NAME
ntp.keys - NTP symmetric key file format ntp.keys - NTP symmetric key file format configuration file 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 *[B-Font]-k command line option or the *[B-Font]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

*[I-Font]keyno *[I-Font]type *[I-Font]key

where *[I-Font]keyno is a positive integer (between 1 and 65534), *[I-Font]type is the message digest algorithm, and *[I-Font]key is the key itself.

The *[I-Font]key may be given in a format controlled by the *[I-Font]type field. The *[I-Font]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 *[I-Font]type must be either SHA or SHA1.

What follows are some key types, and corresponding formats:

The key is 1 to 16 printable characters terminated by an EOL, whitespace, or a # (which is the "start of comment" character).

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. cvt_prog='/usr/local/gnu/share/autogen/texi2man' 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 $list } 1>.doc 2>/dev/null sed -f .cmds .doc | /opt/csw/bin/ggrep -E -v '^[ ]*$' | $cvt_prog the default name of the configuration file ntp.conf(5), ntpd(8), ntpdate(8), ntpdc(8), sntp(1) The University of Delaware 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>. Please send bug reports to: http://bugs.ntp.org, bugs@ntp.org This document corresponds to version 4.2.7p410 of NTP. This document was derived from FreeBSD.

This manual page was AutoGen-erated from the ntp.keys option definitions.