crypto: simplify control flow in HKDF
Unify the implementation and perform the same OpenSSL calls regardless of whether the key and/or salt are empty. This simplifies the code and improves coverage.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Unify the implementation and perform the same OpenSSL calls regardless of whether the key and/or salt are empty. This simplifies the code and improves coverage.