MSVC compiles Donna into variable time code. I don't know what to do when you can't trust multiplication. Maybe just break compilation?https://twitter.com/veorq/status/820935203094982656 …
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Do constant-time the way you always have to, the only way that works: spin up to a constant upper bound runtime.
while(current_time() < start_time+2*measured_max_runtime);
That's tremendously expensive. There's no hole in the constant-time discipline, but it does appear to need asm to meet it.
Only if it's actually the bottleneck, which is plausible in some cases but not common.
some people are trying to write crypto code that does not reveal secrets to all the other VMs around them
That's hard for lots of reasons much bigger than variable mul timing, but spinning seems to fix this one channel reliably.
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