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This is a reimplementation of the NEON version of the bit-sliced AES algorithm. This code is heavily based on Andy Polyakov's OpenSSL version for ARM, which is also available in the kernel. This is an alternative for the existing NEON implementation for arm64 authored by me, which suffers from poor performance due to its reliance on the pathologically slow four register variant of the tbl/tbx NEON instruction. This version is about ~30% (*) faster than the generic C code, but only in cases where the input can be 8x interleaved (this is a fundamental property of bit slicing). For this reason, only the chaining modes ECB, XTS and CTR are implemented. (The significance of ECB is that it could potentially be used by other chaining modes) * Measured on Cortex-A57. Note that this is still an order of magnitude slower than the implementations that use the dedicated AES instructions introduced in ARMv8, but those are part of an optional extension, and so it is good to have a fallback. 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.