Isomorphic SEPC256K1 JS

An ultra lightweight Universal (Browser and Node) JavaScript Elliptic Curve Digital Signature Algorithm (ECDSA) for secp256k1 curve that is used for many blockchains.

Exports

The npm package doesn’t have a main index module, so use deep imports from the ECMAScript modules that are exported via the package.json field exports:

Three main functions for recovering public key from a secp256k1 signature, signing and recovering public key from private key.

• recover_public_key.js
• sign.js
• get_public_key.js

And Some utility functions.

• sha256.js
• hmac_sha256.js
• utils.js

Features

We have no sideEffects so the package can be tree shaken.

Installation

For Node.js, to install isomorphic-secp256k1-js run:

npm i isomorphic-secp256k1-js

Then import:

Examples

Recover public key from private key.

const private_key = new Uint8Array([
  210, 101, 63, 247, 203, 178, 216, 255, 18, 154, 194, 126, 245, 120, 28, 230,
  139, 37, 88, 196, 26, 116, 175, 31, 45, 220, 166, 53, 203, 238, 240, 125,
]);

// Compressed public key.
console.log(get_public_key(private_key));

Generate a secp25k1 digital signature.

const private_key = new Uint8Array([
  210, 101, 63, 247, 203, 178, 216, 255, 18, 154, 194, 126, 245, 120, 28, 230,
  139, 37, 88, 196, 26, 116, 175, 31, 45, 220, 166, 53, 203, 238, 240, 125,
]);

const data = Uint8Array.from([
  0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
  22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
]);

sign({ hash: data, private_key }).then(console.log);

The logged output is { r: [23, …, 89], s: [111, …, 142], v: 1 }

const { number_to_array } = await import("isomorphic-secp256k1-js/utils");

const key_pair = await recover_public_key({
  data,
  signature: {
    r: number_to_array(
      50172533143525448505731076092836454339589141171079665638497512992118311974590n
    ),
    s: number_to_array(
      3372897403575535231543296615264124933490702058654620386530787287980439847001n
    ),
    v: 0,
  },
});
console.log(key_pair);

Logged output was Uint8Array(33) [2,192,222,210,188,31,19,5,…

Requirements

Supported runtime environments:

• Node.js versions >=16.0.0.
• Browsers matching the Browserslist query > 0.5%, not OperaMini all, not dead.