Stephen Sprinkle

Great! If I develop a method for this I'll be sure to issue a pull request.

Not a super elegant solution, but a quick + dirty solution that I've employed thus far is to have a shared private/public key (different than the specific user's private/public keys)...

Edit: Actually, give this a look, it might work (I've not used it) -- https://code.google.com/p/jscryptolib/ Honestly, none that I have seen yet for the scenario above in a pure js...

Fantastic! Thanks so much. Got stuck on this aspect in a project and this solved it.