---
name: "gnutls_certificate_get_issuer"
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_issuer"
---

# gnutls\_certificate\_get\_issuer(3)

API function

## NAME

gnutls\_certificate\_get\_issuer - API function

## SYNOPSIS

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

**int gnutls\_certificate\_get\_issuer(gnutls\_certificate\_credentials\_t** *sc***, gnutls\_x509\_crt\_t** *cert***, gnutls\_x509\_crt\_t \*** *issuer***, unsigned int** *flags***);**

## ARGUMENTS

- gnutls\_certificate\_credentials\_t sc

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

- gnutls\_x509\_crt\_t cert

  is the certificate to find issuer for

- gnutls\_x509\_crt\_t \* issuer

  Will hold the issuer if any. Should be treated as constant.

- unsigned int flags

  Use zero or **GNUTLS\_TL\_GET\_COPY**

## DESCRIPTION

This function will return the issuer of a given certificate. If the flag **GNUTLS\_TL\_GET\_COPY** is specified a copy of the issuer will be returned which must be freed using **gnutls\_x509\_crt\_deinit()**. In that case the provided  *issuer* must not be initialized.

As with **gnutls\_x509\_trust\_list\_get\_issuer()** this function requires the **GNUTLS\_TL\_GET\_COPY** flag in order to operate with PKCS**11** trust lists in a thread-safe way.

## RETURNS

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

## SINCE

3\.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/