hekate-crypto 0.36.0

Hash abstraction for the Hekate ZK proving system: Blake3, SHA-256, SHA-3-256.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64

// SPDX-FileCopyrightText: 2026 Andrei Kochergin <andrei@oumuamua.dev>
// SPDX-FileCopyrightText: 2026 Oumuamua Labs <info@oumuamua.dev>
// SPDX-License-Identifier: AGPL-3.0-only

use core::fmt::Debug;

#[cfg(feature = "blake3")]
pub mod blake3;
#[cfg(feature = "sha2")]
pub mod sha256;
#[cfg(feature = "sha3")]
pub mod sha3;

#[cfg(not(any(feature = "blake3", feature = "sha2", feature = "sha3")))]
compile_error!("At least one hashing feature must be enabled: 'blake3', 'sha2' or 'sha3'");

/// Defines a cryptographic hash function
/// interface for Fiat-Shamir and Merkle Trees.
/// Allows switching between SHA-3, SHA-256,
/// Blake3, etc. without changing core logic.
pub trait Hasher: Clone + Debug + Send + Sync + 'static {
    /// The size of the hash output in bytes.
    const OUTPUT_SIZE: usize;

    /// Create a new hasher instance.
    fn new() -> Self;

    /// Update the internal state with input bytes.
    fn update(&mut self, data: &[u8]);

    /// Finalize the hash and return the result.
    /// Resets the internal state if needed or consumes it.
    fn finalize(self) -> [u8; 32];

    /// Finalize and reset.
    fn finalize_reset(&mut self) -> [u8; 32];
}

#[cfg(feature = "sha3")]
pub type DefaultHasher = sha3::Sha3_256Hasher;

#[cfg(all(feature = "sha2", not(feature = "sha3")))]
pub type DefaultHasher = sha256::Sha256Hasher;

#[cfg(all(feature = "blake3", not(feature = "sha3"), not(feature = "sha2")))]
pub type DefaultHasher = blake3::Blake3Hasher;

#[cfg(feature = "sha3")]
#[inline]
pub const fn default_hasher_name() -> &'static str {
    "hekate_crypto::sha3::Sha3_256Hasher"
}

#[cfg(all(feature = "sha2", not(feature = "sha3")))]
#[inline]
pub const fn default_hasher_name() -> &'static str {
    "hekate_crypto::sha256::Sha256Hasher"
}

#[cfg(all(feature = "blake3", not(feature = "sha3"), not(feature = "sha2")))]
#[inline]
pub const fn default_hasher_name() -> &'static str {
    "hekate_crypto::blake3::Blake3Hasher"
}