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39d13a1ac4
Instead of instantiating a separate cipher to perform the encryption needed to produce the IV, reuse the skcipher used for the block data and invoke it one additional time for each block to encrypt a zero vector and use the output as the IV. For CBC mode, this is equivalent to using the bare block cipher, but without the risk of ending up with a non-time invariant implementation of AES when the skcipher itself is time variant (e.g., arm64 without Crypto Extensions has a NEON based time invariant implementation of cbc(aes) but no time invariant implementation of the core cipher other than aes-ti, which is not enabled by default). This approach is a compromise between dm-crypt API flexibility and reducing dependence on parts of the crypto API that should not usually be exposed to other subsystems, such as the bare cipher API. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Milan Broz <gmazyland@gmail.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> |
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| README | ||
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.