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