to load:
(load "loader")

run tests
(run-all-tests)
should return t if everything runs okay.

Check the 'des-tests.lisp' for usage.

It's currently very 'chatty' and has lots of debug output that I used while implementing it.

does not have a read a file and encrypt the whole thing yet

only single block encryption

single key, plain DES.

Give it a 64bit key, ignores the parity bits, does not check parity. 

No cipher modes. (i.e. only ecb, but only one block)