crypto/ecdh: explicitly reject mismatched curves in ECDH

Return an explicit error when PrivateKey.ECDH is called with a PublicKey
which uses a different Curve. Also document this requirement, even
though it is perhaps obvious.

Fixes #58131

Change-Id: I739181a3f1283bed14fb5ee7eb78658b854d28d8
Reviewed-by: Filippo Valsorda <>
TryBot-Result: Gopher Robot <>
Reviewed-by: Tatiana Bradley <>
Auto-Submit: Roland Shoemaker <>
Run-TryBot: Roland Shoemaker <>
2 files changed
tree: 201dd2d81773ba6c691e348d64652fa124148be9
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  12. go.env

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