Node.JS

/* --- Code ready to copy -> paste -> run --- */ // Libraries const crypto = require('crypto'); const ENCODING = "hex"; // hex or base64 // Implementations function encryptAES256(clearMsg, key) { let iv = crypto.randomBytes(16); // Generating 16 byte random IV let cipher = crypto.createCipheriv( "aes256", crypto.createHash("sha256").update(key, "utf8").digest(), // 32 bytes

Copy and paste the following code in a .js file, then run it. // Libraries const crypto = require('crypto'); // Constants const OUTPUT_FORMAT = "hex"; const ALGORITHM = "aes256"; const KEY = "012345ABCDEFGHIJKLMNOPQRSTUVWXYZ"; const IV = "ABCDEF0123456789"; // Implementations function encrypt(message) { let cipher = crypto.createCipheriv( ALGORITHM, Buffer.from(KEY), Buffer.from(IV) ); return (Buffer.concat(