---
name: "gnutls_certificate_set_x509_trust"
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_certificate_set_x509_trust"
---

# gnutls\_certificate\_set\_x509\_trust(3)

API function

## NAME

gnutls\_certificate\_set\_x509\_trust - API function

## SYNOPSIS

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

**int gnutls\_certificate\_set\_x509\_trust(gnutls\_certificate\_credentials\_t** *res***, gnutls\_x509\_crt\_t \*** *ca\_list***, int** *ca\_list\_size***);**

## ARGUMENTS

- gnutls\_certificate\_credentials\_t res

  is a **gnutls\_certificate\_credentials\_t** type.

- gnutls\_x509\_crt\_t \* ca\_list

  is a list of trusted CAs

- int ca\_list\_size

  holds the size of the CA list

## DESCRIPTION

This function adds the trusted CAs in order to verify client or server certificates. In case of a client this is not required to be called if the certificates are not verified using **gnutls\_certificate\_verify\_peers2()**. This function may be called multiple times.

In case of a server the CAs set here will be sent to the client if a certificate request is sent. This can be disabled using **gnutls\_certificate\_send\_x509\_rdn\_sequence()**.

## RETURNS

the number of certificates processed or a negative error code on error.

## SINCE

2\.4.0

## 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/