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looking for anti-tamper software

I used to have this C source that I could embed in a program, and it
would tell me if the software had been tampered with at runtime.  I've
lost/mislaid/whatever the source, and I was wondering if anyone had anything
that would do the same thing.  As I recall, it calculated a simple CRC and
embedded it into the .EXE file (it was written for MS-DOS).

It doesn't need to be cryptographically secure - I just need to check to see
if the executable has been corrupted.  I've leafed through alt.sources and

Thanks in advance...
Ed Carp, N7EKG    			[email protected], [email protected]
					214/993-3935 voicemail/digital pager
Finger [email protected] for PGP 2.5 public key		[email protected]

"Past the wounds of childhood, past the fallen dreams and the broken families,
through the hurt and the loss and the agony only the night ever hears, is a
waiting soul.  Patient, permanent, abundant, it opens its infinite heart and
asks only one thing of you ... 'Remember who it is you really are.'"

                    -- "Losing Your Mind", Karen Alexander and Rick Boyes