IBKEM trait flexibility

[leonbotros]

Currently the IBKEM trait is not very flexible. Some constructions require a public key in the decapsulation function (for example the FO variants). Right now, we pass an Option<&Self::Pk> to the decapsulation function, which panics at runtime when no public key is given, but ideally this would be a compile-time error.

[dobby-coder]

This issue has had no activity since 2022-07-08. Looking at src/lib.rs on main, the IBKEM trait still uses Option<&Self::Pk> in its decapsulation function (the example in the doc comment calls KV1::decaps(None, ...)), so the original complaint appears to still apply.

Either the trait redesign is still wanted and the issue should stay open, or the current design is considered acceptable and it can be closed. A maintainer decision would help.

Dobby backlog maintenance 2026-04-16