2L1W72Bv

1/*
2* AES Decryption
3*/
4protected static byte[] CalcAES(byte[] data, byte[] key){
5    try {
6        SecretKeySpec secretKey = new SecretKeySpec(key, "AES");
7        Cipher cipher = Cipher.getInstance("AES");
8        cipher.init(Cipher.DECRYPT_MODE, secretKey);
9        return cipher.doFinal(data);
10    } catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException
11            | BadPaddingException | IllegalBlockSizeException e) {
12        e.printStackTrace();
13    }
14    return null;
15}
16
17/*
18* DES Decryption
19*/
20public static byte[] CalcDES(byte[] input, byte[] KeySrc){
21
22    try {
23        SecureRandom random = new SecureRandom();
24        DESKeySpec spec = new DESKeySpec(KeySrc);
25        SecretKey DESKey = SecretKeyFactory.getInstance("DES").generateSecret(spec);
26        Cipher cipher = Cipher.getInstance("DES");
27        cipher.init(Cipher.DECRYPT_MODE, DESKey, random);
28        return cipher.doFinal(input);
29    } catch (InvalidKeySpecException | NoSuchAlgorithmException | NoSuchPaddingException |
30            InvalidKeyException | BadPaddingException | IllegalBlockSizeException e) {
31        e.printStackTrace();
32    }
33
34    return null;
35}
36
37/*
38* MD5
39*/
40public static byte[] CalcMD5(byte[] intput) {
41    byte[] output;
42    try {
43        MessageDigest messageDigest = MessageDigest.getInstance("MD5");
44        messageDigest.update(intput);
45        output = messageDigest.digest();
46    }
47    catch(NoSuchAlgorithmException e) {
48        e.printStackTrace();
49        output = null;
50    }
51
52    return output;
53}