tlsn-js

NPM Modules for proving and verifying using TLSNotary in the browser.

The prover requires a notary-server and a websocket proxy

[!IMPORTANT] The primary purpose of tlsn-js is to support the development of the TLSNotary browser extension.
Please do not treat this as a public API (yet).

[!IMPORTANT] tlsn-js is developed for the usage of TLSNotary in the Browser. This module does not work in nodejs.

License

This repository is licensed under either of

• Apache License, Version 2.0
• MIT license

at your option.

Example

// worker.ts
import * as Comlink from 'comlink';
import init, { Prover, NotarizedSession, TlsProof } from 'tlsn-js';

Comlink.expose({
  init,
  Prover,
  NotarizedSession,
  TlsProof,
});

// app.ts
import { NotaryServer } from 'tlsn-js';
const { init, Prover, NotarizedSession, TlsProof }: any = Comlink.wrap(
  new Worker(new URL('./worker.ts', import.meta.url)),
);

// To create a proof
await init({ loggingLevel: 'Debug '});
const notary = NotaryServer.from(`http://localhost:7047`);
const prover = await new Prover({ serverDns: 'swapi.dev' });

// Connect to verifier
await prover.setup(await notary.sessionUrl());

// Submit request
await prover.sendRequest('ws://localhost:55688', {
  url: 'https://swapi.dev/api/people/1',
  method: 'GET',
  headers: {
    'Content-Type': 'application/json',
  },
  body: {
    hello: 'world',
    one: 1,
  },
});

// Get transcript and precalculated ranges
const transcript = await prover.transcript();

// Select ranges to commit 
const commit: Commit = {
  sent: [
    transcript.ranges.sent.info!,
    transcript.ranges.sent.headers!['content-type'],
    transcript.ranges.sent.headers!['host'],
    ...transcript.ranges.sent.lineBreaks,
  ],
  recv: [
    transcript.ranges.recv.info!,
    transcript.ranges.recv.headers!['server'],
    transcript.ranges.recv.headers!['date'],
    transcript.ranges.recv.json!['name'],
    transcript.ranges.recv.json!['gender'],
    ...transcript.ranges.recv.lineBreaks,
  ],
};

// Notarize selected ranges
const serializedSession = await prover.notarize(commit);

// Instantiate NotarizedSession
// note: this is necessary because workers can only post messages in serializable values
const notarizedSession = await new NotarizedSession(serializedSession);


// Create proof for commited ranges
// note: this will reveal the selected ranges
const serializedProof = await notarizedSession.proof(commit);

// Instantiate Proof
// note: necessary due to limitation with workers
const proof = await new TlsProof(serializedProof);

// Verify a proof
const proofData = await proof.verify({
  typ: 'P256',
  key: await notary.publicKey(),
});

Running a local websocket proxy for https://swapi.dev

1. Install websocat:

   | tool | command | | ------ | ------------------------------ | | cargo | cargo install websocat | | brew | brew install websocat | | source | https://github.com/vi/websocat |

2. Run a websocket proxy for https://swapi.dev:

websocat --binary -v ws-l:0.0.0.0:55688 tcp:swapi.dev:443

Install as NPM Package

npm install tlsn-js

Development

# make sure you have rust installed
# https://www.rust-lang.org/tools/install
npm install

# this serve a page that will execute the example code at http://localhost:3001 
npm run dev

Build for NPM

npm install
npm run build

Adding a new test

1. Create a new new-test.spec.ts file in the test/ directory
2. Add your spec file to the entry object fin webpack.web.dev.config.js
3. Add a new div block to test/test.ejs like this: <div>Testing "new-test":<div id="new-test"></div></div>. The div id must be the same as the filename.