---
name: "gnutls_x509_privkey_export"
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_x509_privkey_export"
---

# gnutls\_x509\_privkey\_export(3)

API function

## NAME

gnutls\_x509\_privkey\_export - API function

## SYNOPSIS

**#include \<gnutls/x509.h\>**

**int gnutls\_x509\_privkey\_export(gnutls\_x509\_privkey\_t** *key***, gnutls\_x509\_crt\_fmt\_t** *format***, void \*** *output\_data***, size\_t \*** *output\_data\_size***);**

## ARGUMENTS

- gnutls\_x509\_privkey\_t key

  Holds the key

- gnutls\_x509\_crt\_fmt\_t format

  the format of output params. One of PEM or DER.

- void \* output\_data

  will contain a private key PEM or DER encoded

- size\_t \* output\_data\_size

  holds the size of output\_data (and will be replaced by the actual size of parameters)

## DESCRIPTION

This function will export the private key to a PKCS**1** structure for RSA or RSA-PSS keys, and integer sequence for DSA keys. Other keys types will be exported in PKCS**8** form.

If the structure is PEM encoded, it will have a header of "BEGIN RSA PRIVATE KEY".

It is recommended to use **gnutls\_x509\_privkey\_export\_pkcs8()** instead of this function, when a consistent output format is required.

## RETURNS

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

## 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/