currect = 0xeaaeb43e477b8487 # = 16910651830403040391, -1536092243306511225
mul = 26729
 
guess = ''
 
1.upto(16) do |pos|
  0.upto(15) do |hex|
    if ((sprintf("%x", hex) << guess).to_i(16) * mul) & ((16**pos)-1) == (currect & (16**pos)-1)
      guess = sprintf("%x", hex) << guess
      break
    end
  end
end
 
answer = guess.to_i(16)
 
puts sprintf("%x", answer)
puts sprintf("%d", answer)
puts sprintf("%d", answer -1 - (16**16-1))
 
# answer = 0x83676f67696c676f, 9468659231510783855, -8978084842198767761
 
 
# java class source
__END__
 
// Decompiled by DJ v3.6.6.79 Copyright 2004 Atanas Neshkov  Date: 2013-05-06 오후 7:17:08
// Home Page : http://m...content-available-to-author-only...y.com/neshkov/dj.html  - Check often for new version!
// Decompiler options: packimports(3)
// Source File Name:   JavaCrackMe.java
 
import java.io.PrintStream;
 
public class JavaCrackMe
{
 
    public JavaCrackMe()
    {
    }
 
    public static final synchronized volatile transient void main(String args[])
    {
        try
        {
            System.out.println("Reversing.Kr CrackMe!!");
            System.out.println("-----------------------------");
            System.out.println("The idea came out of the warsaw's crackme");
            System.out.println("-----------------------------\n");
            long l = Long.decode(args[0]).longValue();
            l *= 26729L;
            if(l == 0xeaaeb43e477b8487L)
                System.out.println("Correct!");
            else
                System.out.println("Wrong");
        }
        catch(Exception exception)
        {
            System.out.println("Please enter a 64bit signed int");
        }
    }
}

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