.\" DO NOT MODIFY THIS FILE!  It was generated by gdoc.
.TH "gnutls_x509_crt_get_authority_key_id" 3 "3.8.4" "gnutls" "gnutls"
.SH NAME
gnutls_x509_crt_get_authority_key_id \- API function
.SH SYNOPSIS
.B #include <gnutls/x509.h>
.sp
.BI "int gnutls_x509_crt_get_authority_key_id(gnutls_x509_crt_t " cert ", void * " id ", size_t * " id_size ", unsigned int * " critical ");"
.SH ARGUMENTS
.IP "gnutls_x509_crt_t cert" 12
should contain a \fBgnutls_x509_crt_t\fP type
.IP "void * id" 12
The place where the identifier will be copied
.IP "size_t * id_size" 12
Holds the size of the id field.
.IP "unsigned int * critical" 12
will be non\-zero if the extension is marked as critical (may be null)
.SH "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
\fBGNUTLS_E_X509_UNSUPPORTED_EXTENSION\fP, if the extension contains
the name and serial number of the certificate. In that case
\fBgnutls_x509_crt_get_authority_key_gn_serial()\fP may be used.
.SH "RETURNS"
On success, \fBGNUTLS_E_SUCCESS\fP (0) is returned, \fBGNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE\fP
if the extension is not present, otherwise a negative error value.
.SH "REPORTING BUGS"
Report bugs to <bugs@gnutls.org>.
.br
Home page: https://www.gnutls.org

.SH COPYRIGHT
Copyright \(co 2001-2023 Free Software Foundation, Inc., and others.
.br
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.
.SH "SEE ALSO"
The full documentation for
.B gnutls
is maintained as a Texinfo manual.
If the /usr/share/doc/gnutls/
directory does not contain the HTML form visit
.B
.IP https://www.gnutls.org/manual/
.PP