---
name: "gnutls_x509_crq_get_extension_info"
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_info"
---

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

API function

## NAME

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

## SYNOPSIS

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

**int gnutls\_x509\_crq\_get\_extension\_info(gnutls\_x509\_crq\_t** *crq***, unsigned** *indx***, void \*** *oid***, size\_t \*** *sizeof\_oid***, unsigned int \*** *critical***);**

## 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 \* oid

  a pointer to store the OID

- size\_t \* sizeof\_oid

  initially holds the maximum size of  *oid* , on return holds actual size of  *oid* .

- unsigned int \* critical

  output variable with critical flag, may be NULL.

## DESCRIPTION

This function will return the requested extension OID in the certificate, and the critical flag for it.  The extension OID will be stored as a string in the provided buffer.  Use **gnutls\_x509\_crq\_get\_extension\_data()** to extract the data.

If the buffer provided is not long enough to hold the output, then \* *sizeof\_oid* is updated and **GNUTLS\_E\_SHORT\_MEMORY\_BUFFER** will be returned.

## 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/