Thanks I found it already! Now everything works fine
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of jimmy
Sent: Dienstag, 20. März 2007 13:38
To: openssl-users@openssl.org
Subject: Re: Problem with ecdsa
[pls correct me if i'm wrong]
Jürgen Heiss wrote:
> Hi again,
>
> Yes, ecdsa_sig is defined like
>
> {
> int r;
> int s;
> }
>
> But the problem is that I don't know how to get my SignaturValue which is
> "724PlFGHTTL1cFlLFU6g6UetcPVBEAN6oNpogAUx3rgELFH86gA+NqvjVf316zek" into this
> struct.
>
> The function d2i_ECDSA_SIG which should fill this struct always return
> -1; ;o(
>
d2i is for the asn.1 conversion.
you see, as Nils, pointed out your blob is not in asn.1 der format (not
starting with 0x30..). since ecdsa_sig is BIGNUM *r, *s; you can try using the
BN_bin2bn() function to directly convert your blob to BIGNUM.
you'll need to do this twice, once for r & once for s. Since Nils told that the
2 numbers were concat'ed & since most of the time they're the same size, you
can take one half of the buffer to be r & the other half to be s.
Once you have BIGNUM's you can put them directly into your ECDSA_SIG.
-jb
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