The Hardware AES uses differend MAgic constant (Seed?) that many popular software implementations (If I recall, reading from somewhere). So the initial state of non HW accelerated implementation should match the HW one, that's all.
PS: Can't remember the details just pumped into this one, that I once stumbled upon some article talking about that On Sat, Sep 5, 2015 at 9:50 PM, Leyne, Sean <s...@broadviewsoftware.com> wrote: > Jim and Boris, > > > Something you may want to investigate is replacing the "pure C" > > implementation of ChaCha20 with the rotate step replaced with either a > > compiler intrinsic (Microsoft) or a bit of assembler (gcc). SHA1 has > > the same issue. I haven't a clue as to why popular crypto algoritms > > use a rotate, virtually all microprocessors have rotate instructions, > > but C lacks a rotate operator and the standard libraries neglect to > support it. > > Forgive my naïve point of view, but given that AES instruction set has > been built into AMD and Intel CPUs since 2011, why do you feel that it is > necessary to push for ChaCha20***? > > To my reading, Boris' numbers have shown that AES performance is more than > adequate (53.2 AVG seconds to process 256MB = 4+MB/s). > > Further, considering that the use can is the encryption of data blocks > which would be much smaller than even 1MB, will be performance difference > really be noticeable? > > > Sean > > *** Separately, with Intel HyperThreaded CPUs and considering that AES in > "on-chip" wouldn't that allow the core processing the encryption to shift > to focus on the other thread instruction while the first thread wait for > the on chip AES processor operates? In other words, isn't it possible that > ChaCha20 is only faster when CPUs are being "single minded" and that real > world performance on a server dealing with several tasks might favor CPUs > with native AES instructions? > > > > Here are numbers: > > ---------------------------------------------------------------------- > > ------- AES, BOTAN based code, with AES-NI instruction set all enc > > ------------ > > 531.1 53.2 > > > > ---------------------------------------------------------------------- > > > > AES, INTEL based code, with AES-NI instruction set all enc > > ------------ > > 544.8 76.6 > > > > > > ---------------------------------------------------------------------- > > AES, code based on Bouncy Castle (Java) , without AES-NI instruction set > > all enc > > ------------ > > 2071.8 1620.6 > > > > > > ---------------------------------------------------------------------- > > ChaCha20, code based on Bouncy Castle (Java) > > ------------ > > 1712.7 1234.8 > > > > ------------------------------------------------------------------------------ > Firebird-Devel mailing list, web interface at > https://lists.sourceforge.net/lists/listinfo/firebird-devel >
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