code: function(a, b) {
      a = Buffer.from(a);
      b = Buffer.from(b);
  
      // return early here if buffer lengths are not equal since timingSafeEqual
      // will throw if buffer lengths are not equal
      if (a.length !== b.length) {
        return false;
      }
  
      // use crypto.timingSafeEqual if available (since Node.js v6.6.0),
      // otherwise use our own scmp-internal function.
      if (crypto.timingSafeEqual) {
        return crypto.timingSafeEqual(a, b);
      }
  
      var len = a.length;
      var result = 0;
  
      for (var i = 0; i < len; ++i) {
        result |= a[i] ^ b[i];
      }
      return result === 0;
    }
docs: Secure compare, from https://github.com/freewil/scmp