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1package com.cwilldev.crypt;
2
3import java.security.NoSuchAlgorithmException;
4import javax.crypto.Cipher;
5import javax.crypto.NoSuchPaddingException;
6import javax.crypto.spec.IvParameterSpec;
7import javax.crypto.spec.SecretKeySpec;
8
9public class ApiCrypter {
10
11    private String iv              = "myuniqueivparam";
12    private String secretkey       = "mysecretkey";
13    private IvParameterSpec ivspec;
14    private SecretKeySpec keyspec;
15    private Cipher cipher;
16
17    public ApiCrypter()
18    {
19        ivspec = new IvParameterSpec(iv.getBytes());
20        keyspec = new SecretKeySpec(secretkey.getBytes(), "AES");
21
22        try {
23            cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
24        } catch (NoSuchAlgorithmException e) {
25            e.printStackTrace();
26        } catch (NoSuchPaddingException e) {
27            e.printStackTrace();
28        }
29    }
30
31    public byte[] encrypt(String text) throws Exception
32    {
33        if(text == null || text.length() == 0) {
34            throw new Exception("Empty string");
35        }
36        byte[] encrypted = null;
37        try {
38            cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
39            encrypted = cipher.doFinal(text.getBytes("UTF-8"));
40        }
41        catch (Exception e) {
42            throw new Exception("[encrypt] " + e.getMessage());
43        }
44        return encrypted;
45    }
46
47    public byte[] decrypt(String code) throws Exception
48    {
49        if(code == null || code.length() == 0) {
50            throw new Exception("Empty string");
51        }
52        byte[] decrypted = null;
53        try {
54            cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);
55            decrypted = cipher.doFinal(hexToBytes(code));
56        }
57        catch (Exception e) {
58            throw new Exception("[decrypt] " + e.getMessage());
59        }
60        return decrypted;
61    }
62
63    public static String bytesToHex(byte[] data)
64    {
65        if (data==null) {
66            return null;
67        }
68        int len = data.length;
69        String str = "";
70        for (int i=0; i<len; i++) {
71            if ((data[i]&0xFF)<16) {
72                str = str + "0" + java.lang.Integer.toHexString(data[i]&0xFF);
73            }
74            else {
75                str = str + java.lang.Integer.toHexString(data[i]&0xFF);
76            }
77        }
78        return str;
79    }
80
81    public static byte[] hexToBytes(String str) {
82        if (str==null) {
83            return null;
84        }
85        else if (str.length() < 2) {
86            return null;
87        }
88        else {
89            int len = str.length() / 2;
90            byte[] buffer = new byte[len];
91            for (int i=0; i<len; i++) {
92                buffer[i] = (byte) Integer.parseInt(str.substring(i*2,i*2+2),16);
93            }
94            return buffer;
95        }
96    }
97
98}