From: Nokan Emiro <uzleepito@...>
Date: 2012-10-28T04:23:52+09:00
Subject: Re: OpenSSL ECDSA public key from private

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Thanks Carlo, but it's not what I was looking for.  I know about
#generate_key.
It creates a random private key and calculates the corresponding public key
too.  But I already have a (non-random) private key.  (I mean it is an input
for my script.)

Now what I need is to set my own private key, and calculate the public key
that matches my already existing private key.  I have a private key which is
not a random number.  Well, maybe it was some time ago in another software,
but for now, I can read it from a file, and I have no problem setting that
data as a private key.  The problem is that I need the public key that
matches the private one.

So what I need is to ask the 'key' object to be so kind and calculate the
the
public key for me using my private key I've just set with #private_key=.

key.private_key =   *<a paramether from outside>*
*
*
key.plese_calculate_the_public_key_from_the_private_one!


u.



On Sat, Oct 27, 2012 at 8:37 PM, Carlo E. Prelz <fluido@fluido.as> wrote:

>         Subject: OpenSSL ECDSA public key from private
>         Date: Sun 28 Oct 12 03:28:36AM +0900
>
> Quoting Nokan Emiro (uzleepito@gmail.com):
>
> > Setting the private_key works fine, but I need to calculate the
> public_key
> > too.
> > I'm sure there's a way to ask the key object to calculate the
> corresponding
> > public key, I just don't know how.
>
> I have never done this myself before , but I was curious, and gave it
> a look.
>
> Your OpenSSL::PKey::EC instance has a method called
> #generate_key. After I run
>
> key.generate_key
>
> I find that key.private_key is populated with an instance of
> OpenSSL::BN, and key.public_key is populated with an instance of
> OpenSSL::PKey::EC::Point.
>
> I hope this is what you were looking for.
>
> Carlo
>
> --
>   *         Se la Strada e la sua Virtu' non fossero state messe da parte,
> * K * Carlo E. Prelz - fluido@fluido.as             che bisogno ci sarebbe
>   *               di parlare tanto di amore e di rettitudine? (Chuang-Tzu)
>
>

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Thanks Carlo, but it&#39;s not what I was looking for. =C2=A0I know about #=
generate_key.<div>It creates a random private key and calculates the corres=
ponding public key</div><div>too. =C2=A0But I already have a (non-random) p=
rivate key. =C2=A0(I mean it is an input</div>
<div>for my script.)</div><div><br></div><div>Now what I need is to set my =
own private key, and calculate the public key</div><div>that matches my alr=
eady existing private key. =C2=A0I have a private key which is</div><div>no=
t a random=C2=A0number. =C2=A0Well, maybe it was some time ago in another s=
oftware,</div>
<div>but for now, I can read it from a file, and I have no problem setting =
that</div><div>data as a private key. =C2=A0The problem is that I need the =
public key that</div><div>matches the private one.</div><div><br></div><div=
>
So what I need is to ask the &#39;key&#39; object to be so kind and calcula=
te the the</div><div>public key for me using my private key I&#39;ve just s=
et with #private_key=3D.</div><div><br></div><blockquote class=3D"webkit-in=
dent-blockquote" style=3D"margin:0 0 0 40px;border:none;padding:0px">
<div><font class=3D"Apple-style-span" size=3D"1" face=3D"&#39;courier new&#=
39;, monospace">key.private_key =3D =C2=A0 <i><u>&lt;a paramether from outs=
ide&gt;</u></i></font></div><div><font class=3D"Apple-style-span" size=3D"1=
" face=3D"&#39;courier new&#39;, monospace"><i><u><br>
</u></i></font></div><div><font class=3D"Apple-style-span" size=3D"1" face=
=3D"&#39;courier new&#39;, monospace">key.plese_calculate_the_public_key_fr=
om_the_private_one!</font></div></blockquote><div><br></div><div>u.</div><d=
iv>
<br></div><div><br><br><div class=3D"gmail_quote">On Sat, Oct 27, 2012 at 8=
:37 PM, Carlo E. Prelz <span dir=3D"ltr">&lt;<a href=3D"mailto:fluido@fluid=
o.as" target=3D"_blank">fluido@fluido.as</a>&gt;</span> wrote:<br><blockquo=
te class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc so=
lid;padding-left:1ex">
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Subject: OpenSSL ECDSA public key from private<=
br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Date: Sun 28 Oct 12 03:28:36AM +0900<br>
<div class=3D"im"><br>
Quoting Nokan Emiro (<a href=3D"mailto:uzleepito@gmail.com">uzleepito@gmail=
.com</a>):<br>
<br>
&gt; Setting the private_key works fine, but I need to calculate the public=
_key<br>
&gt; too.<br>
&gt; I&#39;m sure there&#39;s a way to ask the key object to calculate the =
corresponding<br>
&gt; public key, I just don&#39;t know how.<br>
<br>
</div>I have never done this myself before , but I was curious, and gave it=
<br>
a look.<br>
<br>
Your OpenSSL::PKey::EC instance has a method called<br>
#generate_key. After I run<br>
<br>
key.generate_key<br>
<br>
I find that key.private_key is populated with an instance of<br>
OpenSSL::BN, and key.public_key is populated with an instance of<br>
OpenSSL::PKey::EC::Point.<br>
<br>
I hope this is what you were looking for.<br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br>
Carlo<br>
<br>
--<br>
=C2=A0 * =C2=A0 =C2=A0 =C2=A0 =C2=A0 Se la Strada e la sua Virtu&#39; non f=
ossero state messe da parte,<br>
* K * Carlo E. Prelz - <a href=3D"mailto:fluido@fluido.as">fluido@fluido.as=
</a> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 che bisogno ci sarebbe<br>
=C2=A0 * =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 di parlare tanto =
di amore e di rettitudine? (Chuang-Tzu)<br>
<br>
</font></span></blockquote></div><br></div>

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