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Add a local implementation of FCrypt-PCBC encryption and decryption.
This will be used instead of the crypto API one, allowing the crypto API
one to be removed. It will also simplify rxkad.c quite a bit.
A KUnit test is included. The FCrypt-PCBC test vectors are borrowed
from the existing ones in crypto/testmgr.h. Note that this adds the
first KUnit test for net/rxrpc/, which previously had no KUnit tests.
The FCrypt code is based on crypto/fcrypt.c, but I simplified it a bit.
The PCBC part is straightforward and I just wrote it from scratch.
Tested with:
kunit.py run --kunitconfig net/rxrpc/
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Tested-by: Marc Dionne <marc.dionne@auristor.com>
Link: https://patch.msgid.link/20260522050740.84561-2-ebiggers@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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