Offline Token Generator

What is it?

This is an offline one time token generator and validator, where you can put content (like JSON or string) on the token for user identification, for instance.

How to use it?

Just instantiate the OfflineTokenGenerator class and use the method generate to create a new token and read to read a previously generated token.

// TTL Tolerance (optional, default 0) -------------V
// TTL in seconds (optional, default 5) ---------V  |
//      Generated AES hash will change           |  |
//      on each generation (randomized) and      |  |
//      also Every [TTL] seconds for             |  |
//      the same content being hashed.           |  |
// AES Bits (128 / 192 / 256) ---------------V   |  |
// AES password -----------------------V     |   |  |
//                                     |     |   |  |
var otg = new  OfflineTokenGenerator("key", 128, 8, 1);
var token = otg.generate({"test": 1, "hello": ["world"]});
// (example, not real hash)
// token==492f3f38d6b5d3ca859514e250e25ba65935bcdd9f4f40c124b773fe536fee7d
// Because it works in time frames (like token key fobs), the token will
// still be valid up to 16 seconds after it was created
// (TTL * (TTL Tolerance + 1))

// a few seconds later... (even on another computer!)
// both system clocks must be synchronized
// and the configuration must match because
// it is used in AES key generation! ---|-----|---|--|
var otg2 = new  OfflineTokenGenerator("key", 128, 8, 1);
var data = otg2.read(receivedToken);
// data == {"test": 1, "hello": ["world"]}

Pretty cool, Can I use it on my proprietary project?

Sure! This is MIT-licenced :)

Can I contribute?

Of course! PRs are always welcome!

What about other languages?

For TypeScript, this lib is made on TypeScript :) Maybe for Java you could use Nashorn Require.