---
name: "gnutls_cipher_get_tag_size"
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_cipher_get_tag_size"
---

# gnutls\_cipher\_get\_tag\_size(3)

API function

## NAME

gnutls\_cipher\_get\_tag\_size - API function

## SYNOPSIS

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

**unsigned gnutls\_cipher\_get\_tag\_size(gnutls\_cipher\_algorithm\_t** *algorithm***);**

## ARGUMENTS

- gnutls\_cipher\_algorithm\_t algorithm

  is an encryption algorithm

## DESCRIPTION

This function returns the tag size of an authenticated encryption algorithm. For non-AEAD algorithms, it returns zero.

## RETURNS

the tag size of the authenticated encryption algorithm.

## SINCE

3\.2.2

## 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/