If you thought RdRand caused a lot of chatter on this list, we've just
announced a new sister instruction.. RdSeed.
It's here.. http://software.intel.com/file/45207
RdSeed is SP800-90B &C and X9.82 parts 2 & 4 compliant in the XOR
construction. But they're all draft specs so things could change.
RdSeed is to RdRand as /dev/random is to /dev/urandom. It returns 100%
entropy (minus epsilon if you're picky).
Since it is dependent on the supply of entropy and has quite a
conservative conditioning ratio, its maximum throughput is less than
that of RdRand.
We haven't released anything other documentation on this yet, so until
we do, this is as good a place to ask questions as any.
DJ
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