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