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 .Dd November 21 2016
 .Dt NTP_KEYS 5 File Formats
 .Os SunOS 5.10
 .\"  EDIT THIS FILE WITH CAUTION  (ntp.mdoc)
 .\"
 .\" $FreeBSD$
 .\"
 .\"  It has been AutoGen-ed  November 21, 2016 at 08:02:06 AM by AutoGen 5.18.5
 .\"  From the definitions    ntp.keys.def
 .\"  and the template file   agmdoc-file.tpl
 .Sh NAME
 .Nm ntp.keys
 .Nd NTP symmetric key file format
-
-.Sh NAME
-.Nm ntp.keys
-.Nd NTP symmetric key file format
 .Sh SYNOPSIS
 .Nm
 .Op Fl \-option\-name
 .Op Fl \-option\-name Ar value
 .Pp
 All arguments must be options.
 .Pp
 .Sh DESCRIPTION
 This document describes the format of an NTP symmetric key file.
 For a description of the use of this type of file, see the
 .Qq Authentication Support
 section of the
 .Xr ntp.conf 5
 page.
 .Pp
 .Xr ntpd 8
 reads its keys from a file specified using the
 .Fl k
 command line option or the
 .Ic keys
 statement in the configuration file.
 While key number 0 is fixed by the NTP standard
 (as 56 zero bits)
 and may not be changed,
 one or more keys numbered between 1 and 65534
 may be arbitrarily set in the keys file.
 .Pp
 The key file uses the same comment conventions
 as the configuration file.
 Key entries use a fixed format of the form
 .Pp
 .D1 Ar keyno type key opt_IP_list
 .Pp
 where
 .Ar keyno
 is a positive integer (between 1 and 65534),
 .Ar type
 is the message digest algorithm,
 and
 .Ar key
 is the key itself, and
 .Ar opt_IP_list
 is an optional comma\-separated list of IPs
 that are allowed to serve time.
 If
 .Ar opt_IP_list
 is empty,
 any properly\-authenticated server message will be
 accepted.
 .Pp
 The
 .Ar key
 may be given in a format
 controlled by the
 .Ar type
 field.
 The
 .Ar type
 .Li MD5
 is always supported.
 If
 .Li ntpd
 was built with the OpenSSL library
 then any digest library supported by that library may be specified.
 However, if compliance with FIPS 140\-2 is required the
 .Ar type
 must be either
 .Li SHA
 or
 .Li SHA1 .
 .Pp
 What follows are some key types, and corresponding formats:
 .Pp
 .Bl -tag -width RMD160 -compact
 .It Li MD5
 The key is 1 to 16 printable characters terminated by
 an EOL,
 whitespace,
 or
 a
 .Li #
 (which is the "start of comment" character).
 .Pp
 .It Li SHA
 .It Li SHA1
 .It Li RMD160
 The key is a hex\-encoded ASCII string of 40 characters,
 which is truncated as necessary.
 .El
 .Pp
 Note that the keys used by the
 .Xr ntpq 8
 and
 .Xr ntpdc 8
 programs are checked against passwords
 requested by the programs and entered by hand,
 so it is generally appropriate to specify these keys in ASCII format.
 .Sh "OPTIONS"
 .Bl -tag
 .It Fl \-help
 Display usage information and exit.
 .It Fl \-more\-help
 Pass the extended usage information through a pager.
 .It Fl \-version Op Brq Ar v|c|n
 Output version of program and exit.  The default mode is `v', a simple
 version.  The `c' mode will print copyright information and `n' will
 print the full copyright notice.
 .El
 .Sh "OPTION PRESETS"
 Any option that is not marked as \fInot presettable\fP may be preset
 by loading values from environment variables named:
 .nf
   \fBNTP_KEYS_<option\-name>\fP or \fBNTP_KEYS\fP
 .fi
 .ad
 .Sh "ENVIRONMENT"
 See \fBOPTION PRESETS\fP for configuration environment variables.
 .Sh FILES
 .Bl -tag -width /etc/ntp.keys -compact
 .It Pa /etc/ntp.keys
 the default name of the configuration file
 .El
 .Sh "EXIT STATUS"
 One of the following exit values will be returned:
 .Bl -tag
 .It 0 " (EXIT_SUCCESS)"
 Successful program execution.
 .It 1 " (EXIT_FAILURE)"
 The operation failed or the command syntax was not valid.
 .It 70 " (EX_SOFTWARE)"
 libopts had an internal operational error.  Please report
 it to autogen\-users@lists.sourceforge.net.  Thank you.
 .El
 .Sh "SEE ALSO"
 .Xr ntp.conf 5 ,
 .Xr ntpd 8 ,
 .Xr ntpdate 8 ,
 .Xr ntpdc 8 ,
 .Xr sntp 8
 .Sh "AUTHORS"
 The University of Delaware and Network Time Foundation
 .Sh "COPYRIGHT"
 Copyright (C) 1992\-2016 The University of Delaware and Network Time Foundation all rights reserved.
 This program is released under the terms of the NTP license, <http://ntp.org/license>.
 .Sh "BUGS"
 Please send bug reports to: http://bugs.ntp.org, bugs@ntp.org
 .Sh NOTES
 This document was derived from FreeBSD.
 .Pp
 This manual page was \fIAutoGen\fP\-erated from the \fBntp.keys\fP
 option definitions.