--- Day changed Mon Nov 16 2015
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11:41 < gmaxwell> Hey, we're on reddit: https://www.reddit.com/r/Bitcoin/comments/3t0kff/core_switched_to_libsecp256k1_for_verification/
11:43 < gmaxwell> andytoshi: feel like responding to any of these? https://www.reddit.com/r/Bitcoin/comments/3t0kff/core_switched_to_libsecp256k1_for_verification/cx2bhw0  In Bitcoin Core we do not enable endomorphism, the speedup is over 7x with the fastest libsecp256k1 options.. but we use the library in a more conservative way in Bitcoin Core.
11:46 < gmaxwell> waxwing: if you want to add a citation to your "found a bug" post, it's CVE-2014-3570 / https://www.openssl.org/news/secadv/20150108.txt
11:46 < waxwing> gmaxwell: ah thanks, yeah why not
11:46 < gmaxwell> waxwing: technically he found more than one, but the DER parser misbehavior in openssl was made inaccessible by other changes before we reported it.
11:47 < sipa> gmaxwell: the actual speedup factor i measured was 5.2x, but that's with gmp and endomorphism disabled
11:47 < gmaxwell> (we were intentionally refraining from reporting it until BIP66 was deployed; becuase we were concerned that the months that it would take us to deploy a fix would not fit into their timeframe.)
11:47 < gmaxwell> sipa: I know, thats what I was saying: "7x with the fastest libsecp256k1 options" :)
11:49 < Apocalyptic> gmaxwell, why is the endomorphism optimization not enabled in Core ?
11:50 < gmaxwell> Apocalyptic: because there is more code involved, and it's off by default in the library because it potentially has patent complications.
11:52 < Apocalyptic> I see, thanks, I guess the "more code involved" is also the reason why gmp is off ?
11:53 < sipa> andd because more dependencies are annoying
11:54 < sipa> though all libsecp256k1 uses gmp for anymore (=modular inverses) is tested by the internal code before use (and will case a panic if there is a mismatch)
11:54 < sipa> so it should be very safe to enable, assuming we trust either gmp or the internal multiplication code :)
11:55 < gmaxwell> Yea, before that I would also say "lots more code and GMP is not maintained with consensus criticality in mind, though it is well tested and reliable"-- but with the check, it's mostly the dependency issue.
11:56 < gmaxwell> andytoshi has been working on an internal modular inverse with an algorithim Dettman introduced us to which I expect will end up being considerably faster than GMP.
11:58 < Apocalyptic> sounds interesting
11:59 < andytoshi> gmaxwell: sure, i'll respond to some of the reddit silliness
12:07 < andytoshi> gmaxwell: what is the status of bip 66?
12:09 < sipa> andytoshi: deployed, active, forked in, ...?
12:09 < andytoshi> oh, excellent, just making sure
12:10 < sipa> andytoshi: it caused a short fork even, due to non-validating miners working on a block created by one of their trusted peers which produced a v2 block
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13:44 < sipa> commented here and there
13:44 < gmaxwell> Thanks!
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