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       gnutls_x509_crt_get_extension_by_oid   -   This  function  returns  the
       specified extension


       #include <gnutls/x509.h>

       int gnutls_x509_crt_get_extension_by_oid(gnutls_x509_crt_t cert,  const
       char  *  oid, int indx, void * buf, size_t * sizeof_buf, unsigned int *


       gnutls_x509_crt_t cert
                   should contain a gnutls_x509_crt_t structure

       const char * oid
                   holds an Object Identified in null terminated string

       int indx    In case multiple same OIDs exist in  the  extensions,  this
                   specifies which to send. Use zero to get the first one.

       void * buf  a pointer to a structure to hold the name (may be null)

       size_t * sizeof_buf
                   initially holds the size of buf

       unsigned int * critical
                   will be non zero if the extension is marked as critical


       This  function  will  return  the extension specified by the OID in the
       certificate.  The extensions  will  be  returned  as  binary  data  DER
       encoded, in the provided buffer.


       On  success,  GNUTLS_E_SUCCESS  (zero)  is returned, otherwise an error
       code is returned. If the certificate does  not  contain  the  specified
       extension GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE will be 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.gnutls_x509_crt_get_extension_by_oid(3)