Check that Old Mac keys are correctly revealed
Created by: claucece
As we are currently implementing the revision number 2 of the OTRv4 specification, we need to include a consistent way of revealing MAC keys.
Please, refer to the "Revealing MAC keys" section of the OTRv4 spec.
Check that the list of the old mac keys is correctly set up.
Check that all old mac keys are included in the appropriate list.
Check that TLV type 1 reveals some MAC keys.
Reveal MAC keys of skipped stored messages keys.
Check that MAC keys are derived from the message key.
Correctly derive the MAC keys for the non-interactive DAKE.