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If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. \ No newline at end of file diff --git a/README.md b/README.md new file mode 100644 index 0000000..d3c19de --- /dev/null +++ b/README.md @@ -0,0 +1,11 @@ +# Plonky2 Verifier + +[![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0) + +> A verifier for [plonky2](https://github.com/0xPolygonZero/plonky2/) proofs. + +This rust crate provides functionality to deserialize and verify proof, public inputs and verification key. + +## License + +This code is released under the GPL 3.0 license. \ No newline at end of file diff --git a/rust-toolchain b/rust-toolchain new file mode 100644 index 0000000..07ade69 --- /dev/null +++ b/rust-toolchain @@ -0,0 +1 @@ +nightly \ No newline at end of file diff --git a/src/deserializer.rs b/src/deserializer.rs new file mode 100644 index 0000000..f373128 --- /dev/null +++ b/src/deserializer.rs @@ -0,0 +1,49 @@ +use plonky2::field::extension::Extendable; +use plonky2::hash::hash_types::RichField; +use plonky2::plonk::circuit_data::{CommonCircuitData, VerifierCircuitData}; +use plonky2::plonk::config::GenericConfig; +use plonky2::plonk::proof::ProofWithPublicInputs; +use plonky2::util::serialization::GateSerializer; + +use alloc::vec::Vec; +use snafu::Snafu; + +/// Deserialization error. +#[derive(Debug, Snafu)] +pub enum DeserializeError { + /// Invalid proof or public inputs. + #[snafu(display("Invalid proof or public inputs for deserialization"))] + InvalidProof, + /// Invalid verification key. + #[snafu(display("Invalid verification key for deserialization"))] + InvalidVerificationKey, +} + +pub(crate) fn deserialize_vk( + vk: &[u8], + gs: &dyn GateSerializer, +) -> Result, DeserializeError> +where + F: RichField + Extendable, + C: GenericConfig, +{ + VerifierCircuitData::::from_bytes(Vec::from(vk), gs) + .map_err(|_| DeserializeError::InvalidVerificationKey) +} + +pub(crate) fn deserialize_proof_with_pubs( + proof: &[u8], + pubs: &[u8], + common_data: &CommonCircuitData, +) -> Result, DeserializeError> +where + F: RichField + Extendable, + C: GenericConfig, +{ + let mut bytes = Vec::with_capacity(proof.len() + pubs.len()); + bytes.extend_from_slice(proof); + bytes.extend_from_slice(pubs); + + ProofWithPublicInputs::::from_bytes(bytes, common_data) + .map_err(|_| DeserializeError::InvalidProof) +} diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..00b9140 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,61 @@ +#![no_std] +#![doc = include_str!("../README.md")] +#![deny(missing_docs)] + +extern crate alloc; + +mod deserializer; + +use deserializer::{deserialize_proof_with_pubs, deserialize_vk}; + +use plonky2::field::extension::Extendable; +use plonky2::hash::hash_types::RichField; +use plonky2::plonk::config::GenericConfig; +use plonky2::util::serialization::GateSerializer; +use snafu::Snafu; + +pub use deserializer::DeserializeError; + +/// Verification error. +#[derive(Debug, Snafu)] +pub enum VerifyError { + /// Invalid data. + #[snafu(display("Invalid data for verification: [{}]", cause))] + InvalidData { + /// Internal error. + #[snafu(source)] + cause: DeserializeError, + }, + /// Failure. + #[snafu(display("Failed to verify"))] + Failure, +} + +impl From for VerifyError { + fn from(value: DeserializeError) -> Self { + VerifyError::InvalidData { cause: value } + } +} + +/// Verify the given proof `proof` and public inputs `pubs` using verification key `vk`. +/// Use the given verification key `vk` to verify the proof `proof` against the public inputs `pubs`. +/// Can fail if: +/// - the proof, the pubs or the vk are not deserializable respectively as a `plonky2::plonk::proof::Proof`, +/// a `plonky2::hash::hash_types::RichField + plonky2_field::extension::Extendable` +/// and `plonky2::plonk::circuit_data::VerifierCircuitData`. +/// - the proof is not valid. +pub fn verify( + vk: &[u8], + proof: &[u8], + pubs: &[u8], + gs: &dyn GateSerializer, +) -> Result<(), VerifyError> +where + F: RichField + Extendable, + C: GenericConfig, +{ + let vk = deserialize_vk::(vk, gs)?; + let proof = deserialize_proof_with_pubs::(proof, pubs, &vk.common)?; + + vk.verify(proof).map_err(|_| VerifyError::Failure) +} diff --git a/tests/artifacts/proof.bin b/tests/artifacts/proof.bin new file mode 100644 index 0000000..dd3f1d2 Binary files /dev/null and b/tests/artifacts/proof.bin differ diff --git a/tests/artifacts/pubs.bin b/tests/artifacts/pubs.bin new file mode 100644 index 0000000..31a33dd Binary files /dev/null and b/tests/artifacts/pubs.bin differ diff --git a/tests/artifacts/vk.bin b/tests/artifacts/vk.bin new file mode 100644 index 0000000..a767c2f