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Code cribbed from Andrew Moon's Public Domain SipHash-2-4
implementation (which IMO is also cleaner).
Fixes bug 17544.
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The compiler is allowed to assume that a "uint64_t *" is aligned
correctly, and will inline a version of memcpy that acts as such.
Use "uint8_t *", so the compiler does the right thing.
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Because in 95 years, we or our successors will surely care about
enforcing the BSD license terms on this code. Right?
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fixes bug 11426; bugfix on 0.2.5.3-alpha, where csiphash was
introduced.
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In digestmap_set/get benchmarks, doing unaligned access on x86
doesn't save more than a percent or so in the fast case. In the
slow case (where we cross a cache line), it could be pretty
expensive. It also makes ubsan unhappy.
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This corrects a linker error on OpenBSD, where the function is called letoh64. See also http://git.kernel.org/cgit/docs/man-pages/man-pages.git/tree/man3/endian.3#n84.
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This completes our conversion to using siphash for our hash functions.
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siphash is a hash function designed for producing hard-to-predict
64-bit outputs from short inputs and a 128-bit key. It's chosen for
security and speed.
See https://131002.net/siphash/ for more information on siphash.
Source: https://github.com/majek/csiphash/
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