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45 2017-12-29T04:53:25 <DSidH> arubi: a quick question about ECC. Can I throw and error when point at infinity is encountered?
46 2017-12-29T04:53:47 <DSidH> are there any situations where computing point at infinity is legit in bitcoin?
47 2017-12-29T04:56:51 <eck> no
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49 2017-12-29T04:56:55 <eck> certain pk values are disallowed
50 2017-12-29T04:56:59 <eck> e.g. 0
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52 2017-12-29T05:02:31 <DSidH> eck what about verifying signatures? will we ever encounter it then?
53 2017-12-29T05:03:40 <eck> you can create a tx that sends coins to an invalid address, in which case the coins either become anyone-can-spend or no-one-can-spend depending on the exact situation
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55 2017-12-29T05:07:42 <eck> i believe though (someone correct me if i am wrong) that signature verification just requires add/multiply operations, so there are no pathological values from that pov
56 2017-12-29T05:09:59 <eck> and modulus, i guess
57 2017-12-29T05:10:07 <eck> https://en.wikipedia.org/wiki/Elliptic_Curve_Digital_Signature_Algorithm#Signature_verification_algorithm
58 2017-12-29T05:12:58 <rmt> FTR, https://bitcoin.stackexchange.com/questions/61907/uxto-db-structure answers my question above.
59 2017-12-29T05:14:36 <eck> here's where this could come up though, as you can see from the wikipedia article, in a normal ECDSA signature you do a sanity check of the public key, e.g. check that it is within the expected range
60 2017-12-29T05:15:03 <eck> most transactions in the bitcoin network are P2PKH, meaning that the tx script contains the hash of the public key rather than the full public key itself
61 2017-12-29T05:15:29 <eck> therefore other nodes can't properly validate the public key used, since they only know the hash, not the full public key
62 2017-12-29T05:15:51 <eck> so you could create an invalid public key, and then if you used it in a P2PKH transaction it would be "unspendable"
63 2017-12-29T05:16:57 <eck> more technically, from a mathematical pov there is likely some valid public key that has the same hash (as the hash is only 160 bits, vs 256 for the full key), but in practice it becomes unspendable since no one knows what that valid key is
64 2017-12-29T05:19:19 <DSidH> eck Invalid keys can be handled. I am more worried about legit keys because sig validation requires aX + bY for two good points X and Y
65 2017-12-29T05:19:57 <DSidH> if aA = -bY this could lead to point at infinity
66 2017-12-29T05:20:07 <DSidH> (aX = -bY)
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68 2017-12-29T05:21:13 <DSidH> and attacker could construct other values that cause this
69 2017-12-29T05:21:20 <eck> example?
70 2017-12-29T05:21:35 <DSidH> not sure, just a worry
71 2017-12-29T05:21:57 <eck> i don't think that would leat to a point at infinity
72 2017-12-29T05:22:06 <eck> that would lead to a point at zero which is not allowed anyway
73 2017-12-29T05:23:06 <DSidH> how does core handle this?
74 2017-12-29T05:23:42 <eck> i can't tell you off hand but my assumption is it would be unspendable for the reason i just gave
75 2017-12-29T05:24:14 <DSidH> yup thats cool as long as I am following the same rules
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77 2017-12-29T05:26:19 <DSidH> I wanted to keep (0, 0) as a special case for point at infinity as others have done but that feels hacky
78 2017-12-29T05:26:54 <DSidH> tacky*
79 2017-12-29T05:27:34 <eck> well the issue is if you used 0 as your private key, the multiplication privkey * G would trivially be zero also
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81 2017-12-29T05:27:50 <eck> which is why 0 is disallowed
82 2017-12-29T05:28:28 <eck> i don't know how this works with ancient p2pk txs though
83 2017-12-29T05:29:34 <DSidH> eck for instance in key recovery we need to test that nR is point at infinity; currently I am doing it via exception. This is the only case I have encountered it
84 2017-12-29T05:30:55 <DSidH> btw ignore the actual notation as I dont remember the formula but we need to test that aX is infinite for some a, X
85 2017-12-29T05:31:14 <eck> if you're using libsecp256k1 it should handle the edge cases for you, if you have your own implementation i would suggest trying to port the libsecp256k1 tests to your implementation
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87 2017-12-29T05:36:43 <DSidH> https://eprint.iacr.org/2015/1060.pdf Has anyone looked at this? (complete formula for ECC addition without exceptions)
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102 2017-12-29T06:40:56 <blyat_> Is there any documentation for the debug categories?
