---
name: "gnutls_x509_crq_get_extension_data"
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_crq_get_extension_data"
---

# gnutls\_x509\_crq\_get\_extension\_data(3)

API function

## NAME

gnutls\_x509\_crq\_get\_extension\_data - API function

## SYNOPSIS

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

**int gnutls\_x509\_crq\_get\_extension\_data(gnutls\_x509\_crq\_t** *crq***, unsigned** *indx***, void \*** *data***, size\_t \*** *sizeof\_data***);**

## ARGUMENTS

- gnutls\_x509\_crq\_t crq

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

- unsigned indx

  Specifies which extension number to get. Use (0) to get the first one.

- void \* data

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

- size\_t \* sizeof\_data

  initially holds the size of  *oid*

## DESCRIPTION

This function will return the requested extension data in the certificate.  The extension data will be stored as a string in the provided buffer.

Use **gnutls\_x509\_crq\_get\_extension\_info()** to extract the OID and critical flag.  Use **gnutls\_x509\_crq\_get\_extension\_by\_oid()** instead, if you want to get data indexed by the extension OID rather than sequence.

## RETURNS

On success, **GNUTLS\_E\_SUCCESS** (0) is returned, otherwise a negative error code in case of an error.  If your have reached the last extension available **GNUTLS\_E\_REQUESTED\_DATA\_NOT\_AVAILABLE** will be returned.

## SINCE

2\.8.0

## 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/