Given that we aren't handling local storage directly, and are instead passing out the object for storage by the calling application, the wording of the protocol needs to be tweaked to be consistent with the architecture.
That is:
Adjust Step 3iii to instead create the object for storage (containing the generated key and associated data). (Also make a best effort to not continue to hold the key object in memory past this point.)
Change Step 5 to say the client returns the storage object plus the key_id.
Given that we aren't handling local storage directly, and are instead passing out the object for storage by the calling application, the wording of the protocol needs to be tweaked to be consistent with the architecture.
That is:
key_id.