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1import java.io.File;
2import java.io.FileInputStream;
3import java.io.FileOutputStream;
4import java.io.InputStream;
5import java.io.OutputStream;
6import java.util.Properties;
7
8import javax.crypto.Cipher;
9import javax.crypto.CipherInputStream;
10import javax.crypto.CipherOutputStream;
11import javax.crypto.KeyGenerator;
12import javax.crypto.SecretKey;
13import javax.crypto.spec.SecretKeySpec;
14
15public class Jirau {
16	
17	private static final byte[]	SALT					= "OH MYGOD".getBytes();
18	private static final String	ALG							= "DES";
19	private static final File PROPS = new File("my.properties");
20
21	public static void main(String[] args) throws Exception {
22		Properties p = new Properties();
23		p.setProperty("foo", "bar");
24		
25		save(p);
26		
27		Properties p2 = load();
28		
29		System.out.println(p2.get("foo"));
30		
31		
32	}
33	
34	public static Properties load() throws Exception {
35		Properties configs = new Properties();
36		
37		if (PROPS.exists()) {
38			FileInputStream fin = null;
39
40			try (InputStream in = new FileInputStream(PROPS)) {
41				final SecretKey key = new SecretKeySpec(SALT, ALG);
42
43				final Cipher cipher = Cipher.getInstance(ALG);
44				cipher.init(Cipher.DECRYPT_MODE, key);
45
46				configs.load(new CipherInputStream(in, cipher));
47			}
48		}
49		
50		return configs;
51	}
52
53	public static void save(Properties p) throws Exception {
54
55		try (OutputStream os = new FileOutputStream(PROPS)) {
56			final KeyGenerator kg = KeyGenerator.getInstance(ALG);
57
58			final Cipher c = Cipher.getInstance(ALG);
59			final SecretKey key = new SecretKeySpec(SALT, ALG);
60			c.init(Cipher.ENCRYPT_MODE, key);
61
62			p.store(new CipherOutputStream(os, c), null);
63		}
64	}
65	
66	
67}