gistfile1.java

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

public class decrypt {
	public decrypt() {
	}
	public static void main(String[] args) {
		try {
			//Part 1: Grab the username and password from lastlogin
			File lastLogin = new File(args[0]);
			String DESpassword = "passwordfile";
			byte[] salt = { 12, -99, 74, -28, 30, -125, 21, -4 };
			PBEParameterSpec pbeParamSpec = new PBEParameterSpec(salt, 5);
			SecretKey pbeKey = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(new PBEKeySpec(DESpassword.toCharArray()));
			Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");
			cipher.init(2, pbeKey, pbeParamSpec);
			DataInputStream dis;
			dis = new DataInputStream(new CipherInputStream(new FileInputStream(lastLogin), cipher));
			String username = dis.readUTF();
			String password = dis.readUTF();
			dis.close();
			
			//Part 2: Log in
			URL url = new URL ("https://login.minecraft.net/");
			String postdata = "user="+URLEncoder.encode(username, "UTF-8")+"&password="+URLEncoder.encode(password, "UTF-8")+"&version=1000";
			URLConnection conn = url.openConnection();
			conn.setDoOutput(true);
			conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
			
			//Write post data
			BufferedWriter out = new BufferedWriter(new OutputStreamWriter(conn.getOutputStream()));
			out.write(postdata);
			out.flush();
			out.close();

			BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
			String result = in.readLine();
			System.out.println(result.replace(":", "\n"));
			in.close();
		} catch (Exception e) {
			e.printStackTrace();
  		}
  	}
}