Vrf.js

<h1 align="center"> <img src="https://user-images.githubusercontent.com/5719833/43038622-34b064ea-8d4f-11e8-92ae-c5e060e5f1fc.png" width=220 /> </h1> <p align="center"> A Javascript Implementation for Verifiable Random Functions </p> <p align="center"> <a href="https://badge.fury.io/js/vrf.j"> <img src="https://badge.fury.io/js/vrf.js.svg" /> </a> </p>

Install

$ yarn add vrf.js

Usage

ECVRF

const {utils, ecvrf, sortition} = require('vrf.js')
const X = Buffer.from('test')

const [publicKey, privateKey] = utils.generatePair()

const {value, proof} = ecvrf.vrf(publicKey, privateKey, X)

ecvrf.verify(publicKey, X, proof, value)
// true

VRF Sortition

const {utils, ecvrf, sortition} = require('vrf.js')
const seed = Buffer.from('sortition')
const role = Buffer.from('test')
const w = utils.N(100)
const W = utils.N(1000)
const tau = utils.N(10)


const [publicKey, privateKey] = utils.generatePair()
const [value, proof, j] = sortition.sortition(
  privateKey, publicKey,
  seed, tau, role, w, W
)

if (+j > 0) {
  // next
}

more examples

APIs

• utils.generatePair
• utils.B
• utils.N
• ecvrf.vrf
• ecvrf.prove
• ecvrf.verify
• ecvrf.proofToHash
• ecvrf.hashToCurve
• sortition.sortition
• sortition.verifySort

TODOs

• [ ] browser support
• [ ] web examples
• [ ] visualization