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1public class AES_Helper {
2
3private Cipher cipherEncrypt, cipherDecrypt;
4
5
6public static String encode(String stringToEncode) throws NullPointerException {
7    if (stringToEncode == null) {
8        return "";
9    } else if (stringToEncode.equals("")) {
10        return "";
11    } else {
12        try {
13            SecretKeySpec skeySpec = getKey();
14            byte[] clearText = stringToEncode.getBytes("UTF8");
15
16            // IMPORTANT TO GET SAME RESULTS ON iOS and ANDROID
17            final byte[] iv = new byte[16];
18            Arrays.fill(iv, (byte) 0x00);
19            IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);
20
21            // Cipher is not thread safe
22            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
23            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, ivParameterSpec);
24
25            String encrypedValue = Base64.encodeToString(cipher.doFinal(clearText), Base64.DEFAULT);
26            Log.d("jacek", "Encrypted: " + stringToEncode + " -> " + encrypedValue);
27            return encrypedValue.replace("n", "");
28            //return encrypedValue;
29        } catch (UnsupportedEncodingException |BadPaddingException | IllegalBlockSizeException | NoSuchAlgorithmException |
30                InvalidKeyException | NoSuchPaddingException | InvalidAlgorithmParameterException e) {
31            e.printStackTrace();
32        }
33        return "";
34    }
35}
36
37
38public static String decode(String text) throws NullPointerException {
39
40    if (text == null) {
41        return "";
42
43    } else if (text.equals("")) {
44        return "";
45
46    } else {
47
48
49        try
50
51        {
52            SecretKey key = getKey();
53
54            // IMPORTANT TO GET SAME RESULTS ON iOS and ANDROID
55            final byte[] iv = new byte[16];
56            Arrays.fill(iv, (byte) 0x00);
57            IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);
58
59            byte[] encrypedPwdBytes = Base64.decode(text, Base64.DEFAULT);
60            // cipher is not thread safe
61            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
62            cipher.init(Cipher.DECRYPT_MODE, key, ivParameterSpec);
63            byte[] decrypedValueBytes = (cipher.doFinal(encrypedPwdBytes));
64
65            return new String(decrypedValueBytes);
66
67        } catch (Exception e)
68
69        {
70            e.printStackTrace();
71        }
72        return "";
73    }
74}
75
76
77private static SecretKeySpec getKey() throws UnsupportedEncodingException {
78
79    // You can change it to 128 if you wish
80    int keyLength = 256;
81    byte[] keyBytes = new byte[keyLength / 8];
82    // explicitly fill with zeros
83    Arrays.fill(keyBytes, (byte) 0x0);
84
85    // if password is shorter then key length, it will be zero-padded
86    // to key length
87    byte[] passwordBytes = KEY_MESSAGE_ENCRYPT.getBytes("UTF-8");
88    int length = passwordBytes.length < keyBytes.length ? passwordBytes.length : keyBytes.length;
89    System.arraycopy(passwordBytes, 0, keyBytes, 0, length);
90    return new SecretKeySpec(keyBytes, "AES");
91}
92
93private static SecretKeySpec getKeyWithCustomKey(String securityKey) throws UnsupportedEncodingException {
94
95    // You can change it to 128 if you wish
96    int keyLength = 256;
97    byte[] keyBytes = new byte[keyLength / 8];
98    // explicitly fill with zeros
99    Arrays.fill(keyBytes, (byte) 0x0);
100
101    // if password is shorter then key length, it will be zero-padded
102    // to key length
103    byte[] passwordBytes = securityKey.getBytes("UTF-8");
104    int length = passwordBytes.length < keyBytes.length ? passwordBytes.length : keyBytes.length;
105    System.arraycopy(passwordBytes, 0, keyBytes, 0, length);
106    return  new SecretKeySpec(keyBytes, "AES");
107}
108
109}