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Add support for AES-CCM to the crypto library.
This will be used to provide a streamlined implementation of the
"ccm(aes)" crypto_aead algorithm. Most users of "ccm(aes)" will also be
able to switch to the library, which as usual will be faster and
simpler, e.g.:
- fs/smb/client/
- fs/smb/server/
- net/mac80211/
- net/mac802154/
(I've already written proof-of-concept patches for all the above, and
they helped inform the API design.)
As in the AES-GCM API, incremental operation is supported. It has to be
used carefully, especially when decrypting, but it makes the API general
enough to work well for all users.
The AES-CCM library code calls aes_cbcmac_blocks() directly, bypassing
the higher-level aes_cbcmac_init(), aes_cbcmac_update(), and
aes_cbcmac_final(). The latter set of functions is useful only for
AES-CCM, so they don't make sense to keep around and will be removed
once the "ccm(aes)" crypto_aead starts using the AES-CCM library.
Initial test coverage is provided by the crypto_aead support added in a
later commit. I'm planning a KUnit test suite as well.
Link: https://patch.msgid.link/20260715221153.246410-8-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
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