--- Log opened Fri Jul 14 00:00:58 2023
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08:33 < stevenroose> The secp256k1 Scalar API errors if a random 32-byte value is inputted that is "above the curve order". Is that like a "probabilistically negligible event"? Or is one actually expected to handle that in some way?
08:51 < jeremyrubin> You should handle it and how you handle it is relevant IIRC
08:51 < jeremyrubin> you need to rejection sample 
08:53 < jeremyrubin> 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141/ 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
08:58 < jeremyrubin> if i did my math right it seems like it's just about 128 bits of security, so probably OK. But I think rejection sampling is still the right move 
08:59 < andytoshi> stevenroose: it's probablistically negligible
08:59 < andytoshi> a 2^-128 event will literally never happen in any of our lives
08:59 < andytoshi> or anybody's life
08:59 < andytoshi> though rejection sampling is probably the least-code way to handle it
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09:48 < jeremyrubin> andytoshi: I was thinking more along the lines of faulty rng modes, but given that you probably want to quit the application anyways
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10:02 < stevenroose> thanks for the responses guys! jeremyrubin, andytoshi what is rejection sampling?
10:08 < stevenroose> It seems that rejection sampling means to just pick a new random value if it fails? But in the context of tweaking, it's almost never random right? It's usually some commitment that you can't re-sample..
10:08 < stevenroose> Or am I understanding rejection sampling incorrectly?
10:28 < stevenroose> "least-code way to handle it" I suppose would be just unwrapping the Result and panicking on error
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11:09 < BlueMatt[m]> yea, imo you should panic/abort if you get something with probability 1/2^128 - that pretty strongly indicates your rng is busted and you should give up all hope of doing any bitcoin anything.
11:32 < andytoshi> ah, that's a good point
11:33 < andytoshi> also a good point stevenroose that you can't "rejection sample" if you have a particular key tweaked with a particular thing
11:34 < andytoshi> so probably panicking (or just process-aborting if you worry that panicking is too much basically-dead code)
11:34  * BlueMatt[m] thinks all rust code should be panic = abort :p
11:35 < BlueMatt[m]> just like you shouldn't use exceptions in C++
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11:42 < stevenroose> (.unwrap() with panic = "abort" in manifest?) but ok, I got it, makes sense
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11:48 < BlueMatt[m]> yea, the fact that `panic = abort` isn't the default in rust was really a mistake
11:48 < BlueMatt[m]> again for the same reason that you shouldnt use exceptions in C++ - its ultimately the same mechanism/compiles the same.
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12:36 < kenshir0> hi! I would like to ask if there are plans to add Payjoin to Bitcoin Core
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--- Log closed Sat Jul 15 00:00:59 2023