| NTP_KEYS(5) | File | NTP_KEYS(5) | 
NAME
 ntp.keys — 
NTP symmetric key file format
 
 
NAME
 ntp.keys — NTP symmetric key file format
SYNOPSIS
 /etc/ntp.keys
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 “Authentication Support” section of the 
ntp.conf(5) page.
ntpd(8) reads its keys from a file specified using the -k command line option or the 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.
The key file uses the same comment conventions as the configuration file. Key entries use a fixed format of the form
keyno type key
where keyno is a positive integer (between 1 and 65534), type is the message digest algorithm, and key is the key itself.
The key may be given in a format controlled by the type field. The type MD5 is always supported. If 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 type must be either SHA or SHA1.
What follows are some key types, and corresponding formats:
- 
MD5
- 
The key is 1 to 16 printable characters terminated by an EOL, whitespace, or a #(which is the "start of comment" character).
 
- 
SHA
- 
- 
SHA1
- 
- 
RMD160
- 
The key is a hex-encoded ASCII string of 40 characters, which is truncated as necessary.
Note that the keys used by the ntpq(8) and 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.
 
OPTIONS
- 
--help
- 
Display usage information and exit.
- 
--more-help
- 
Pass the extended usage information through a pager.
- 
--version [{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.
 
OPTION PRESETS
 Any option that is not marked as  not presettable may be preset by loading values from environment variables named:
  NTP_KEYS_<option-name> or NTP_KEYS cvt_prog='/usr/local/gnu/share/autogen/texi2mdoc' cvt_prog=`cd ̀dirname "$cvt_prog"̀ >/dev/null && pwd
         `/`basename "$cvt_prog"` cd $tmp_dir test -x "$cvt_prog" || die "'$cvt_prog' is not executable" {
    list='synopsis description options option-presets'
    for f in $list ; do cat $f ; echo ; done
    rm -f $list name
    list='implementation-notes environment files examples exit-status errors
        compatibility see-also conforming-to history authors copyright bugs
        notes'
    for f in $list ; do cat $f ; echo ; done > .end-doc
    rm -f $list
    list=`ls -1 *`' .end-doc'
    for f in $list ; do cat $f ; echo ; done
    rm -f $list } 1>.doc 2>/dev/null sed -f .cmds .doc | /usr/local/gnu/bin/grep -E -v '^[ 	]*$' | $cvt_prog
ENVIRONMENT
 See  OPTION PRESETS for configuration environment variables.
FILES
- 
/etc/ntp.keys
- 
the default name of the configuration file
 
EXIT STATUS
 One of the following exit values will be returned:
- 
0  (EXIT_SUCCESS)
- 
Successful program execution.
- 
1  (EXIT_FAILURE)
- 
The operation failed or the command syntax was not valid.
- 
70  (EX_SOFTWARE)
- 
libopts had an internal operational error.  Please report it to autogen-users@lists.sourceforge.net.  Thank you.
 
AUTHORS
 The University of Delaware
COPYRIGHT
 Copyright (C) 1970-2013 The University of Delaware all rights reserved. This program is released under the terms of the NTP license, <http://ntp.org/license>.
BUGS
 Please send bug reports to: http://bugs.ntp.org, bugs@ntp.org
NOTES
 This document corresponds to version 4.2.7p404 of NTP. This document was derived from FreeBSD.
This manual page was AutoGen-erated from the ntp.keys option definitions.