--- Log opened Wed Apr 23 00:00:23 2025
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03:50 < sipa> Ademan: "constant time" is a misnomer
03:50 < sipa> it is "memory access and code branching does not depend on secret information"
03:51 < sipa> due to various things like L1/L2 cache, branch prediction, frequency scaling, ... rarely is anything but a tiny piece of code actually constant time
03:52 < sipa> but that doesn't matter, as long as those timings are not correlated with secret information
03:53 < sipa> libsecp256k1 has tests for that, fwiw, by using valgrind as a CPU emulator to find branching/indexing by secret data
03:54 < sipa> see ctime_tests.c
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08:02 < Ademan> sipa: thanks, yeah I wasn't expecting "constant" but more consistent than I've seen (+-500ns)/~23.5us which is really only like 2%. My benchmark runner *should* be warming up caches for me though, fwiw. I was tripping on the fact that other benchmarks had far smaller variance (on the order of 10s of ns) but they were also considerably shorter running overall, actually probably *larger* variance in 
08:03 < Ademan> percentage terms. (I'm going to blame this on being sick and jet lagged)
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--- Log closed Thu Apr 24 00:00:24 2025