Binary files /dev/null and b/tests/artifacts/vk.bin differ diff --git a/tests/artifacts_generator.rs b/tests/artifacts_generator.rs new file mode 100644 index 0000000..703541c --- /dev/null +++ b/tests/artifacts_generator.rs @@ -0,0 +1,71 @@ +use std::fs; + +use plonky2::field::types::Field; +use plonky2::iop::witness::{PartialWitness, WitnessWrite}; +use plonky2::plonk::circuit_builder::CircuitBuilder; +use plonky2::plonk::circuit_data::CircuitConfig; +use plonky2::plonk::config::{GenericConfig, PoseidonGoldilocksConfig}; +use plonky2::util::serialization::{DefaultGateSerializer, Write}; + +/// An example of using Plonky2 to prove a statement of the form +/// "I know the 100th element of the Fibonacci sequence, starting with constants a and b." +/// When a == 0 and b == 1, this is proving knowledge of the 100th (standard) Fibonacci number. +/// This example also serializes the proof, public inputs and vk to files. +pub fn gen_factorial() { + const D: usize = 2; + type C = PoseidonGoldilocksConfig; + type F = >::F; + + let config = CircuitConfig::standard_recursion_config(); + let mut builder = CircuitBuilder::::new(config); + + // The arithmetic circuit. + let initial_a = builder.add_virtual_target(); + let initial_b = builder.add_virtual_target(); + let mut prev_target = initial_a; + let mut cur_target = initial_b; + for _ in 0..99 { + let temp = builder.add(prev_target, cur_target); + prev_target = cur_target; + cur_target = temp; + } + + // Public inputs are the two initial values (provided below) and the result (which is valid). + builder.register_public_input(initial_a); + builder.register_public_input(initial_b); + builder.register_public_input(cur_target); + + // Provide initial values. + let mut pw = PartialWitness::new(); + pw.set_target(initial_a, F::ZERO); + pw.set_target(initial_b, F::ONE); + + let data = builder.build::(); + + let proof = data.prove(pw).unwrap(); + + let mut proof_bytes = Vec::new(); + proof_bytes.write_proof(&proof.proof).unwrap(); + + let mut pubs_bytes = Vec::new(); + pubs_bytes.write_usize(proof.public_inputs.len()).unwrap(); + pubs_bytes + .write_field_vec(proof.public_inputs.as_slice()) + .unwrap(); + + let vk_bytes = data + .verifier_data() + .to_bytes(&DefaultGateSerializer) + .unwrap(); + + fs::write("tests/artifacts/vk.bin", vk_bytes).unwrap(); + fs::write("tests/artifacts/proof.bin", proof_bytes).unwrap(); + fs::write("tests/artifacts/pubs.bin", pubs_bytes).unwrap(); + + println!( + "100th Fibonacci number mod |F| (starting with {}, {}) is: {}", + proof.public_inputs[0], proof.public_inputs[1], proof.public_inputs[2] + ); + + data.verify(proof).unwrap() +} diff --git a/tests/integration.rs b/tests/integration.rs new file mode 100644 index 0000000..81d5c22 --- /dev/null +++ b/tests/integration.rs @@ -0,0 +1,64 @@ +#[path = "artifacts_generator.rs"] +mod artifacts_generator; + +use plonky2::plonk::config::{GenericConfig, PoseidonGoldilocksConfig}; +use plonky2::util::serialization::DefaultGateSerializer; +use plonky2_verifier::{verify, DeserializeError, VerifyError}; + +fn load_data() -> (Vec, Vec, Vec) { + // Ensure artifacts exist by running `gen_factorial` only if needed + if !std::path::Path::new("tests/artifacts/proof.bin").exists() || + !std::path::Path::new("tests/artifacts/pubs.bin").exists() || + !std::path::Path::new("tests/artifacts/vk.bin").exists() + { + println!("Generating artifacts..."); + artifacts_generator::gen_factorial(); + } + let proof = std::fs::read("tests/artifacts/proof.bin").unwrap(); + let pubs = std::fs::read("tests/artifacts/pubs.bin").unwrap(); + let vk = std::fs::read("tests/artifacts/vk.bin").unwrap(); + + (vk, proof, pubs) +} + +fn verify_non_generic(vk: &Vec, proof: &Vec, pubs: &Vec) -> Result<(), VerifyError> { + const D: usize = 2; + type C = PoseidonGoldilocksConfig; + type F = >::F; + + verify::(vk.as_slice(), proof.as_slice(), pubs.as_slice(), &DefaultGateSerializer) +} + +#[test] +fn should_verify_valid_proof() { + let (vk, proof, pubs) = load_data(); + + assert!(verify_non_generic(&vk, &proof, &pubs).is_ok()); +} + +#[test] +fn should_not_deserialize_invalid_pubs() { + let (vk, proof, mut pubs) = load_data(); + + pubs[0] = pubs.first().unwrap().wrapping_add(1); + + assert!(matches!( + verify_non_generic(&vk, &proof, &pubs), + Err(VerifyError::InvalidData { + cause: DeserializeError::InvalidProof + }) + )); +} + +#[test] +fn should_not_verify_false_proof() { + let (vk, proof, mut pubs) = load_data(); + + let len = pubs.len(); + pubs[len - 1] = pubs.last().unwrap().wrapping_add(1); + + assert!(matches!( + verify_non_generic(&vk, &proof, &pubs), + Err(VerifyError::Failure { .. }) + )); +} \ No newline at end of file