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.\" $FreeBSD$ 26.\" 27.Dd December 14, 2015 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 cryptodev" 40.Cd "device aesni" 41.Ed 42.Pp 43Alternatively, to load the driver as a 44module at boot time, place the following line in 45.Xr loader.conf 5 : 46.Bd -literal -offset indent 47aesni_load="YES" 48.Ed 49.Sh DESCRIPTION 50Starting with some models of Core i5/i7, Intel processors implement 51a new set of instructions called AESNI. 52The set of six instructions accelerates the calculation of the key 53schedule for key lengths of 128, 192, and 256 of the Advanced 54Encryption Standard (AES) symmetric cipher, and provides a hardware 55implementation of the regular and the last encryption and decryption 56rounds. 57.Pp 58The processor capability is reported as AESNI in the Features2 line at boot. 59The 60.Nm 61driver does not attach on systems that lack the required CPU capability. 62.Pp 63The 64.Nm 65driver registers itself to accelerate AES operations for 66.Xr crypto 4 . 67Besides speed, the advantage of using the 68.Nm 69driver is that the AESNI operation 70is data-independent, thus eliminating some attack vectors based on 71measuring cache use and timings typically present in table-driven 72implementations. 73.Sh SEE ALSO 74.Xr crypt 3 , 75.Xr crypto 4 , 76.Xr intro 4 , 77.Xr ipsec 4 , 78.Xr padlock 4 , 79.Xr random 4 , 80.Xr crypto 9 81.Sh HISTORY 82The 83.Nm 84driver first appeared in 85.Fx 9.0 . 86.Sh AUTHORS 87.An -nosplit 88The 89.Nm 90driver was written by 91.An Konstantin Belousov Aq Mt kib@FreeBSD.org . 92The key schedule calculation code was adopted from the sample provided 93by Intel and used in the analogous 94.Ox 95driver. 96