ethereum mnemonic

ethereum_mnemonic.js

"use strict"
const Mnemonic = require('bitcore-mnemonic')
const EthereumBIP44 = require('ethereum-bip44/dist/es5')
const c = console

let mnemonic
let mnemonicString

let store
if (typeof localStorage !== "undefined") {
  store = localStorage
}

if (store && store.mnemonic) {
  mnemonicString = store.mnemonic
  mnemonic = new Mnemonic(store.mnemonic)
} else {
  mnemonic = new Mnemonic()
  mnemonicString = mnemonic.phrase.toString()
  if (store) {
    store.mnemonic = mnemonicString
  }
}

let keypairHD  = new EthereumBIP44(mnemonic.toHDPrivateKey())
let address    = keypairHD.getAddress(0)
let privateKey = keypairHD.getPrivateKey(0)
privateKey     = privateKey.toString('hex')

c.log("mnemonic:",   mnemonicString)
c.log("address:",    address)
c.log("privateKey:", privateKey)

if (typeof window  !== "undefined" && window) {
  window.address = address
  window.privateKey = privateKey
  window.mnemonicString = mnemonicString
}