---
name: "gnutls_store_pubkey"
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_store_pubkey"
---

# gnutls\_store\_pubkey(3)

API function

## NAME

gnutls\_store\_pubkey - API function

## SYNOPSIS

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

**int gnutls\_store\_pubkey(const char \*** *db\_name***, gnutls\_tdb\_t** *tdb***, const char \*** *host***, const char \*** *service***, gnutls\_certificate\_type\_t** *cert\_type***, const gnutls\_datum\_t \*** *cert***, time\_t** *expiration***, unsigned int** *flags***);**

## ARGUMENTS

- const char \* db\_name

  A file specifying the stored keys (use NULL for the default)

- gnutls\_tdb\_t tdb

  A storage structure or NULL to use the default

- const char \* host

  The peer's name

- const char \* service

  non-NULL if this key is specific to a service (e.g. http)

- gnutls\_certificate\_type\_t cert\_type

  The type of the certificate

- const gnutls\_datum\_t \* cert

  The data of the certificate

- time\_t expiration

  The expiration time (use 0 to disable expiration)

- unsigned int flags

  should be 0.

## DESCRIPTION

This function will store a raw public-key or a public-key provided via a raw (DER-encoded) certificate to the list of stored public keys. The key will be considered valid until the provided expiration time.

The  *tdb* variable if non-null specifies a custom backend for the storage of entries. If it is NULL then the default file backend will be used.

Unless an alternative  *tdb* is provided, the storage format is a textual format consisting of a line for each host with fields separated by '\|'. The contents of the fields are a format-identifier which is set to 'g0', the hostname that the rest of the data applies to, the numeric port or host name, the expiration time in seconds since the epoch (0 for no expiration), and a base64 encoding of the raw (DER) public key information (SPKI) of the peer.

As of GnuTLS 3.6.6 this function also accepts raw public keys.

## RETURNS

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

## SINCE

3\.0.13

## 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/