AES-256 encryption and decryption

aes256Encryption.js

const crypto = require('crypto');

const encryptionSecret = Buffer.from(process.env.ENCRYPTION_SECRET);

const encrypt = (string) => {
  const iv = crypto.randomBytes(16);
  const cipher = crypto.createCipheriv('aes-256-cbc', encryptionSecret, iv);
  let encrypted = cipher.update(string);
  encrypted = Buffer.concat([encrypted, cipher.final()]);

  return `${iv.toString('hex')}:${encrypted.toString('hex')}`;
};

function decrypt(string) {
  const stringParts = string.split(':');
  const iv = Buffer.from(stringParts.shift(), 'hex');
  const encryptedString = Buffer.from(stringParts.shift(), 'hex');
  const decipher = crypto.createDecipheriv('aes-256-cbc', encryptionSecret, iv);
  let decrypted = decipher.update(encryptedString);
  decrypted = Buffer.concat([decrypted, decipher.final()]);

  return decrypted.toString();
}

module.exports = {
  encrypt,
  decrypt,
};