---
name: "gnutls_cipher_encrypt3"
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_cipher_encrypt3"
---

# gnutls\_cipher\_encrypt3(3)

API function

## NAME

gnutls\_cipher\_encrypt3 - API function

## SYNOPSIS

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

**int gnutls\_cipher\_encrypt3(gnutls\_cipher\_hd\_t** *handle***, const void \*** *ptext***, size\_t** *ptext\_len***, void \*** *ctext***, size\_t \*** *ctext\_len***, unsigned** *flags***);**

## ARGUMENTS

- gnutls\_cipher\_hd\_t handle

  is a **gnutls\_cipher\_hd\_t** type

- const void \* ptext

  the data to encrypt

- size\_t ptext\_len

  the length of data to encrypt

- void \* ctext

  the encrypted data

- size\_t \* ctext\_len

  the length of encrypted data (initially must hold the maximum available size)

- unsigned flags

  flags for padding

## DESCRIPTION

This function will encrypt the given data using the algorithm specified by the context. For block ciphers,  *ptext\_len* is typically a multiple of the block size. If not, the caller can instruct the function to pad the last block according to  *flags* . Currently, the only available padding scheme is **GNUTLS\_CIPHER\_PADDING\_PKCS7**.

If  *ctext* is not **NULL**, it must hold enough space to store resulting cipher text. To check the required size, this function can be called with  *ctext* set to **NULL**. Then  *ctext\_len* will be updated without performing actual encryption.

## RETURNS

Zero or a negative error code on error.

## SINCE

3\.7.7

## 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/