dryoc/classic/
crypto_hash.rs

1use crate::constants::CRYPTO_HASH_SHA512_BYTES;
2use crate::sha512::*;
3
4/// Type alias for SHA512 digest output.
5pub type Digest = [u8; CRYPTO_HASH_SHA512_BYTES];
6
7/// Computes a SHA-512 hash from `input`.
8pub fn crypto_hash_sha512(output: &mut Digest, input: &[u8]) {
9    let mut state = crypto_hash_sha512_init();
10    crypto_hash_sha512_update(&mut state, input);
11    crypto_hash_sha512_final(state, output);
12}
13
14/// Internal state for `crypto_hash_*` functions.
15#[derive(Default)]
16pub struct Sha512State {
17    pub(super) hasher: Sha512,
18}
19
20/// Initializes a SHA-512 hasher.
21pub fn crypto_hash_sha512_init() -> Sha512State {
22    Sha512State::default()
23}
24
25/// Updates `state` of SHA-512 hasher with `input`.
26pub fn crypto_hash_sha512_update(state: &mut Sha512State, input: &[u8]) {
27    state.hasher.update(input);
28}
29
30/// Finalizes `state` of SHA-512, and writes the digest to `output` consuming
31/// `state`.
32pub fn crypto_hash_sha512_final(state: Sha512State, output: &mut Digest) {
33    state.hasher.finalize_into_bytes(output)
34}
35
36#[cfg(test)]
37mod tests {
38    use super::*;
39
40    #[test]
41    fn test_crypto_hash_sha512() {
42        use sodiumoxide::crypto::hash;
43
44        use crate::rng::randombytes_buf;
45
46        let r = randombytes_buf(64);
47
48        let their_digest = hash::hash(&r);
49        let mut our_digest = [0u8; CRYPTO_HASH_SHA512_BYTES];
50        crypto_hash_sha512(&mut our_digest, &r);
51
52        assert_eq!(their_digest.as_ref(), our_digest);
53    }
54
55    #[test]
56    fn test_crypto_hash_sha512_update() {
57        use sodiumoxide::crypto::hash;
58
59        use crate::rng::randombytes_buf;
60
61        let mut their_state = hash::State::new();
62        let mut our_state = crypto_hash_sha512_init();
63
64        for _ in 0..10 {
65            let r = randombytes_buf(64);
66            their_state.update(&r);
67            crypto_hash_sha512_update(&mut our_state, &r);
68        }
69
70        let their_digest = their_state.finalize();
71        let mut our_digest = [0u8; CRYPTO_HASH_SHA512_BYTES];
72        crypto_hash_sha512_final(our_state, &mut our_digest);
73
74        assert_eq!(their_digest.as_ref(), our_digest);
75    }
76}
dryoc/classic/crypto_hash.rs

dryoc/classic/
crypto_hash.rs
