Two Party signatures JS SDK
Supports:
| Algorithm | Curve | Compatible blockchains |
|---|---|---|
| ECDSA | Secp256k1 | Bitcoin, Ethereum |
| Schnorr | Secp256k1 | Zilliqa |
| EdDSA | Curve25519 | Tezos, Libra |
Installation:
- If on Linux, install needed packages:
$ sudo apt-get update
$ sudo apt-get install libgmp3-dev pkg-config libssl-dev clang libclang-dev- Install Node.js
(tested on Node 10) - Install nightly Rust
(tested on rustc 1.38.0-nightly (0b680cfce 2019-07-09)) - Install the package:
$ npm install @kzen-networks/thresh-sigAlternatively, clone it:
$ git clone https://github.com/KZen-networks/thresh-sig-js
$ cd thresh-sig-js
$ npm install
$ npm run buildUsage:
Start party one's server (acts as the co-signer in the two-party signature scheme):
const { Party1 } = require('@kzen-networks/thresh-sig');
const p1 = new Party1();
p1.launchServer();ECDSA party two:
const { EcdsaParty2 } = require('@kzen-networks/thresh-sig');
const crypto = require('crypto');
const P1_ENDPOINT = 'http://localhost:8000';
(async () => {
const party2 = new EcdsaParty2(P1_ENDPOINT);
const party2MasterKeyShare = await party2.generateMasterKey();
const party2ChildShare = party2.getChildShare(party2MasterKeyShare, 0, 0);
const msgHash = crypto.createHash('sha256').update('some message').digest();
const signature = await party2.sign(msgHash, party2ChildShare, 0, 0);
console.log(JSON.stringify(signature));
// {"r": <32-bytes-hex>,"s": <32-bytes-hex>,"recid": <0 or 1>}
})();Schnorr party two:
const { SchnorrParty2 } = require('@kzen-networks/thresh-sig');
const crypto = require('crypto');
const P1_ENDPOINT = 'http://localhost:8000';
(async () => {
const party2 = new SchnorrParty2(P1_ENDPOINT);
const party2Share = await party2.generateKey();
const msgHash = crypto.createHash('sha256').update('some message').digest();
const signature = await party2.sign(msgHash, party2Share);
console.log(JSON.stringify(signature));
// {"e": <32-bytes-hex>,"s": <32-bytes-hex>}
})();EdDSA party two:
const { Ed25519Party2 } = require('@kzen-networks/thresh-sig');
const crypto = require('crypto');
const P1_ENDPOINT = 'http://localhost:8000';
(async () => {
const party2 = new Ed25519Party2(P1_ENDPOINT);
const party2Share = await party2.generateKey();
console.log(party2Share.getAggregatedPublicKey().apk.bytes_str);
// <32-bytes-hex>
const msgHash = crypto.createHash('sha256').update('some message').digest();
const signature = await party2.sign(msgHash, party2Share);
console.log(JSON.stringify(signature));
// {"R":{"bytes_str":<32-bytes-hex>},"s":<32-bytes-hex>}
})()Demo:
You can run a command line demo and see the two-party signing protocol in action.
Party one:
$ node ./demo/party1.js
π§ Configured for production.
=> address: 0.0.0.0
=> port: 8000
=> log: critical
=> workers: 24
=> secret key: generated
=> limits: forms = 32KiB
=> keep-alive: 5s
=> tls: disabled
π Rocket has launched from http://0.0.0.0:8000
Party two (separate shell) -
- ECDSA:
$ node ./demo/ecdsa-party2.js
{"r":"b3d6168cc8ab6da64697b9e81c55863078da65cac7bbebc3d3f747dae0c6ac16","s":"449052412e20e510f8d4e31d721b3ef42199a9886a58a058c42d142b5850a177","recid":0}
- Schnorr:
$ node ./demo/schnorr-party2.js
{"e":"d960b3fe66d2dc1c2115c93b3e674344d73063c22148ff3bc8d67493ffb19814","s":"ed2ecaa8882ccaac946bf951835033d4326aaff2e1e466ecf1fdda32a6fc762b"}
- EdDSA:
$ node ./demo/eddsa-party2.js
{"R":{"bytes_str":"d86c5da0a257fd66acd007776f28d9f7a5083f84c66a41c98104c11cc5e9eaa3"},"s":"9964b5053843d6f6ddfaa25977f14f55676ae8a0e6bf89eafb412f417257abc"}
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