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Generating CheckSum for AMD64 Executable

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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.

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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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