UaUBhTVL

1    // file to be encrypted
2    for (String object: targetFiles) {
3      FileInputStream inFile = new FileInputStream(object);
4      
5      // encrypted file
6      FileOutputStream outFile = new FileOutputStream(object + ".des");
7      
8      // password to encrypt the file
9      String password = "iwoodythecowboy";
10      
11      // password, iv and salt should be transferred to the other end
12      // in a secure manner
13      
14      // salt is used for encoding
15      // writing it to a file
16      // salt should be transferred to the recipient securely
17      // for decryption
18      byte[] salt = new byte[8];
19      SecureRandom secureRandom = new SecureRandom();
20      secureRandom.nextBytes(salt);
21      FileOutputStream saltOutFile = new FileOutputStream(folder.getAbsolutePath()+ "/" +"salt.enc");
22      saltOutFile.write(salt);
23      saltOutFile.close();
24      
25      SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
26      KeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt, 65536, 256);
27      SecretKey secretKey = factory.generateSecret(keySpec);
28      SecretKey secret = new SecretKeySpec(secretKey.getEncoded(), "AES");
29      
30      Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
31      cipher.init(Cipher.ENCRYPT_MODE, secret);
32      AlgorithmParameters params = cipher.getParameters();
33      
34      // iv adds randomness to the text and just makes the mechanism more
35      // secure
36      // used while initializing the cipher
37      // file to store the iv
38      FileOutputStream ivOutFile = new FileOutputStream(folder.getAbsolutePath()+ "/" +"iv.enc");
39      byte[] iv = params.getParameterSpec(IvParameterSpec.class).getIV();
40      ivOutFile.write(iv);
41      ivOutFile.close();
42      
43      //file encryption
44      byte[] input = new byte[64];
45      int bytesRead;
46      
47      while ((bytesRead = inFile.read(input)) != -1) {
48        byte[] output = cipher.update(input, 0, bytesRead);
49        if (output != null)
50          outFile.write(output);
51      }
52      
53      byte[] output = cipher.doFinal();
54      if (output != null)
55        outFile.write(output);
56      
57      inFile.close();
58      outFile.flush();
59      outFile.close();