hhqLXbmT

1public class EncryptionUtil {
2
3    private static final byte[] SALT = {(byte) 0x21, (byte) 0x21, (byte) 0xF0, (byte) 0x55, (byte) 0xC3, (byte) 0x9F, (byte) 0x5A, (byte) 0x75};
4
5    private final static int ITERATION_COUNT = 31;
6
7    private EncryptionUtil() {
8    }
9
10    public static String encode(String input) {
11        if (input == null) {
12            throw new IllegalArgumentException();
13        }
14        try {
15
16            KeySpec keySpec = new PBEKeySpec(null, SALT, ITERATION_COUNT);
17            AlgorithmParameterSpec paramSpec = new PBEParameterSpec(SALT, ITERATION_COUNT);
18
19            SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(keySpec);
20
21            Cipher ecipher = Cipher.getInstance(key.getAlgorithm());
22            ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
23
24            byte[] enc = ecipher.doFinal(input.getBytes());
25
26            String res = new String(Base64.encodeBase64(enc));
27            // escapes for url
28            res = res.replace('+', '-').replace('/', '_').replace("%", "%25").replace("\n", "%0A");
29
30            return res;
31
32        } catch (Exception e) {
33        }
34
35        return "";
36
37    }
38
39    public static String decode(String token) {
40        if (token == null) {
41            return null;
42        }
43        try {
44
45            String input = token.replace("%0A", "\n").replace("%25", "%").replace('_', '/').replace('-', '+');
46
47            byte[] dec = Base64.decodeBase64(input.getBytes());
48
49            KeySpec keySpec = new PBEKeySpec(null, SALT, ITERATION_COUNT);
50            AlgorithmParameterSpec paramSpec = new PBEParameterSpec(SALT, ITERATION_COUNT);
51
52            SecretKey key = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(keySpec);
53
54            Cipher dcipher = Cipher.getInstance(key.getAlgorithm());
55            dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
56
57            byte[] decoded = dcipher.doFinal(dec);
58
59            String result = new String(decoded);
60            return result;
61
62        } catch (Exception e) {
63            // use logger in production code
64            e.printStackTrace();
65        }
66
67        return null;
68    }
69
70}