Convert a Win32 CGI to Linux CGI (developed with Lazarus)

I have developed a small CGI (about 400 lines of code) with Lazarus on Windows. I can call it with GET or POST method with some parameters. The CGI use these parameters to generate a string using RSA algorithm (this free class [login to view URL]). Using a web server (for example apache) under Windows and CGI compiled on Windows all works. But if I try to use CGI compiled under Linux (Ubuntu) on Linux web server I don't have the same result. In this case I get a long text because there is same problem (see image). I need help to edit my Lazarus project to works both under Windows and under Linux. I provide all of the code and the php file for testing.