bellperson 0.27.0

zk-SNARK library
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147

//! Prover implementation implemented using SupraSeal (C++).

use std::time::Instant;

use bellpepper_core::{Circuit, ConstraintSystem, Index, SynthesisError, Variable};
use ff::{Field, PrimeField};
use log::info;
use pairing::MultiMillerLoop;
use rayon::iter::{IntoParallelIterator, ParallelIterator};

use super::{ParameterSource, Proof, ProvingAssignment};
use crate::{BELLMAN_VERSION, gpu::GpuName};

impl<Scalar> From<&ProvingAssignment<Scalar>> for supraseal_c2::Assignment<Scalar>
where
    Scalar: PrimeField,
{
    fn from(assignment: &ProvingAssignment<Scalar>) -> Self {
        assert_eq!(assignment.a.len(), assignment.b.len());
        assert_eq!(assignment.a.len(), assignment.c.len());

        Self {
            a_aux_density: assignment.a_aux_density.bv.as_raw_slice().as_ptr(),
            a_aux_bit_len: assignment.a_aux_density.bv.len(),
            a_aux_popcount: assignment.a_aux_density.get_total_density(),

            b_inp_density: assignment.b_input_density.bv.as_raw_slice().as_ptr(),
            b_inp_bit_len: assignment.b_input_density.bv.len(),
            b_inp_popcount: assignment.b_input_density.get_total_density(),

            b_aux_density: assignment.b_aux_density.bv.as_raw_slice().as_ptr(),
            b_aux_bit_len: assignment.b_aux_density.bv.len(),
            b_aux_popcount: assignment.b_aux_density.get_total_density(),

            a: assignment.a.as_ptr(),
            b: assignment.b.as_ptr(),
            c: assignment.c.as_ptr(),
            abc_size: assignment.a.len(),

            inp_assignment_data: assignment.input_assignment.as_ptr(),
            inp_assignment_size: assignment.input_assignment.len(),

            aux_assignment_data: assignment.aux_assignment.as_ptr(),
            aux_assignment_size: assignment.aux_assignment.len(),
        }
    }
}

#[allow(clippy::type_complexity)]
pub(super) fn create_proof_batch_priority_inner<E, C, P: ParameterSource<E>>(
    circuits: Vec<C>,
    params: P,
    randomization: Option<(Vec<E::Fr>, Vec<E::Fr>)>,
    _priority: bool,
) -> Result<Vec<Proof<E>>, SynthesisError>
where
    E: MultiMillerLoop,
    C: Circuit<E::Fr> + Send,
    E::Fr: GpuName,
    E::G1Affine: GpuName,
    E::G2Affine: GpuName,
{
    info!(
        "Bellperson {} with SupraSeal is being used!",
        BELLMAN_VERSION
    );

    let provers = synthesize_circuits_batch(circuits)?;

    // Start fft/multiexp prover timer
    let start = Instant::now();
    info!("starting proof timer");

    let num_circuits = provers.len();
    let (r_s, s_s) = randomization.unwrap_or((
        vec![E::Fr::ZERO; num_circuits],
        vec![E::Fr::ZERO; num_circuits],
    ));

    // Make sure all circuits have the same input len.
    for prover in &provers {
        assert_eq!(
            prover.a.len(),
            provers[0].a.len(),
            "only equaly sized circuits are supported"
        );
    }

    let provers_c2: Vec<supraseal_c2::Assignment<E::Fr>> =
        provers.iter().map(|p| p.into()).collect();

    let mut proofs: Vec<Proof<E>> = Vec::with_capacity(num_circuits);
    // We call out to C++ code which is unsafe anyway, hence silence this warning.
    #[allow(clippy::uninit_vec)]
    unsafe {
        proofs.set_len(num_circuits);
    }

    let srs = params.get_supraseal_srs().ok_or_else(|| {
        log::error!("SupraSeal SRS wasn't allocated correctly");
        SynthesisError::MalformedSrs
    })?;
    supraseal_c2::generate_groth16_proofs(
        provers_c2.as_slice(),
        r_s.as_slice(),
        s_s.as_slice(),
        proofs.as_mut_slice(),
        srs,
    );

    let proof_time = start.elapsed();
    info!("prover time: {:?}", proof_time);

    Ok(proofs)
}

#[allow(clippy::type_complexity)]
fn synthesize_circuits_batch<Scalar, C>(
    circuits: Vec<C>,
) -> Result<std::vec::Vec<ProvingAssignment<Scalar>>, SynthesisError>
where
    Scalar: PrimeField,
    C: Circuit<Scalar> + Send,
{
    let start = Instant::now();

    let provers = circuits
        .into_par_iter()
        .map(|circuit| -> Result<_, SynthesisError> {
            let mut prover = ProvingAssignment::new();

            prover.alloc_input(|| "", || Ok(Scalar::ONE))?;

            circuit.synthesize(&mut prover)?;

            for i in 0..prover.input_assignment.len() {
                prover.enforce(|| "", |lc| lc + Variable(Index::Input(i)), |lc| lc, |lc| lc);
            }

            Ok(prover)
        })
        .collect::<Result<Vec<_>, _>>()?;

    info!("synthesis time: {:?}", start.elapsed());

    Ok(provers)
}