NetBSD/sbin/rndctl/rndctl.8

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.\" $NetBSD: rndctl.8,v 1.5 1999/03/10 05:16:18 erh Exp $
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.\"
.\" Copyright (c) 1997 Michael Graff
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.\" 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.
.\" 3. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission.
.\"
.\" 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 October 12, 1997
.Dt RNDCTL 8
.Os NetBSD
.Sh NAME
.Nm rndctl
.Nd in-kernel random number generator management tool
.Sh SYNOPSIS
.Nm
.Fl CEce
.Op Fl t Ar devtype
.Op Fl d Ar devname
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.Nm ""
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.Fl l
.Op Fl t Ar devtype
.Op Fl d Ar devname
.Sh DESCRIPTION
The
.Nm
program manages which devices timing information is to be collected by,
and alters the estimation of entropy of sources.
.Sh OPTIONS
The following options are available:
.Bl -tag -width 123456
.It Fl C
Disable collection of timing information for the given
device name or device type.
.It Fl c
Enable collection of timing information for the given
device name of device type.
.It Fl E
Disable entropy estimation from the collected timing information
for the given device name or device type. The timing information is still
collected and mixed into the internal entropy pool, but no entropy is assumed
to be present.
.It Fl e
Enable entropy estimation using the collected timing information
for the given device name or device type.
.It Fl l
List all sources, or only those specified by the
.Ar devtype
or
.Ar devname
specified.
.It Fl t
All devices of type
.Ar devtype
are altered or displayed.
.It Fl d
Only the device named
.Ar devname
is altered or displayed.
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.El
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.Sh WARNINGS
Turning on entropy collection from unsafe sources can weaken system security.
Care should be taken when using this command.
.Sh HISTORY
The
.Nm
program was first made available in
.Nx 1.3 .
.Sh AUTHOR
The
.Nm
program was written by Michael Graff <explorer@flame.org>.
.Sh SEE ALSO
.Xr rnd 4 ,
.Xr rnd 9