Full flow example (#90)

* expose params & structs for external usage

* add full_flow example, move examples into 'examples' dir

examples/utils.rs

@@ -0,0 +1,49 @@
+#![allow(non_snake_case)]
+#![allow(non_upper_case_globals)]
+#![allow(non_camel_case_types)]
+#![allow(clippy::upper_case_acronyms)]
+#![allow(dead_code)]
+use ark_pallas::{constraints::GVar, Fr, Projective};
+use ark_vesta::{constraints::GVar as GVar2, Projective as Projective2};
+
+use folding_schemes::commitment::{pedersen::Pedersen, CommitmentScheme};
+use folding_schemes::folding::nova::{get_r1cs, ProverParams, VerifierParams};
+use folding_schemes::frontend::FCircuit;
+use folding_schemes::transcript::poseidon::poseidon_test_config;
+
+// This method computes the Nova's Prover & Verifier parameters for the example.
+// Warning: this method is only for testing purposes. For a real world use case those parameters
+// should be generated carefully (both the PoseidonConfig and the PedersenParams).
+#[allow(clippy::type_complexity)]
+pub(crate) fn test_nova_setup<FC: FCircuit<Fr>>(
+    F_circuit: FC,
+) -> (
+    ProverParams<Projective, Projective2, Pedersen<Projective>, Pedersen<Projective2>>,
+    VerifierParams<Projective, Projective2>,
+) {
+    let mut rng = ark_std::test_rng();
+    let poseidon_config = poseidon_test_config::<Fr>();
+
+    // get the CM & CF_CM len
+    let (r1cs, cf_r1cs) =
+        get_r1cs::<Projective, GVar, Projective2, GVar2, FC>(&poseidon_config, F_circuit).unwrap();
+    let cf_len = r1cs.A.n_rows;
+    let cf_cf_len = cf_r1cs.A.n_rows;
+
+    let (pedersen_params, _) = Pedersen::<Projective>::setup(&mut rng, cf_len).unwrap();
+    let (cf_pedersen_params, _) = Pedersen::<Projective2>::setup(&mut rng, cf_cf_len).unwrap();
+
+    let prover_params =
+        ProverParams::<Projective, Projective2, Pedersen<Projective>, Pedersen<Projective2>> {
+            poseidon_config: poseidon_config.clone(),
+            cs_params: pedersen_params,
+            cf_cs_params: cf_pedersen_params,
+        };
+    let verifier_params = VerifierParams::<Projective, Projective2> {
+        poseidon_config: poseidon_config.clone(),
+        r1cs,
+        cf_r1cs,
+    };
+    (prover_params, verifier_params)
+}
+fn main() {}