735 lines
24 KiB
Rust
735 lines
24 KiB
Rust
extern crate bellman;
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extern crate pairing;
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extern crate rand;
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extern crate ff;
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// For randomness (during paramgen and proof generation)
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use rand::{thread_rng, Rng};
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// For benchmarking
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use std::time::{Duration, Instant};
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// Bring in some tools for using pairing-friendly curves
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use pairing::{
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Engine
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};
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use ff::{
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Field,
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};
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// We're going to use the BLS12-381 pairing-friendly elliptic curve.
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use pairing::bls12_381::{
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Bls12
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};
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use pairing::bn256::{
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Bn256
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};
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// We'll use these interfaces to construct our circuit.
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use bellman::{
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Circuit,
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ConstraintSystem,
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SynthesisError
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};
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// We're going to use the Groth16 proving system.
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use bellman::groth16::{
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Proof,
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generate_random_parameters,
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prepare_verifying_key,
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create_random_proof,
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verify_proof,
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};
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const MIMC_ROUNDS: usize = 322;
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/// This is an implementation of MiMC, specifically a
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/// variant named `LongsightF322p3` for BLS12-381.
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/// See http://eprint.iacr.org/2016/492 for more
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/// information about this construction.
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///
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/// ```
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/// function LongsightF322p3(xL ⦂ Fp, xR ⦂ Fp) {
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/// for i from 0 up to 321 {
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/// xL, xR := xR + (xL + Ci)^3, xL
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/// }
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/// return xL
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/// }
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/// ```
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fn mimc<E: Engine>(
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mut xl: E::Fr,
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mut xr: E::Fr,
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constants: &[E::Fr]
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) -> E::Fr
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{
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assert_eq!(constants.len(), MIMC_ROUNDS);
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for i in 0..MIMC_ROUNDS {
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let mut tmp1 = xl;
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tmp1.add_assign(&constants[i]);
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let mut tmp2 = tmp1;
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tmp2.square();
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tmp2.mul_assign(&tmp1);
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tmp2.add_assign(&xr);
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xr = xl;
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xl = tmp2;
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}
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xl
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}
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/// This is our demo circuit for proving knowledge of the
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/// preimage of a MiMC hash invocation.
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#[derive(Clone)]
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struct MiMCDemo<'a, E: Engine> {
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xl: Option<E::Fr>,
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xr: Option<E::Fr>,
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constants: &'a [E::Fr]
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}
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/// Our demo circuit implements this `Circuit` trait which
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/// is used during paramgen and proving in order to
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/// synthesize the constraint system.
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impl<'a, E: Engine> Circuit<E> for MiMCDemo<'a, E> {
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fn synthesize<CS: ConstraintSystem<E>>(
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self,
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cs: &mut CS
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) -> Result<(), SynthesisError>
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{
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assert_eq!(self.constants.len(), MIMC_ROUNDS);
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// Allocate the first component of the preimage.
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let mut xl_value = self.xl;
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let mut xl = cs.alloc(|| "preimage xl", || {
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xl_value.ok_or(SynthesisError::AssignmentMissing)
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})?;
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// Allocate the second component of the preimage.
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let mut xr_value = self.xr;
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let mut xr = cs.alloc(|| "preimage xr", || {
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xr_value.ok_or(SynthesisError::AssignmentMissing)
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})?;
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for i in 0..MIMC_ROUNDS {
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// xL, xR := xR + (xL + Ci)^3, xL
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let cs = &mut cs.namespace(|| format!("round {}", i));
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// tmp = (xL + Ci)^2
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let mut tmp_value = xl_value.map(|mut e| {
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e.add_assign(&self.constants[i]);
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e.square();
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e
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});
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let mut tmp = cs.alloc(|| "tmp", || {
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tmp_value.ok_or(SynthesisError::AssignmentMissing)
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})?;
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cs.enforce(
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|| "tmp = (xL + Ci)^2",
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|lc| lc + xl + (self.constants[i], CS::one()),
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|lc| lc + xl + (self.constants[i], CS::one()),
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|lc| lc + tmp
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);
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// new_xL = xR + (xL + Ci)^3
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// new_xL = xR + tmp * (xL + Ci)
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// new_xL - xR = tmp * (xL + Ci)
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let mut new_xl_value = xl_value.map(|mut e| {
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e.add_assign(&self.constants[i]);
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e.mul_assign(&tmp_value.unwrap());
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e.add_assign(&xr_value.unwrap());
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e
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});
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let mut new_xl = if i == (MIMC_ROUNDS-1) {
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// This is the last round, xL is our image and so
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// we allocate a public input.
