---
name: "gnutls_privkey_sign_data"
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_privkey_sign_data"
---

# gnutls\_privkey\_sign\_data(3)

API function

## NAME

gnutls\_privkey\_sign\_data - API function

## SYNOPSIS

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

**int gnutls\_privkey\_sign\_data(gnutls\_privkey\_t** *signer***, gnutls\_digest\_algorithm\_t** *hash***, unsigned int** *flags***, const gnutls\_datum\_t \*** *data***, gnutls\_datum\_t \*** *signature***);**

## ARGUMENTS

- gnutls\_privkey\_t signer

  Holds the key

- gnutls\_digest\_algorithm\_t hash

  should be a digest algorithm

- unsigned int flags

  Zero or one of **gnutls\_privkey\_flags\_t**

- const gnutls\_datum\_t \* data

  holds the data to be signed

- gnutls\_datum\_t \* signature

  will contain the signature allocated with **gnutls\_malloc()**

## DESCRIPTION

This function will sign the given data using a signature algorithm supported by the private key. Signature algorithms are always used together with a hash functions.  Different hash functions may be used for the RSA algorithm, but only the SHA family for the DSA keys.

You may use **gnutls\_pubkey\_get\_preferred\_hash\_algorithm()** to determine the hash algorithm.

## RETURNS

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

## SINCE

2\.12.0

## 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/