---
name: "gnutls_certificate_get_x509_crt"
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_get_x509_crt"
---

# gnutls\_certificate\_get\_x509\_crt(3)

API function

## NAME

gnutls\_certificate\_get\_x509\_crt - API function

## SYNOPSIS

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

**int gnutls\_certificate\_get\_x509\_crt(gnutls\_certificate\_credentials\_t** *res***, unsigned** *index***, gnutls\_x509\_crt\_t \*\*** *crt\_list***, unsigned \*** *crt\_list\_size***);**

## ARGUMENTS

- gnutls\_certificate\_credentials\_t res

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

- unsigned index

  The index of the certificate list to obtain.

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

  Where to store the certificate list.

- unsigned \* crt\_list\_size

  Will hold the number of certificates.

## DESCRIPTION

Obtains a X.509 certificate list that has been stored in  *res* with one of **gnutls\_certificate\_set\_x509\_key()**, **gnutls\_certificate\_set\_key()**, **gnutls\_certificate\_set\_x509\_key\_file()**, **gnutls\_certificate\_set\_x509\_key\_file2()**, **gnutls\_certificate\_set\_x509\_key\_mem()**, or **gnutls\_certificate\_set\_x509\_key\_mem2()**. Each certificate in the returned certificate list must be deallocated with **gnutls\_x509\_crt\_deinit()**, and the list itself must be freed with **gnutls\_free()**.

The  *index* matches the return value of **gnutls\_certificate\_set\_x509\_key()** and friends functions, when the **GNUTLS\_CERTIFICATE\_API\_V2** flag is set.

If there is no certificate with the given index, **GNUTLS\_E\_REQUESTED\_DATA\_NOT\_AVAILABLE** is returned. If the certificate with the given index is not a X.509 certificate, **GNUTLS\_E\_INVALID\_REQUEST** is returned. The returned certificates must be deinitialized after use, and the  *crt\_list* pointer must be freed using **gnutls\_free()**.

## RETURNS

**GNUTLS\_E\_SUCCESS** (0) on success, or a negative error code.

## SINCE

3\.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/