I've just integrated the Mozilla SHA1 library implementation that Adgar
Toernig sent me into the standard git archive (but I did the integration
The Mozilla SHA1 code is copyright Paul Kocher and Cryptography Research,
and is released under a dual MPL/GPL license. Git obviously uses it in the
GPL version, but I left the MPL choice there too, so that those two files
(that are in a subdirectory of its own) will continue to be dual-licensed.
NOTE! I left git using the openssl libraries by default, and this is a
built-time choice in the makefile. You can choose the Mozilla SHA1
implementation by doing
but I suspect that anybody that has openssl installed and is working on an
x86 is much better off with the i586-optimized openssl version. But if you
don't have openssl by default, or if you don't like openssl for some other
reason, you now have a nice easy choice.
Interestingly, the Mozilla SHA1 code is about twice as fast as the openssl
code on my G5, and judging by the disassembly, it's because it's much
simpler. I think the openssl people have unrolled all the loops totally,
which tends to be a disaster on any half-way modern CPU. But hey, it could
be something as simple as optimization flags too.
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