using pbkdf2 to hash password (node.js)

calc_password.js

// See: http://stackoverflow.com/questions/17218089/salt-and-hash-using-pbkdf2
// See: https://crackstation.net/hashing-security.htm

'use strict';

let Promise = require('bluebird');
let crypto = require('crypto');

function calcPassword(password) {
    const RANDOM_BYTES = 64;
    const ITERATIONS = 1<<14;
    const ALGORITHM = 'sha256';
    return new Promise((fulfill, reject) => {
        crypto.randomBytes(RANDOM_BYTES, (err, bytes) => {
            if (err) return reject(err);
            const salt = bytes.toString('hex');
            crypto.pbkdf2(password, salt, ITERATIONS, 64, ALGORITHM, (err, key) => {
                if (err) return reject(err);
                const hash = key.toString('hex');
                fulfill(`${ALGORITHM}:${ITERATIONS}:${salt}:${hash}`);
            });
        })
    });
}