tempo_commonware_node/consensus/
digest.rs

1//! [`Digest`] is a wrapper around [`B256`] to use eth block hash in commonware simplex.
2
3use std::ops::Deref;
4
5use alloy_primitives::B256;
6use commonware_codec::{FixedSize, Read, ReadExt as _, Write};
7use commonware_utils::{Array, Span};
8
9/// Wrapper around [`B256`] to use it in places requiring [`commonware_cryptography::Digest`].
10#[derive(Clone, Copy, Debug, Eq, PartialEq, Ord, PartialOrd, Hash)]
11#[repr(transparent)]
12pub struct Digest(pub B256);
13
14impl Array for Digest {}
15
16impl AsRef<[u8]> for Digest {
17    fn as_ref(&self) -> &[u8] {
18        self.0.as_ref()
19    }
20}
21
22impl Deref for Digest {
23    type Target = [u8];
24
25    fn deref(&self) -> &Self::Target {
26        self.0.deref()
27    }
28}
29
30impl commonware_math::algebra::Random for Digest {
31    /// Generate a random digest.
32    ///
33    /// # Note
34    ///
35    /// One-to-one copy of [`commonware_cryptography::Digest`]
36    /// for [`commonware_cryptography::sha256::Digest`].
37    fn random(mut rng: impl rand_core::CryptoRngCore) -> Self {
38        let mut array = B256::ZERO;
39        rng.fill_bytes(&mut *array);
40        Self(array)
41    }
42}
43
44impl commonware_cryptography::Digest for Digest {
45    const EMPTY: Self = Self(B256::ZERO);
46}
47
48impl FixedSize for Digest {
49    const SIZE: usize = 32;
50}
51
52impl std::fmt::Display for Digest {
53    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
54        self.0.fmt(f)
55    }
56}
57
58impl Read for Digest {
59    type Cfg = ();
60
61    fn read_cfg(
62        buf: &mut impl bytes::Buf,
63        _cfg: &Self::Cfg,
64    ) -> Result<Self, commonware_codec::Error> {
65        let array = <[u8; 32]>::read(buf)?;
66        Ok(Self(B256::new(array)))
67    }
68}
69
70impl Span for Digest {}
71
72impl Write for Digest {
73    fn write(&self, buf: &mut impl bytes::BufMut) {
74        self.0.write(buf)
75    }
76}
tempo_commonware_node/consensus/digest.rs

tempo_commonware_node/consensus/
digest.rs
