fFyu5cng

1//Encrypt
2EncryptHelper helper = new EncryptHelper();       
3EncryptedData a = helper.encrypt("key123", salt, "This is the text to encrypt");
4
5//Decrypt
6EncryptHelper helper1 = new EncryptHelper();       
7String b = helper1.decrypt("key123", salt, a);
8
9System.out.println(b);
10	
11public EncryptedData(byte[] iv, byte[] cipherText)
12{
13    _iv = iv;
14    _cipherText = cipherText;
15}
16
17public byte[] getIv() { return _iv; }
18public byte[] getCipherText() { return _cipherText; }
19	
20/* Encrypt the message. */
21        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
22        cipher.init(Cipher.ENCRYPT_MODE, secret);
23        AlgorithmParameters params = cipher.getParameters();
24
25        byte[] iv = params.getParameterSpec(IvParameterSpec.class).getIV();
26        byte[] ciphertext = cipher.doFinal(data.getBytes("UTF-8"));
27
28        return new EncryptedData(iv, ciphertext);
29    }
30    catch(Exception ex)
31    {
32        System.out.println(ex.getMessage());
33    }
34
35    return null;
36}
37
38public String decrypt(String password, byte[] salt, EncryptedData b)
39{
40    try
41    {
42        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
43        PBEKeySpec spec = new PBEKeySpec(password.toCharArray(), salt, 65536, 256);
44        SecretKey tmp = factory.generateSecret(spec);
45        SecretKey secret = new SecretKeySpec(tmp.getEncoded(), "AES");
46
47        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
48        cipher.init(Cipher.DECRYPT_MODE, secret, new IvParameterSpec(b.getIv()));
49        String plaintext = new String(cipher.doFinal(b.getCipherText()), "UTF-8");
50
51        return plaintext;
52    }
53    catch(Exception ex)
54    {
55        return ex.getMessage();
56    }
57}