successfully receive new-style checksums, but this code won't be
tested for a while.
-Milestone 2 (written, not tested)
+Milestone 2 (done)
* server will accept new-style checksums and authenticators, as
well as old-style. It will never send them, and "bad things"
will happen if non-DES enctypes get used.
are no brain-dump issues to deal with. This is aesthetically
unpleasing, however.
-Milestone 3
+Milestone 3 (done)
* client sends only new-style messages
-Milestone 3.5
+Milestone 3.5 (in progress)
* refactor checksumming code
Milestone 4