Use password in place of keys

[mvcisback]

No description provided.

[wkennington]

How about we abstract this to support many (likely keys or passphrases) types of symmetric key derivation for encrypting the data.

I would imagine that our password store should be small enough to fit completely in ram, especially for v1. Maybe later we add support for extra, separate files which are indexed by this master store.

[mvcisback]

yeah, I agree. So we should define an API that can be used.

I'd imagine encrypt(dataformat) -> encrypted_dataformat would be sufficent
as well its inverse operation