PgB4XpZ9

1import java.io.IOException;
2import java.security.GeneralSecurityException;
3
4import javax.crypto.Cipher;
5import javax.crypto.SecretKey;
6import javax.crypto.SecretKeyFactory;
7import javax.crypto.spec.PBEKeySpec;
8import javax.crypto.spec.PBEParameterSpec;
9
10import sun.misc.BASE64Decoder;
11import sun.misc.BASE64Encoder;
12
13public class ProtectedConfigFile {
14
15    private static final char[] PASSWORD = "enfldsgbnlsngdlksdsgm".toCharArray();
16    private static final byte[] SALT = {
17        (byte) 0xde, (byte) 0x33, (byte) 0x10, (byte) 0x12,
18        (byte) 0xde, (byte) 0x33, (byte) 0x10, (byte) 0x12,
19    };
20
21    public static void main(String[] args) throws Exception {
22        String originalPassword = "secret";
23        System.out.println("Original password: " + originalPassword);
24        String encryptedPassword = encrypt(originalPassword);
25        System.out.println("Encrypted password: " + encryptedPassword);
26        String decryptedPassword = decrypt(encryptedPassword);
27        System.out.println("Decrypted password: " + decryptedPassword);
28    }
29
30    private static String encrypt(String property) throws GeneralSecurityException {
31        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
32        SecretKey key = keyFactory.generateSecret(new PBEKeySpec(PASSWORD));
33        Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
34        pbeCipher.init(Cipher.ENCRYPT_MODE, key, new PBEParameterSpec(SALT, 20));
35        return base64Encode(pbeCipher.doFinal(property.getBytes()));
36    }
37
38    private static String base64Encode(byte[] bytes) {
39        // NB: This class is internal, and you probably should use another impl
40        return new BASE64Encoder().encode(bytes);
41    }
42
43    private static String decrypt(String property) throws GeneralSecurityException, IOException {
44        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
45        SecretKey key = keyFactory.generateSecret(new PBEKeySpec(PASSWORD));
46        Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");
47        pbeCipher.init(Cipher.DECRYPT_MODE, key, new PBEParameterSpec(SALT, 20));
48        return new String(pbeCipher.doFinal(base64Decode(property)));
49    }
50
51    private static byte[] base64Decode(String property) throws IOException {
52        // NB: This class is internal, and you probably should use another impl
53        return new BASE64Decoder().decodeBuffer(property);
54    }
55
56}