Repository navigation
Expand file tree
/
Copy pathsha256.rs
More file actions
66 lines (63 loc) · 3.24 KB
/
Copy pathsha256.rs
File metadata and controls
66 lines (63 loc) · 3.24 KB
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
//! SHA-256 (FIPS 180-4), for verifying downloaded test corpora without
//! depending on `sha256sum`/`shasum` being installed.
const K: [u32; 64] = [
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74,
0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, 0xa831c66d,
0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e,
0x92722c85, 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
];
/// Lower-case hex SHA-256 of `data`.
pub fn hex(data: &[u8]) -> String {
let mut h: [u32; 8] = [0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19];
let mut msg = data.to_vec();
let bits = (data.len() as u64).wrapping_mul(8);
msg.push(0x80);
while msg.len() % 64 != 56 {
msg.push(0);
}
msg.extend_from_slice(&bits.to_be_bytes());
for block in msg.as_chunks::<64>().0 {
let mut w = [0u32; 64];
for (i, word) in block.as_chunks::<4>().0.iter().enumerate() {
w[i] = u32::from_be_bytes(*word);
}
for i in 16..64 {
let s0 = w[i - 15].rotate_right(7) ^ w[i - 15].rotate_right(18) ^ (w[i - 15] >> 3);
let s1 = w[i - 2].rotate_right(17) ^ w[i - 2].rotate_right(19) ^ (w[i - 2] >> 10);
w[i] = w[i - 16].wrapping_add(s0).wrapping_add(w[i - 7]).wrapping_add(s1);
}
let [mut a, mut b, mut c, mut d, mut e, mut f, mut g, mut hh] = h;
for i in 0..64 {
let s1 = e.rotate_right(6) ^ e.rotate_right(11) ^ e.rotate_right(25);
let ch = (e & f) ^ (!e & g);
let t1 = hh.wrapping_add(s1).wrapping_add(ch).wrapping_add(K[i]).wrapping_add(w[i]);
let s0 = a.rotate_right(2) ^ a.rotate_right(13) ^ a.rotate_right(22);
let maj = (a & b) ^ (a & c) ^ (b & c);
let t2 = s0.wrapping_add(maj);
hh = g;
g = f;
f = e;
e = d.wrapping_add(t1);
d = c;
c = b;
b = a;
a = t1.wrapping_add(t2);
}
for (x, v) in h.iter_mut().zip([a, b, c, d, e, f, g, hh]) {
*x = x.wrapping_add(v);
}
}
h.iter().map(|v| format!("{v:08x}")).collect()
}
#[cfg(test)]
mod tests {
#[test]
fn known_vectors() {
assert_eq!(super::hex(b""), "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855");
assert_eq!(super::hex(b"abc"), "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad");
let long = b"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq";
assert_eq!(super::hex(long), "248d6a61d20638b8e5c026930c3e6039a33ce45964ff2167f6ecedd419db06c1");
assert_eq!(super::hex(&[b'a'; 1000]), "41edece42d63e8d9bf515a9ba6932e1c20cbc9f5a5d134645adb5db1b9737ea3");
}
}