Eu tenho dois métodos para criptografar-salvar e descriptografar-carregar objeto de arquivo no armazenamento interno do Android.

O processo de criptografar e salvar é feito sem nenhum problema, mas quando eu quero carregar o objetoStreamCorruptedException ocorre eminputStream = new ObjectInputStream(cipherInputStream);

Pesquisei SO cada vez mais, mas não encontrei uma solução para o meu problema. todas as outras soluções são para vida útil do soquete ou assim.

meu código está abaixo:

private static byte[] iv = { (byte) 0xB1, (byte) 0x15, (byte) 0xB5,
        (byte) 0xB7, (byte) 0x66, (byte) 0x43, (byte) 0x2F, (byte) 0xA4,
        (byte) 0xB1, (byte) 0x15, (byte) 0x35, (byte) 0xC7, (byte) 0x66,
        (byte) 0x58, (byte) 0x2F, (byte) 0x5F };

método save: (funciona bem)

private static String saveToFile(Serializable object, String fileName,
        Context ctx) {
    try {
        Cipher cipher = null;
        cipher = Cipher.getInstance("DES");
        SecretKey key = KeyGenerator.getInstance("DES").generateKey();
        AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);

        cipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
        SealedObject sealedObject = null;
        sealedObject = new SealedObject(object, cipher);
        CipherOutputStream cipherOutputStream = null;

        FileOutputStream fos = ctx.openFileOutput(fileName,
                Context.MODE_PRIVATE);
        cipherOutputStream = new CipherOutputStream(
                new BufferedOutputStream(fos), cipher);
        ObjectOutputStream outputStream = null;
        outputStream = new ObjectOutputStream(cipherOutputStream);
        outputStream.writeObject(sealedObject);
        outputStream.close();

        return "Save Complete!";

    } catch (IOException e) {
        e.printStackTrace();
        return e.getMessage();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
        return e.getMessage();
    } catch (NoSuchPaddingException e) {
        e.printStackTrace();
        return e.getMessage();
    } catch (InvalidKeyException e) {
        e.printStackTrace();
        return e.getMessage();
    } catch (IllegalBlockSizeException e) {
        e.printStackTrace();
        return e.getMessage();
    } catch (InvalidAlgorithmParameterException e) {
        e.printStackTrace();
        return e.getMessage();
    }
}

Método de carregamento: (não é possível carregar o objeto decipherInputStream)

private static Serializable loadFromFile(String fileName, Context ctx) {
    Cipher cipher = null;
    Serializable userList = null;
    try {
        cipher = Cipher.getInstance("DES");

        // Code to write your object to file
        SecretKey key = KeyGenerator.getInstance("DES").generateKey();
        AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);

        cipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
        CipherInputStream cipherInputStream = null;

        FileInputStream fos = ctx.openFileInput(fileName);
        cipherInputStream = new CipherInputStream(new BufferedInputStream(
                fos), cipher);

        ObjectInputStream inputStream = null;
        inputStream = new ObjectInputStream(cipherInputStream);
        // ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        SealedObject sealedObject = null;
        sealedObject = (SealedObject) inputStream.readObject();
        userList = (Serializable) sealedObject.getObject(cipher);
        inputStream.close();
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
        return e.getMessage();
    } catch (NoSuchPaddingException e) {
        e.printStackTrace();
        return e.getMessage();
    } catch (InvalidKeyException e) {
        e.printStackTrace();
        return e.getMessage();
    } catch (InvalidAlgorithmParameterException e) {
        e.printStackTrace();
        return e.getMessage();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
        return e.getMessage();
    } catch (StreamCorruptedException e) {
        e.printStackTrace();
        return e.getMessage();
    } catch (IOException e) {
        e.printStackTrace();
        return e.getMessage();
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
        return e.getMessage();
    } catch (IllegalBlockSizeException e) {
        e.printStackTrace();
        return e.getMessage();
    } catch (BadPaddingException e) {
        e.printStackTrace();
        return e.getMessage();
    }
    return userList;
}

métodos públicos para salvar e carregar:

public Serializable loadPlayer(Context ctx) {
    return loadFromFile("player.dat", ctx);
}

public String savePlayer(Player player, Context ctx) {
    return saveToFile(player, "player.dat", ctx);

}