Ethereum utilities

eth-address-generator.js

// Generate a private key => address from a passphrase
const passphrase = process.argv[2];

if(!passphrase) {
  console.log("Usage:   node app 'your-passphrase-here'");
  process.exit();
}

const EthUtil = require("ethereumjs-util")
const Web3 = require('web3')
const web3 = new Web3();

function hexToBytes(hex) {
  for (var bytes = [], c = 0; c < hex.length; c+=2)
  bytes.push(parseInt(hex.substr(c, 2), 16));
  return bytes;
}

function privateKeyToAddress(privateKey) {
  return `0x${EthUtil.privateToAddress(hexToBytes(privateKey)).toString('hex')}`
}

function passphraseToPrivateKey(text){
	return web3.sha3(text).substr(2);
}


const privKey = passphraseToPrivateKey(passphrase);
const address = privateKeyToAddress(privKey);

console.log("Address for the given passphrase:", address);