disturbing.pic.twitter.com/c4ggQQgULG
Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.
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Does it have a --disable-asm or any way to suppress that idiocy at build time?
yes, “config no-asm”. I have run most of the pure C version in tis-interpreter.
also the C implementation of AES is crappy best-effort constant-time whereas the SSE2 impl. is real constant-time.
I'm skeptical of even considering asm constant-time; it won't be on many cpu emulators, for instance.
Applications that need constant-time need while(now-start<max) spin();
that either means you have massively reduced concurrency, or an attacker can get the same leak via throughput
then you can handle at most ncores concurrent clients per `max` timeslot. a nonstarter
Assuming max is chosen to be a tight bound on runtime of any code path, it makes little difference.
How you compute a tight value for max is of course a problem in itself.
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