Function constant_time_eq

cake-core/src/cake/sharding/auth.rs:40–48

Constant-time comparison of two byte slices.

(a: &[u8], b: &[u8])

/// Constant-time comparison of two byte slices.
pub fn constant_time_eq(a: &[u8], b: &[u8]) -> bool {
    if a.len() != b.len() {
        return false;
    }
    a.iter()
        .zip(b.iter())
        .fold(0u8, |acc, (x, y)| acc | (x ^ y))
        == 0
}

/// Master side of the mutual authentication.
///