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       gnutls_x509_crt_get_key_purpose_oid   -   This   function  returns  the
       Certificate’s key purpose OIDs


       #include <gnutls/x509.h>

       int  gnutls_x509_crt_get_key_purpose_oid(gnutls_x509_crt_t  cert,   int
       indx, void * oid, size_t * sizeof_oid, unsigned int * critical);


       gnutls_x509_crt_t cert
                   should contain a gnutls_x509_crt_t structure

       int indx    This  specifies  which  OID  to return. Use zero to get the
                   first one.

       void * oid  a pointer to a buffer to hold the OID (may be null)

       size_t * sizeof_oid
                   initially holds the size of oid

       unsigned int * critical
                   output flag to indicate criticality of extension


       This function will extract the key  purpose  OIDs  of  the  Certificate
       specified  by  the  given  index.  These are stored in the Extended Key
       Usage extension ( See the GNUTLS_KP_* definitions  for  human
       readable names.

       If oid is null then only the size will be filled.


       GNUTLS_E_SHORT_MEMORY_BUFFER if the provided buffer is not long enough,
       and in that case the *sizeof_oid will  be  updated  with  the  required
       size.  On success 0 is returned.


       Report    bugs    to    <>.     GnuTLS   home   page: General help  using  GNU  software:


       Copyright © 2008 Free Software Foundation.
       Copying  and  distribution  of this file, with or without modification,
       are permitted in any medium  without  royalty  provided  the  copyright
       notice and this notice are preserved.


       The  full  documentation  for gnutls is maintained as a Texinfo manual.
       If the info and gnutls programs are properly installed  at  your  site,
       the command

              info gnutls

       should give you access to the complete manual.

gnutls                               2.8gnutls_x509_crt_get_key_purpose_oid(3)