gnutls\_certificate\_get\_issuer(3) gnutls gnutls\_certificate\_get\_issuer(3)

# [NAME](#NAME)

gnutls\_certificate\_get\_issuer - API function

# [SYNOPSIS](#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](#ARGUMENTS)

[gnutls\_certificate\_credentials\_t sc](#gnutls_certificate_credentials_t)

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

[gnutls\_x509\_crt\_t cert](#gnutls_x509_crt_t)

is the certificate to find issuer for

[gnutls\_x509\_crt\_t * issuer](#gnutls_x509_crt_t~2)

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

[unsigned int flags](#unsigned)

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

# [DESCRIPTION](#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](#RETURNS)

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

# [SINCE](#SINCE)

3.0

# [REPORTING BUGS](#REPORTING_BUGS)

Report bugs to <bugs@gnutls.org>.  
Home page: https://www.gnutls.org

# [COPYRIGHT](#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](#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/](https://www.gnutls.org/manual/)

3.8.13 gnutls

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Document: gnutls_certificate_get_issuer(3) from gnutls 3.8.13-r1 (Chainguard OS)
Source: https://gitlab.com/gnutls/gnutls