CipherInputStream is Empty when trying to decrypt file

Question

I'm trying to write a few helper methods to take care of reading and writing an encrypted file. I have two methods which successfully fulfill this and return an InputStream or an OutputStream (which are really the Cipher version) that I can use to read or write to the file. I have confirmed that these methods work peachy keen when wrapped with an Object stream and used to read and write an encrypted Object to file.

However, the problem arises when I try to read from an encrypted text file. I can verify that the String I feed it is being encrypted and written to the correct file, but when I try to read back from this file, the BufferedReader reports an EOF (null). The InputStream.available() method returns 0. I can assure that the file is there, is being found, and that the InputStream itself is not null. Can anybody tell me what might cause this?

Reading/Writing encrypted Object works beautifully (CorruptedStreamException is good here):

        private static void testWriteObject() {
    String path = "derp.derp";
    Derp start = new Derp("Asymmetril: " + message, 12543, 21.4, false);
    FilesEnDe.writeEncryptedObject(key, "derp.derp", start);
    echo("original");
    echo(">"+start);

    Object o;
    try {
        ObjectInputStream ois = new ObjectInputStream(ResourceManager.getResourceStatic(path));
        o = ois.readObject();
        echo("encrypted");
        echo(">"+o);
        ois.close();
    } catch (Exception e) {
        e.printStackTrace();
    }

    o = FilesEnDe.readEncryptedObject(key, path);
    echo("decrypted");
    echo(">"+o);
}

Output:

original
>Asymmetril: WE CAME, WE SAW, WE CONQUERED.; 12543; 21.4; false
[RM] > Trying to load resource: derp.derp
java.io.StreamCorruptedException
[RM] > Trying to load resource: derp.derp
decrypted
>Asymmetril: WE CAME, WE SAW, WE CONQUERED.; 12543; 21.4; false

Trying to decrypt the text file doesn't (note that the encrypted text is readable):

private static void testWriteFile() {
    String path = "EncryptedOut.txt";
    BufferedReader bis1, bis2;

    try {
        BufferedOutputStream os = new BufferedOutputStream(FilesEnDe.getEncryptedOutputStream(key, path));
        os.write(message.getBytes());
        os.flush();
                    os.close();
    } catch (IOException e1) {
        e1.printStackTrace();
    }

    echo("original");
    echo(">"+message);

    try {
        bis1 = new BufferedReader (new InputStreamReader(ResourceManager.getResourceStatic(path)));
        echo("encrypted");
        echo(">" + bis1.readLine());
        bis1.close();
    } catch (IOException e) {
        e.printStackTrace();
    }

    try {
        InputStream is = FilesEnDe.getEncryptedInputStream(key, path);
        InputStreamReader isr = new InputStreamReader(is);
        bis2 = new BufferedReader (isr);
        echo("bits in stream? " + is.available());

        echo("decrypted");
        echo(">"+bis2.readLine());
        bis2.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    }

Output:

original
>WE CAME, WE SAW, WE CONQUERED.
encrypted
>¤ƒ]£¬Vß4E?´?ùûe
[RM] > Trying to load resource: EncryptedOut.txt
bytes in stream? 0
decrypted
>null

The code used to create the CipherInputStream:

    public static InputStream getEncryptedInputStream(String key, String path) {
    try {
        InputStream is = ResourceManager.getResourceStatic(path);
        SecretKeySpec keyspec = new SecretKeySpec(getHash(key),"AES");
        Cipher c = Cipher.getInstance("AES");
        c.init(Cipher.DECRYPT_MODE, keyspec);
        return new CipherInputStream(is,c);
    } catch (NoSuchAlgorithmException e) {
        e.printStackTrace();
    } catch (NoSuchPaddingException e) {
        e.printStackTrace();
    } catch (InvalidKeyException e) {
        e.printStackTrace();
    }
    return null;
    }

THE PROBLEM OCCURS WHEN I TRY TO USE A CIPHERINPUTSTREAM TO DECRYPT THE FILE AND RETRIEVE THE ORIGINAL STRING.

Answer 1

It didn't matter whether I wrote via a PrintWriter or a BufferedOutputStream, nor whether I read with a Reader or not. Turns out, I forgot to close the OutputStream that created the file. As soon as I added that one little line, everything began working. Thank you to Antoniossss for suggesting I redo the broken part of my method. I wonder why Eclipse didn't mention a resource leak about it...

Answer 2

However, the problem arises when I try to read from an encrypted text file.

There is no such thing as an 'encrypted text file'. The result of encryption is binary, not text.

I can verify that the String I feed it is being encrypted and written to the correct file, but when I try to read back from this file, the BufferedReader reports an EOF (null).

You shouldn't be using a BufferedReader. It isn't text, it is binary. Use a BufferedInputStream.