gnutls\_certificate\_set\_pin\_function(3) gnutls gnutls\_certificate\_set\_pin\_function(3)

# [NAME](#NAME)

gnutls\_certificate\_set\_pin\_function - API function

# [SYNOPSIS](#SYNOPSIS)

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

**void gnutls\_certificate\_set\_pin\_function(gnutls\_certificate\_credentials\_t cred, gnutls\_pin\_callback\_t fn, void * userdata);**

# [ARGUMENTS](#ARGUMENTS)

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

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

[gnutls\_pin\_callback\_t fn](#gnutls_pin_callback_t)

A PIN callback

[void * userdata](#void)

Data to be passed in the callback

# [DESCRIPTION](#DESCRIPTION)

This function will set a callback function to be used when required to access a protected object. This function overrides any other global PIN functions.

Note that this function must be called right after initialization to have effect.

# [SINCE](#SINCE)

3.1.0

# [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_set_pin_function(3) from gnutls 3.8.13-r1 (Chainguard OS)
Source: https://gitlab.com/gnutls/gnutls