53836a74f8
The current implementation of the extended Euclidean GCD algorithm calculates both cosequences x and y inside the division loop. This is unneccessary since the second Bezout coefficient can be obtained at the end of calculation via a multiplication, subtraction and a division. In case only one coefficient is needed, e.g. ModInverse this calculation can be skipped entirely. This is a standard optimization, see e.g. "Handbook of Elliptic and Hyperelliptic Curve Cryptography" Cohen et al pp 191 Available at: http://cs.ucsb.edu/~koc/ccs130h/2013/EllipticHyperelliptic-CohenFrey.pdf Updates #15833 Change-Id: I1e0d2e63567cfed97fd955048fe6373d36f22757 Reviewed-on: https://go-review.googlesource.com/50530 Reviewed-by: Robert Griesemer <gri@golang.org> |
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