I suspect that the smaller one is using Certicom's patented point compression representation of the public key.

Not sure on the signature part of your question.

Bill

-----Original Message-----
From: owner-openssl-users@openssl.org [mailtowner-openssl-users@openssl.org] On Behalf Of Bruno Vétel
Sent: October 9, 2008 4:35 PM
To: openssl-users@openssl.org
Subject: sect163k1 public keys

hello

It seems that sect163k1 public keys can have two formats

The first with a key lentgh of 43 bytes which seems to be the standard,
the second used by openssl with length 64 bytes.

Can anyone tell me where I can find informations on that and what it the
impact on signature.

I used a development snapshot (openssl-SNAP-20080930) of openssl

Thanks for your help

Bruno Vetel



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On Thu, 2008-10-09 at 14:51 -0600, Bill Colvin wrote:
> I suspect that the smaller one is using Certicom's patented point compression representation of the public key.

Hello Bill

Thanks for your answer but I
don't think so. Following this url,

http://tls.secg.org/index1.php?action=certificate

the uncompressed size is 43 bytes and the compressed
form 22

Bruno



>
> Not sure on the signature part of your question.
>
> Bill
>
> -----Original Message-----
> From: owner-openssl-users@openssl.org [mailtowner-openssl-users@openssl.org] On Behalf Of Bruno Vétel
> Sent: October 9, 2008 4:35 PM
> To: openssl-users@openssl.org
> Subject: sect163k1 public keys
>
> hello
>
> It seems that sect163k1 public keys can have two formats
>
> The first with a key lentgh of 43 bytes which seems to be the standard,
> the second used by openssl with length 64 bytes.
>
> Can anyone tell me where I can find informations on that and what it the
> impact on signature.
>
> I used a development snapshot (openssl-SNAP-20080930) of openssl
>
> Thanks for your help
>
> Bruno Vetel
>
>
>
> __________________________________________________ ____________________
> OpenSSL Project http://www.openssl.org
> User Support Mailing List openssl-users@openssl.org
> Automated List Manager majordomo@openssl.org
> __________________________________________________ ____________________
> OpenSSL Project http://www.openssl.org
> User Support Mailing List openssl-users@openssl.org
> Automated List Manager majordomo@openssl.org

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