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cs.alloc_input(|| "image", || {
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new_xl_value.ok_or(SynthesisError::AssignmentMissing)
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})?
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} else {
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cs.alloc(|| "new_xl", || {
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new_xl_value.ok_or(SynthesisError::AssignmentMissing)
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})?
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};
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cs.enforce(
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|| "new_xL = xR + (xL + Ci)^3",
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|lc| lc + tmp,
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|lc| lc + xl + (self.constants[i], CS::one()),
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|lc| lc + new_xl - xr
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);
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// xR = xL
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xr = xl;
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xr_value = xl_value;
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// xL = new_xL
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xl = new_xl;
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xl_value = new_xl_value;
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}
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Ok(())
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}
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}
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#[test]
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fn test_mimc() {
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// This may not be cryptographically safe, use
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// `OsRng` (for example) in production software.
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let rng = &mut thread_rng();
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// Generate the MiMC round constants
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let constants = (0..MIMC_ROUNDS).map(|_| rng.gen()).collect::<Vec<_>>();
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println!("Creating parameters...");
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// Create parameters for our circuit
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let params = {
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let c = MiMCDemo::<Bls12> {
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xl: None,
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xr: None,
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constants: &constants
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};
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generate_random_parameters(c, rng).unwrap()
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};
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// Prepare the verification key (for proof verification)
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let pvk = prepare_verifying_key(¶ms.vk);
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println!("Creating proofs...");
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// Let's benchmark stuff!
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const SAMPLES: u32 = 50;
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let mut total_proving = Duration::new(0, 0);
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let mut total_verifying = Duration::new(0, 0);
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// Just a place to put the proof data, so we can
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// benchmark deserialization.
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let mut proof_vec = vec![];
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for _ in 0..SAMPLES {
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// Generate a random preimage and compute the image
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let xl = rng.gen();
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let xr = rng.gen();
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let image = mimc::<Bls12>(xl, xr, &constants);
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proof_vec.truncate(0);
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let start = Instant::now();
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{
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// Create an instance of our circuit (with the
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// witness)
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let c = MiMCDemo {
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xl: Some(xl),
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xr: Some(xr),
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constants: &constants
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};
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// Create a groth16 proof with our parameters.
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let proof = create_random_proof(c, ¶ms, rng).unwrap();
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proof.write(&mut proof_vec).unwrap();
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}
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total_proving += start.elapsed();
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let start = Instant::now();
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let proof = Proof::read(&proof_vec[..]).unwrap();
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// Check the proof
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assert!(verify_proof(
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&pvk,
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&proof,
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&[image]
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).unwrap());
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total_verifying += start.elapsed();
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}
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let proving_avg = total_proving / SAMPLES;
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let proving_avg = proving_avg.subsec_nanos() as f64 / 1_000_000_000f64
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+ (proving_avg.as_secs() as f64);
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let verifying_avg = total_verifying / SAMPLES;
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let verifying_avg = verifying_avg.subsec_nanos() as f64 / 1_000_000_000f64
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+ (verifying_avg.as_secs() as f64);
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println!("Average proving time: {:?} seconds", proving_avg);
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println!("Average verifying time: {:?} seconds", verifying_avg);
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}
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#[test]
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fn test_mimc_bn256() {
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// This may not be cryptographically safe, use
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// `OsRng` (for example) in production software.
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let rng = &mut thread_rng();
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// Generate the MiMC round constants
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let constants = (0..MIMC_ROUNDS).map(|_| rng.gen()).collect::<Vec<_>>();
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println!("Creating parameters...");
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// Create parameters for our circuit
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let params = {
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let c = MiMCDemo::<Bn256> {
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xl: None,
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xr: None,
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constants: &constants
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};
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generate_random_parameters(c, rng).unwrap()
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};
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// Prepare the verification key (for proof verification)
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let pvk = prepare_verifying_key(¶ms.vk);
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println!("Creating proofs...");
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// Let's benchmark stuff!
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const SAMPLES: u32 = 50;
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let mut total_proving = Duration::new(0, 0);
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let mut total_verifying = Duration::new(0, 0);
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// Just a place to put the proof data, so we can
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// benchmark deserialization.
