Oscar wrote:
>
> Does anybody knows what does idx means here:
>
> PKCS7_ISSUER_AND_SERIAL *
> PKCS7_get_issuer_and_serial(PKCS7 *p7, int idx)
>
> I have to use it but i don't do it ok because I don't understand.
> Thank's
>
It seems to only work for signed and enveloped data. There isn't a
function which returns just this structure so you'll need to look into
the internals of structures.
E.g.
STACK_OF(PKCS7_SIGNER_INFO) *infos;
infos = PKCS7_get_signer_info(p7);
We now have sk_PKCS7_SIGNER_INFO(infos) signer info structures (usually
there will be at most one). You can access each with:
PKCS7_SIGNER_INFO *sinfo = sk_PKCS7_SIGNER_INFO_value(infos, idx);
where idx runs from zero to sk_PKCS7_SIGNER_INFO(infos) - 1.
The PKCS7_ISSUER_AND_SERIAL structure is then at
sinfo->issuer_and_serial.
This isn't very portable because later if we want to handle the S/MIME
v3 structures there may not even be an issuer and serial number
structure present.
Steve.
--
Dr Stephen N. Henson. http://www.drh-consultancy.demon.co.uk/
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