---
name: "gnutls_x509_trust_list_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_x509_trust_list_get_issuer"
---

# gnutls\_x509\_trust\_list\_get\_issuer(3)

API function

## NAME

gnutls\_x509\_trust\_list\_get\_issuer - API function

## SYNOPSIS

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

**int gnutls\_x509\_trust\_list\_get\_issuer(gnutls\_x509\_trust\_list\_t** *list***, gnutls\_x509\_crt\_t** *cert***, gnutls\_x509\_crt\_t \*** *issuer***, unsigned int** *flags***);**

## ARGUMENTS

- gnutls\_x509\_trust\_list\_t list

  The list

- 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 unless **GNUTLS\_TL\_GET\_COPY** is set in  *flags* .

- unsigned int flags

  flags from **gnutls\_trust\_list\_flags\_t** (**GNUTLS\_TL\_GET\_COPY** is applicable)

## DESCRIPTION

This function will find the issuer of the 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.

Note that the flag **GNUTLS\_TL\_GET\_COPY** is required for this function to work 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/