The bulk of this is the patches I sent out yesterday, but there's a few
added tweaks from today there, and it's now one nice series instead of a
patch followed by a "Haa, I improved on it" etc, so you can get the whole
thing without actually having to hunt for the pieces.
It's a series of 7 patches:
block-sha1: add new optimized C 'block-sha1' routines
block-sha1: try to use rol/ror appropriately
block-sha1: make the 'ntohl()' part of the first SHA1 loop
block-sha1: re-use the temporary array as we calculate the SHA1
block-sha1: macroize the rounds a bit further
block-sha1: Use '(B&C)+(D&(B^C))' instead of '(B&C)|(D&(B|C))' in round 3
block-sha1: get rid of redundant 'lenW' context
where the thing is loosely based on the Mozilla SHA1 routines but by the
end doesn't really resemble them all that much. The Mozilla ones suck
donkey d*ck in so many ways - unnecessary copies, idiotic byte-at-a-time
build-up of the hash input etc.
The end result is pretty much equivalent in performance to the OpenSSL
SHA1 code for me on x86-64. Getting rid of OpenSSL gets rid of another
couple of shared library loadings, and as a result my "make -j64 test" is
now a couple of seconds faster with this than with OpenSSL in my rather
unscientific tests.
The code isn't very big:
Makefile | 9 +++
block-sha1/sha1.c | 158 +++++++++++++++++++++++++++++++++++++++++++++++++++++
block-sha1/sha1.h | 20 +++++++
3 files changed, 187 insertions(+), 0 deletions(-)
create mode 100644 block-sha1/sha1.c
create mode 100644 block-sha1/sha1.h
and passes all my tests. It's really hard to not do the SHA1 right and
still pass any tests at all, so it should all be good.
Enable them with BLK_SHA1=1.
Linus
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