this is java class for encrypt/decrypt any Android resource, o bye[] file

Ecryptor.java

package net.appersian.android.wod.common;

import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class Encryptor {

	public static byte[] generateKey(String password) throws Exception
	{
	    byte[] keyStart = password.getBytes("UTF-8");

	    KeyGenerator kgen = KeyGenerator.getInstance("AES");
	    SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
	    sr.setSeed(keyStart);
	    kgen.init(128, sr);
	    SecretKey skey = kgen.generateKey();
	    return skey.getEncoded();
	}

	    public static byte[] encodeFile(byte[] key, byte[] fileData) throws Exception
	    {

	        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
	        Cipher cipher = Cipher.getInstance("AES");
	        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);

	        byte[] encrypted = cipher.doFinal(fileData);

	        return encrypted;
	    }

	    public static byte[] decodeFile(byte[] key, byte[] fileData) throws Exception
	    {
	        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
	        Cipher cipher = Cipher.getInstance("AES");
	        cipher.init(Cipher.DECRYPT_MODE, skeySpec);

	        byte[] decrypted = cipher.doFinal(fileData);

	        return decrypted;
	    }
	
}

EncryptorHelper.java

package net.appersian.android.wod.common;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.apache.http.util.ByteArrayBuffer;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;

public class EncryptorHelper {
	
	public static byte[] encrypt(Context ctx,int resource,String pswd) throws Exception{
		InputStream is = ctx.getResources().openRawResource(resource);
		BufferedInputStream bis = new BufferedInputStream(is);
		ByteArrayBuffer baf = new ByteArrayBuffer(50);
		int current = 0;
		try {
			while ((current = bis.read()) != -1) {

				baf.append((byte) current);

			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		byte[] b = baf.toByteArray();
		byte[] filesBytes = null;
		byte[] yourKey = null;
		
		yourKey = Encryptor.generateKey(pswd);
		filesBytes = Encryptor.encodeFile(yourKey, b);

		return filesBytes;
	}
	
	public static byte[] decrypt(Context ctx,int resource,String pswd) throws Exception{
		InputStream is = ctx.getResources().openRawResource(resource);
		BufferedInputStream bis = new BufferedInputStream(is);
		ByteArrayBuffer baf = new ByteArrayBuffer(50);
		int current = 0;
		try {
			while ((current = bis.read()) != -1) {

				baf.append((byte) current);

			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		byte[] b = baf.toByteArray();
		byte[] filesBytes = null;
		byte[] yourKey = null;
		
		yourKey = Encryptor.generateKey(pswd);
		filesBytes = Encryptor.decodeFile(yourKey, b);
		
		return filesBytes;
	}
	
	public static Bitmap bitmapDecrypt(Context ctx,int resource,String pswd) throws Exception{
		byte[] b = decrypt(ctx, resource, pswd);
		return getBitmap(b);
	}
	
	public static BitmapDrawable drawableDecrypt(Context ctx,int resource,String pswd,Resources res) throws Exception{
		return new BitmapDrawable(res, bitmapDecrypt(ctx,resource,pswd));
	}
	
	public static Bitmap getBitmap(byte[] b){
		return BitmapFactory.decodeByteArray(b, 0, b.length);
	}
	
	
}

What do you mean by resource into decrypt and encrypt methods?

It's pretty old but what I remember is this resource int is the id from R file.