Commits on Nov 27, 2024

1. EC_AffinePoint API improvements …

   This adds point negation and point addition.
   
   Point addition is not particularly efficient since it converts the
   result immediately to an affine coordinate, as we do not currently
   expose projective points at all. That said it is more than sufficient
   for simple protocols that just need to add a few points together.
   
   This also corrects the return result of EC_AffinePoint::mul_px_qy,
   which would previously crash if the resulting point was the identity
   element. Instead it should return nullopt.
   
   Discussion in #4027

   

   randombit committed Nov 27, 2024
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