utils.js

"use strict";

let crypto = require('crypto');
var keypair = require('keypair');

// CRYPTO settings
const HASH_ALG = 'sha256';
const SIG_ALG = 'RSA-SHA256';

exports.hash = function hash(s, encoding) {
  encoding = encoding || 'hex';
  return crypto.createHash(HASH_ALG).update(s).digest(encoding);
}

exports.generateKeypair = function() {
  return keypair();
}

exports.sign = function(privKey, msg) {
  let signer = crypto.createSign(SIG_ALG);
  // Convert an object to its JSON representation
  let str = (msg === Object(msg)) ? JSON.stringify(msg) : ""+msg;
  return signer.update(str).sign(privKey, 'hex');
}

exports.verifySignature = function(pubKey, msg, sig) {
  let verifier = crypto.createVerify(SIG_ALG);
  // Convert an object to its JSON representation
  let str = (msg === Object(msg)) ? JSON.stringify(msg) : ""+msg;
  return verifier.update(str).verify(pubKey, sig, 'hex');
}

exports.calcAddress = function(key) {
  let addr = exports.hash(""+key, 'base64');
  //console.log(`Generating address ${addr} from ${key}`);
  return addr;
}