docs: private static byte[] aes(final byte[] input, final byte[] key, final int mode)
  		throws GeneralSecurityException {
  		try {
  			SecretKey secretKey = new SecretKeySpec(key, AES_NAME);
  			Cipher cipher = Cipher.getInstance(AES_NAME);
  			cipher.init(mode, secretKey);
  			return cipher.doFinal(input);
  		} catch (NoSuchAlgorithmException e) {
  			throw new ImpossibleException(e);
  		} catch (NoSuchPaddingException e) {
  			throw new ImpossibleException(e);
  		}
  	}