🚀 go-pugleaf

In article <1992Nov6.130523.5725@cubetech.com> andrew@cubetech.com (Andrew Loewenstern) writes:
>In article <lfj225INN675@ai.cs.utexas.edu> yu@cs.utexas.edu (Yeong-Ho Yu) writes:
>>Several months ago, there was a mention on a public domain software which
>>calculates some type of checksum of a file.  I believe it was included
>>in the distribution of another software which required a root privilege to
>>install.
>>

My SLIP software is distributed along with a standalone-command, md5,
to compute MD5 message digests of file.  The software is also
distributed with a list of the valid MD5 digests; the intent is that
you can use this to verify that the file arrived intact during
transmission and other transport.

>there's always the unix 'sum' command.  If you really, really have to
>know if the data has been changed, I have a object that I wrote that
>calculates the MD5 of an NXStream.  MD5 is "Message-Digest 5."  It's a
>128-bit message-digest algorithm from the good folks (ha) at RSA Data
>Security.  It's public domain, but I think if you use in your software
>you have to put something like "MD5 From RSA Data Security" on the
>info-panel...

The UNIX 'sum' command is pretty much worthless if you are trying to
detect intentional modification of a file.  The whole point of message
digest algorithms like MD2 and MD5 is that it is computationally
infeasible to produce plaintext that will result in a given digest.
Both MD2 and MD5 compute a 16 BYTE digest of the given plaintext
input.

The MD5 program supplied in the SLIP_920904 software is just the code
provided in the MD5 specificaion as a reference implementation, if you
are looking for the source code.

louie