Simple Portable Password Manager

Clearly this is a work in progress. However, it does 2 things:

1. it takes a user supplied password and does proper salted key derivation, lik e you would hope a website was doing
2. it takes the derived key, and transforms it into a more friendly representation to supply to a webpage

This allows you to have unique passwords per site. This overall is very similar to Alan Karp's "Site Password" (see http://shiftleft.com/mirrors/www.hpl.hp.com/personal/Alan_Karp/site_password/index.html), but updated for more modern crypto and UI.

For defaults, the scrypt choices are good. The "rounds" parameter is really "p"; the other scrypt parameters are for now fixed (but at pretty sensible defaults). I wouldn't recommend going much above 5.

If you really want PBKDF2, set rounds much higher (4K is a minimum)

Drop the files in a directory; open interface.html with Firefox. Alternatively, if you put them on a web server somewhere you should get broader cross-browser compatibility (right now the scrypt routines make Chrome unhappy if you use it purely locally, as do the saved salts loading routine; see https://bugs.chromium.org/p/chromium/issues/detail?id=47416 for more info).