::CurveVar;
 use ark_relations::r1cs::{Namespace, SynthesisError};
-use ark_serialize::{CanonicalDeserialize, CanonicalSerialize};
+use ark_serialize::CanonicalSerialize;
 use ark_std::{rand::Rng, Zero};
 use core::borrow::Borrow;
 use rand_core::CryptoRngCore;