---
name: "gnutls_verify_stored_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_verify_stored_pubkey"
---

# gnutls\_verify\_stored\_pubkey(3)

API function

## NAME

gnutls\_verify\_stored\_pubkey - API function

## SYNOPSIS

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

**int gnutls\_verify\_stored\_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***, 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 raw (der) data of the certificate

- unsigned int flags

  should be 0.

## DESCRIPTION

This function will try to verify a raw public-key or a public-key provided via a raw (DER-encoded) certificate using a list of stored public keys. The  *service* field if non-NULL should be a port number.

The  *db\_name* variable if non-null specifies a custom backend for the retrieval of entries. If it is NULL then the default file backend will be used. In POSIX-like systems the file backend uses the $HOME/.gnutls/known\_hosts file.

Note that if the custom storage backend is provided the retrieval function should return **GNUTLS\_E\_CERTIFICATE\_KEY\_MISMATCH** if the host/service pair is found but key doesn't match, **GNUTLS\_E\_NO\_CERTIFICATE\_FOUND** if no such host/service with the given key is found, and 0 if it was found. The storage function should return 0 on success.

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

## RETURNS

If no associated public key is found then **GNUTLS\_E\_NO\_CERTIFICATE\_FOUND** will be returned. If a key is found but does not match **GNUTLS\_E\_CERTIFICATE\_KEY\_MISMATCH** is returned. On success, **GNUTLS\_E\_SUCCESS** (0) is returned, or a negative error value on other errors.

## 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/