---
name: "gnutls_x509_crt_set_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_crt_set_authority_key_id"
---

# gnutls\_x509\_crt\_set\_authority\_key\_id(3)

API function

## NAME

gnutls\_x509\_crt\_set\_authority\_key\_id - API function

## SYNOPSIS

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

**int gnutls\_x509\_crt\_set\_authority\_key\_id(gnutls\_x509\_crt\_t** *cert***, const void \*** *id***, size\_t** *id\_size***);**

## ARGUMENTS

- gnutls\_x509\_crt\_t cert

  a certificate of type **gnutls\_x509\_crt\_t**

- const void \* id

  The key ID

- size\_t id\_size

  Holds the size of the key ID field.

## DESCRIPTION

This function will set the X.509 certificate's authority key ID extension. Only the keyIdentifier field can be set with this function.

## RETURNS

On success, **GNUTLS\_E\_SUCCESS** (0) is returned, otherwise a negative error value.

## 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/