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Re: Generating CheckSum for AMD64 Executable

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Am 01.05.19 um 14:39 schrieb Paul McKneely:
> Hi,
> 
> I have written an assembler and library manager targeting AMD64
> using OpenWatcom 1.8. I am currently writing a Linker. Source
> code is in C (not C++).  Though the OW suite I am using is 32-bits,
> I don't see any reason why it can't be used to write software that can
> create 64-bit running target programs.
> 
> The Optional Header of the AMD64 Exe has a field called CheckSum
> at offset 64. The PE specification I am using says the following to
> describe
> the field that must be filled in within an EXE file:
> 
> "The image file checksum. The algorithm for computing the checksum
> is incorporated into IMAGHELP.DLL. The following are checked for
> validation at load time: all drivers, any DLL loaded at boot time, and
> any DLL that is loaded into a critical Windows process."
> 
> Has anyone done this? Certainly the OW linker gets this field
> completed for the 32-bit executables that it generates. Perhaps
> the algorithm is the same. Is it possible to get the OW tool suite
> that I am using to perform this action?
> 
> Thanks.
> 

Look at the OW Linker source at the website:

openwatcom.org

Direct jump to the source:

http://perforce.openwatcom.org:4000/@md=d&cd=//depot/openwatcom/bld/wl/c/&c=lzi@//depot/openwatcom/bld/wl/c/loadpe.c?ac=22

Frank

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Generating CheckSum for AMD64 Executable Paul McKneely <pkmckneely@sbcglobal.net> - 2019-05-01 07:39 -0500
  Re: Generating CheckSum for AMD64 Executable Frank Beythien <fbeythien@gmx.de> - 2019-05-01 17:10 +0200

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