--- Log opened Wed Apr 17 00:00:47 2019
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11:30 < elichai2> Why does DER signafies if the highest bit is set or not in the first byte of `r` and `s`?
11:33 < gmaxwell> because it can encode negative numbers.
11:33 < gmaxwell> or rather, it's always coding a signed value.
11:34 < elichai2> gmaxwell: oh because DER is used even in non finite fields?
11:36 < andytoshi> der has no notion of fields afaik
11:36 < andytoshi> it basically just encodes bigints
11:44 < elichai2> ha. ok, it's not too fun. While testing my lib against rust-secp256k1 sometimes one fails to decode the others signature and i'm trying to debug and the official stuff on this aren't very clear so trying to learn from all the impelmentations out there haha
11:44 < elichai2> but thanks!
11:46 < gmaxwell> you probably shouldn't be implementing your own DER it's a more complicated format than you realize
11:46 < gmaxwell> and a lot of vulnerable software has been created from people doing that.
11:49 < elichai2> gmaxwell: it's for learning purposes, I'm implementing a full secp256k1 library in rust. but it's not for production and shouldn't be used
11:50 < elichai2> I'm just testing it against `rust-secp256k1` to see that it works correctly, then I want to try and implement schnorr into it(after seeing all of sipa and andytoshi talks on their plans on how it should be done nicely) :)
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--- Log closed Thu Apr 18 00:00:48 2019