mpn negation with borrow in
tg at gmplib.org
Fri Aug 22 13:53:50 UTC 2014
Vincent Lefevre <vincent at vinc17.org> writes:
I was quite surprised to see that the mpn layer doesn't have a
negation with borrow in,
You will be even more surprised when you see that we don't have any
(public) mpn functions with carry-in.
* if the borrow is 0, use mpn_neg;
* if the borrow is 1, use mpn_com.
Is this the recommended way?
That's how I'd do it. While mpn_com doesn't return "carry out", its
value in this context is quite predictable.
Please encrypt, key id 0xC8601622
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