.\"	$OpenBSD: crypto.4,v 1.11 2004/06/20 17:37:15 aaron Exp $
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.\" Copyright (c) 2001 Theo de Raadt
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.Dd May 13, 2001
.Dt CRYPTO 4
.Os
.Sh NAME
.Nm crypto
.Nd hardware crypto access driver
.Sh SYNOPSIS
.Nm "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_SKIPJACK_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_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 ises 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 .