use precompute for verification

this was originally part of the jacobi code (merged just before this commit) but was unintentionally dropped during rebases
tlsfuzzer · Dec 2, 2019 · 8deb089 · 8deb089
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commit 8deb089
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/src/ecdsa/ellipticcurve.py b/src/ecdsa/ellipticcurve.py
@@ -534,6 +534,10 @@ def mul_add(self, self_mul, other, other_mul):
           return other * other_mul
       if not isinstance(other, PointJacobi):
           other = PointJacobi.from_affine(other)
+      # when the points have precomputed answers, then multiplying them alone
+      # is faster (as it uses NAF)
+      if self.__precompute and other.__precompute:
+          return self * self_mul + other * other_mul
 
       if self.__order:
           self_mul = self_mul % self.__order