gnutls\_anti\_replay\_set\_window(3) gnutls gnutls\_anti\_replay\_set\_window(3)

# [NAME](#NAME)

gnutls\_anti\_replay\_set\_window - API function

# [SYNOPSIS](#SYNOPSIS)

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

**void gnutls\_anti\_replay\_set\_window(gnutls\_anti\_replay\_t anti\_replay, unsigned int window);**

# [ARGUMENTS](#ARGUMENTS)

[gnutls\_anti\_replay\_t anti\_replay](#gnutls_anti_replay_t)

is a **gnutls\_anti\_replay\_t** type.

[unsigned int window](#unsigned)

is the time window recording ClientHello, in milliseconds

# [DESCRIPTION](#DESCRIPTION)

Sets the time window used for ClientHello recording. In order to protect against replay attacks, the server records ClientHello messages within this time period from the last update, and considers it a replay when a ClientHello outside of the period; if a ClientHello arrives within this period, the server checks the database and detects duplicates.

For the details of the algorithm, see RFC 8446, section 8.2.

# [SINCE](#SINCE)

3.6.5

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