blob: 088b16ae4cab3fbe1f7e6733133c3ca338790d57 (
plain)
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
65
66
67
68
69
70
71
|
//! Provides hashing abstractions and implementations including SHA256 and a default dummy hasher.
use sha2::{Digest, Sha256};
/// A trait representing a generic hash function.
///
/// This allows the Merkle tree to use any hash function that conforms to this interface.
pub trait Hasher {
/// Hashes a sequence of bytes and returns the resulting hash as a hexadecimal string.
fn hash(&self, input: &[u8]) -> String;
}
/// A dummy hasher used for testing or demonstration purposes.
///
/// Always returns a static hash value.
#[derive(Clone)]
pub struct DummyHasher;
impl Hasher for DummyHasher {
fn hash(&self, input: &[u8]) -> String {
let sum: u32 = input.iter().map(|&b| b as u32).sum();
format!("hash_{:x}", sum)
}
}
#[derive(Clone)]
/// A hasher implementation using the SHA-256 cryptographic hash function.
pub struct SHA256Hasher;
impl Default for SHA256Hasher {
fn default() -> Self {
Self::new()
}
}
impl SHA256Hasher {
pub fn new() -> Self {
Self {}
}
}
impl Hasher for SHA256Hasher {
fn hash(&self, input: &[u8]) -> String {
let mut hasher = Sha256::new();
hasher.update(input);
hex::encode(hasher.finalize())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_sha256_hasher_with_known_input() {
let hasher = SHA256Hasher;
let input = "hello".as_bytes();
let expected_hash = "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824";
let actual_hash = hasher.hash(input);
assert_eq!(actual_hash, expected_hash);
}
#[test]
fn test_sha256_hasher_empty_string() {
let hasher = SHA256Hasher;
let input = &[];
let expected_hash = "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855";
let actual_hash = hasher.hash(input);
assert_eq!(actual_hash, expected_hash);
}
}
|
