Minecraft lastlogin decryptor

package decryptmc;

import java.io.*;
import java.util.*;
import javax.crypto.*;
import javax.crypto.spec.*;

public class DecryptMC {
    public static void main(String[] args) throws Exception {
        System.out.println(DecryptMC());
    }

    public static String DecryptMC() throws Exception {
        String output = null;
        Random random = new Random(43287234L);
        byte[] salt = new byte[8];
        random.nextBytes(salt);
        PBEParameterSpec pbeParamSpec = new PBEParameterSpec(salt, 5);
        SecretKey pbeKey = SecretKeyFactory.getInstance("PBEWithMD5AndDES")
                .generateSecret(new PBEKeySpec("passwordfile".toCharArray()));
        Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");
        cipher.init(2, pbeKey, pbeParamSpec);
        if (getWorkingDirectory().exists()) {
            File lastLogin = new File(getWorkingDirectory(), "lastlogin");
            DataInputStream dis = new DataInputStream(new CipherInputStream(
                    new FileInputStream(lastLogin), cipher));
            output = dis.readUTF() + " | " + dis.readUTF();
            dis.close();
        }
        return output;
    }

    public static File getWorkingDirectory() {
        String userHome = System.getProperty("user.home", ".");
        File workingDirectory;
        switch (getPlatform()) {
        case 1:
        case 2:
            workingDirectory = new File(userHome, ".minecraft/");
            break;
        case 3:
            String applicationData = System.getenv("APPDATA");
            if (applicationData != null)
                workingDirectory = new File(applicationData, ".minecraft/");
            else
                workingDirectory = new File(userHome, ".minecraft/");
            break;
        case 4:
            workingDirectory = new File(userHome,
                    "Library/Application Support/minecraft");
            break;
        default:
            workingDirectory = new File(userHome, ".minecraft/");
        }
        return workingDirectory;
    }

    private static int getPlatform() {
        String osName = System.getProperty("os.name").toLowerCase();
        if (osName.contains("linux"))
            return 1;
        if (osName.contains("unix"))
            return 1;
        if (osName.contains("solaris"))
            return 2;
        if (osName.contains("sunos"))
            return 2;
        if (osName.contains("win"))
            return 3;
        if (osName.contains("mac"))
            return 4;
        return 5;
    }
}