.\"	$NetBSD: hifn.4,v 1.9 2018/06/15 23:11:56 wiz Exp $
.\"	$OpenBSD: hifn.4,v 1.32 2002/09/26 07:55:40 miod Exp $
.\"	$FreeBSD: src/share/man/man4/hifn.4,v 1.1.2.2 2003/10/08 23:57:50 sam Exp $
.\"
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.Dd June 13, 2018
.Dt HIFN 4
.Os
.Sh NAME
.Nm hifn
.Nd Hifn 7751/7951/7811/7955/7956 crypto accelerator
.Sh SYNOPSIS
.Cd "hifn* at pci? dev ? function ?"
.Sh DESCRIPTION
The
.Nm
driver supports various cards containing the Hifn 7751, 7951,
7811, 7955, and 7956
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
Comes with 512KB SRAM.
.It XL-Crypt
Only board based on 7811 (which is faster than 7751 and has
a random number generator).
.It NetSec 7751
Supports the most IPsec sessions, with 1MB SRAM.
.It Soekris Engineering vpn1201 and vpn1211
Contains a 7951 and supports symmetric and random number operations.
.It Soekris Engineering vpn1401 and vpn1411
Contains a 7955 and supports symmetric and random number operations.
.El
.Pp
The
.Nm
driver registers itself to accelerate DES, Triple-DES,
AES (7955 and 7956 only), ARC4, MD5,
MD5-HMAC, SHA1, and SHA1-HMAC operations for
.Xr opencrypto 9 ,
and thus for
.Xr ipsec 4
and
.Xr crypto 4 .
.Pp
The Hifn
.Tn 7951 ,
.Tn 7811 ,
.Tn 7955 ,
and
.Tn 7956
may also supply data to the kernel
.Xr rnd 4
subsystem.
.Sh SEE ALSO
.Xr crypto 4 ,
.Xr intro 4 ,
.Xr ipsec 4 ,
.Xr rnd 4 ,
.Xr opencrypto 9
.Sh HISTORY
The
.Nm
device driver appeared in
.Ox 2.7 .
The
.Nm
device driver was imported to
.Fx 5.0 ,
back-ported to
.Fx 4.8 ,
and subsequently imported into
.Nx 2.0 .
.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.
.Pp
Support for the 7955 and 7956 is incomplete; the asymmetric crypto
facilities are to be added and the performance is suboptimal.
.Pp
Supplying data to the kernel
.Xr rnd 4
subsystem has been disabled, pending verification that the on-chip
RNG is statistically adequate.
.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.