.\"	$OpenBSD: crypto.4,v 1.16 2012/03/24 07:57:47 jmc Exp $
.\"
.\" Copyright (c) 2001 Theo de Raadt
.\" 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 ``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 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.
.\"
.Dd $Mdocdate: March 24 2012 $
.Dt CRYPTO 4
.Os
.Sh NAME
.Nm crypto
.Nd hardware crypto access driver
.Sh SYNOPSIS
.Cd "pseudo-device crypto" Op Ar count
.Sh DESCRIPTION
The
.Nm
driver provides userland applications access to hardware crypto support
via the kernel.
The
.Pa /dev/crypto
device node primarily operates in an
.Xr ioctl 2
based model, permitting a variety of applications to query device capabilities,
submit transactions, and get results.
.Pp
If
.Ar count
is given in the specification, and is greater than 0, a maximum of one
.Nm crypto
device is created.
.Pp
The following
.Xr ioctl 2
calls apply only to the
.Nm crypto
devices:
.Bl -tag -width CIOCGSESSION
.It Dv CIOCGSESSION
Set up a new crypto session for a new type of operation.
.It Dv CIOCFSESSION
Free a previously established session.
.It Dv CIOCCRYPT
Perform a crypto operation against a previously set up session.
.El
.Sh FEATURES
Depending on hardware being present, the following symmetric and
asymmetric cryptographic features are potentially available from
.Pa /dev/crypto :
.Pp
.Bl -tag -compact -width CRYPTO_RIPEMD160_HMAC -offset indent
.It CRYPTO_DES_CBC
.It CRYPTO_3DES_CBC
.It CRYPTO_BLF_CBC
.It CRYPTO_CAST_CBC
.It CRYPTO_MD5_HMAC
.It CRYPTO_SHA1_HMAC
.It CRYPTO_RIPEMD160_HMAC
.It CRYPTO_MD5_KPDK
.It CRYPTO_SHA1_KPDK
.It CRYPTO_AES_CBC
.It CRYPTO_AES_CTR
.It CRYPTO_AES_XTS
.It CRYPTO_ARC4
.It CRYPTO_MD5
.It CRYPTO_SHA1
.It CRK_MOD_EXP
.It CRK_MOD_EXP_CRT
.It CRK_DSA_SIGN
.It CRK_DSA_VERIFY
.It CRK_DH_COMPUTE_KEY
.El
.Sh FILES
.Bl -tag -width /dev/crypto -compact
.It Pa /dev/crypto
crypto access device
.El
.Sh SEE ALSO
.Xr hifn 4 ,
.Xr lofn 4 ,
.Xr noct 4 ,
.Xr nofn 4 ,
.Xr safe 4 ,
.Xr ubsec 4 ,
.Xr crypto 9
.Sh HISTORY
The
.Nm
driver appeared in
.Ox 3.0 .