.\"	$OpenBSD: hifn.4,v 1.26 2002/02/13 03:22:42 deraadt Exp $
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.\" Copyright (c) 2000 Theo de Raadt
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.Dd March 16, 2000
.Dt HIFN 4
.Os
.Sh NAME
.Nm hifn
.Nd Hifn 7751/7951/7811 crypto accelerator
.Sh SYNOPSIS
.Cd "hifn* at pci? dev ? function ?"
.Sh DESCRIPTION
The
.Nm
driver supports various cards containing the Hifn 7751, Hifn 7951, or
Hifn 7811
chipsets, such as
.Bl -tag -width namenamenamena -offset indent
.It Invertex AEON
No longer being made.
Came as 128KB SRAM model, or 2MB DRAM model.
.It Hifn 7751
Reference board with 512KB SRAM.
.It PowerCrypt
See
.Pa http://www.powercrypt.com/ .
Comes with 512KB SRAM.
.It XL-Crypt
See
.Pa http://www.powercrypt.com/ .
Only board based on 7811 (which is faster than 7751 and has
a random number generator).
.It NetSec 7751
See
.Pa http://www.netsec.net/ .
Supports the most IPsec sessions, with 1MB SRAM.
.It Soekris Engineering vpn1201 and vpn1211
Contains a 7951 and supports symmetric and random number operations.
.El
.Pp
The
.Nm
driver registers itself to accelerate DES, Triple-DES, MD5-HMAC96,
and SHA1-HMAC96 operations in
.Xr ipsec 4 .
.Pp
The
.Tn Hifn 7951
and
.Tn Hifn 7811
will also supply data to the kernel
.Xr random 4
subsystem.
.Sh BUGS
The 7751 chip starts out at initialization by only supporting compression.
A proprietary algorithm, which has been reverse engineered, is required to
unlock the cryptographic functionality of the chip.
It is possible for vendors to make boards which have a lock ID not known
to the driver, but all vendors currently just use the obvious ID which is
13 bytes of 0.
.Sh SEE ALSO
.Xr crypt 3 ,
.Xr ipsec 4 ,
.Xr random 4 ,
.Xr crypto 9
.Sh CAVEATS
The Hifn 9751 shares the same PCI id.
This chip is basically a 7751, but with the cryptographic functions missing.
Instead, the 9751 is only capable of doing compression.
Since we do not currently attempt to use any of these chips to do
compression, the 9751-based cards are not useful.
.Sh HISTORY
The
.Nm
device driver appeared in
.Ox 2.7 .