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//! Constant-time utilities.
use subtle::{Choice, ConstantTimeEq};
/// Convert a boolean into a Choice.
///
/// This isn't necessarily a good idea or constant-time.
pub(crate) fn bool_to_choice(v: bool) -> Choice {
Choice::from(u8::from(v))
}
/// Return true if two slices are equal. Performs its operation in constant
/// time, but returns a bool instead of a subtle::Choice.
pub(crate) fn bytes_eq(a: &[u8], b: &[u8]) -> bool {
let choice = a.ct_eq(b);
choice.unwrap_u8() == 1
}
#[cfg(test)]
mod test {
// @@ begin test lint list maintained by maint/add_warning @@
#![allow(clippy::bool_assert_comparison)]
#![allow(clippy::clone_on_copy)]
#![allow(clippy::dbg_macro)]
#![allow(clippy::print_stderr)]
#![allow(clippy::print_stdout)]
#![allow(clippy::single_char_pattern)]
#![allow(clippy::unwrap_used)]
#![allow(clippy::unchecked_duration_subtraction)]
#![allow(clippy::useless_vec)]
#![allow(clippy::needless_pass_by_value)]
//! <!-- @@ end test lint list maintained by maint/add_warning @@ -->
#[test]
fn test_bytes_eq() {
use super::bytes_eq;
assert!(bytes_eq(&b"123"[..], &b"1234"[..3]));
assert!(!bytes_eq(&b"123"[..], &b"1234"[..]));
assert!(bytes_eq(&b"45"[..], &b"45"[..]));
assert!(!bytes_eq(&b"hi"[..], &b"45"[..]));
assert!(bytes_eq(&b""[..], &b""[..]));
}
}
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