bsv_wasm/hash/
sha256d_digest.rs

1use digest::{
2    consts::{U32, U64},
3    BlockInput, Digest, FixedOutput, Reset, Update,
4};
5
6use sha2::Sha256;
7
8use crate::reverse_digest::ReversibleDigest;
9
10#[derive(Clone, Default)]
11pub struct Sha256d {
12    engine: Sha256,
13    reverse: bool,
14}
15
16impl ReversibleDigest for Sha256d {
17    fn reverse(&self) -> Self {
18        let mut reversed = self.clone();
19        reversed.reverse = true;
20        reversed
21    }
22}
23
24impl BlockInput for Sha256d {
25    type BlockSize = U64;
26}
27
28impl Update for Sha256d {
29    fn update(&mut self, data: impl AsRef<[u8]>) {
30        Digest::update(&mut self.engine, data)
31    }
32}
33
34impl FixedOutput for Sha256d {
35    type OutputSize = U32;
36
37    fn finalize_into(self, out: &mut digest::generic_array::GenericArray<u8, Self::OutputSize>) {
38        let first_hash = &*self.engine.finalize();
39        let mut finished_hash = Sha256::digest(first_hash);
40        // let mut vec = finished_hash.to_vec();
41
42        if self.reverse {
43            finished_hash.reverse()
44        }
45
46        out.copy_from_slice(&*finished_hash)
47    }
48
49    fn finalize_into_reset(&mut self, out: &mut digest::generic_array::GenericArray<u8, Self::OutputSize>) {
50        self.clone().finalize_into(out);
51        digest::Reset::reset(self);
52    }
53
54    fn finalize_fixed(self) -> digest::generic_array::GenericArray<u8, Self::OutputSize>
55    where
56        Self: Sized,
57    {
58        let mut out = Default::default();
59        self.finalize_into(&mut out);
60        out
61    }
62
63    fn finalize_fixed_reset(&mut self) -> digest::generic_array::GenericArray<u8, Self::OutputSize> {
64        let mut out = Default::default();
65        self.finalize_into_reset(&mut out);
66        out
67    }
68}
69
70impl Reset for Sha256d {
71    fn reset(&mut self) {
72        self.engine = Sha256::default();
73    }
74}
75
76digest::impl_write!(Sha256d);
bsv_wasm/hash/sha256d_digest.rs

bsv_wasm/hash/
sha256d_digest.rs
