The password is essentially hash(passphrase + door id). Which means, nothing is stored, because both of those are inputs to the program. At least that's how I understood it.
But what I don't understand is, if the password is never stored, how can you allow for logins, etc.? I mean, there must be a way of comparison, or something? I think perhaps I'm having a brain melt, or I'm misunderstanding this completely. To me, this looks like it's creating a password from hashing the pass-phrase and doorID, but that just then generates another password...