1.\" Copyright (c) 2010 Konstantin Belousov <kib@FreeBSD.org> 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD: src/share/man/man4/aesni.4,v 1.3 2010/09/09 21:37:05 brueffer Exp $ 26.\" 27.Dd October 12, 2010 28.Dt AESNI 4 29.Os 30.Sh NAME 31.Nm aesni 32.Nd "driver for the AES accelerator on Intel CPUs" 33.Sh SYNOPSIS 34To compile this driver into the kernel, 35place the following lines in your 36kernel configuration file: 37.Bd -ragged -offset indent 38.Cd "device crypto" 39.Cd "device aesni" 40.Ed 41.Pp 42Alternatively, to load the driver as a 43module at boot time, place the following line in 44.Xr loader.conf 5 : 45.Bd -literal -offset indent 46aesni_load="YES" 47.Ed 48.Sh DESCRIPTION 49Starting with some models of Core i5/i7, Intel processors implement 50a new set of instructions called AESNI. 51The set of six instructions accelerates the calculation of the key 52schedule for key lengths of 128, 192, and 256 of the Advanced 53Encryption Standard (AES) symmetric cipher, and provides a hardware 54implementation of the regular and the last encryption and decryption 55rounds. 56.Pp 57The processor capability is reported as AESNI in the Features2 line at boot. 58The 59.Nm 60driver does not attach on systems that lack the required CPU capability. 61.Pp 62The 63.Nm 64driver registers itself to accelerate AES operations for 65.Xr crypto 4 . 66Besides speed, the advantage of using the 67.Nm 68driver is that the AESNI operation 69is data-independent, thus eliminating some attack vectors based on 70measuring cache use and timings typically present in table-driven 71implementations. 72.Sh SEE ALSO 73.Xr crypt 3 , 74.Xr crypto 4 , 75.Xr intro 4 , 76.Xr ipsec 4 , 77.Xr padlock 4 , 78.Xr random 4 , 79.Xr crypto 9 80.Sh HISTORY 81The 82.Nm 83driver first appeared in 84.Fx 9.0 . 85It was ported to 86.Dx 87by 88.An Alex Hornung . 89.Sh AUTHORS 90.An -nosplit 91The 92.Nm 93driver was written by 94.An Konstantin Belousov Aq Mt kib@FreeBSD.org . 95The key schedule calculation code was adopted from the sample provided 96by Intel and used in the analogous 97.Ox 98driver. 99