sov_rollup_interface/state_machine/crypto/
simple_hasher.rs

1use digest::typenum::U32;
2use digest::{Digest, FixedOutput, FixedOutputReset, OutputSizeUser, Reset, Update};
3
4/// A [`digest::Digest`] implementation which always returns the digest
5/// `[0;32]`.
6pub struct NoOpHasher;
7
8impl OutputSizeUser for NoOpHasher {
9    type OutputSize = U32;
10}
11
12impl Update for NoOpHasher {
13    fn update(&mut self, _data: &[u8]) {}
14}
15
16impl Reset for NoOpHasher {
17    fn reset(&mut self) {}
18}
19
20impl FixedOutput for NoOpHasher {
21    fn finalize_into(self, out: &mut digest::Output<Self>) {
22        *out = [0u8; 32].into();
23    }
24}
25
26impl FixedOutputReset for NoOpHasher {
27    fn finalize_into_reset(&mut self, out: &mut digest::Output<Self>) {
28        *out = [0u8; 32].into();
29    }
30}
31
32impl Digest for NoOpHasher {
33    fn new() -> Self {
34        Self
35    }
36
37    fn new_with_prefix(_data: impl AsRef<[u8]>) -> Self {
38        Self
39    }
40
41    fn update(&mut self, _data: impl AsRef<[u8]>) {}
42
43    fn chain_update(self, _data: impl AsRef<[u8]>) -> Self {
44        Self
45    }
46
47    fn finalize(self) -> digest::Output<Self> {
48        [0u8; 32].into()
49    }
50
51    fn finalize_into(self, out: &mut digest::Output<Self>) {
52        <Self as FixedOutput>::finalize_into(self, out)
53    }
54
55    fn finalize_reset(&mut self) -> digest::Output<Self>
56    where
57        Self: digest::FixedOutputReset,
58    {
59        [0u8; 32].into()
60    }
61
62    fn finalize_into_reset(&mut self, out: &mut digest::Output<Self>)
63    where
64        Self: digest::FixedOutputReset,
65    {
66        <Self as FixedOutputReset>::finalize_into_reset(self, out)
67    }
68
69    fn reset(&mut self)
70    where
71        Self: digest::Reset,
72    {
73        <Self as Reset>::reset(self)
74    }
75
76    fn output_size() -> usize {
77        32
78    }
79
80    fn digest(_data: impl AsRef<[u8]>) -> digest::Output<Self> {
81        [0u8; 32].into()
82    }
83}
sov_rollup_interface/state_machine/crypto/simple_hasher.rs

sov_rollup_interface/state_machine/crypto/
simple_hasher.rs
