jf_plonk/proof_system/
mod.rs

1// Copyright (c) 2022 Espresso Systems (espressosys.com)
2// This file is part of the Jellyfish library.
3
4// You should have received a copy of the MIT License
5// along with the Jellyfish library. If not, see <https://mit-license.org/>.
6
7//! Interfaces for Plonk-based proof systems
8use ark_ec::pairing::Pairing;
9use ark_std::{
10    error::Error,
11    fmt::Debug,
12    rand::{CryptoRng, RngCore},
13    vec::Vec,
14};
15use jf_relation::Arithmetization;
16pub mod batch_arg;
17pub(crate) mod prover;
18pub(crate) mod snark;
19pub mod structs;
20pub(crate) mod verifier;
21use crate::transcript::PlonkTranscript;
22pub use snark::PlonkKzgSnark;
23
24// TODO: (alex) should we name it `PlonkishSNARK` instead? since we use
25// `PlonkTranscript` on prove and verify.
26/// An interface for SNARKs with universal setup.
27pub trait UniversalSNARK<E: Pairing> {
28    /// The SNARK proof computed by the prover.
29    type Proof: Clone;
30
31    /// The parameters required by the prover to compute a proof for a specific
32    /// circuit.
33    type ProvingKey: Clone;
34
35    /// The parameters required by the verifier to validate a proof for a
36    /// specific circuit.
37    type VerifyingKey: Clone;
38
39    /// Universal Structured Reference String from `universal_setup`, used for
40    /// all subsequent circuit-specific preprocessing
41    type UniversalSRS: Clone + Debug;
42
43    /// SNARK related error
44    type Error: 'static + Error;
45
46    /// Generate the universal SRS for the argument system.
47    /// This setup is for trusted party to run, and mostly only used for
48    /// testing purpose. In practice, a MPC flavor of the setup will be carried
49    /// out to have higher assurance on the "toxic waste"/trapdoor being thrown
50    /// away to ensure soundness of the argument system.
51    fn universal_setup<R: RngCore + CryptoRng>(
52        _max_degree: usize,
53        _rng: &mut R,
54    ) -> Result<Self::UniversalSRS, Self::Error> {
55        unimplemented!("Should load from files in practice.");
56    }
57
58    /// Same as `universal_setup`, but for testing and benchmarking code only.
59    /// Insecure local generation for trusted setup! Don't use in production!
60    #[cfg(any(test, feature = "test-srs"))]
61    fn universal_setup_for_testing<R: RngCore + CryptoRng>(
62        _max_degree: usize,
63        _rng: &mut R,
64    ) -> Result<Self::UniversalSRS, Self::Error>;
65
66    /// Circuit-specific preprocessing to compute the proving/verifying keys.
67    fn preprocess<C: Arithmetization<E::ScalarField>>(
68        srs: &Self::UniversalSRS,
69        circuit: &C,
70    ) -> Result<(Self::ProvingKey, Self::VerifyingKey), Self::Error>;
71
72    /// Compute a SNARK proof of a circuit `circuit`, using the corresponding
73    /// proving key `prove_key`. The witness used to
74    /// generate the proof can be obtained from `circuit`.
75    ///
76    /// `extra_transcript_init_msg` is the optional message to be
77    /// appended to the transcript during its initialization before obtaining
78    /// any challenges. This field allows application-specific data bound to the
79    /// resulting proof without any check on the data. It does not incur any
80    /// additional cost in proof size or prove time.
81    fn prove<C, R, T>(
82        rng: &mut R,
83        circuit: &C,
84        prove_key: &Self::ProvingKey,
85        extra_transcript_init_msg: Option<Vec<u8>>,
86    ) -> Result<Self::Proof, Self::Error>
87    where
88        C: Arithmetization<E::ScalarField>,
89        R: CryptoRng + RngCore,
90        T: PlonkTranscript<E::BaseField>;
91
92    /// Verify a SNARK proof `proof` of the circuit `circuit`, with respect to
93    /// the public input `pub_input`.
94    ///
95    /// `extra_transcript_init_msg`: refer to documentation of `prove`
96    fn verify<T: PlonkTranscript<E::BaseField>>(
97        verify_key: &Self::VerifyingKey,
98        public_input: &[E::ScalarField],
99        proof: &Self::Proof,
100        extra_transcript_init_msg: Option<Vec<u8>>,
101    ) -> Result<(), Self::Error>;
102}
jf_plonk/proof_system/mod.rs

jf_plonk/proof_system/
mod.rs
