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1import java.io.*;
2import java.util.Random;
3import javax.crypto.*;
4import javax.crypto.spec.*;
5 
6public class MinecraftPasswordRetrieval {
7	public static final String ENCRYPTION_TYPE       = "PBEWithMD5AndDES";
8	public static final int    ENCRYPTION_ITERATIONS = 5;
9	public static final String ENCRYPTION_KEY        = "passwordfile";
10	public static final long   SALT_SEED   = 43287234L;
11	public static final int    SALT_LENGTH = 8;
12	
13	public static final int WINDOWS = 0;
14	public static final int MACOSX  = 1;
15	public static final int LINUX   = 2;
16	
17	public static void main(String[] args) throws Exception {
18		File passFile = new File(getMinecraftDir(), "lastlogin");
19		DataInputStream dis = new DataInputStream(new CipherInputStream(new FileInputStream(passFile), getCipher()));
20		System.out.println("Username: " + dis.readUTF());
21		System.out.println("Password: " + dis.readUTF());
22		dis.close();
23	}
24	
25	public static File getMinecraftDir() {
26		File home = new File(System.getProperty("user.home"));
27		switch (getOS()) {
28			case WINDOWS: return new File(System.getenv("APPDATA"), ".minecraft");
29			case MACOSX:  return new File(home, "Library/Application Support/minecraft");
30			case LINUX:   return new File(home, ".minecraft");
31		}
32		throw new RuntimeException("The Compiler is too stupid to realize that this line is dead code.");
33	}
34	
35	public static Cipher getCipher() throws Exception {
36		SecretKey pbeKey = SecretKeyFactory.getInstance(ENCRYPTION_TYPE).generateSecret(new PBEKeySpec(ENCRYPTION_KEY.toCharArray()));
37		PBEParameterSpec pbeParamSpec = new PBEParameterSpec(getSalt(), ENCRYPTION_ITERATIONS);
38		Cipher cipher = Cipher.getInstance(ENCRYPTION_TYPE);
39		cipher.init(Cipher.DECRYPT_MODE, pbeKey, pbeParamSpec);
40		return cipher;
41	}
42	
43	public static byte[] getSalt() {
44		Random random = new Random(SALT_SEED);
45		byte[] salt = new byte[SALT_LENGTH];
46		random.nextBytes(salt);
47		return salt;
48	}
49	
50	public static int getOS() {
51		String osName = System.getProperty("os.name");
52		if (osName.startsWith("Windows"))
53			return WINDOWS;
54		else if (osName.equals("Mac OS X"))
55			return MACOSX;
56		return LINUX; // Linux, BSD, Solaris, …
57	}
58}