Attempt at constification generates questions...

[Richard Levitte - VMS Whacker]

I tried to constify the BIGNUM arguments to a few BN functions, among
others BN_mul() (all but r).  However, in BN_mul(), there's the
BN_RECURSION case that will only occur when the lengths of a and b are
1 word from each other (if I understand correctly), and where a and b
get expanded so the get the same length.

I wonder, how much do we gain from BN_RECURSION?  Could the whole
thing be done in a way that doesn't need expanding a or b, so they can
be const?

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