H8p3Nu30

1import javax.crypto.Cipher;
2import javax.crypto.SecretKey;
3import javax.crypto.SecretKeyFactory;
4import javax.crypto.spec.IvParameterSpec;
5import javax.crypto.spec.PBEKeySpec;
6import javax.crypto.spec.SecretKeySpec;
7import java.security.AlgorithmParameters;
8import java.security.spec.KeySpec;
9
10public class JCE {
11
12    private static final char[] PASSWORD = "abcdefg".toCharArray();
13
14    private static final byte[] SALT =
15        {
16            (byte)0x4D, (byte)0x9B, (byte)0xC6, (byte)0x53,
17            (byte)0x17, (byte)0xAF, (byte)0xE2, (byte)0x08
18        };
19
20    private static final int iterations = 65536;
21
22    public static void main(String... args) throws Exception {
23        String data = "Test";
24        for (String arg : args) {
25            data += ":" + arg;
26        }
27
28        System.out.println("Encrypting, \"" + data + "\"");
29
30        JCE jce = new JCE();
31        byte[] encryptedData = jce.encrypt(data);
32        System.out.println("Encrypted: " + new String(encryptedData));
33
34        byte[] decipheredText = jce.decrypt(encryptedData);
35        System.out.println("Decrypted: " + new String(decipheredText));
36    }
37
38    private byte[] initializationVector;
39
40    private byte[] encrypt(String property) throws Exception {
41        Cipher cipher = getCipher(Cipher.ENCRYPT_MODE);
42        return cipher.doFinal(property.getBytes());
43    }
44
45    private byte[] decrypt(byte[] property) throws Exception {
46        Cipher pbeCipher = getCipher(Cipher.DECRYPT_MODE);
47        return pbeCipher.doFinal(property);
48    }
49
50    private Cipher getCipher(int mode) throws Exception {
51        SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
52        KeySpec spec = new PBEKeySpec(PASSWORD, SALT, iterations, 256);
53        SecretKey tmp = factory.generateSecret(spec);
54        SecretKey key = new SecretKeySpec(tmp.getEncoded(), "AES");
55
56        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
57        if (this.initializationVector == null) {
58            cipher.init(mode, key);
59            AlgorithmParameters params = cipher.getParameters();
60            this.initializationVector = params.getParameterSpec(IvParameterSpec.class).getIV();
61        } else {
62            cipher.init(mode, key, new IvParameterSpec(this.initializationVector));
63        }
64
65        return cipher;
66    }
67}