PureBasic Forum

Files :
-------

PureValid      : user library
PureValid.exe  : validation tool
(PureUPX.exe   : compression / scrambling / validation tool)

What for ?
----------

PureValid is a library with one function : PureValid_CheckFile(Key.s)
It is intended to check an EXE integrity at runtime, by calculating
a fingerprint and comparing it to a validation info located at the
end of the EXE. This validation info is generated by PureValid.exe
or PureUPX.

How ?
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Place the library PureValid in the %PureBasic%\PureLibraries\UserLibraries
directory, and the tool PureValid.exe in the directory where you have your
compiled applications.

1. In your application YourApp.pb, only add one line :

   PureValid_CheckFile("YourEncryptionKey")
    or
   Valid = PureValid_CheckFile("YourEncryptionKey")
   ; Valid = 1 if EXE is valid,
   ;         0 if EXE is corrupt (program stops)

2. Compile your application as usual

3. Validate your application with PureValid.exe :
   
   PureValid YourApp.exe "YourEncryptionKey"

4. It's done. Now if something / someone changes your application, it does not
   run anymore. Try to change it's name or patch it, and see the result.

NB : you can also use PureUPX to validate your application after compressing
    (+/- scrambling). If the PureValid library is installed, you will see an
     extra PureValid section when you start PureUPX.

NB2 : it's only an integrity check, so it's a very lame protection against
      hackers...