using RNCryptor on android

I have some image files that are encrypted with RNCryptor and I want to decrypt them and use them as a background of a Framelayout. I walk through sample files, but my application force closes after a while and didn't show any images. I use JNCryptor library

I put encrypted image in raw folder as below:

and this is my code in my activity:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    FrameLayout img = (FrameLayout) findViewById(R.id.scrollView);

    final String password = "myPasswordString";

    JNCryptor cryptor = new AES256JNCryptor();

    Resources res = getResources();
    InputStream in_s = res.openRawResource(R.raw.troodon_ph);
    byte[] b = null;
    byte[] data = null;
    try {
        b = new byte[in_s.available()];
        in_s.read(b);
    } catch (IOException e) {
        Log.i("decrypt error", e.toString());
    }

    try {
        data = cryptor.decryptData(b, password.toCharArray());
    } catch (InvalidHMACException e) {
        Log.i("decrypt error", e.toString());
    } catch (CryptorException e) {
        Log.i("decrypt error", e.toString());
    }

    Bitmap mBitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
    BitmapDrawable bDrawable = new BitmapDrawable(res, mBitmap);

    img.setBackgroundDrawable(bDrawable);
}

This file works great on iOS with this code:

NSString  *imagePath = [[NSBundle mainBundle] pathForResource:getName ofType:@"wod"];
NSData *encryptedData = [NSData dataWithContentsOfFile:imagePath];
NSData *decryptedData = [RNDecryptor decryptData:encryptedData
                                    withPassword:PASSWORD
                                           error:&error];

UIImage*  bgImage = [UIImage imageWithData:decryptedData];
UIImageView * movingImageView = [[UIImageView alloc]initWithImage:bgImage];

And here is logcat output:

08-28 19:52:11.720: E/AndroidRuntime(1063): FATAL EXCEPTION: main 08-28 19:52:11.720: E/AndroidRuntime(1063): java.lang.RuntimeException: Unable to start activity ComponentInfo{net.appersian.android.wod/net.appersian.android.wod.MainActivity}: java.lang.NullPointerException 08-28 19:52:11.720: E/AndroidRuntime(1063): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 08-28 19:52:11.720: E/AndroidRuntime(1063): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 08-28 19:52:11.720: E/AndroidRuntime(1063): at android.app.ActivityThread.access$600(ActivityThread.java:130) 08-28 19:52:11.720: E/AndroidRuntime(1063): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 08-28 19:52:11.720: E/AndroidRuntime(1063): at android.os.Handler.dispatchMessage(Handler.java:99) 08-28 19:52:11.720: E/AndroidRuntime(1063): at android.os.Looper.loop(Looper.java:137) 08-28 19:52:11.720: E/AndroidRuntime(1063): at android.app.ActivityThread.main(ActivityThread.java:4745) 08-28 19:52:11.720: E/AndroidRuntime(1063): at java.lang.reflect.Method.invokeNative(Native Method) 08-28 19:52:11.720: E/AndroidRuntime(1063): at java.lang.reflect.Method.invoke(Method.java:511) 08-28 19:52:11.720: E/AndroidRuntime(1063): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 08-28 19:52:11.720: E/AndroidRuntime(1063): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 08-28 19:52:11.720: E/AndroidRuntime(1063): at dalvik.system.NativeStart.main(Native Method) 08-28 19:52:11.720: E/AndroidRuntime(1063): Caused by: java.lang.NullPointerException 08-28 19:52:11.720: E/AndroidRuntime(1063): at net.appersian.android.wod.MainActivity.onCreate(MainActivity.java:54) 08-28 19:52:11.720: E/AndroidRuntime(1063): at android.app.Activity.performCreate(Activity.java:5008) 08-28 19:52:11.720: E/AndroidRuntime(1063): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 08-28 19:52:11.720: E/AndroidRuntime(1063): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 08-28 19:52:11.720: E/AndroidRuntime(1063): ... 11 more

What am I doing wrong about decrypting the file?

update: i added e.printStackTrace() to try/catch, and here is my new logcat:

08-28 20:54:10.496: W/System.err(1487): org.cryptonode.jncryptor.InvalidHMACException: Incorrect HMAC value. 08-28 20:54:10.496: W/System.err(1487): at org.cryptonode.jncryptor.AES256JNCryptor.decryptV3Data(AES256JNCryptor.java:244) 08-28 20:54:10.496: W/System.err(1487): at org.cryptonode.jncryptor.AES256JNCryptor.decryptV3Data(AES256JNCryptor.java:319) 08-28 20:54:10.496: W/System.err(1487): at org.cryptonode.jncryptor.AES256JNCryptor.decryptData(AES256JNCryptor.java:276) 08-28 20:54:10.496: W/System.err(1487): at net.appersian.android.wod.MainActivity.onCreate(MainActivity.java:50) 08-28 20:54:10.496: W/System.err(1487): at android.app.Activity.performCreate(Activity.java:5008) 08-28 20:54:10.496: W/System.err(1487): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 08-28 20:54:10.496: W/System.err(1487): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 08-28 20:54:10.496: W/System.err(1487): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 08-28 20:54:10.496: W/System.err(1487): at android.app.ActivityThread.access$600(ActivityThread.java:130) 08-28 20:54:10.496: W/System.err(1487): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 08-28 20:54:10.496: W/System.err(1487): at android.os.Handler.dispatchMessage(Handler.java:99) 08-28 20:54:10.496: W/System.err(1487): at android.os.Looper.loop(Looper.java:137) 08-28 20:54:10.496: W/System.err(1487): at android.app.ActivityThread.main(ActivityThread.java:4745) 08-28 20:54:10.496: W/System.err(1487): at java.lang.reflect.Method.invokeNative(Native Method) 08-28 20:54:10.496: W/System.err(1487): at java.lang.reflect.Method.invoke(Method.java:511) 08-28 20:54:10.496: W/System.err(1487): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 08-28 20:54:10.496: W/System.err(1487): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 08-28 20:54:10.496: W/System.err(1487): at dalvik.system.NativeStart.main(Native Method)

i work a lot on this problem, i asked developer on Github and at last, i found that the problem was password string and not because of wrong password, is because of unicode character in password string, in some reason, if we want to get encoding/decoding work great on all device and platform, is better to choose ascii character for password.