1use super::CommitmentScheme;
 2use blake2::Blake2s as b2s;
 3use digest::Digest;
 4use crate::Error;
 5use rand::Rng;
 6
 7pub struct Blake2sCommitment;
 8
 9impl CommitmentScheme for Blake2sCommitment {
10    type Parameters = ();
11    type Randomness = [u8; 32];
12    type Output = [u8; 32];
13
14    fn setup<R: Rng>(_: &mut R) -> Result<Self::Parameters, Error> {
15        Ok(())
16    }
17
18    fn commit(
19        _: &Self::Parameters,
20        input: &[u8],
21        randomness: &Self::Randomness,
22    ) -> Result<Self::Output, Error> {
23        let mut h = b2s::new();
24        h.input(input);
25        h.input(randomness.as_ref());
26        let mut result = [0u8; 32];
27        result.copy_from_slice(&h.result());
28        Ok(result)
29    }
30}