From: Nokan Emiro <uzleepito@...>
Date: 2012-10-28T18:46:36+09:00
Subject: Re: OpenSSL ECDSA public key from private

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>
>
> #mul method.
>
> It can be called in four ways:
>
>    point.mul(bn)  => point
>    point.mul(bn, bn) => point
>    point.mul([bn], [point]) => point
>    point.mul([bn], [point], bn) => point
>
> The EC_POINT_mul function is called if you pass one or two OpenSSL::BN
> objects to it.
>
> If I execute this script:
>
> require 'openssl'
> key=OpenSSL::PKey::EC.new('secp256k1')
> bn1=OpenSSL::BN::new('123')
> bn2=OpenSSL::BN::new('456')
> pubkey=OpenSSL::PKey::EC::Point.new(key.group).mul(bn1,bn2)
> p pubkey.to_bn.to_s
>
> I get a beautiful 155-digit number. Then, I have no idea about what
> all these big numbers should be...
>

I'm sure I made a mistake but for me this script does not work.  The
problem is that OpenSSL::PKey::EC::Point does not have a #mul
method in it.

1.9.3-p194 :001 > require 'openssl'
 => true
1.9.3-p194 :002 > key = OpenSSL::PKey::EC.new 'secp256k1'
 => #<OpenSSL::PKey::EC:0x00000001cbb960>
1.9.3-p194 :003 > OpenSSL::PKey::EC::Point.new(key.group).methods.grep /mul/
 => []
1.9.3-p194 :004 >

:(

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<div><div class=3D"gmail_quote"><blockquote class=3D"gmail_quote" style=3D"=
margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
#mul method.<br>
<br>
It can be called in four ways:<br>
<br>
=C2=A0 =C2=A0point.mul(bn) =C2=A0=3D&gt; point<br>
=C2=A0 =C2=A0point.mul(bn, bn) =3D&gt; point<br>
=C2=A0 =C2=A0point.mul([bn], [point]) =3D&gt; point<br>
=C2=A0 =C2=A0point.mul([bn], [point], bn) =3D&gt; point<br>
<br>
The EC_POINT_mul function is called if you pass one or two OpenSSL::BN<br>
objects to it.<br>
<br>
If I execute this script:<br>
<br>
require &#39;openssl&#39;<br>
key=3DOpenSSL::PKey::EC.new(&#39;secp256k1&#39;)<br>
bn1=3DOpenSSL::BN::new(&#39;123&#39;)<br>
bn2=3DOpenSSL::BN::new(&#39;456&#39;)<br>
pubkey=3DOpenSSL::PKey::EC::Point.new(key.group).mul(bn1,bn2)<br>
p pubkey.to_bn.to_s<br>
<br>
I get a beautiful 155-digit number. Then, I have no idea about what<br>
all these big numbers should be...<br></blockquote><div><br></div><div>I&#3=
9;m sure I made a mistake but for me this script does not work. =C2=A0The<d=
iv>problem is that=C2=A0OpenSSL::PKey::EC::Point does not have a #mul</div>=
<div>
method in it.</div><div><br></div><div><div>1.9.3-p194 :001 &gt; require &#=
39;openssl&#39;</div><div>=C2=A0=3D&gt; true=C2=A0</div><div>1.9.3-p194 :00=
2 &gt; key =3D OpenSSL::PKey::EC.new &#39;secp256k1&#39;</div><div>=C2=A0=
=3D&gt; #&lt;OpenSSL::PKey::EC:0x00000001cbb960&gt;=C2=A0</div>
<div>1.9.3-p194 :003 &gt; OpenSSL::PKey::EC::Point.new(key.group).methods.g=
rep /mul/</div><div>=C2=A0=3D&gt; []=C2=A0</div><div>1.9.3-p194 :004 &gt;=
=C2=A0</div></div></div><div><br></div><div>:(</div><div><br></div></div></=
div>

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