b78fWV3h

1package sort;
2
3import javax.crypto.Cipher;
4import javax.crypto.SecretKey;
5import javax.crypto.spec.SecretKeySpec;
6
7public class Bluetooth {
8
9    private static String key = "3A60432A5C01211F291E0F4E0C132825";
10    private static String msg = "060101012D1A683D48271A18316E471A";
11    private static String encMsg = "28BF68EB5D3334C8613762E87706F9FE";
12
13    public static void main(String[] args) {
14
15
16        byte msgHex[] = hexStringToByteArray(msg);
17        byte keyHex[] = hexStringToByteArray(key);
18
19        byte encryptedByte[] = encrypt(msgHex, keyHex);
20
21        System.out.println("String from encryptedByte = " + convertByteToString(encryptedByte));
22        System.out.println("Hex string from encryptedByte = " + getHex(encryptedByte));
23
24        byte encHex[] = hexStringToByteArray(encMsg);
25
26        byte decryptedByte[] = decrypt(encHex, keyHex);
27        String decString = getHex(decryptedByte);
28        System.out.println("decryptedByte to hexString = " + decString);
29
30        // msg and decString not matched.
31
32    }
33
34    public static byte[] decrypt(byte[] src, byte[] key) {
35        try {
36            SecretKey secretKey = new SecretKeySpec(key, "AES");
37            Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
38            cipher.init(Cipher.DECRYPT_MODE, secretKey);
39            byte[] decrypt = cipher.doFinal(src);
40            return decrypt;
41        } catch (Exception ex) {
42            System.out.println("Dec exception " + ex.getCause());
43            ex.printStackTrace();
44            return null;
45        }
46    }
47
48    public static byte[] encrypt(byte[] src, byte[] key) {
49        try {
50            SecretKey secretKey = new SecretKeySpec(key, "AES");
51
52            Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");//("AES/ECS/NoPadding");
53            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
54            byte[] decrypt = cipher.doFinal(src);
55            return decrypt;
56        } catch (Exception ex) {
57            System.out.println("enc   exception " + ex.getCause());
58            ex.printStackTrace();
59            return null;
60        }
61    }
62
63    public static String convertByteToString(byte[] by) {
64        try {
65            if (by != null && by.length > 0) {
66                String roundTrip = new String(by, "UTF8");
67                return roundTrip;
68            } else {
69                System.out.println("byte array is null");
70            }
71        } catch (Exception ex) {
72            System.out.println("exception aya = " + ex.getCause());
73        }
74
75        return "";
76    }
77
78    public static byte[] hexStringToByteArray(String s) {
79        int len = s.length();
80        byte[] data = new byte[len / 2];
81        for (int i = 0; i < len; i += 2) {
82            data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
83                    + Character.digit(s.charAt(i + 1), 16));
84        }
85
86        return data;
87    }
88
89
90    public static String getHex(byte b[]) {
91        StringBuffer result = new StringBuffer();
92        for (byte bk : b) {
93            result.append(String.format("%02X ", bk));
94            result.append(" "); // delimiter
95        }
96        return result.toString();
97    }
98
99}