Using Md5Digest on stacks loaded in memory

[Alejandro Tejada]

Hi Developers,

Recently, i had been working on
refining some of my stacks for distribution
among fellow teachers and i had been 
experimenting with security issues.

I'll like that my player app verify
that the stacks that i send them were
not tampered in any way, so i'm working
in a verification system that could use
the built-in md5digest function.

I could verify the md5digest of a stack stored 
in the hard disk with the following code:

put url "binfile:C:/WINDOWS/Escritorio/myStack.rev"
into zxs 
-- zxs is a local variable
put binaryDecode("H*",md5Digest(zxs),tHexDigest)
-- convert the binary data of md5digest in hexadecimal
put tHexDigest
-- write the results in the message box

and could verify the md5digest of a file stored
as a custom property with the following code:

set the customProperty_01 of the topstack to url
"binfile:C:/WINDOWS/Escritorio/md5sums.exe"
-- i have included the file within the topstack
put binaryDecode("H*",md5Digest(the customProperty_01
of the topstack),tHexDigest)
-- converting in hexadecimal the binary result of the
md5digest function
put tHexDigest
-- write the results in the message box

But, How could i get the md5Digest of a
stack loaded in memory?

This code does not works in my side:

put binaryDecode("H*",md5Digest(the
topstack),tHexDigest)
put tHexDigest

It produces a different result than the
code that reads the stack from the Hard Disk...

Thanks in advance for your help.

My best wishes for this new year! :-)

al

=====
Visit my site:
http://www.geocities.com/capellan2000/


		
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