95 lines
3.1 KiB
Groff
95 lines
3.1 KiB
Groff
.\" Copyright (c) 2010 Konstantin Belousov <kib@FreeBSD.org>
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd September 6, 2010
|
|
.Dt AESNI 4
|
|
.Os
|
|
.Sh NAME
|
|
.Nm aesni
|
|
.Nd "driver for the AES accelerator on Intel CPUs"
|
|
.Sh SYNOPSIS
|
|
To compile this driver into the kernel,
|
|
place the following lines in your
|
|
kernel configuration file:
|
|
.Bd -ragged -offset indent
|
|
.Cd "device crypto"
|
|
.Cd "device aesni"
|
|
.Ed
|
|
.Pp
|
|
Alternatively, to load the driver as a
|
|
module at boot time, place the following line in
|
|
.Xr loader.conf 5 :
|
|
.Bd -literal -offset indent
|
|
aesni_load="YES"
|
|
.Ed
|
|
.Sh DESCRIPTION
|
|
Starting with some models of Core i5/i7, Intel processors implement
|
|
a new set of instructions called AESNI.
|
|
The set of six instructions accelerates the calculation of the key
|
|
schedule for key lengths of 128, 192, and 256 of the Advanced
|
|
Encryption Standard (AES) symmetric cipher, and provides a hardware
|
|
implementation of the regular and the last encryption and decryption
|
|
rounds.
|
|
.Pp
|
|
The processor capability is reported as AESNI in the Features2 line at boot.
|
|
The
|
|
.Nm
|
|
driver does not attach on systems that lack the required CPU capability.
|
|
.Pp
|
|
The
|
|
.Nm
|
|
driver registers itself to accelerate AES operations for
|
|
.Xr crypto 4 .
|
|
Besides speed, the advantage of using the
|
|
.Nm
|
|
driver is that the AESNI operation
|
|
is data-independent, thus eliminating some attack vectors based on
|
|
measuring cache use and timings typically present in table-driven
|
|
implementations.
|
|
.Sh SEE ALSO
|
|
.Xr crypt 3 ,
|
|
.Xr crypto 4 ,
|
|
.Xr intro 4 ,
|
|
.Xr ipsec 4 ,
|
|
.Xr padlock 4 ,
|
|
.Xr random 4 ,
|
|
.Xr crypto 9
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
driver first appeared in
|
|
.Fx 9.0 .
|
|
.Sh AUTHORS
|
|
.An -nosplit
|
|
The
|
|
.Nm
|
|
driver was written by
|
|
.An Konstantin Belousov Aq Mt kib@FreeBSD.org .
|
|
The key schedule calculation code was adopted from the sample provided
|
|
by Intel and used in the analogous
|
|
.Ox
|
|
driver.
|