[plt-scheme] BitField

Got it. :)
Great! Thanks.

Jens Axel Søgaard wrote:
>  For list-related administrative tasks:
>  http://list.cs.brown.edu/mailman/listinfo/plt-scheme
> 
> Paulo Jorge O. C. Matos wrote:
> 
>> I have to check out your references. No, I saw the bitwise operations 
>> but I also tried to implemented SHA-1 hashing algorithm that uses alot 
>> of shifts, etc. How do you manage to do a shift with the bitwise 
>> operations available?
> 
> 
> Shifting is done with arithmetic-shift.
> 
> Rotation is done like this:
> 
> /(define (word<<< n s)
> //  (bitwise-ior (arithmetic-shift n s) //               
> (arithmetic-shift n (- s 32))))/
> 
> The <<< notation was chosen in order to mimic the notation of the MD5 RFC.
> 


-- 
Paulo J. Matos : pocm(_at_)mega.ist.utl.pt
Instituto Superior Tecnico - Lisbon
Software & Computer Engineering - A.I.
  - > http://mega.ist.utl.pt/~pocm
  ---	
	Yes, God had a deadline...
		So, He wrote it all in Lisp!