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
use crate::{
commitment::{PedersenCommitment, PedersenCommitmentParameters},
errors::CommitmentError,
traits::CommitmentScheme,
};
use snarkvm_curves::traits::{AffineCurve, Group, ProjectiveCurve};
use rand::Rng;
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
pub struct PedersenCompressedCommitment<G: Group + ProjectiveCurve, const NUM_WINDOWS: usize, const WINDOW_SIZE: usize>
{
pub parameters: PedersenCommitmentParameters<G, NUM_WINDOWS, WINDOW_SIZE>,
}
impl<G: Group + ProjectiveCurve, const NUM_WINDOWS: usize, const WINDOW_SIZE: usize> CommitmentScheme
for PedersenCompressedCommitment<G, NUM_WINDOWS, WINDOW_SIZE>
{
type Output = <G::Affine as AffineCurve>::BaseField;
type Parameters = PedersenCommitmentParameters<G, NUM_WINDOWS, WINDOW_SIZE>;
type Randomness = <G as Group>::ScalarField;
fn setup<R: Rng>(rng: &mut R) -> Self {
Self {
parameters: PedersenCommitmentParameters::setup(rng),
}
}
fn commit(&self, input: &[u8], randomness: &Self::Randomness) -> Result<Self::Output, CommitmentError> {
let commitment = PedersenCommitment::<G, NUM_WINDOWS, WINDOW_SIZE> {
parameters: self.parameters.clone(),
};
let output = commitment.commit(input, randomness)?;
let affine = output.into_affine();
debug_assert!(affine.is_in_correct_subgroup_assuming_on_curve());
Ok(affine.to_x_coordinate())
}
fn parameters(&self) -> &Self::Parameters {
&self.parameters
}
}
impl<G: Group + ProjectiveCurve, const NUM_WINDOWS: usize, const WINDOW_SIZE: usize>
From<PedersenCommitmentParameters<G, NUM_WINDOWS, WINDOW_SIZE>>
for PedersenCompressedCommitment<G, NUM_WINDOWS, WINDOW_SIZE>
{
fn from(parameters: PedersenCommitmentParameters<G, NUM_WINDOWS, WINDOW_SIZE>) -> Self {
Self { parameters }
}
}