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authorColin Watson <cjwatson@debian.org>2011-09-06 09:45:52 +0100
committerColin Watson <cjwatson@debian.org>2011-09-06 09:45:52 +0100
commitf38224d546cdde55f45c13d3d8225d273a3f920e (patch)
treea91a26b88ac90dc72d0ea3767feabb341eaa50a8 /ssh-rand-helper.8
parent338146a3fc257e216fe5c10fe40e6896b40d7739 (diff)
parente90790abaf031e037f444a6658e136e48577ea49 (diff)
merge 5.9p1
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1.\" $Id: ssh-rand-helper.8,v 1.3 2007/01/22 01:44:53 djm Exp $
2.\"
3.\" Copyright (c) 2002 Damien Miller. All rights reserved.
4.\"
5.\" Redistribution and use in source and binary forms, with or without
6.\" modification, are permitted provided that the following conditions
7.\" are met:
8.\" 1. Redistributions of source code must retain the above copyright
9.\" notice, this list of conditions and the following disclaimer.
10.\" 2. Redistributions in binary form must reproduce the above copyright
11.\" notice, this list of conditions and the following disclaimer in the
12.\" documentation and/or other materials provided with the distribution.
13.\"
14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24.\"
25.Dd April 14, 2002
26.Dt SSH-RAND-HELPER 8
27.Os
28.Sh NAME
29.Nm ssh-rand-helper
30.Nd random number gatherer for OpenSSH
31.Sh SYNOPSIS
32.Nm ssh-rand-hlper
33.Op Fl vxXh
34.Op Fl b Ar bytes
35.Sh DESCRIPTION
36.Nm
37is a small helper program used by
38.Xr ssh 1 ,
39.Xr ssh-add 1 ,
40.Xr ssh-agent 1 ,
41.Xr ssh-keygen 1 ,
42.Xr ssh-keyscan 1
43and
44.Xr sshd 8
45to gather random numbers of cryptographic quality if the
46.Xr openssl 4
47library has not been configured to provide them itself.
48.Pp
49Normally
50.Nm
51will generate a strong random seed and provide it to the calling
52program via standard output. If standard output is a tty,
53.Nm
54will instead print the seed in hexidecimal format unless told otherwise.
55.Pp
56.Nm
57will by default gather random numbers from the system commands listed
58in
59.Pa /etc/ssh/ssh_prng_cmds .
60The output of each of the commands listed will be hashed and used to
61generate a random seed for the calling program.
62.Nm
63will also store seed files in
64.Pa ~/.ssh/prng_seed
65between executions.
66.Pp
67Alternately,
68.Nm
69may be configured at build time to collect random numbers from a
70EGD/PRNGd server via a unix domain or localhost tcp socket.
71.Pp
72This program is not intended to be run by the end-user, so the few
73commandline options are for debugging purposes only.
74.Bl -tag -width Ds
75.It Fl b Ar bytes
76Specify the number of random bytes to include in the output.
77.It Fl x
78Output a hexidecimal instead of a binary seed.
79.It Fl X
80Force output of a binary seed, even if standard output is a tty
81.It Fl v
82Turn on debugging message. Multiple
83.Fl v
84options will increase the debugging level.
85.It Fl h
86Display a summary of options.
87.El
88.Sh AUTHORS
89Damien Miller <djm@mindrot.org>
90.Sh SEE ALSO
91.Xr ssh 1 ,
92.Xr ssh-add 1 ,
93.Xr ssh-keygen 1 ,
94.Xr sshd 8