NAME

       gnutls_x509_crt_get_extension_by_oid - API function

SYNOPSIS

       #include <gnutls/x509.h>

       int   gnutls_x509_crt_get_extension_by_oid(gnutls_x509_crt_t   cert,  const  char  *  oid,
       unsigned indx, void * buf, size_t * buf_size, unsigned int * critical);

ARGUMENTS

       gnutls_x509_crt_t cert
                   should contain a gnutls_x509_crt_t type

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

       unsigned indx
                   In case multiple same OIDs exist in the extensions, this  specifies  which  to
                   send. Use (0) to get the first one.

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

       size_t * buf_size
                   initially holds the size of  buf

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

DESCRIPTION

       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.

RETURNS

       On success, GNUTLS_E_SUCCESS (0) is returned, otherwise a negative error code is returned.
       If     the     certificate     does     not     contain     the     specified    extension
       GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE will be returned.

REPORTING BUGS

       Report bugs to <bugs@gnutls.org>.
       Home page: https://www.gnutls.org

COPYRIGHT

       Copyright © 2001- Free Software Foundation, Inc., and others.
       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.

SEE ALSO

       The   full   documentation  for  gnutls  is  maintained  as  a  Texinfo  manual.   If  the
       /usr/share/doc/gnutls/ directory does not contain the HTML form visit

       https://www.gnutls.org/manual/