Tech Rescue

Node.JS

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(

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(

How to Sign data and Verify signature in Node.JS

Another example that occurred to me. Very useful. What will we need? * Private key in PEM format * Public key in PEM format To get those you will have use OpenSSL, please take a look at this post How to generate RSA public and private keys with OpenSSL. For this example

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

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

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:

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

How to Encrypt / Decrypt with AES in Node.JS

Easy as pie! var crypto = require('crypto'); var AES128 = "aes128"; var AES192 = "aes192"; var AES256 = "aes256"; var password = 'Austin'; var plainText = 'Texas to the bone!'; // ------------------------------------------------ var cipher = crypto.createCipher(AES128, password); var decipher = crypto.createDecipher(AES128, password); console.log('AES-128:'); // Encrypting with AES128 var encText = cipher.update(