As you say it is a course assignment, there is an option. Find the
standard definition, and give it to your students to code it up from the
standard.
This is actually quite a good exercise because it gets into the arcania
of C numbers definitions. Also, the standard definition comes with a
couple of test vectors, so it is possible to know whether you got it right.
As a data point, it took myself and a mate one weekend to code it from
standard, once upon a time. Working together.
Just a thought :)
iang
On 17/02/12 09:33 AM, Jonathan Katz wrote:
I'm looking for a stand-alone implementation of DES in C. Can anyone
point me to one (or send me one of their own)? Note: I know that there
exist C crypto libraries that include DES, but I'd rather not install an
entire library just to get access to DES.
(For those who are curious: this is for a course assignment. Though now
that the students have alerted me to the fact that DES implementations
seem to be hard to find -- doesn't anyone use triple DES? -- I'm also
interested myself in getting my hands on one.)
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