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Some z/Architecture processors can compute a SHA-3 digest in a single instruction. arch/s390/crypto/ already uses this capability to optimize the SHA-3 crypto_shash algorithms. Use this capability to implement the sha3_224(), sha3_256(), sha3_384(), and sha3_512() library functions too. SHA3-256 benchmark results provided by Harald Freudenberger (https://lore.kernel.org/r/4188d18bfcc8a64941c5ebd8de10ede2@linux.ibm.com/) on a z/Architecture machine with "facility 86" (MSA level 12): Length (bytes) Before (MB/s) After (MB/s) ============== ============= ============ 16 212 225 64 820 915 256 1850 3350 1024 5400 8300 4096 11200 11300 Note: the original data from Harald was given in the form of a graph for each length, showing the distribution of throughputs from 500 runs. I guesstimated the peak of each one. Harald also reported that the generic SHA-3 code was at most 259 MB/s (https://lore.kernel.org/r/c39f6b6c110def0095e5da5becc12085@linux.ibm.com/). So as expected, the earlier commit that optimized sha3_absorb_blocks() and sha3_keccakf() is the more important one; it optimized the Keccak permutation which is the most performance-critical part of SHA-3. Still, this additional commit does notably improve performance further on some lengths. Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Tested-by: Harald Freudenberger <freude@linux.ibm.com> Link: https://lore.kernel.org/r/20251026055032.1413733-13-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org>
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 reStructuredText 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.