kkLkaYQy

1package com.cyberviy.ViyP;
2
3import android.util.Log;
4
5import javax.crypto.Cipher;
6import javax.crypto.SecretKey;
7import javax.crypto.spec.SecretKeySpec;
8
9public class AESUtils
10{
11
12    private static final byte[] keyValue =
13            new byte[]{'v', 'i', 'y', 'p', 'b', 'y', 'v', 'u', 'l', 'n', 'r', 't', 'e', 'a', 'm', 's'};
14
15
16    public static String encrypt(String cleartext)
17            throws Exception {
18        byte[] rawKey = getRawKey();
19        byte[] result = encrypt(rawKey, cleartext.getBytes());
20        return toHex(result);
21    }
22
23    public static String decrypt(String encrypted)
24            throws Exception {
25        byte[] enc = toByte(encrypted);
26        byte[] result = decrypt(enc);
27        return new String(result);
28    }
29
30    private static byte[] getRawKey() throws Exception {
31        SecretKey key = new SecretKeySpec(keyValue, "AES");
32        byte[] raw = key.getEncoded();
33        return raw;
34    }
35
36    private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
37        SecretKey skeySpec = new SecretKeySpec(raw, "AES");
38        Cipher cipher = Cipher.getInstance("AES");
39        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
40        byte[] encrypted = cipher.doFinal(clear);
41        return encrypted;
42    }
43
44    private static byte[] decrypt(byte[] encrypted)
45            throws Exception {
46        SecretKey skeySpec = new SecretKeySpec(keyValue, "AES");
47        Cipher cipher = Cipher.getInstance("AES");
48        cipher.init(Cipher.DECRYPT_MODE, skeySpec);
49        byte[] decrypted = cipher.doFinal(encrypted);
50        return decrypted;
51    }
52
53    public static byte[] toByte(String hexString) {
54        int len = hexString.length() / 2;
55        byte[] result = new byte[len];
56        for (int i = 0; i < len; i++)
57            result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2),
58                    16).byteValue();
59        return result;
60    }
61
62    public static String toHex(byte[] buf) {
63        if (buf == null)
64            return "";
65        StringBuffer result = new StringBuffer(2 * buf.length);
66        for (int i = 0; i < buf.length; i++) {
67            appendHex(result, buf[i]);
68        }
69        return result.toString();
70    }
71
72    private final static String HEX = "0123456789ABCDEF";
73
74    private static void appendHex(StringBuffer sb, byte b) {
75        sb.append(HEX.charAt((b >> 4) & 0x0f)).append(HEX.charAt(b & 0x0f));
76    }
77}