---
name: "gnutls_x509_crt_get_issuer_dn"
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_crt_get_issuer_dn"
---

# gnutls\_x509\_crt\_get\_issuer\_dn(3)

API function

## NAME

gnutls\_x509\_crt\_get\_issuer\_dn - API function

## SYNOPSIS

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

**int gnutls\_x509\_crt\_get\_issuer\_dn(gnutls\_x509\_crt\_t** *cert***, char \*** *buf***, size\_t \*** *buf\_size***);**

## ARGUMENTS

- gnutls\_x509\_crt\_t cert

  should contain a **gnutls\_x509\_crt\_t** type

- char \* buf

  a pointer to a structure to hold the name (may be null)

- size\_t \* buf\_size

  initially holds the size of  *buf*

## DESCRIPTION

This function will copy the name of the Certificate issuer in the provided buffer. The name will be in the form "C=xxxx,O=yyyy,CN=zzzz" as described in RFC4514. The output string will be ASCII or UTF-8 encoded, depending on the certificate data.

If  *buf* is null then only the size will be filled.

This function does not output a fully RFC4514 compliant string, if that is required see **gnutls\_x509\_crt\_get\_issuer\_dn3()**.

## RETURNS

**GNUTLS\_E\_SHORT\_MEMORY\_BUFFER** if the provided buffer is not long enough, and in that case the  *buf\_size* will be updated with the required size. **GNUTLS\_E\_REQUESTED\_DATA\_NOT\_AVAILABLE** if the DN does not exist, or another error value on error. On success 0 is returned.

## 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/