Hi,
consider reading the openssl x509 tool's sources
for example, try openssl x509 -purpose <some.cert

The functionality can be coded to C using the X509 OpenSSL API
for example, load the certificate like this:
X509 *PEM_read_X509(FILE *fp, X509 **x, pem_password_cb *cb, void *u);
and then use functions like these:
X509_get_issuer_name
X509_set_serialNumber
...


On Thu, Jan 29, 2009 at 4:14 AM, Leo, Liangyou Wang (liangwan)
<liang...@cisco.com> wrote:
> Hi all,
>
> Do you know which API could parse pem file of certificate?
>
> Then we could get version/validate/serial number and etc.
>
>
>
> Thanks!
>
>
>
> Regards,
> Leo
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