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Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] BIP proposal - Signatures of Messages using
Bitcoin Private Keys
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Date: Mon, 18 Feb 2019 23:50:30 -0000
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Ah, OK, that's of course a good thing to document this undocumented (and
strange) stuff, as a matter of fact I implemented it after reading your
post (because this was on my todo list since some time) and got annoyed
quickly, mainly by what is doing formatMessageForSigning (which is quite
trivial when you know it but would be good to document precisely)
So, yes, it's a good idea to write this, regarding the header I still
don't see the use, testing the different possibilities is not a big
deal, why the signature format is not the same as transactions one is
mysterious too
Le 19/02/2019 à 00:24, Christopher Gilliard a écrit :
> The proposal includes actual code that does verification, but I didn't
> include code for signing. I thought it could be inferred, but I could
> at least include a description of how to sign. I am not sure exactly
> what part you are referring to by "keys speech", but the signatures
> are done by ECDSA keys so it's hard to not include anything about keys
> even though that's not the main topic. The "Background on ECDSA keys"
> section was mainly meant to give background about what kind of keys
> Bitcoin uses, for people who already know that they can easily skip
> this section so I would probably think it's best just to leave in.
> Maybe it should be at the end as an addendum though. Yes, I did not
> invent any of this, I'm just documenting what people actually seem to
> do because I had to verify signatures as part of a project I'm working
> on. I would have liked to have had this document when I started the
> project so I thought it might be useful to others since as far as I
> can tell this was not specified anywhere. The reason for including
> this data in the header is the same that compressed/uncompressed is
> included in the header so that you know which type of key the
> signature is from and you don't have to try all options to see if any
> matches. This is why Trezor did that way and why I documented it. I'm
> sure there are other ways to do this, but since this is out there in
> the field being used and is a reasonable solution, I thought I'd write
> it up.
>
> On Mon, Feb 18, 2019 at 2:59 PM Aymeric Vitte <vitteaymeric@gmail.com
> <mailto:vitteaymeric@gmail.com>> wrote:
>
> Then, since you wrote this proposal, maybe you should add the very
> precise description of the signing/verification process since it
> is documented nowhere
>
> I don't get the use of the speech regarding keys while it should
> focus on signatures which are summarized in a vague sentence
> inspired by your ref [2] with a not very logical link to the next
> paragraph stating that r,s should be 32B and the whole thing 65B
> with a header of 1B, you did not invent it, that's probably the
> rule, not sure where it is specified again and for what purpose,
> the header seems completely of no use especially when you extend
> to segwit/bech32 since you just have to check that related
> compressed key matches
>
> Le 17/02/2019 à 15:14, Christopher Gilliard via bitcoin-dev a écrit :
>> I have written up a proposed BIP. It has to do with Signature
>> formats when using Bitcoin Private keys. It is
>> here: https://github.com/cgilliard/BIP/blob/master/README.md
>>
>> This BIP was written up as suggested in this github
>> issue: https://github.com/bitcoin/bitcoin/issues/10542
>>
>> Note that the proposal is inline with the implementation that
>> Trezor implemented in the above issue.
>>
>> Any feedback would be appreciated. Please let me know what the
>> steps are with regards to getting a BIP number assigned or any
>> other process steps required.