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let mut proof_vec = vec![];
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for _ in 0..SAMPLES {
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// Generate a random preimage and compute the image
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let xl = rng.gen();
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let xr = rng.gen();
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let image = mimc::<Bn256>(xl, xr, &constants);
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proof_vec.truncate(0);
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let start = Instant::now();
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{
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// Create an instance of our circuit (with the
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// witness)
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let c = MiMCDemo {
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xl: Some(xl),
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xr: Some(xr),
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constants: &constants
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};
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// Create a groth16 proof with our parameters.
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let proof = create_random_proof(c, ¶ms, rng).unwrap();
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proof.write(&mut proof_vec).unwrap();
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}
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total_proving += start.elapsed();
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let start = Instant::now();
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let proof = Proof::read(&proof_vec[..]).unwrap();
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// Check the proof
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assert!(verify_proof(
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&pvk,
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&proof,
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&[image]
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).unwrap());
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total_verifying += start.elapsed();
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}
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let proving_avg = total_proving / SAMPLES;
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let proving_avg = proving_avg.subsec_nanos() as f64 / 1_000_000_000f64
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+ (proving_avg.as_secs() as f64);
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let verifying_avg = total_verifying / SAMPLES;
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let verifying_avg = verifying_avg.subsec_nanos() as f64 / 1_000_000_000f64
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+ (verifying_avg.as_secs() as f64);
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println!("Average proving time: {:?} seconds", proving_avg);
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println!("Average verifying time: {:?} seconds", verifying_avg);
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}
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/// This is our demo circuit for proving knowledge of the
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/// preimage of a MiMC hash invocation.
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#[derive(Clone)]
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struct MiMCDemoNoInputs<'a, E: Engine> {
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xl: Option<E::Fr>,
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xr: Option<E::Fr>,
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image: Option<E::Fr>,
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constants: &'a [E::Fr]
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}
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/// Our demo circuit implements this `Circuit` trait which
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/// is used during paramgen and proving in order to
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/// synthesize the constraint system.
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impl<'a, E: Engine> Circuit<E> for MiMCDemoNoInputs<'a, E> {
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fn synthesize<CS: ConstraintSystem<E>>(
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self,
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cs: &mut CS
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) -> Result<(), SynthesisError>
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{
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assert_eq!(self.constants.len(), MIMC_ROUNDS);
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// Allocate the first component of the preimage.
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let mut xl_value = self.xl;
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let mut xl = cs.alloc(|| "preimage xl", || {
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xl_value.ok_or(SynthesisError::AssignmentMissing)
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})?;
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// Allocate the second component of the preimage.
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let mut xr_value = self.xr;
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let mut xr = cs.alloc(|| "preimage xr", || {
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xr_value.ok_or(SynthesisError::AssignmentMissing)
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})?;
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for i in 0..MIMC_ROUNDS {
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// xL, xR := xR + (xL + Ci)^3, xL
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let cs = &mut cs.namespace(|| format!("round {}", i));
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// tmp = (xL + Ci)^2
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let mut tmp_value = xl_value.map(|mut e| {
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e.add_assign(&self.constants[i]);
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e.square();
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e
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});
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let mut tmp = cs.alloc(|| "tmp", || {
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tmp_value.ok_or(SynthesisError::AssignmentMissing)
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})?;
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cs.enforce(
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|| "tmp = (xL + Ci)^2",
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|lc| lc + xl + (self.constants[i], CS::one()),
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|lc| lc + xl + (self.constants[i], CS::one()),
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|lc| lc + tmp
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);
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// new_xL = xR + (xL + Ci)^3
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// new_xL = xR + tmp * (xL + Ci)
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// new_xL - xR = tmp * (xL + Ci)
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let mut new_xl_value = xl_value.map(|mut e| {
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e.add_assign(&self.constants[i]);
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e.mul_assign(&tmp_value.unwrap());
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e.add_assign(&xr_value.unwrap());
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e
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});
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let mut new_xl = if i == (MIMC_ROUNDS-1) {
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// This is the last round, xL is our image and so
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// we use the image
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let image_value = self.image;
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cs.alloc(|| "image", || {
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image_value.ok_or(SynthesisError::AssignmentMissing)
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})?
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} else {
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cs.alloc(|| "new_xl", || {
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new_xl_value.ok_or(SynthesisError::AssignmentMissing)
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})?
