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Filippo Valsorda 778627f331 crypto/internal/nistec: refactor scalar multiplication
The assumptions of some of the assembly functions were still scarcely
documented and even disregarded: p256ScalarMult was relying on the fact
that the "undefined behavior" of p256PointAddAsm with regards to
infinity inputs was returning the infinity.

Aside from expanding comments, moving the bit window massaging into a
more easily understood p256OrdRsh function, and fixing the above, this
change folds the last iteration of p256ScalarMult into the loop to
reduce special cases and inverts the iteration order of p256BaseMult so
it matches p256ScalarMult for ease of comparison.

Updates #58647

Change-Id: Ie5712ea778aadbe5adcdb478d111c2527e83caa0
Reviewed-on: https://go-review.googlesource.com/c/go/+/471256
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
2023-03-13 18:55:22 +00:00
.github .github: suggest using private browsing in pkgsite template 2023-01-03 18:52:47 +00:00
api bytes: add Buffer.Available and Buffer.AvailableBuffer 2023-03-13 17:03:14 +00:00
doc doc: start draft Go 1.21 release notes 2023-02-22 18:53:00 +00:00
lib/time time/tzdata: generate zip constant during cmd/dist 2023-01-17 22:30:53 +00:00
misc runtime/cgo: add tsan sync for traceback function 2023-03-08 20:11:59 +00:00
src crypto/internal/nistec: refactor scalar multiplication 2023-03-13 18:55:22 +00:00
test cmd/compile: reorder operations in SCCs to enable more inlining 2023-03-09 22:13:26 +00:00
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.gitignore time/tzdata: generate zip constant during cmd/dist 2023-01-17 22:30:53 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
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go.env cmd/go: introduce GOROOT/go.env and move proxy/sumdb config there 2023-01-17 23:10:39 +00:00
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SECURITY.md SECURITY.md: replace golang.org with go.dev 2022-04-26 19:59:47 +00:00

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