crypto/elliptic: make IsOnCurve return false for invalid field elements

Thanks to Guido Vranken for reporting this issue.

Fixes #50974
Fixes CVE-2022-23806

Change-Id: I0201c2c88f13dd82910985a495973f1683af9259
Reviewed-on: https://go-review.googlesource.com/c/go/+/382455
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Trust: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
Trust: Katie Hockman <katie@golang.org>
5 files changed
tree: 30fe4d8c7342e0a33e335c6cbf8e4f9a797589a7
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. codereview.cfg
  12. CONTRIBUTING.md
  13. CONTRIBUTORS
  14. LICENSE
  15. PATENTS
  16. README.md
  17. SECURITY.md
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