Re: [PATCH v2 04/13] lib/crypto: aes: Add CTR and XCTR support

[Thomas Huth]

On 16/07/2026 00.11, Eric Biggers wrote:
> Add support for AES-CTR and AES-XCTR to the crypto library.
>
> These will be used to provide streamlined implementations of the
> "ctr(aes)" and "xctr(aes)" crypto_skcipher algorithms.  Most users of
> "ctr(aes)" will also be able to switch to the library, which as usual
> will be simpler and faster, e.g.:
>
>    - net/mac80211/fils_aead.c
>    - net/mac802154/llsec.c
>
> As usual, the architecture-optimized AES-CTR and AES-XCTR code will be
> migrated into the library as well (using the hooks provided in this
> commit), eliminating lots of repetitive boilerplate code.
>
> This is also a prerequisite for supporting AES-GCM, AES-CCM, and
> AES-HCTR2 in the crypto library.
>
> Initial test coverage is provided by the crypto_skcipher support added
> in a later commit.  I'm planning a KUnit test suite as well.
>
> Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
> ---
>   .../crypto/libcrypto-unauth-encryption.rst    |  7 ++
>   include/crypto/aes-ctr.h                      | 65 +++++++++++++
>   lib/crypto/Kconfig                            |  6 ++
>   lib/crypto/aes.c                              | 96 +++++++++++++++++++
>   lib/crypto/tests/Kconfig                      |  1 +
>   5 files changed, 175 insertions(+)
>   create mode 100644 include/crypto/aes-ctr.h
Reviewed-by: Thomas Huth <thuth@xxxxxxxxxx>