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llcrypto: add another warning to ct_lookup.

This commit is contained in:
Nick Mathewson 2023-06-14 12:23:42 -04:00
parent 25db56777c
commit 2eba3d213e
1 changed files with 3 additions and 2 deletions
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5
crates/tor-llcrypto/src/util/ct.rs
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@ -97,10 +97,11 @@ impl<const N: usize> AsMut<[u8; N]> for CtByteArray<N> {
/// Otherwise, this function returns none.
///
/// We evaluate `matches` on every item of the array, and try not to
/// leak by timing which element (if any) matched.
/// leak by timing which element (if any) matched. Note that if
/// `matches` itself has side channels, this function can't hide them.
///
/// Note that this doesn't necessarily do a constant-time comparison,
/// and that it is not constant-time for found/not-found case.
/// and that it is not constant-time for the found/not-found case.
pub fn ct_lookup<T, F>(array: &[T], matches: F) -> Option<&T>
where
F: Fn(&T) -> Choice,