How to pack NodeJS project into a tarball?

Today I needed to install my brand new NodeJS-developed CLI application in my computer. After a quick search on the Internet I became aware that NPM allows me to do that very easily. The command is: npm pack Run it inside the project that you want to pack (at the same level of the package.json file). Here is an example …

How to hash files in Node.JS

The process is quite simple actually. Unfortunately ,as much things in Node.js, it works asynchronously, for some applications this will be perfect, but for some others it will be a mess to wait for the freaking hash to do something else, anyway I am not going to discuss that here I actually like Node.js. Please note that in the following …

How to generate RSA key pair in Node.JS?

Very straight forward process. Not complicated at all, I would say that the most difficult part would be to actually tweak the options, however the code below actually works and provides you the time it took to generate the key pair as well, just for informational purposes. Run the following code in Node.js. const crypto = require(‘crypto’); const RSA = …

How to Encrypt / Decrypt with AES (CCM & GCM) in Node.JS

First of all we have to understand what is CCM mode and GCM mode. Roughly: CCM CCM mode (Counter with CBC-MAC) is a mode of operation for cryptographic block ciphers. It is an authenticated encryption algorithm designed to provide both authentication and confidentiality. CCM mode is only defined for block ciphers with a block length of 128 bits. GCM Galois/Counter …

Base64 URL Safe Encoding / Decoding (RFC-7515)

A few days back I was required to encode some string in base 64 URL safe. After some research I found that there are several variants of base 64. The one implemented in the code below corresponds to RFC-7515. Here is the code: function encodeBase64Url(str) { let s = new Buffer(str).toString(‘base64’); // Regular base64 encoder s = s.replace(‘=’, ”); // …

How to generate random bytes in Node.JS

Easy! I discovered this recently and it is interesting to me. Here is a quick example: const crypto = require(‘crypto’); console.log(crypto.randomBytes(1).toString(“hex”)); console.log(crypto.randomBytes(2).toString(“hex”)); console.log(crypto.randomBytes(4).toString(“hex”)); console.log(crypto.randomBytes(8).toString(“hex”)); console.log(crypto.randomBytes(16).toString(“hex”)); console.log(crypto.randomBytes(32).toString(“hex”)); console.log(crypto.randomBytes(64).toString(“hex”)); When you run this code you might see something similar to this: E:\NodeJS>node randomCrypto.js d8 dccd 0709fee2 67d6d7c51cc59f0d af19069e601e47a9141d27d7d828a9d0 f83b7547452099462061734791da57443cc60828de7dcb8f7494eedceb3c889c e2e4a1faaf4190898aaf4fa786e20fe076237854ae4628127cb2eda4bafd3000b42788e347ade94d0c98614a40586b71ded3044879f791adedd6c0d4bb22e9ac The argument passed to the function is the length in bytes, when …

How to activate ES6 in Visual Studio Code

I’ve been looking for this answer for several weeks. Here is how to do it. Go to File > Preferences > Settings (or press Ctrl + ,) Add the following code in the USER SETTINGS tab “jshint.options”: { “esversion”: 6 } I have JSHint installed, if you don’t, you can install it from Visual Studio Code directly. Sources https://stackoverflow.com/questions/29953293/is-there-a-way-to-turn-on-es6-es7-syntax-support-in-vscode

Elliptic Curve Diffie-Hellman and AES Example in Node.JS

Recently I learned how to generate shared secrets using ECDH in Node.JS, but I still had to know how to use this shared secret. Here is one application for it. Use the ECDH to generate a shared secret and then use that shared secret to cipher/decipher messages between both parties, in this case Joe and Zoe. Here is the code: …

How to generate Diffie Hellman key pair in Node.JS

Super easy using crypto library. You can create a file called¬†DiffieHellmanKeyPairGeneration.js for example and paste this code inside: console.log(‘\n- — ( Diffie Hellman Key Pair Generator ) — -‘); var crypto = require(‘crypto’); var bitSize = 2048; var dh = crypto.createDiffieHellman(bitSize); dh.generateKeys(); console.log(‘Private Key:\n’ + dh.getPrivateKey(‘base64’)); console.log(‘\n’); console.log(‘Public Key:\n’ + dh.getPublicKey(‘base64’)); console.log(‘— End —‘); Then run it, wait…wait…wait…wait…wait…wait…, and you …

How to list supported Ciphers, Hashes, and Curves for Crypto in Node.JS

Not a complicated task. Here is the code: var crypto = require(‘crypto’); console.log(); console.log(‘[ SUPPORTED CIPHERS ]\n’) console.log(crypto.getCiphers()); console.log(); console.log(‘[ SUPPORTED HASHES ]\n’) console.log(crypto.getHashes()); console.log(); console.log(‘[ SUPPORTED CURVES ]\n’) console.log(crypto.getCurves()); Your output should be similar to this: E:\Codes\NodeJS\Cryptography>node listAllAlgorithms.js [ SUPPORTED CIPHERS ] [ ‘CAST-cbc’, ‘aes-128-cbc’, ‘aes-128-cbc-hmac-sha1’, ‘aes-128-cbc-hmac-sha256’, ‘aes-128-ccm’, ‘aes-128-cfb’, ‘aes-128-cfb1’, ‘aes-128-cfb8’, ‘aes-128-ctr’, ‘aes-128-ecb’, ‘aes-128-gcm’, ‘aes-128-ofb’, ‘aes-128-xts’, ‘aes-192-cbc’, ‘aes-192-ccm’, ‘aes-192-cfb’, …