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116 2017-12-29T07:23:15 <arubi> DSidH, I'm actually not sure what's the safe and correct way to handle that. I'm returning "not a point" for both non points and the point at infinity, but it only means "error" depending on what the program is doing. for example in signature validation \ pubkey recovery, the r value is allowed to be an invalid x coordinate in some cases, like in the rec_r_big file I posted on gist. the sec1-v2 doc says when you should be failing and when
117 2017-12-29T07:23:15 <arubi> to try again with different values
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121 2017-12-29T07:57:38 <arubi> but yea since I can just feed you signatures where ( s = z/k ), there should be a safe way to handle that.. I'm failing with "Runtime error (func=invmod, adr=37): Divide by zero" which is not very nice :)
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124 2017-12-29T08:07:05 <xiedeacc> what's CCoinsViewDB::GetHeadBlocks for? I have google a lot, there exists little information
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126 2017-12-29T08:19:45 <xiedeacc> what's CCoinsViewDB::GetHeadBlocks for? I have google a lot, there exists little information
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154 2017-12-29T09:26:49 <DSidH> EXIT
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180 2017-12-29T11:20:04 <firemanxbr> inb
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217 2017-12-29T15:25:24 <camarads> hey guys. can anybody tell me when will the new bitcoin core be available ? i have been waiting for the change address to be segwit also
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230 2017-12-29T15:55:09 <molz> camarads, when it's ready
231 2017-12-29T15:55:30 <molz> i'm waiting for v0.16.0 too, that's the version that has native segwit in the wallet
232 2017-12-29T15:57:22 <camarads> it would be perfect for the rpc api to have that option
233 2017-12-29T15:57:41 <camarads> when i use sendtoaddress , the change address to be segwit
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282 2017-12-29T19:14:36 <qwertzlcoatl> yo my bitcoin core app keeps crashing when i try to load it? it verifies blocks than says "loading finished" but then it just crashes? anyone ?
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285 2017-12-29T19:21:00 <molz> qwertzlcoatl, which version and which OS?
286 2017-12-29T19:21:16 <qwertzlcoatl> hold up this time it worked
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332 2017-12-29T23:13:42 <G0pn1k> o/
333 2017-12-29T23:13:44 <G0pn1k> hi all
334 2017-12-29T23:15:42 <Randolf> Hello G0pn1k.
335 2017-12-29T23:18:46 <G0pn1k> i was wondering if someone could maybe point me in the right direction, i might be being an idiot but im trying to query core to see basically an address has ever recieved funds
336 2017-12-29T23:19:33 <G0pn1k> i figured i would have to do something like txindex=1 and build a db of public keys that have ever existed in a transaction maybe? but im not too sure
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338 2017-12-29T23:20:00 <echeveria> you don't need txindex for that, but you'll be doing something external.
339 2017-12-29T23:20:18 <G0pn1k> i want to avoid any apis and such, maybe i should have said
340 2017-12-29T23:20:25 <G0pn1k> unless i understand external wrong
341 2017-12-29T23:20:27 <echeveria> take a look at something like bitcoin-iterate.
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343 2017-12-29T23:22:15 <G0pn1k> ah ok, so itterate over each hash and look at the from and to?
344 2017-12-29T23:23:13 <echeveria> it's the name of a tool. there's no 'from' in bitcoin.
345 2017-12-29T23:24:04 <G0pn1k> sorry, still trying to get my head around a lot it
346 2017-12-29T23:25:02 <G0pn1k> i thought if i itterate each transaction that is output from that script i could look at the resultant address and build a db from them all
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