checkHmac(expected, hmacSha1(key), data);
  }

  private static void checkMd5(String expected, byte[] key, String data) {
    checkMd5(expected, key, data.getBytes(UTF_8));
  }

  private static void checkMd5(String expected, byte[] key, byte[] data) {
    checkHmac(expected, hmacMd5(key), data);
  }

  private static void checkHmac(String expected, HashFunction hashFunc, byte[] data) {