Exetools - Keymaker for JxB v1.5 demo version (Windows)

Demo version download
Code:
import java.io.*;

import java.lang.Runtime;

import java.util.Scanner;

import java.nio.ByteBuffer;

import java.security.*;

import java.math.*;



class MakeKey

{

  private static String getSN()

  {

    String s = null;

    Runtime runtime = Runtime.getRuntime();

    Process process;

    try {

      String as[] = {"wmic", "bios", "get", "serialnumber"};

      process = runtime.exec(as);

    } catch(IOException _ex) {

      return null;

    }



    Scanner scanner = new Scanner(process.getInputStream());

    while(scanner.hasNext()) {

      if("SerialNumber".equals(scanner.next())) {

        s = scanner.next().trim();

        break;

      }

    }



    scanner.close();



    return s;

  }



  private static int sum(int i)

  {

    int j = 0;

    for(; i > 0; i >>= 4)

      j += i & 0xf;



    return j % 10;

  }



  private static byte[] reverseBytes(byte ab[])

  {

    byte [] aout = new byte[ab.length];

    for(int i=0; i < ab.length; ++i)

      aout[i] = ab[ab.length -i - 1];

    return aout;

  }



  private static String getKey(long machineId, long unixTime)

  {

    int i = (int)(machineId & -1);

    int j = (int)(machineId >> Integer.SIZE & -1);

    int i1 = i + 0xf5ef08cb + 0x11223344 & -1;

    int j1 = (j - 0xbb87db7) + 0x55667788 & Integer.MAX_VALUE;



    ByteBuffer bb = ByteBuffer.allocateDirect(8);

    bb.putInt(j1);

    bb.putInt(i1);

    bb.rewind();

    long l = bb.getLong();

    int d = (int)unixTime ^ 0x56739acd;



    return String.format("%dZ%d%d", l, d, sum(d));

  }



  public static void main(String [ ] args)

  {

    long machineId = 0;

    String sn = getSN();



    try {

      MessageDigest md = MessageDigest.getInstance("MD5");

      byte[] ba = reverseBytes(md.digest(sn.getBytes()));

      ByteBuffer bb = ByteBuffer.allocateDirect(ba.length);



      bb.put(ba);

      bb.rewind();

      machineId = bb.getLong(Long.SIZE / Byte.SIZE);

    } catch (Exception e) {

      System.out.println("Error: " + e);

    }

    System.out.println("Machine Serial: " + sn);

    long unixTime = System.currentTimeMillis() / 1000L + 86400 * 365 * 3 - 86400 * 13;

    System.out.println("Demo Key: " + getKey(machineId, unixTime));

  }

}