ring_compat/
digest.rs

1//! Digest algorithms: SHA-1, SHA-256, SHA-384, SHA-512
2
3use core::{fmt, mem};
4use digest::{
5    core_api::BlockSizeUser,
6    generic_array::{typenum::*, GenericArray},
7    FixedOutput, FixedOutputReset, OutputSizeUser, Reset, Update,
8};
9use ring::digest::Context;
10
11macro_rules! impl_digest {
12    (
13        $(#[doc = $doc:tt])*
14        $name:ident, $hasher:ident, $block_len:ty, $output_size:ty
15    ) => {
16        $(#[doc = $doc])*
17        #[repr(transparent)]
18        #[derive(Clone)]
19        pub struct $name(Context);
20
21        impl $name {
22            fn take(&mut self) -> Context {
23                mem::replace(&mut self.0, Context::new(&ring::digest::$hasher))
24            }
25        }
26
27        impl Default for $name {
28            fn default() -> Self {
29                $name(Context::new(&ring::digest::$hasher))
30            }
31        }
32
33        impl Update for $name {
34            fn update(&mut self, data: &[u8]) {
35                self.0.update(data.as_ref())
36            }
37        }
38
39        impl BlockSizeUser for $name {
40            type BlockSize = $block_len;
41        }
42
43        impl OutputSizeUser for $name {
44            type OutputSize = $output_size;
45        }
46
47        impl FixedOutput for $name {
48            fn finalize_into(self, out: &mut GenericArray<u8, Self::OutputSize>) {
49                *out = GenericArray::clone_from_slice(self.0.finish().as_ref());
50            }
51        }
52
53        impl FixedOutputReset for $name {
54            fn finalize_into_reset(&mut self, out: &mut GenericArray<u8, Self::OutputSize>) {
55                *out = GenericArray::clone_from_slice(self.take().finish().as_ref());
56            }
57        }
58
59        impl Reset for $name {
60            fn reset(&mut self) {
61                self.take();
62            }
63        }
64
65        impl fmt::Debug for $name {
66            fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
67                f.debug_struct(stringify!($name)).finish_non_exhaustive()
68            }
69        }
70    };
71}
72
73impl_digest!(
74    /// Structure representing the state of a SHA-1 computation
75    Sha1,
76    SHA1_FOR_LEGACY_USE_ONLY,
77    U64,
78    U20
79);
80
81impl_digest!(
82    /// Structure representing the state of a SHA-256 computation
83    Sha256,
84    SHA256,
85    U64,
86    U32
87);
88
89impl_digest!(
90    /// Structure representing the state of a SHA-384 computation
91    Sha384,
92    SHA384,
93    U128,
94    U48
95);
96
97impl_digest!(
98    /// Structure representing the state of a SHA-512 computation
99    Sha512,
100    SHA512,
101    U128,
102    U64
103);
104
105impl_digest!(
106    /// Structure representing the state of a SHA-512/256 computation
107    Sha512Trunc256,
108    SHA512_256,
109    U128,
110    U32
111);
ring_compat/digest.rs

ring_compat/
digest.rs
