gnutls_x509_crt_get_extension_oid — API function


#include <gnutls/x509.h>
int gnutls_x509_crt_get_extension_oid( gnutls_x509_crt_t cert,
  int indx,
  void * oid,
  size_t * oid_size);


gnutls_x509_crt_t cert

should contain a gnutls_x509_crt_t structure

int indx

Specifies which extension OID to send. Use (0) to get the first one.

void * oid

a pointer to a structure to hold the OID (may be null)

size_t * oid_size

initially holds the size of oid


This function will return the requested extension OID in the certificate. The extension OID will be stored as a string in the provided buffer.

The oid returned will be null terminated, although oid_size will not account for the trailing null.


On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error code is returned. If you have reached the last extension available GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE will be returned.


Report bugs to <>.

General guidelines for reporting bugs:

GnuTLS home page:


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. As an alternative you may obtain the manual from:


Copyright © 2001-2013 Free Software Foundation, Inc..

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.