[warfangle]

It looks like that one is pure JS, using native node crypt functionality for randomness.

The one recommended in the article[0] actually includes a blowfish C++ binding, with both synchronous and asynchronous methods for comparing and hashing. That binding uses NAN[1] to queue AsyncWorkers. NAN uses libuv[2] behind the scenes to launch a thread[3].

0. https://www.npmjs.com/package/bcrypt

1. https://github.com/nodejs/nan

2. https://github.com/libuv/libuv

3. https://blog.scottfrees.com/building-an-asynchronous-c-addon...