I believe the answer is yes. The initial implementation was not correct, this 
update fixes the problem. 

I say - if nobody gives a good reason why the incorrect behavior should be 
offered (even upon request), no need to bother.


> On Feb 13, 2018, at 9:40 , Jeffrey Walton <noloa...@gmail.com> wrote:
> 
> Hi Everyone,
> 
> We need to change Simon and Speck to align with the algorithmic description 
> provided by the Simon and Speck team. Formerly, we followed the team's test 
> vectors, but they turned out to be wrong. Ugh...
> 
> We are tracking the issue at https://github.com/weidai11/cryptopp/issues/585.
> 
> Simon and Speck have been part of the library for about 30 days. I think we 
> can make the change without providing a 2nd set of classes with former 
> behavior. "Former behavior" means the existing incorrect behavior. That is 
> assuming no one is using them at this moment.
> 
> My question is, is it OK to make the change without providing the second set 
> of classes?
> 
> Jeff
> 
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