README.md

snark-bn254-verifier

The snark-bn254-verifier crate is used for verifying Groth16 and PlonK proofs on the Bn254 curve, ensuring compatibility with proofs generated by the gnark library. One can save proofs and verification keys from gnark and subsequently load them to this library for verifying the proofs with ease.

How to save proofs and verification keys from gnark

To save the proof and verification key from gnark, one can use the following code snippet:

// Write the verifier key.
vkFile, err := os.Create("plonk_vk.bin") // or "groth16_vk.bin"
if err != nil {
    panic(err)
}
defer vkFile.Close()
_, err = vk.WriteTo(vkFile)
if err != nil {
    panic(err)
}

// Write the proving key.
proofFile, err := os.Create("proof.bin")
if err != nil {
    panic(err)
}
defer proofFile.Close()
_, err = proof.WriteTo(proofFile)
if err != nil {
    panic(err)
}

Usage

To use this library, add it as a dependency in your Cargo.toml:

[dependencies]
snark-bn254-verifier = { git = "https://github.com/succinctlabs/snark-bn254-verifier" }

Then, you can verify a proof by calling the verify function:

use snark_bn254_verifier::{verify, ProvingSystem, Fr};

fn main() {

    let proof = std::fs::read("proof.bin").unwrap();
    let vk = std::fs::read("vk.bin").unwrap();

    match PlonkVerifier::verify(&proof, &vk, &[vkey_hash, committed_values_digest]) {
        Ok(true) => {
            println!("Proof is valid");
        }
        Ok(false) | Err(_) => {
            println!("Proof is invalid");
            panic!();
        }
    }
}

Features

• Verification of Groth16 and PlonK proofs generated using gnark or sp1 on the Bn254 curve.
• Easy integration into Rust projects.