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};
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cs.enforce(
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|| "new_xL = xR + (xL + Ci)^3",
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|lc| lc + tmp,
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|lc| lc + xl + (self.constants[i], CS::one()),
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|lc| lc + new_xl - xr
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);
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// xR = xL
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xr = xl;
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xr_value = xl_value;
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// xL = new_xL
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xl = new_xl;
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xl_value = new_xl_value;
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}
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Ok(())
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}
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}
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#[test]
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fn test_sonic_mimc() {
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use ff::{Field, PrimeField};
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use pairing::{Engine, CurveAffine, CurveProjective};
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use pairing::bls12_381::{Bls12, Fr};
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use std::time::{Instant};
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use bellman::sonic::srs::SRS;
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let srs_x = Fr::from_str("23923").unwrap();
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let srs_alpha = Fr::from_str("23728792").unwrap();
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println!("making srs");
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let start = Instant::now();
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let srs = SRS::<Bls12>::dummy(830564, srs_x, srs_alpha);
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println!("done in {:?}", start.elapsed());
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{
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// This may not be cryptographically safe, use
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// `OsRng` (for example) in production software.
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let rng = &mut thread_rng();
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// Generate the MiMC round constants
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let constants = (0..MIMC_ROUNDS).map(|_| rng.gen()).collect::<Vec<_>>();
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let samples: usize = 100;
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let xl = rng.gen();
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let xr = rng.gen();
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let image = mimc::<Bls12>(xl, xr, &constants);
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// Create an instance of our circuit (with the
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// witness)
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let circuit = MiMCDemoNoInputs {
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xl: Some(xl),
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xr: Some(xr),
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image: Some(image),
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constants: &constants
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};
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use bellman::sonic::cs::Basic;
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use bellman::sonic::sonic::AdaptorCircuit;
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use bellman::sonic::helped::prover::{create_advice_on_srs, create_proof_on_srs};
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use bellman::sonic::helped::{MultiVerifier, get_circuit_parameters};
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use bellman::sonic::helped::helper::{create_aggregate_on_srs};
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println!("creating proof");
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let start = Instant::now();
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let proof = create_proof_on_srs::<Bls12, _, Basic>(&AdaptorCircuit(circuit.clone()), &srs).unwrap();
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println!("done in {:?}", start.elapsed());
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println!("creating advice");
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let start = Instant::now();
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let advice = create_advice_on_srs::<Bls12, _, Basic>(&AdaptorCircuit(circuit.clone()), &proof, &srs).unwrap();
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println!("done in {:?}", start.elapsed());
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println!("creating aggregate for {} proofs", samples);
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let start = Instant::now();
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let proofs: Vec<_> = (0..samples).map(|_| (proof.clone(), advice.clone())).collect();
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let aggregate = create_aggregate_on_srs::<Bls12, _, Basic>(&AdaptorCircuit(circuit.clone()), &proofs, &srs);
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println!("done in {:?}", start.elapsed());
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{
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let rng = thread_rng();
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let mut verifier = MultiVerifier::<Bls12, _, Basic, _>::new(AdaptorCircuit(circuit.clone()), &srs, rng).unwrap();
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println!("verifying 1 proof without advice");
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let start = Instant::now();
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{
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for _ in 0..1 {
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verifier.add_proof(&proof, &[], |_, _| None);
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}
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assert_eq!(verifier.check_all(), true); // TODO
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}
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println!("done in {:?}", start.elapsed());
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}
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{
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let rng = thread_rng();
|
|
let mut verifier = MultiVerifier::<Bls12, _, Basic, _>::new(AdaptorCircuit(circuit.clone()), &srs, rng).unwrap();
|
|
println!("verifying {} proofs without advice", samples);
|
|
let start = Instant::now();
|
|
{
|
|
for _ in 0..samples {
|
|
verifier.add_proof(&proof, &[], |_, _| None);
|
|
}
|
|
assert_eq!(verifier.check_all(), true); // TODO
|
|
}
|
|
println!("done in {:?}", start.elapsed());
|
|
}
|
|
|
|
{
|
|
let rng = thread_rng();
|
|
let mut verifier = MultiVerifier::<Bls12, _, Basic, _>::new(AdaptorCircuit(circuit.clone()), &srs, rng).unwrap();
|
|
println!("verifying 100 proofs with advice");
|
|
let start = Instant::now();
|
|
{
|
|
for (ref proof, ref advice) in &proofs {
|
|
verifier.add_proof_with_advice(proof, &[], advice);
|
|
}
|
|
verifier.add_aggregate(&proofs, &aggregate);
|
|
assert_eq!(verifier.check_all(), true); // TODO
|
|
}
|
|
println!("done in {:?}", start.elapsed());
|
|
}
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_inputs_into_sonic_mimc() {
|
|
use ff::{Field, PrimeField};
|
|
use pairing::{Engine, CurveAffine, CurveProjective};
|
|
use pairing::bn256::{Bn256, Fr};
|
|
// use pairing::bls12_381::{Bls12, Fr};
|
|
use std::time::{Instant};
|
|
use bellman::sonic::srs::SRS;
|
|
|
|
let srs_x = Fr::from_str("23923").unwrap();
|
|
let srs_alpha = Fr::from_str("23728792").unwrap();
|
|
println!("making srs");
|
|
let start = Instant::now();
|
|
let srs = SRS::<Bn256>::dummy(830564, srs_x, srs_alpha);
|
|
println!("done in {:?}", start.elapsed());
|
|
|
|
{
|
|
// This may not be cryptographically safe, use
|
|
// `OsRng` (for example) in production software.
