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Date: Sun, 17 Jun 2012 17:16:13 +0200
Message-ID: <CA+s+GJAc8ZX9ziapULE7KJpJUonTv+sfncw0RGLwu_YPQrM=zw@mail.gmail.com>
From: Wladimir <laanwj@gmail.com>
To: Pieter Wuille <pieter.wuille@gmail.com>
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Cc: bitcoin-development@lists.sourceforge.net
Subject: Re: [Bitcoin-development] After compressed pubkeys: hybrid pubkeys
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On Sun, Jun 17, 2012 at 2:04 PM, Pieter Wuille <pieter.wuille@gmail.com>wrote:

> On Sun, Jun 17, 2012 at 01:01:12PM +0200, Mike Hearn wrote:
> > > * 0x04 [32-byte X coord] [32-byte Y coord]: uncompressed format
> > > * 0x06 [32-byte X coord] [32-byte Y coord]: hybrid format for even Y
> coords
> > > * 0x07 [32-byte X coord] [32-byte Y coord]: hybrid format for odd Y
> coords
> >
> > So what's the actual difference in format? Is there any at all, or
> > it's just the first number that's different?
>
> >From what I understand, that is indeed the only difference.
>
>
To prevent surprises in the future, in case OpenSSL decides to add more,
can we disable all other key formats in advance?

Wladimir

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<br><div class=3D"gmail_quote">On Sun, Jun 17, 2012 at 2:04 PM, Pieter Wuil=
le <span dir=3D"ltr">&lt;<a href=3D"mailto:pieter.wuille@gmail.com" target=
=3D"_blank">pieter.wuille@gmail.com</a>&gt;</span> wrote:<br><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;p=
adding-left:1ex">
<div class=3D"im">On Sun, Jun 17, 2012 at 01:01:12PM +0200, Mike Hearn wrot=
e:<br>
&gt; &gt; * 0x04 [32-byte X coord] [32-byte Y coord]: uncompressed format<b=
r>
&gt; &gt; * 0x06 [32-byte X coord] [32-byte Y coord]: hybrid format for eve=
n Y coords<br>
&gt; &gt; * 0x07 [32-byte X coord] [32-byte Y coord]: hybrid format for odd=
 Y coords<br>
&gt;<br>
&gt; So what&#39;s the actual difference in format? Is there any at all, or=
<br>
&gt; it&#39;s just the first number that&#39;s different?<br>
<br>
</div>&gt;From what I understand, that is indeed the only difference.<br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br></font></span></blockquo=
te><div><br>
To prevent surprises in the future, in case OpenSSL decides to add more, ca=
n we disable all other key formats in advance?<br><br>
Wladimir <br><br></div></div>

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