Make Richelot isogeny chains subquadratic #9
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The previous patch reduced the number of squaring operations in the Jacobian from n^2/2 to about n^2/16 + 4*n. By adjusting which point power is cached and passed to the next iteration we can obtain a O(n^1.5) complexity. This provides a modest 10-15% speedup for large keys.
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The previous patch reduced the number of squaring operations
in the Jacobian from n^2/2 to about n^2/16 + 4*n.
By adjusting which point power is cached and passed to
the next iteration we can obtain a O(n^1.5) complexity.
This provides a modest 10-15% speedup for large keys.