tree 34b9e033b766c93b7b3cc9391e4ea267b7dcf12a
parent fa47b1d0f9d3d30601d7e5ed158d3055cbe6ff44
author Lily Chen <chlily@google.com> 1758554667 -0400
committer Boringssl LUCI CQ <boringssl-scoped@luci-project-accounts.iam.gserviceaccount.com> 1758555629 -0700

Forbid setting EC public key to point at infinity

The point at infinity is not a valid EC public key. We already refuse to
parse it. This CL makes it forbidden to set an EC public key to a
manually-constructed point at infinity.

This change will allow callers to assume that ECDH is infallible
given a valid peer public key.

Update-Note: EC_KEY_set_public_key will now return an error if
configuring the point at infinity as a public key. This does not impact
parsing, which already rejected such a point, and the resulting key
would have failed all operations already.

Change-Id: I202307a510543f4305b1cb46094d2c83174047af
Fixed: 438493754
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/81267
Commit-Queue: Lily Chen <chlily@google.com>
Reviewed-by: David Benjamin <davidben@google.com>