yz34aCkY

1// password to encrypt the file - how long should password be?
2private static final String password = "UxIpOqSdNmSTuxZaShPu";
3
4public static void main(String args[]) throws Exception {
5
6    // file to be encrypted
7    FileInputStream inF = new FileInputStream(GUI.AESinFile); // 'AESinFile' is a JFileChooser method from my GUI class
8
9    // encrypted file
10    FileOutputStream outF = new FileOutputStream("encrypted_file.des");
11
12    // generate and write the salt
13    SecureRandom sr = new SecureRandom();
14    byte[] salt = new byte[16];
15    sr.nextBytes(salt);
16    outF.write(salt);
17
18    // generate key
19    SecretKeyFactory skf = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
20    KeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt, 65536, 256); // salt, iteration count, key strength
21    SecretKey tmp = skf.generateSecret(keySpec);
22    SecretKey secretKey = new SecretKeySpec(tmp.getEncoded(), "AES"); // returns key
23
24    // initialise the cipher with secure padding
25    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
26    cipher.init(Cipher.ENCRYPT_MODE, secretKey);
27    AlgorithmParameters p = cipher.getParameters();
28
29    // iv used when initializing the cipher to make text more random
30
31    byte[] iv = p.getParameterSpec(IvParameterSpec.class).getIV();
32    outF.write(iv);
33
34    // file encryption
35    byte[] input = new byte[64];
36    int bytesRead;
37
38    while ((bytesRead = inF.read(input)) != -1) {
39        byte[] output = cipher.update(input, 0, bytesRead);
40        if (output != null)
41            outF.write(output);
42    }
43
44    byte[] output = cipher.doFinal();
45    if (output != null)
46        outF.write(output);
47        System.out.println("file encrypted");
48
49
50    inF.close();
51    outF.flush();
52    outF.close();
53    // inputScanner.close();
54
55}
56
57}