---
name: "gnutls_pubkey_get_key_usage"
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_pubkey_get_key_usage"
---

# gnutls\_pubkey\_get\_key\_usage(3)

API function

## NAME

gnutls\_pubkey\_get\_key\_usage - API function

## SYNOPSIS

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

**int gnutls\_pubkey\_get\_key\_usage(gnutls\_pubkey\_t** *key***, unsigned int \*** *usage***);**

## ARGUMENTS

- gnutls\_pubkey\_t key

  should contain a **gnutls\_pubkey\_t** type

- unsigned int \* usage

  If set will return the number of bits of the parameters (may be NULL)

## DESCRIPTION

This function will return the key usage of the public key.

## RETURNS

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

## SINCE

2\.12.0

## 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/