Create password protected file in android

package com.cz.util;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Properties;
import java.util.Random;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

import android.util.Log;


public class FileEncryptorDecryptor
{

private static String filename;
private static FileInputStream inFile;
private static FileOutputStream outFile;


public void encrypt(FileInputStream filename, FileOutputStream outFile,String password) throws Exception
{
inFile = filename;

// Use PBEKeySpec to create a key based on a password.
// The password is passed as a character array

PBEKeySpec keySpec = new PBEKeySpec(password.toCharArray());
SecretKeyFactory keyFactory =
SecretKeyFactory.getInstance("PBEWithMD5AndDES");
SecretKey passwordKey = keyFactory.generateSecret(keySpec);

// PBE = hashing + symmetric encryption. A 64 bit random
// number (the salt) is added to the password and hashed
// using a Message Digest Algorithm (MD5 in this example.).
// The number of times the password is hashed is determined
// by the interation count. Adding a random number and
// hashing multiple times enlarges the key space.

byte[] salt = new byte[8];
Random rnd = new Random();
rnd.nextBytes(salt);
int iterations = 100;

//Create the parameter spec for this salt and interation count

PBEParameterSpec parameterSpec = new PBEParameterSpec(salt, iterations);

// Create the cipher and initialize it for encryption.

Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");
cipher.init(Cipher.ENCRYPT_MODE, passwordKey, parameterSpec);

// Need to write the salt to the (encrypted) file. The
// salt is needed when reconstructing the key for decryption.

outFile.write(salt);

// Read the file and encrypt its bytes.

byte[] input = new byte[64];
int bytesRead;
while ((bytesRead = inFile.read(input)) != -1)
{
byte[] output = cipher.update(input, 0, bytesRead);
if (output != null) outFile.write(output);
}

byte[] output = cipher.doFinal();
if (output != null) outFile.write(output);

inFile.close();
outFile.flush();
outFile.close();

}

public void decrypt(FileInputStream filename, FileOutputStream outFile,String password) throws Exception
{
inFile = filename;

PBEKeySpec keySpec = new PBEKeySpec(password.toCharArray());
SecretKeyFactory keyFactory =
SecretKeyFactory.getInstance("PBEWithMD5AndDES");
SecretKey passwordKey = keyFactory.generateSecret(keySpec);

// Read in the previouly stored salt and set the iteration count.

byte[] salt = new byte[8];
inFile.read(salt);
int iterations = 100;

PBEParameterSpec parameterSpec = new PBEParameterSpec(salt, iterations);

// Create the cipher and initialize it for decryption.

Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");
cipher.init(Cipher.DECRYPT_MODE, passwordKey, parameterSpec);


byte[] input = new byte[64];
int bytesRead;
while ((bytesRead = inFile.read(input)) != -1)
{
byte[] output = cipher.update(input, 0, bytesRead);
if (output != null)
outFile.write(output);
}

byte[] output = cipher.doFinal();
if (output != null)
outFile.write(output);

inFile.close();
outFile.flush();
outFile.close();
}

}