Facebook Conceal - Image Encryption And Decryption

I am trying to encrypt and decrypt image using Facebook Conceal Library. This is the first time i am using it and hence bear with me if its trivial. I have looked at other question

Solution 1:

Here is how i solved the problem.. encryption and decryption works fine now.

// Encrypts the image and saves to directorypublicvoidencodeAndSaveFile(Bitmap photo, int code) {

    try {
        ContextWrappercw=newContextWrapper(getApplicationContext());
        Filedirectory= cw.getDir(DIRECTORY, Context.MODE_PRIVATE);
        Filemypath=newFile(directory, ENCRYPTEDFILENAME);

        Cryptocrypto=newCrypto(newSharedPrefsBackedKeyChain(this),
                newSystemNativeCryptoLibrary());

        if (!crypto.isAvailable()) {
            return;
        }

        OutputStreamfileStream=newBufferedOutputStream(
                newFileOutputStream(mypath));
        OutputStreamoutputStream= crypto.getCipherOutputStream(
                fileStream, newEntity("Password"));
        outputStream.write(bitmapToBytes(photo));
        outputStream.close();
    } catch (UnsupportedOperationException e) {
        e.printStackTrace();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

// convert Bitmap to bytesprivatebyte[] bitmapToBytes(Bitmap photo) {

    ByteArrayOutputStreamstream=newByteArrayOutputStream();
    photo.compress(Bitmap.CompressFormat.PNG, 100, stream);
    byte[] byteArray = stream.toByteArray();
    return byteArray;
}

// convert bytes to Bitmapprivate Bitmap bytesToBitmap(byte[] bytes) {

    Bitmapbitmap= BitmapFactory.decodeByteArray(bytes, 0, bytes.length);

    return bitmap;
}

// decode encrypted file and returns Bitmapprivate Bitmap decodeFile(String filename) {

    Cryptocrypto=newCrypto(newSharedPrefsBackedKeyChain(this),
            newSystemNativeCryptoLibrary());

    ContextWrappercw=newContextWrapper(getApplicationContext());
    Filedirectory= cw.getDir(DIRECTORY, Context.MODE_PRIVATE);
    Filefile=newFile(directory, filename);

    try {
        FileInputStreamfileStream=newFileInputStream(file);
        InputStreaminputStream= crypto.getCipherInputStream(fileStream,
                newEntity("Password"));

        ByteArrayOutputStreamout=newByteArrayOutputStream();

        int read;
        byte[] buffer = newbyte[1024];

        while ((read = inputStream.read(buffer)) != -1) {
            out.write(buffer, 0, read);
        }

        inputStream.close();

        Bitmapbitmap= bytesToBitmap(out.toByteArray());
        return bitmap;
    } catch (Exception e) {
        e.printStackTrace();
    }

    returnnull;
}

Here is how i am calling encodeAndSaveFile() and decodeFile(), in onActivityResult(), after returning from camera.

encodeAndSaveFile((Bitmap) data.getExtras().get("data"),
                        requestCode);
Bitmap decryptedImage = decodeFile(ENCRYPTEDFILENAME);