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e39b854a67
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Filippo Valsorda e39b854a67 crypto/elliptic: use complete addition formulas for P-521 
Complete formulas don't have exceptions for P = Q or P = 0, which makes
them significantly simpler and safer to implement. Notice how the
constant time IsZero checks are gone.

It's not free, but still well within the performance gains of CL 315271.

name                    old time/op    new time/op    delta
pkg:crypto/elliptic goos:darwin goarch:amd64
ScalarBaseMult/P521-16    1.34ms ± 3%    1.63ms ± 4%  +21.78%  (p=0.000 n=10+10)
ScalarMult/P521-16        1.35ms ± 3%    1.65ms ± 4%  +22.58%  (p=0.000 n=10+10)
pkg:crypto/ecdsa goos:darwin goarch:amd64
Sign/P521-16              1.45ms ± 2%    1.67ms ± 1%  +15.00%  (p=0.000 n=10+8)
Verify/P521-16            2.68ms ± 1%    3.10ms ± 2%  +16.02%  (p=0.000 n=10+9)
GenerateKey/P521-16       1.31ms ± 4%    1.53ms ± 1%  +16.89%  (p=0.000 n=10+9)

Change-Id: Ibd9a961e9865df68a1250aba739c190caf9a54de
Reviewed-on: https://go-review.googlesource.com/c/go/+/320071
Trust: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Julie Qiu <julie@golang.org>
2021-10-30 16:45:25 +00:00
.github .github: update IRC server 2021-09-30 19:56:27 +00:00
api cmd/go: stamp VCS revision and uncommitted status into binaries 2021-10-14 18:44:37 +00:00
doc Revert "cmd/go: remove support for -buildmode=shared" 2021-10-29 17:32:24 +00:00
lib/time lib/time: fix RFC 6557 url 2021-08-15 02:18:46 +00:00
misc Revert "cmd/go: remove support for -buildmode=shared" 2021-10-29 17:32:24 +00:00
src crypto/elliptic: use complete addition formulas for P-521 2021-10-30 16:45:25 +00:00
test cmd/compile: use Structure() to get single underlying type of typeparam. 2021-10-29 23:25:18 +00:00
.gitattributes
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
AUTHORS net/http: guarantee that the Transport dial functions are respected in js/wasm 2021-10-28 17:57:57 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md
CONTRIBUTORS net/http: guarantee that the Transport dial functions are respected in js/wasm 2021-10-28 17:57:57 +00:00
LICENSE
PATENTS
README.md README.md: update contribute URL 2021-09-30 13:33:21 +00:00
SECURITY.md

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