class AesCtrDrbg implements Drbg {

  void initCipher(byte[] key, byte[] iv) {
    SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
    IvParameterSpec ivSpec = new IvParameterSpec(iv);
    ExceptionConverter.safe(() -> {
      cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
      return null;
    }, "Exception in initializing the cipher");
  }

  public  AesCtrDrbg();
  public  AesCtrDrbg(byte[] seed);

}