RE: sect163k1 public keys

[Bruno Vétel]

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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] 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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sect163k1 public keys

[Bruno Vétel]

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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using signature with elliptic curve

[Bruno Vétel]

Hello

I would like to sign the digest of a file using the elliptic curve
sect233r1

I generate my by 
openssl ecparam -genkey -name sect233r1 -noout -out id_eckey

Signing by
openssl dgst -sha1 -sign id_eckey  file => OK  => OK
openssl dgst -sha512 -sign id_eckey  file => NOK

When I try to generate de digest before
It works with an rsa key but not with ecdsa key

openssl dgst -sha1 -out dg1 Makefile
openssl pkeyutl -sign -inkey id_rsa -in dg1 => OK
openssl pkeyutl -sign -inkey id_eckey -in dg1 => NOK


Could you tell me where I'm wrong.


Thanks

Regards

Bruno



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