bCsTQyci

1package net.appersian.android.wod.common;
2
3import java.security.SecureRandom;
4
5import javax.crypto.Cipher;
6import javax.crypto.KeyGenerator;
7import javax.crypto.SecretKey;
8import javax.crypto.spec.SecretKeySpec;
9
10public class Encryptor {
11
12	public static byte[] generateKey(String password) throws Exception
13	{
14	    byte[] keyStart = password.getBytes("UTF-8");
15
16	    KeyGenerator kgen = KeyGenerator.getInstance("AES");
17	    SecureRandom sr = SecureRandom.getInstance("SHA1PRNG", "Crypto");
18	    sr.setSeed(keyStart);
19	    kgen.init(128, sr);
20	    SecretKey skey = kgen.generateKey();
21	    return skey.getEncoded();
22	}
23
24	    public static byte[] encodeFile(byte[] key, byte[] fileData) throws Exception
25	    {
26
27	        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
28	        Cipher cipher = Cipher.getInstance("AES");
29	        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
30
31	        byte[] encrypted = cipher.doFinal(fileData);
32
33	        return encrypted;
34	    }
35
36	    public static byte[] decodeFile(byte[] key, byte[] fileData) throws Exception
37	    {
38	        SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
39	        Cipher cipher = Cipher.getInstance("AES");
40	        cipher.init(Cipher.DECRYPT_MODE, skeySpec);
41
42	        byte[] decrypted = cipher.doFinal(fileData);
43
44	        return decrypted;
45	    }
46	
47}