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Restyle Add ephemeral key allocator to FabricTable #20083

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@restyled-io restyled-io bot commented Jun 28, 2022

A duplicate of #20082 with additional commits that automatically address
incorrect style, created by Restyled.

⚠️ Even though this PR is not a Fork, it contains outside contributions.
Please review accordingly.

Since the original Pull Request was opened as a fork in a contributor's
repository, we are unable to create a Pull Request branching from it with only
the style fixes.

The following Restylers made fixes:

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tcarmelveilleux and others added 2 commits June 28, 2022 17:54
- CASE requires P256 ephemeral keys
- CASE had a hack whereby "single slots" ephemeral keys
  for NXP HSM were used, which cannot work for multiple CASE
  session establishments
- Using raw P256Keypair prevents being able to use OS-backed
  or HW-backed keys, like can be done for operational keys

Issue #20036

This PR:

- Adds a way to get CASE ephemeral keys from the OperationalKeystore
  abstraction
- Funnels their access via the FabricTable
- Removes some HSM hacks (cannot remove all HSM usage just yet)
  in a way that now OperationalKeystore targeting NXP HSM could
  do the right thing

Testing done:

- Unit tests still pass
- Integration tests still passa
- Added unit tests to validate usage of new APIs
- Ran valgrind on the unit tests, found no leaks
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