docs: private static byte[] aes(byte[] input, byte[] key, int mode) {
  		try {
  			SecretKey secretKey = new SecretKeySpec(key, AES_ALG);
  			Cipher cipher = Cipher.getInstance(AES_ALG);
  			cipher.init(mode, secretKey);
  			return cipher.doFinal(input);
  		} catch (GeneralSecurityException e) {
  			throw ExceptionUtil.unchecked(e);
  		}
  	}