Generate Serial Number for my Program

I am trying to figure out the best way for users to "register" the program I am writing.

Here are my simple guidelines:

1. The program should be able to be registered without an internet connection.

2. The registration dialog box consists of a USERNAME and SERIAL NUMBER edit control.

I would like some high level suggestions on how to make sure the serial number is unique to each user BASED upon their USERNAME.

Of course we have some CONSTANTS I have available to me, for each user, which could be used to generate the final serial number.

a. hard drive serial
b. time info ( day, month, etc )
c. other WIN32 api return values that are consistent....

So, I would like some ideas on a simple algorithm based on the username.

All sincere suggestions will receive points.

I would LOVE a solution (suggestion) that I could actually put into production - not necessarily code, but a detailed suggestion - KEEP IN MIND PLEASE, I am only an intermediate C++ programmer, lol.

Who is Participating?
jkrConnect With a Mentor Commented:
If you are after a unique serial number based on the user's machine, try a GUID:

#include <objbase.h>
#include <stdio.h>

#pragma comment(lib,"ole32.lib")

void GenerateGUID(char* pBuf) {

  GUID guid;

        guid.Data1, guid.Data2, guid.Data3,
        guid.Data4[0], guid.Data4[1], guid.Data4[2], guid.Data4[3],
        guid.Data4[4], guid.Data4[5], guid.Data4[6], guid.Data4[7]);


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edvinsonAuthor Commented:
Great solution, JKR. This solution never occurred to me.
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