triple-double

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Create e2ee WebSocket channels with X3DH and Double Ratchet.

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# triple-double

Create end-to-end encrypted WebSocket channels!

This package implements secret negotation via Extended Triple Diffie-Hellman (X3DH), allowing two peers to establish a WebSocket channel encrypted end-to-end with the [Double Ratchet Algorithm](https://en.wikipedia.org/wiki/Double_Ratchet_Algorithm) and [header encryption](https://signal.org/docs/specifications/doubleratchet/#double-ratchet-with-header-encryption).

**WARNING:** this library has NOT received a formal security audit, use at your own risk.

## Install

`npm i triple-double`

## Usage

### Server

#### Generate TLS certificate

`npm run cert`

This generates a private key and self-signed certificate and writes them to `private/`.

**Note:** the client will need the certificate to connect to the server.

#### Start server

`[host=] [port=] npm start`

### Client

#### Example

The following code snippets assume top-level `async/await` for readability purposes.

A secure, out-of-band channel is needed to communicate public keys and session IDs between peers.

Find the complete code in `./example.js` and run it with `npm run example`.

##### Alice publishes bundle

Alice only has to perform this step if:

* She hasn't published her bundle yet
* She runs out of one-time prekeys
* She wants to publish a new signed prekey

We'll assume she hasn't published her bundle yet.

See [here](https://signal.org/docs/specifications/x3dh/#publishing-keys) for more details.

```js
// Alice's code
const fs = require('fs')
const { Client } = require('triple-double')

const ca = fs.readFileSync('/path/to/cert')
const host = '1.2.3.4'
const port = 8888

const alice = new Client({ ca, host, port })

const pubKey = await alice.publishBundle()

// Send public key to Bob out-of-band
```

##### Bob sends initial message

See [here](https://signal.org/docs/specifications/x3dh/#sending-the-initial-message) for more details.

```js
// Bob's code
const fs = require('fs')
const { Client } = require('triple-double')

const ca = fs.readFileSync('/path/to/cert')
const host = '1.2.3.4'
const port = 8888

const bob = new Client({ ca, host, port })

const peerKey = Buffer.from(/* alice's public key */)
const plaintext = 'intial plaintext'

const sid = await bob.sendInitMessage(peerKey, plaintext)

// Send session ID to alice out-of-band
```

##### Alice receives initial message

See [here](https://signal.org/docs/specifications/x3dh/#receiving-the-initial-message) for more details.

```js
// Alice's code continued
const plaintext = await alice.recvInitMessage('<session ID from Bob>')
```

##### Connect

At this point, the peers can establish a secure WebSocket channel.

This operation won't complete until *both* peers are connected.

```js
// Alice's code continued
await alice.connect('<session ID>')
```

```js
// Bob's code continued
await bob.connect('<session ID>')
```

##### Send/receive messages

After connecting, the peers can send messages to each other!

These messages are encrypted with Double Ratchet (including header encryption).

```js
// Alice's code continued
alice.on('message', ({ sid, plaintext }) => {
  if (sid === '<session ID>') {
    // handle Bob's plaintext
  }
})

alice.send('<session ID>', 'hello "bob"')
```

```js
// Bob's code continued
bob.on('message', ({ sid, plaintext }) => {
  if (sid === '<session ID>') {
    // handle Alice's plaintext
  }
})

bob.send('<session ID>', 'hello "alice"')
```

Alice and Bob can establish secure channels to other peers, if they so choose.

##### Disconnect

Once a peer calls `disconnect()` with the session ID, the channel closes and *both* peers receive "disconnect" events.

```js
// Alice's code continued
alice.on('disconnect', sid => {
  if (sid === '<session ID>') {
    // Disconnected from Bob
  }
})

alice.disconnect('<session ID>')
```

```js
// Bob's code continued
bob.on('disconnect', sid => {
  if (sid === '<session ID>') {
    // Disconnected from Alice
  }
})
```

## Docs

`npm run doc`

This generates the documentation and writes it to `out/`.

Then you can open `out/index.html` in your browser.

## Test

`npm test`

## Lint

`npm run lint`

## Contributing

Go for it! Whether it's code cleanup, a bugfix, or feature request, your input is seriously appreciated.

Unsure where to start? Take a look at the code or [open an issue](https://github.com/zbo14/triple-double/issues/new).

## References
* [The Double Ratchet Algorithm](https://signal.org/docs/specifications/doubleratchet/)
* [The X3DH Key Agreement Protocol](https://signal.org/docs/specifications/x3dh/)
* [The XEdDSA and VXEdDSA Signature Schemes](https://signal.org/docs/specifications/xeddsa/)

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