---
name: "gnutls_ocsp_resp_get_extension"
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_ocsp_resp_get_extension"
---

# gnutls\_ocsp\_resp\_get\_extension(3)

API function

## NAME

gnutls\_ocsp\_resp\_get\_extension - API function

## SYNOPSIS

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

**int gnutls\_ocsp\_resp\_get\_extension(gnutls\_ocsp\_resp\_const\_t** *resp***, unsigned** *indx***, gnutls\_datum\_t \*** *oid***, unsigned int \*** *critical***, gnutls\_datum\_t \*** *data***);**

## ARGUMENTS

- gnutls\_ocsp\_resp\_const\_t resp

  should contain a **gnutls\_ocsp\_resp\_t** type

- unsigned indx

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

- gnutls\_datum\_t \* oid

  will hold newly allocated buffer with OID of extension, may be NULL

- unsigned int \* critical

  output variable with critical flag, may be NULL.

- gnutls\_datum\_t \* data

  will hold newly allocated buffer with extension data, may be NULL

## DESCRIPTION

This function will return all information about the requested extension in the OCSP response.  The information returned is the OID, the critical flag, and the data itself.  The extension OID will be stored as a string.  Any of  *oid* ,  *critical* , and  *data* may be NULL which means that the caller is not interested in getting that information back.

The caller needs to deallocate memory by calling **gnutls\_free()** on\
  *oid* -\>data and  *data* -\>data.

Since 3.7.0  *oid* -\>size does not account for the terminating null byte.

## RETURNS

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