[curves] Balancing reduced-radix and full-radix performance for extra-strength primes

[Michael Hamburg]

> On Jan 19, 2015, at 3:08 PM, Michael Hamburg <mike at shiftleft.org> wrote:
> 
> Seems fine to me.  The prime 2^398 - 21 did bug me a little bit for this reason.

Err,  2^389 - 21.

— Mike
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