[curves] Curve448

[Jason A. Donenfeld]

Hey Mike,

Thanks again for putting this together. Lots of fun to play with. In
case you're curious, I've attached here my "respin" of your
implementation, making it suitable for kernelspace. The "#ifdef
__SIZEOF_INT128__" might be of note for your WBITS to-do comment.
Sending this to you in case its of interest to see an example of how
it might be used.

Jason
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