|
|
let rng = &mut thread_rng();
|
|
|
|
// Generate the MiMC round constants
|
|
let constants = (0..MIMC_ROUNDS).map(|_| rng.gen()).collect::<Vec<_>>();
|
|
let samples: usize = 100;
|
|
|
|
let xl = rng.gen();
|
|
let xr = rng.gen();
|
|
let image = mimc::<Bn256>(xl, xr, &constants);
|
|
|
|
// Create an instance of our circuit (with the
|
|
// witness)
|
|
let circuit = MiMCDemo {
|
|
xl: Some(xl),
|
|
xr: Some(xr),
|
|
constants: &constants
|
|
};
|
|
|
|
use bellman::sonic::cs::Basic;
|
|
use bellman::sonic::sonic::AdaptorCircuit;
|
|
use bellman::sonic::helped::prover::{create_advice_on_srs, create_proof_on_srs};
|
|
use bellman::sonic::helped::{MultiVerifier, get_circuit_parameters};
|
|
use bellman::sonic::helped::helper::{create_aggregate_on_srs};
|
|
|
|
let info = get_circuit_parameters::<Bn256, _>(circuit.clone()).expect("Must get circuit info");
|
|
println!("{:?}", info);
|
|
|
|
println!("creating proof");
|
|
let start = Instant::now();
|
|
let proof = create_proof_on_srs::<Bn256, _, Basic>(&AdaptorCircuit(circuit.clone()), &srs).unwrap();
|
|
println!("done in {:?}", start.elapsed());
|
|
|
|
println!("creating advice");
|
|
let start = Instant::now();
|
|
let advice = create_advice_on_srs::<Bn256, _, Basic>(&AdaptorCircuit(circuit.clone()), &proof, &srs).unwrap();
|
|
println!("done in {:?}", start.elapsed());
|
|
|
|
println!("creating aggregate for {} proofs", samples);
|
|
let start = Instant::now();
|
|
let proofs: Vec<_> = (0..samples).map(|_| (proof.clone(), advice.clone())).collect();
|
|
let aggregate = create_aggregate_on_srs::<Bn256, _, Basic>(&AdaptorCircuit(circuit.clone()), &proofs, &srs);
|
|
println!("done in {:?}", start.elapsed());
|
|
|
|
{
|
|
let rng = thread_rng();
|
|
let mut verifier = MultiVerifier::<Bn256, _, Basic, _>::new(AdaptorCircuit(circuit.clone()), &srs, rng).unwrap();
|
|
println!("verifying 1 proof without advice");
|
|
let start = Instant::now();
|
|
{
|
|
for _ in 0..1 {
|
|
verifier.add_proof(&proof, &[image], |_, _| None);
|
|
}
|
|
assert_eq!(verifier.check_all(), true); // TODO
|
|
}
|
|
println!("done in {:?}", start.elapsed());
|
|
}
|
|
|
|
{
|
|
let rng = thread_rng();
|
|
let mut verifier = MultiVerifier::<Bn256, _, Basic, _>::new(AdaptorCircuit(circuit.clone()), &srs, rng).unwrap();
|
|
println!("verifying {} proofs without advice", samples);
|
|
let start = Instant::now();
|
|
{
|
|
for _ in 0..samples {
|
|
verifier.add_proof(&proof, &[image], |_, _| None);
|
|
}
|
|
assert_eq!(verifier.check_all(), true); // TODO
|
|
}
|
|
println!("done in {:?}", start.elapsed());
|
|
}
|
|
|
|
{
|
|
let rng = thread_rng();
|
|
let mut verifier = MultiVerifier::<Bn256, _, Basic, _>::new(AdaptorCircuit(circuit.clone()), &srs, rng).unwrap();
|
|
println!("verifying 100 proofs with advice and aggregate");
|
|
let start = Instant::now();
|
|
{
|
|
for (ref proof, ref advice) in &proofs {
|
|
verifier.add_proof_with_advice(proof, &[image], advice);
|
|
}
|
