Bcrypt work factor testing

bcrypt-work-factor.js

var bcrypt = require('bcrypt');
var moment = require('moment');
var _ = require('lodash');
var randomstring = require("randomstring");
var colors = require('colors');
var times = 5;
var i = 0;
var workFactor = 10;
test(randomPassword(), i, workFactor);

function test(pass, i, workFactor) {
    var now = moment();
    bcrypt.hash(pass, workFactor, function(err, hash) {
        var then = moment();
        loghash(workFactor, moment.duration(then.diff(now))._data, pass);
        decrypt(pass, hash, workFactor, i);
    });
}

function decrypt(pass, hash, workFactor, i) {
    var now = moment();
    if (i <= times) {
        bcrypt.compare(pass, hash, function(err, res) {
            var then = moment();
            logdecrypt(workFactor, moment.duration(then.diff(now))._data, res);
            _.delay(function() {
                i++;
                test(randomPassword(), i, workFactor);
            }, moment.duration(then.diff(now))._data.milliseconds + 500);
        });
    } else {
        upFactor = workFactor + 1;
        console.log('------------- Upping factor'.red);
        test(randomPassword(), 0, upFactor);
    }
}

function loghash(workFactor, time, password) {
    console.log('Hash ' + time.seconds + ' seconds. At work factor ' + workFactor + ', with password ' + password);
}

function logdecrypt(workFactor, time, password) {
    console.log('Decrypt ' + time.seconds + ' seconds. At work factor ' + workFactor);
    console.log('-------------');
}

function randomPassword() {
    return randomstring.generate(Math.floor(Math.random() * 50) + 5);
}