---
name: "gnutls_x509_crl_get_authority_key_gn_serial"
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_gn_serial"
---

# gnutls\_x509\_crl\_get\_authority\_key\_gn\_serial(3)

API function

## NAME

gnutls\_x509\_crl\_get\_authority\_key\_gn\_serial - API function

## SYNOPSIS

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

**int gnutls\_x509\_crl\_get\_authority\_key\_gn\_serial(gnutls\_x509\_crl\_t** *crl***, unsigned int** *seq***, void \*** *alt***, size\_t \*** *alt\_size***, unsigned int \*** *alt\_type***, void \*** *serial***, size\_t \*** *serial\_size***, unsigned int \*** *critical***);**

## ARGUMENTS

- gnutls\_x509\_crl\_t crl

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

- unsigned int seq

  specifies the sequence number of the alt name (0 for the first one, 1 for the second etc.)

- void \* alt

  is the place where the alternative name will be copied to

- size\_t \* alt\_size

  holds the size of alt.

- unsigned int \* alt\_type

  holds the type of the alternative name (one of gnutls\_x509\_subject\_alt\_name\_t).

- void \* serial

  buffer to store the serial number (may be null)

- size\_t \* serial\_size

  Holds the size of the serial field (may be null)

- unsigned int \* critical

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

## DESCRIPTION

This function will return the X.509 authority key identifier when stored as a general name (authorityCertIssuer)  and serial number.

Because more than one general names might be stored\
  *seq* can be used as a counter to request them all until  **GNUTLS\_E\_REQUESTED\_DATA\_NOT\_AVAILABLE** is returned.

## RETURNS

Returns 0 on success, or an error code.

## SINCE

3\.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/