Hi,

As anybody (efficiently) tackled suntracting two binary! values. I want 
to compute the difference between two 160 bit SHA1 keys, with the 
outcome a new binary. And I also need addition which sould be circular 
in 160bit space. E.g 2^160 + 1 = 1

Before re-inventing yet another wheel I'd thought I'd ask to see if 
anybody has already written this.

--Maarten
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