On 2015-03-27, Theo de Raadt <dera...@cvs.openbsd.org> wrote: >>> promote chacha20-poly1...@openssh.com to be the default cipher; >> >>FWIW, Poly1305 uses _a lot_ of multiplications. I expect it to >>perform poorly with SPARC V7 code. > > Well, I don't think the world will fall over as a result.
Frankly, I think sparc is dead and support should be dropped. But since I can't dictate how people spend their time, I thought I'd mention this issue for the very few who care. Don't get me wrong, I fully support the switch to chacha20-poly1...@openssh.com. > Slow machines becoming slower, nothing else new :-) Sure, but I think this is an instance of slow machines becoming disproportionately slower. Poly1305 may be mathematically elegant, but djb's propaganda about its performance is to be taken with a lump of salt. Unsurprisingly it's geared towards modern CPUs. For Poly1305 to perform well, you want a CPU that can execute several multiplications in parallel. A single multiplier is already a bottleneck, and having no hardware multiplication at all, like SPARC V7, must be really bad. That's all theory on my part. I don't have a sparc to test. (No, thanks.) -- Christian "naddy" Weisgerber na...@mips.inka.de
