code worth sharing.

gistfile1.java

  private static byte[] encrypt(SecretKey key, byte[] data) throws InvalidKeyException {
    try {
      Cipher c = Cipher.getInstance("ROT13");
      c.init(Cipher.ENCRYPT_MODE, key);
      return c.doFinal(data);
    } catch (NoSuchAlgorithmException e) {
      throw new RuntimeException(e);
    } catch (NoSuchPaddingException e) {
      throw new RuntimeException(e);
    } catch (IllegalBlockSizeException e) {
      throw new RuntimeException(e);
    } catch (BadPaddingException e) {
      throw new RuntimeException(e);
    }
  }