|
verifier.add_aggregate(&proofs, &aggregate);
|
|
assert_eq!(verifier.check_all(), true); // TODO
|
|
}
|
|
println!("done in {:?}", start.elapsed());
|
|
}
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn test_high_level_sonic_api() {
|
|
use pairing::bn256::{Bn256};
|
|
use std::time::{Instant};
|
|
use bellman::sonic::helped::{
|
|
generate_random_parameters,
|
|
verify_aggregate,
|
|
verify_proofs,
|
|
create_proof,
|
|
create_advice,
|
|
create_aggregate,
|
|
get_circuit_parameters
|
|
};
|
|
|
|
{
|
|
// This may not be cryptographically safe, use
|
|
// `OsRng` (for example) in production software.
|
|
let mut rng = &mut thread_rng();
|
|
|
|
// Generate the MiMC round constants
|
|
let constants = (0..MIMC_ROUNDS).map(|_| rng.gen()).collect::<Vec<_>>();
|
|
let samples: usize = 100;
|
|
|
|
let xl = rng.gen();
|
|
let xr = rng.gen();
|
|
let image = mimc::<Bn256>(xl, xr, &constants);
|
|
|
|
// Create an instance of our circuit (with the
|
|
// witness)
|
|
let circuit = MiMCDemo {
|
|
xl: Some(xl),
|
|
xr: Some(xr),
|
|
constants: &constants
|
|
};
|
|
|
|
let info = get_circuit_parameters::<Bn256, _>(circuit.clone()).expect("Must get circuit info");
|
|
println!("{:?}", info);
|
|
|
|
let params = generate_random_parameters(circuit.clone(), &mut rng).unwrap();
|
|
|
|
println!("creating proof");
|
|
let start = Instant::now();
|
|
let proof = create_proof(circuit.clone(), ¶ms).unwrap();
|
|
println!("done in {:?}", start.elapsed());
|
|
|
|
println!("creating advice");
|
|
let start = Instant::now();
|
|
let advice = create_advice(circuit.clone(), &proof, ¶ms).unwrap();
|
|
println!("done in {:?}", start.elapsed());
|
|
|
|
println!("creating aggregate for {} proofs", samples);
|
|
let start = Instant::now();
|
|
let proofs: Vec<_> = (0..samples).map(|_| (proof.clone(), advice.clone())).collect();
|
|
|
|
let aggregate = create_aggregate::<Bn256, _>(circuit.clone(), &proofs, ¶ms);
|
|
println!("done in {:?}", start.elapsed());
|
|
|
|
{
|
|
println!("verifying 1 proof without advice");
|
|
let rng = thread_rng();
|
|
let start = Instant::now();
|
|
assert_eq!(verify_proofs(&vec![proof.clone()], &vec![vec![image.clone()]], circuit.clone(), rng, ¶ms).unwrap(), true);
|
|
println!("done in {:?}", start.elapsed());
|
|
}
|
|
|
|
{
|
|
println!("verifying {} proofs without advice", samples);
|
|
let rng = thread_rng();
|
|
let start = Instant::now();
|
|
assert_eq!(verify_proofs(&vec![proof.clone(); 100], &vec![vec![image.clone()]; 100], circuit.clone(), rng, ¶ms).unwrap(), true);
|
|
println!("done in {:?}", start.elapsed());
|
|
}
|
|
|
|
{
|
|
println!("verifying 100 proofs with advice and aggregate");
|
|
let rng = thread_rng();
|
|
let start = Instant::now();
|
|
assert_eq!(verify_aggregate(&vec![(proof.clone(), advice.clone()); 100], &aggregate, &vec![vec![image.clone()]; 100], circuit.clone(), rng, ¶ms).unwrap(), true);
|
|
println!("done in {:?}", start.elapsed());
|
|
}
|
|
}
|
|
} |