baggiKUG

1 public static String encrypt(String secretKey, String content) {
2        try {
3            byte[] iv = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
4            if (secretKey.length() > 0) iv = secretKey.substring(0,16).getBytes();
5            byte[] input = content.getBytes("utf-8");
6            byte[] sharedSecretKey = Base64.decode(SharedPrefOld.Companion.getInstance().getSharedSecretKey(), Base64.NO_WRAP);
7
8            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
9            cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(sharedSecretKey, "AES"), new IvParameterSpec(iv));
10            byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
11            int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
12            cipher.doFinal(cipherText, ctLength);
13            return Base64.encodeToString(cipherText, Base64.NO_WRAP);
14
15        } catch (Exception e) {
16            e.printStackTrace();
17            return "";
18        }
19    }
20
21
22
23
24    public static String decrypt(String secretKey, String content) {
25        try {
26            byte[] iv = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
27            if (secretKey.length() > 0) iv = secretKey.substring(0,16).getBytes();
28            byte[] decodedCipherText = Base64.decode(content, Base64.NO_WRAP);
29            byte[] sharedSecretKey = Base64.decode(SharedPrefOld.Companion.getInstance().getSharedSecretKey(), Base64.NO_WRAP);
30            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
31            cipher.init(Cipher.DECRYPT_MODE,
32                    new SecretKeySpec(sharedSecretKey, "AES"),
33                    new IvParameterSpec(iv));
34            byte[] decryptedBytes = cipher.doFinal(decodedCipherText);
35            return AppUtils.Companion.byteToString(decryptedBytes);
36
37        } catch (Exception e) {
38            e.printStackTrace();
39            return "";
40        }
41    }