How to securely encrypt data in Javascript with NaCl high level library

Hi!

In this tutorial, I will show you how you can encrypt or decrypt data in Javascript with TweetNaCl.js. It is a port of NaCl (Networking and Cryptography library) to Javascript. We’ll also see how to store the encrypted data in files.

To install TweetNaCl, do the following:

npm install tweetnacl

We also need tweetnacl-util to encode/decode in UTF-8 and Base64:

npm install tweetnacl-util

Note that tweetnacl-util is bad, they reversed names of functions to encode and decode UTF8…

Unfortunately, this port of NaCl don’t provide a key derivation function, so we’ll use scryptsy :

npm install scryptsy

Encryption

Decryption

Thanks for reading!