---
name: "gnutls_x509_crl_get_authority_key_id"
section: "3"
platform: "linux"
package: "gnutls"
version: "3.8.13-3"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/gnutls_x509_crl_get_authority_key_id"
---

# gnutls\_x509\_crl\_get\_authority\_key\_id(3)

API function

## NAME

gnutls\_x509\_crl\_get\_authority\_key\_id - API function

## SYNOPSIS

**#include \<gnutls/x509.h\>**

**int gnutls\_x509\_crl\_get\_authority\_key\_id(gnutls\_x509\_crl\_t** *crl***, void \*** *id***, size\_t \*** *id\_size***, unsigned int \*** *critical***);**

## ARGUMENTS

- gnutls\_x509\_crl\_t crl

  should contain a **gnutls\_x509\_crl\_t** type

- void \* id

  The place where the identifier will be copied

- size\_t \* id\_size

  Holds the size of the result field.

- unsigned int \* critical

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

## DESCRIPTION

This function will return the CRL 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\_crl\_get\_authority\_key\_gn\_serial()** may be used.

## RETURNS

On success, **GNUTLS\_E\_SUCCESS** (0) is returned, otherwise a negative error code in case of an error.

## SINCE

2\.8.0

## REPORTING BUGS

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

## COPYRIGHT

Copyright © 2001-2023 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/