mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-01-20 11:09:54 -05:00
948ffc66e5
CCM combines the counter (CTR) encryption mode with a MAC based on the same block cipher. This MAC construction is a bit clunky: it invokes the block cipher in a way that cannot be parallelized, resulting in poor CPU pipeline efficiency. The arm64 CCM code mitigates this by interleaving the encryption and MAC at the AES round level, resulting in a substantial speedup. But this approach does not apply to the additional authenticated data (AAD) which is not encrypted. This means the special asm routine dealing with the AAD is not any better than the MAC update routine used by the arm64 AES block encryption driver, so let's reuse that, and drop the special AES-CCM version. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.