Facebook Conceal crypto for android is always unavailable

Question

I'm not able to use Facebook Conceal Libraries in my android application. The crypto always seems to return true on crypto.isAvailable(). Also, I'm using Android 1.0.2 that does not explicitly lists the libraries included, but I've put it in the correct libs folder.

I included the Jar and Native Binaries available on the previous link. The .zip file was included in the build as:

compile fileTree(dir: 'libs', include: ['*.jar', '*.zip'])

The build seem to work. I verified that the native libraries: cryptox.so and conceal.so are included in apk/libs, and the other jar binary with packages like com.facebook.crypto is included within classes.dex.

Following is the activity code:

import com.facebook.crypto.Crypto;
import com.facebook.crypto.Entity;
import com.facebook.crypto.keychain.SharedPrefsBackedKeyChain;
import com.facebook.crypto.util.SystemNativeCryptoLibrary;

public class ConcealActivity extends Activity implements View.OnClickListener {
public static String filename = "data.txt";
public static String filepath = "concealedata";
public static String TAG = "com.zing.ConcealActivity";
File myInternalFile;
Crypto crypto;

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

    Log.i(TAG, "created method.");
    ContextWrapper contextWrapper = new ContextWrapper(getApplicationContext());
    File directory = contextWrapper.getDir(filepath, Context.MODE_PRIVATE);
    myInternalFile = new File(directory, filename);
    crypto = new Crypto(new SharedPrefsBackedKeyChain(this), new SystemNativeCryptoLibrary());
    Button cencrypt = (Button) findViewById(R.id.cencrypt);
    cencrypt.setOnClickListener(this);

    Button cdecrypt = (Button) findViewById(R.id.cdecrypt);
    cdecrypt.setOnClickListener(this);
}

@Override
public void onClick(View v) {
    Log.i(TAG, "onclick method.");
    EditText myInputText = (EditText) findViewById(R.id.inputText);
    TextView responseText = (TextView) findViewById(R.id.responseText);
    String myData = "";

    switch (v.getId()) {
        case R.id.cencrypt:
            encryptandsave(myInputText.getText().toString().getBytes());
            myInputText.setText("");
            responseText.setText(readFile(myInternalFile));
            break;

        case R.id.cdecrypt:
            responseText.setText(readanddecrypt());
            break;
    }
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_conceal, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

// The first condition below is always satisfied meaning the library isn't loaded correctly.

// Encrypts the data and saves to directory
public void encryptandsave(byte[] plainTextBytes) {
    try {
    // Check for whether the crypto functionality is available
    // This might fail if android does not load libaries correctly.
        if (!crypto.isAvailable()) {
            Log.e(TAG, "Cipher unavailable.");
            return;
        }

        OutputStream fileStream = new BufferedOutputStream(new FileOutputStream(myInternalFile));
        OutputStream outputStream = crypto.getCipherOutputStream(fileStream, new Entity("Password"));
        outputStream.write(plainTextBytes);
        outputStream.close();
    } catch (Exception e) {
        Log.e(TAG, "EXCEPTION encryptandsave: " + e.getMessage());
    }
}

// decode encrypted file and returns Bitmap
private String readanddecrypt() {
    try {
        if (!crypto.isAvailable()) {
            Log.e(TAG, "Cipher unavailable.");
            return "";
        }
        FileInputStream fileStream = new FileInputStream(filename);
        InputStream inputStream = crypto.getCipherInputStream(fileStream, new Entity("Password"));
        ByteArrayOutputStream out = new ByteArrayOutputStream();

        int read;
        byte[] buffer = new byte[1024];
        while ((read = inputStream.read(buffer)) != -1) {
            out.write(buffer, 0, read);
        }
        inputStream.close();
        return out.toString();
    } catch (Exception e) {
        Log.e(TAG, "EXCEPTION readanddecrypt: " + e.getMessage());
    }
    return null;
}

public String readFile(File internalFile) {
    StringBuilder sb = new StringBuilder();
    try {
        FileInputStream fis = new FileInputStream(internalFile);
        DataInputStream in = new DataInputStream(fis);
        BufferedReader br = new BufferedReader(new InputStreamReader(in));
        String strLine;
        while ((strLine = br.readLine()) != null) {
            sb.append(strLine);
        }
        in.close();
    } catch (IOException e) {
        Log.e(TAG, "EXCEPTION readFile: " + e.getMessage());
        return "";
    }
    return sb.toString();
}

}

I'm not sure whether there's some issue with the library or the code.

Inside the jar, it seems like the code is failing in

com.facebook.crypto.util.SystemNativeCryptoLibrary.java

private static final ArrayList<String> LIBS = new ArrayList<String>() {{
  add("cryptox");
  add("conceal");
}};

// It throws a java.lang.UnsatisfiedLinkError exception while executing this piece below:

for (String name : LIBS) {
  System.loadLibrary(name);

Answer 1

Assaf's solution is the one that worked.
Below is the structure in which the libraries need to go.
Project:
|--lib:
|--|--armeabi:
|--|--|--.so files.

Note that the downloaded libs.zip has all the library files zipped in libs root folder, that needs to be changed to lib in order to get the libraries correctly bundled in .apk

Answer 2

You can try to put .so files to /app/src/main/jniLibs/ accordingly.

app
+-src
  +-main
    +-jniLibs
      +-armeabi
      | +-libconceal.so
      +-armeabi-v7a
      | +-libconceal.so
      +-mips
      +-x86
        +-libconceal.so