Stellar Two-Party Threshold Signature Library

Stellar Javascript two party threshold signature SDK

Installation

1. If on Linux, install needed packages:

$ sudo apt-get update
$ sudo apt-get install libgmp3-dev pkg-config libssl-dev clang libclang-dev

2. Install Node.js (tested on Node 10)
3. Install nightly Rust (tested on rustc 1.38.0-nightly (0b680cfce 2019-07-09))

$ rustup toolchain install nightly-2019-07-10
$ rustup default nightly-2019-07-10-x86_64-unknown-linux-gnu # or value from `rustup show` command
$ rustc --version
# rustc 1.38.0-nightly (0b680cfce 2019-07-09)

4. Install the package:

$ npm i stellar-thresh-sig-js

Alternatively, clone it:

$ git clone https://github.com/dolcalmi/stellar-thresh-sig-js
$ cd stellar-thresh-sig-js
$ npm install

if you have problems getting a keypair please check this issue.

Usage

This library extends Keypair, Transaction and TransactionBuilder from Stellar SDK. You can use it in the same way that you use the Stellar SDK.

Initialization

import { Keypair, Transaction, TransactionBuilder } from 'stellar-thresh-sig-js';

Server Party1 Initialization

Before use threshold signatures with this library you must initialize server (party 1)

import { ThresholdSigServer } from 'stellar-thresh-sig-js';
new ThresholdSigServer().start();

from examples:

$ node ./examples/thresh-sig-server.js

with specific port and log mode:

# log options (off, debug, normal, critical)
$ ROCKET_PORT=8001 ROCKET_LOG=normal node ./examples/thresh-sig-server.js

If you want to more information about ENV variables go to Rocket ENV variables

Keypair

Create a new random key pair with two-party threshold signature:

const keypair = await Keypair.randomLocalPartyThreshSig();
// or
const keypair = await Keypair.randomLocalPartyThreshSig('http://your-server.com:8000');

Export key pair:

const keypairJSON = keypair.toJSON();
await saveToFileOrDB(keypairJSON);

Restore from json:

const keypairJSON = await loadFromFileOrDB();
const keypair = Keypair.fromJSON(keypairJSON);

Sign data:

const signature = await keypair.sign(data);

Full example in ./examples/keypair.js

$ node ./examples/keypair.js

Transaction and TransactionBuilder

Use it in the same way as StellarSdk

import { TransactionBuilder } from 'stellar-thresh-sig-js';

const transaction = new TransactionBuilder(sender, {
  fee,
  networkPassphrase: StellarSdk.Networks.TESTNET,
})
  .addOperation(...)
  .setTimeout(30)
  .build();

  // the only difference is that sign is an async function.
  await transaction.sign(senderKeypair);

Full example in ./examples/send-payment.js

$ node ./examples/send-payment.js

Development

Run all tests:

$ npm i
$ npm test

Run a single test suite:

$ npm run mocha -- test/lib/keypair.spec.js

Run a single test (case sensitive):

$ npm run mocha -- test/lib/keypair.spec.js --grep 'sign'

Library based on Two Party signatures JS SDK