[rc5] Blocks

Tim Charron tcharron at interlog.com
Fri Oct 24 21:21:34 EDT 1997


> Another thing is (for those who have read the paper) that the algorithm
> has
> a + operation. It sais is the modulo-2^w addition. What is this?
> How can I implement this in C?

This is an exclusive or operation.  In C, it's denoted by the ^ 
character.

> PS: Isn't there a c programm for performing the algorithm? For exmple
> the
> libdes library has a program mnamed des.

C is quite slow for this.  Look at the 'v1' source for rc5-56 to 
see how it works.


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