rustauth_core/crypto/
buffer.rs

1//! Constant-time byte comparison helpers.
2
3/// Compare two byte-like values without early returns based on content.
4pub fn constant_time_equal<A, B>(a: A, b: B) -> bool
5where
6    A: AsRef<[u8]>,
7    B: AsRef<[u8]>,
8{
9    let a = a.as_ref();
10    let b = b.as_ref();
11    let mut diff = a.len() ^ b.len();
12    let length = a.len().max(b.len());
13
14    for index in 0..length {
15        let left = a.get(index).copied().unwrap_or(0);
16        let right = b.get(index).copied().unwrap_or(0);
17        diff |= usize::from(left ^ right);
18    }
19
20    diff == 0
21}

rustauth_core/crypto/buffer.rs

rustauth_core/crypto/
buffer.rs