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The new bitsliced NEON implementation of AES uses a fallback in two places: CBC encryption (which is strictly sequential, whereas this driver can only operate efficiently on 8 blocks at a time), and the XTS tweak generation, which involves encrypting a single AES block with a different key schedule. The plain (i.e., non-bitsliced) NEON code is more suitable as a fallback, given that it is faster than scalar on low end cores (which is what the NEON implementations target, since high end cores have dedicated instructions for AES), and shows similar behavior in terms of D-cache footprint and sensitivity to cache timing attacks. So switch the fallback handling to the plain NEON driver. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.