---
name: "gnutls_certificate_set_x509_key_file2"
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_key_file2"
---

# gnutls\_certificate\_set\_x509\_key\_file2(3)

API function

## NAME

gnutls\_certificate\_set\_x509\_key\_file2 - API function

## SYNOPSIS

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

**int gnutls\_certificate\_set\_x509\_key\_file2(gnutls\_certificate\_credentials\_t** *res***, const char \*** *certfile***, const char \*** *keyfile***, gnutls\_x509\_crt\_fmt\_t** *type***, const char \*** *pass***, unsigned int** *flags***);**

## ARGUMENTS

- gnutls\_certificate\_credentials\_t res

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

- const char \* certfile

  is a file that containing the certificate list (path) for the specified private key, in PKCS7 format, or a list of certificates

- const char \* keyfile

  is a file that contains the private key

- gnutls\_x509\_crt\_fmt\_t type

  is PEM or DER

- const char \* pass

  is the password of the key

- unsigned int flags

  an ORed sequence of gnutls\_pkcs\_encrypt\_flags\_t

## DESCRIPTION

This function sets a certificate/private key pair in the gnutls\_certificate\_credentials\_t type.  This function may be called more than once, in case multiple keys/certificates exist for the server.  For clients that need to send more than its own end entity certificate, e.g., also an intermediate CA cert, then the\
  *certfile* must contain the ordered certificate chain.

Note that the names in the certificate provided will be considered when selecting the appropriate certificate to use (in case of multiple certificate/key pairs).

This function can also accept URLs at  *keyfile* and  *certfile* . In that case it will use the private key and certificate indicated by the URLs. Note that the supported URLs are the ones indicated by **gnutls\_url\_is\_supported()**. Before GnuTLS 3.4.0 when a URL was specified, the  *pass* part was ignored and a PIN callback had to be registered, this is no longer the case in current releases.

In case the  *certfile* is provided as a PKCS **11** URL, then the certificate, and its present issuers in the token are imported (i.e., forming the required trust chain).

If that function fails to load the  *res* structure is at an undefined state, it must not be reused to load other keys or certificates.

Note that, this function by default returns zero on success and a negative value on error. Since 3.5.6, when the flag **GNUTLS\_CERTIFICATE\_API\_V2** is set using **gnutls\_certificate\_set\_flags()** it returns an index (greater or equal to zero). That index can be used to other functions to refer to the added key-pair.

## RETURNS

On success this functions returns zero, and otherwise a negative value on error (see above for modifying that behavior).

## 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/