Currently, Debian mostly comes with Crypt::CBC 2.33 pre-packaged. If we package 2.35 or above we can benefit from a performance boost as well as having the ability to update our derivation function to using the recommended pbkdf2 algorithm instead of the backwards compatible default of opensslv1. If we choose to package this, we should also update Koha::Encryption to reflect the change and use pbkdf2.