>>
>> Regards,
>> Chris
>>
>> _______________________________________________
>> bitcoin-dev mailing list
>> bitcoin-dev@lists.linuxfoundation.org <mailto:bitcoin-dev@lists.linuxfoundation.org>
>> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>
> --
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<p>Ah, OK, that's of course a good thing to document this
undocumented (and strange) stuff, as a matter of fact I
implemented it after reading your post (because this was on my
todo list since some time) and got annoyed quickly, mainly by what
is doing formatMessageForSigning (which is quite trivial when you
know it but would be good to document precisely)</p>
<p>So, yes, it's a good idea to write this, regarding the header I
still don't see the use, testing the different possibilities is
not a big deal, why the signature format is not the same as
transactions one is mysterious too<br>
</p>
<div class="moz-cite-prefix">Le 19/02/2019 à 00:24, Christopher
Gilliard a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:CAK=nyAztSeEbDL=98PTdx-sdqGOug26-3vyADA-tc5oxECyZPw@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">The proposal includes actual code that does
verification, but I didn't include code for signing. I thought
it could be inferred, but I could at least include a description
of how to sign. I am not sure exactly what part you are
referring to by "keys speech", but the signatures are done by
ECDSA keys so it's hard to not include anything about keys even
though that's not the main topic. The "Background on ECDSA keys"
section was mainly meant to give background about what kind of
keys Bitcoin uses, for people who already know that they can
easily skip this section so I would probably think it's best
just to leave in. Maybe it should be at the end as an addendum
though. Yes, I did not invent any of this, I'm just documenting
what people actually seem to do because I had to verify
signatures as part of a project I'm working on. I would have
liked to have had this document when I started the project so I
thought it might be useful to others since as far as I can tell
this was not specified anywhere. The reason for including this
data in the header is the same that compressed/uncompressed is
included in the header so that you know which type of key the
signature is from and you don't have to try all options to see
if any matches. This is why Trezor did that way and why I
documented it. I'm sure there are other ways to do this, but
since this is out there in the field being used and is a
reasonable solution, I thought I'd write it up.</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Mon, Feb 18, 2019 at 2:59
PM Aymeric Vitte <<a href="mailto:vitteaymeric@gmail.com"
moz-do-not-send="true">vitteaymeric@gmail.com</a>> wrote:<br>
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<p>Then, since you wrote this proposal, maybe you should add
the very precise description of the signing/verification
process since it is documented nowhere</p>
<p>I don't get the use of the speech regarding keys while it
should focus on signatures which are summarized in a vague
sentence inspired by your ref [2] with a not very logical
link to the next paragraph stating that r,s should be 32B
and the whole thing 65B with a header of 1B, you did not
invent it, that's probably the rule, not sure where it is
specified again and for what purpose, the header seems
completely of no use especially when you extend to
segwit/bech32 since you just have to check that related
compressed key matches<br>
</p>
<div class="gmail-m_416822245153225270moz-cite-prefix">Le
17/02/2019 à 15:14, Christopher Gilliard via bitcoin-dev a
écrit :<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">I have written up a proposed BIP. It
has to do with Signature formats when using Bitcoin
Private keys. It is here: <a
href="https://github.com/cgilliard/BIP/blob/master/README.md"
target="_blank" moz-do-not-send="true">https://github.com/cgilliard/BIP/blob/master/README.md</a></div>
<div dir="ltr"><br>
</div>
<div>This BIP was written up as suggested in this
github issue: <a
href="https://github.com/bitcoin/bitcoin/issues/10542"
target="_blank" moz-do-not-send="true">https://github.com/bitcoin/bitcoin/issues/10542</a></div>
<div><br>
</div>
<div>Note that the proposal is inline with the
implementation that Trezor implemented in the above
issue.</div>
<div dir="ltr"><br>
</div>
<div>Any feedback would be appreciated. Please let me
know what the steps are with regards to getting a
BIP number assigned or any other process steps
required.</div>
<div><br>
</div>
<div>Regards,</div>
<div>Chris</div>
</div>
</div>
<br>
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<pre class="gmail-m_416822245153225270moz-signature" cols="72">--
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</div>
</blockquote>
</div>
</blockquote>
<pre class="moz-signature" cols="72">--
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Check the 10 M passwords list: <a class="moz-txt-link-freetext" href="http://peersm.com/findmyass">http://peersm.com/findmyass</a>
Anti-spies and private torrents, dynamic blocklist: <a class="moz-txt-link-freetext" href="http://torrent-live.org">http://torrent-live.org</a>
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GitHub : <a class="moz-txt-link-freetext" href="https://www.github.com/Ayms">https://www.github.com/Ayms</a></pre>
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