NAME

       gnutls_x509_crt_get_authority_key_id - API function

SYNOPSIS

       #include <gnutls/x509.h>

       int  gnutls_x509_crt_get_authority_key_id(gnutls_x509_crt_t  cert,  void  *  id,  size_t *
       id_size, unsigned int * critical);

ARGUMENTS

       gnutls_x509_crt_t cert
                   should contain a gnutls_x509_crt_t type

       void * id   The place where the identifier will be copied

       size_t * id_size
                   Holds the size of the id field.

       unsigned int * critical
                   will be non-zero if the extension is marked as critical (may be null)

DESCRIPTION

       This function will return the X.509v3 certificate authority's  key  identifier.   This  is
       obtained by the X.509 Authority Key identifier extension field (2.5.29.35). Note that this
       function   only   returns   the    keyIdentifier    field    of    the    extension    and
       GNUTLS_E_X509_UNSUPPORTED_EXTENSION,  if the extension contains the name and serial number
       of the certificate. In  that  case  gnutls_x509_crt_get_authority_key_gn_serial()  may  be
       used.

RETURNS

       On success, GNUTLS_E_SUCCESS (0) is returned, GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE if the
       extension is not present, otherwise a negative error value.

REPORTING BUGS

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

COPYRIGHT

       Copyright © 2001-2022 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

       http://www.gnutls.org/manual/