[release-branch.go1.7] crypto/elliptic: fix carry bug in x86-64 P-256 implementation.

Patch from Vlad Krasnov and confirmed to be under CLA.

Fixes #20040.

Change-Id: Ieb8436c4dcb6669a1620f1e0d257efd047b1b87c
Reviewed-on: https://go-review.googlesource.com/41070
Run-TryBot: Adam Langley <agl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
(cherry picked from commit 9294fa2749ffee7edbbb817a0ef9fe633136fa9c)
Reviewed-on: https://go-review.googlesource.com/43773
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Chris Broadfoot <cbro@golang.org>
2 files changed
tree: 7b54623f61019883bbb7586297507796431d1b96
  1. .gitattributes
  2. .github/
  3. .gitignore
  4. AUTHORS
  5. CONTRIBUTING.md
  6. CONTRIBUTORS
  7. LICENSE
  8. PATENTS
  9. README.md
  10. VERSION
  11. api/
  12. doc/
  13. favicon.ico
  14. lib/
  15. misc/
  16. robots.txt
  17. src/
  18. test/
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