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The extra digest copy was introduced by an erroneous merge conflict resolution
for commit "crypto routines: Hint minimum buffer sizes to the compiler".
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and when doing it, consistently use explicit_bzero().
Update manual pages to match the behavior.
Reviewed by: pfg, allanjude, jmg
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D16316
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Like SHA2-384:SHA2-512, SHA2-224 is simply a truncated SHA2-256 with a
different initial vector. Add to round out the complete basic SHA2 family.
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with more ILP and a preference for memory load instructions over large code
footprints with embedded immediate variables.
On amd64 CPUs from 2007-2008 there is not a significant change, but
amd64 CPUs from 2009-2010 get roughly 10% more throughput with this
code; amd64 CPUs from 2011-2012 get roughly 15% more throughput; and
AMD64 CPUs from 2013-2015 get 20-25% more throughput. The Raspberry
Pi 2 increases its throughput by 6-8%.
Sponsored by: Tarsnap Backup Inc.
Performance tested by: allanjude
MFC after: 3 weeks
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Use the C99 'static' keyword to hint to the compiler IVs and output digest
sizes. The keyword informs the compiler of the minimum valid size for a given
array. Obviously not every pointer can be validated (i.e., the compiler can
produce false negative but not false positive reports).
No functional change. No ABI change.
Sponsored by: EMC / Isilon Storage Division
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