1.\" 2.\" Copyright (c) 2004 Sam Leffler 3.\" All rights reserved. 4.\" Copyright (c) 2025 The FreeBSD Foundation 5.\" 6.\" Portions of this documentation were written by Bj\xc3\xb6rn Zeeb 7.\" under sponsorship from the FreeBSD Foundation. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" Based on wlan_ccmp.4. 31.\" 32.Dd June 13, 2025 33.Dt WLAN_GCMP 4 34.Os 35.Sh NAME 36.Nm wlan_gcmp 37.Nd AES-GCMP crypto support for 802.11 devices 38.Sh SYNOPSIS 39.Cd "device wlan_gcmp" 40.Sh DESCRIPTION 41The 42.Nm 43module handles the 44.Em Galois/Counter Mode Protocol 45cryptographic requirements of the IEEE 802.11ad and WPA2/WPA3 protocols. 46It does encapsulation and decapsulation of GCMP-encoded 802.11 frames 47and optionally calculates the AES-GCMP cipher. 48The 49.Nm 50module is an 802.11 cryptographic plugin module for use by the 51.Xr wlan 4 52module. 53This module is automatically loaded if an AES-GCMP key is configured; 54typically by a WPA supplicant program such as wpa_supplicant, 55or a WPA authenticator program such as 56.Nm hostapd . 57Should the underlying network device not be capable of doing the AES-GCMP 58calculations in hardware, the 59.Nm 60module will do the work. 61.Sh SEE ALSO 62.Xr wlan 4 , 63.Xr wlan_ccmp 4 , 64.Xr wlan_tkip 4 , 65.Xr wlan_wep 4 66.Sh STANDARDS 67More information can be found in the IEEE 802.11, and WPA Standards. 68.Sh HISTORY 69The 70.Nm 71driver first appeared in 72.Fx 15.0 . 73