eth-tweak-key v1.0.0

eth-tweak-key

Tweak ethereum keys inspired by Bitcoin P2C

Usage

var etk = require('eth-tweak-key')

const tweak = crypto.randomBytes(32) // or from some other source
const { tweakedPublicKey, tweakedAddress } = etk.tweakPublic(Buffer.from(keypair.publicKey), tweak)

// The public key must be validated before use, and tweak changed if invalid
etk.validatePublicKey(tweakedPublicKey)
// can now verify signatures with the above

// To do signatures, derive the corresponding private key
const tweakedPrivateKey = etk.tweakPrivate(Buffer.from(keypair.privateKey), tweak)

API

etk.TWEAKBYTES

Byte length of a tweak

const { publicKey, address } = etk.tweakPublic(publicKey, tweak, [chainId=null])

Tweak publicKey with tweak and optional chainId. Tweak must be TWEAKBYTES. Note that you must pass a copy of publicKey for now as a downstream module mutates this. Returns { publicKey, address }

const valid = etk.validatePublicKey(publicKey)

Validates publicKey. If false you must choose another public key

const privateKey = etk.tweakPrivate(privateKey, tweak)

Tweak privateKey with tweak. Tweak must be TWEAKBYTES. Note that you must pass a copy of privateKey for now as a downstream module mutates this.

Install

npm install eth-tweak-key

License

ISC