encrypt_decrypt_with_init_vector_example_node.js

var crypto = require('crypto');

const CRYPTO_KEY = 'ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ'; // Must be 256 bytes (32 characters)

const message = `I see a little silhouetto of a man, 
Scaramouch, scaramouch will you do the fandango, 
Thunderbolt and lightning very very frightening me, 
Gallileo, Gallileo, 
Gallileo, Gallileo, 
Gallileo Figaro - magnifico`

const cryptoStr = encrypt(message);
console.log('cryptStr:', cryptoStr);
var decrypted = decrypt(cryptoStr);
console.log('decrypted:', decrypted);


function encrypt(text) {
  const initVector = crypto.randomBytes(16); //Always 16 bytes with AES
  const cipher = crypto.createCipheriv(
    'aes-256-cbc', CRYPTO_KEY, initVector
  );
  const encrypted = Buffer.concat(
    [cipher.update(text), cipher.final()]
  );
  return initVector.toString('hex') + encrypted.toString('hex');
}

function decrypt(text) {
  const inputBuffer = new Buffer(text, 'hex');
  const initVector = inputBuffer.slice(0,16);
  const decipher = crypto.createDecipheriv(
    'aes-256-cbc', CRYPTO_KEY, initVector
  );
  const encrypted = inputBuffer.slice(16);
  let decrypted = Buffer.concat(
    [decipher.update(encrypted), decipher.final()]
  );
  return decrypted.toString();
}