Function encrypt

examples/encrypted_source_url.js:8–23

(target, key)

)

const encrypt = (target, key) => {
  const data = Buffer.from(target).toString('binary');

	// We use a random iv generation, but you'll probably want to use some
	// deterministic method
  const iv = crypto.randomBytes(16)

  const cipher = crypto.createCipheriv('aes-256-cbc', key, iv);

  let encrypted = Buffer.from(
    cipher.update(data, 'utf8', 'binary') + cipher.final('binary'),
    'binary',
  );

  return Buffer.concat([iv, encrypted]).toString('base64').replace(/=/g, '').replace(/\+/g, '-').replace(/\//g, '_')
}

const url = 'http://img.example.com/pretty/image.jpg'
const encrypted_url = encrypt(url, KEY)