Ubuntu Manpage: ntp-keygen — Create a NTP host key

Provided by: ntp_4.2.8p10+dfsg-5ubuntu7.3_amd64

NAME

     ntp-keygen — Create a NTP host key

SYNOPSIS

     ntp-keygen [-flags] [-flag [value]] [--option-name[[=| ]value]]

                All arguments must be options.

DESCRIPTION

This program generates cryptographic data files used by the NTPv4 authentication and
identification schemes. It generates MD5 key files used in symmetric key cryptography. In
addition, if the OpenSSL software library has been installed, it generates keys, certificate
and identity files used in public key cryptography. These files are used for cookie
encryption, digital signature and challenge/response identification algorithms compatible
with the Internet standard security infrastructure.

All files are in PEM-encoded printable ASCII format, so they can be embedded as MIME
attachments in mail to other sites and certificate authorities. By default, files are not
encrypted.

When used to generate message digest keys, the program produces a file containing ten
pseudo-random printable ASCII strings suitable for the MD5 message digest algorithm included
in the distribution. If the OpenSSL library is installed, it produces an additional ten
hex-encoded random bit strings suitable for the SHA1 and other message digest algorithms.
The message digest keys file must be distributed and stored using secure means beyond the
scope of NTP itself. Besides the keys used for ordinary NTP associations, additional keys
can be defined as passwords for the ntpq(1) and ntpdc(1) utility programs.

The remaining generated files are compatible with other OpenSSL applications and other
Public Key Infrastructure (PKI) resources. Certificates generated by this program are
compatible with extant industry practice, although some users might find the interpretation
of X509v3 extension fields somewhat liberal. However, the identity keys are probably not
compatible with anything other than Autokey.

Some files used by this program are encrypted using a private password. The -p option
specifies the password for local encrypted files and the -q option the password for
encrypted files sent to remote sites. If no password is specified, the host name returned
by the Unix gethostname() function, normally the DNS name of the host is used.

The pw option of the crypto configuration command specifies the read password for previously
encrypted local files. This must match the local password used by this program. If not
specified, the host name is used. Thus, if files are generated by this program without
password, they can be read back by ntpd without password but only on the same host.

Normally, encrypted files for each host are generated by that host and used only by that
host, although exceptions exist as noted later on this page. The symmetric keys file,
normally called ntp.keys, is usually installed in /etc. Other files and links are usually
installed in /usr/local/etc, which is normally in a shared filesystem in NFS-mounted
networks and cannot be changed by shared clients. The location of the keys directory can be
changed by the keysdir configuration command in such cases. Normally, this is in /etc.

This program directs commentary and error messages to the standard error stream stderr and
remote files to the standard output stream stdout where they can be piped to other
applications or redirected to files. The names used for generated files and links all begin
with the string ntpkey and include the file type, generating host and filestamp, as
described in the “Cryptographic Data Files” section below.

Running the Program
To test and gain experience with Autokey concepts, log in as root and change to the keys
directory, usually /usr/local/etc When run for the first time, or if all files with names
beginning with ntpkey have been removed, use the ntp-keygen command without arguments to
generate a default RSA host key and matching RSA-MD5 certificate with expiration date one
year hence. If run again without options, the program uses the existing keys and parameters
and generates only a new certificate with new expiration date one year hence.

Run the command on as many hosts as necessary. Designate one of them as the trusted host
(TH) using ntp-keygen with the -T option and configure it to synchronize from reliable
Internet servers. Then configure the other hosts to synchronize to the TH directly or
indirectly. A certificate trail is created when Autokey asks the immediately ascendant host
towards the TH to sign its certificate, which is then provided to the immediately descendant
host on request. All group hosts should have acyclic certificate trails ending on the TH.

The host key is used to encrypt the cookie when required and so must be RSA type. By
default, the host key is also the sign key used to encrypt signatures. A different sign key
can be assigned using the -S option and this can be either RSA or DSA type. By default, the
signature message digest type is MD5, but any combination of sign key type and message
digest type supported by the OpenSSL library can be specified using the -c option. The
rules say cryptographic media should be generated with proventic filestamps, which means the
host should already be synchronized before this program is run. This of course creates a
chicken-and-egg problem when the host is started for the first time. Accordingly, the host
time should be set by some other means, such as eyeball-and-wristwatch, at least so that the
certificate lifetime is within the current year. After that and when the host is
synchronized to a proventic source, the certificate should be re-generated.

Additional information on trusted groups and identity schemes is on the “Autokey Public-Key
Authentication” page.

The ntpd(8) configuration command crypto pw password specifies the read password for
previously encrypted files. The daemon expires on the spot if the password is missing or
incorrect. For convenience, if a file has been previously encrypted, the default read
password is the name of the host running the program. If the previous write password is
specified as the host name, these files can be read by that host with no explicit password.

File names begin with the prefix ntpkey_ and end with the postfix _hostname.filestamp, where
hostname is the owner name, usually the string returned by the Unix gethostname() routine,
and filestamp is the NTP seconds when the file was generated, in decimal digits. This both
guarantees uniqueness and simplifies maintenance procedures, since all files can be quickly
removed by a rm ntpkey* command or all files generated at a specific time can be removed by
a rm *filestamp command. To further reduce the risk of misconfiguration, the first two
lines of a file contain the file name and generation date and time as comments.

All files are installed by default in the keys directory /usr/local/etc, which is normally
in a shared filesystem in NFS-mounted networks. The actual location of the keys directory
and each file can be overridden by configuration commands, but this is not recommended.
Normally, the files for each host are generated by that host and used only by that host,
although exceptions exist as noted later on this page.

Normally, files containing private values, including the host key, sign key and
identification parameters, are permitted root read/write-only; while others containing
public values are permitted world readable. Alternatively, files containing private values
can be encrypted and these files permitted world readable, which simplifies maintenance in
shared file systems. Since uniqueness is insured by the hostname and file name extensions,
the files for a NFS server and dependent clients can all be installed in the same shared
directory.

The recommended practice is to keep the file name extensions when installing a file and to
install a soft link from the generic names specified elsewhere on this page to the generated
files. This allows new file generations to be activated simply by changing the link. If a
link is present, ntpd follows it to the file name to extract the filestamp. If a link is
not present, ntpd(8) extracts the filestamp from the file itself. This allows clients to
verify that the file and generation times are always current. The ntp-keygen program uses
the same timestamp extension for all files generated at one time, so each generation is
distinct and can be readily recognized in monitoring data.

Running the program
The safest way to run the ntp-keygen program is logged in directly as root. The recommended
procedure is change to the keys directory, usually /usr/local/etc, then run the program.
When run for the first time, or if all ntpkey files have been removed, the program generates
a RSA host key file and matching RSA-MD5 certificate file, which is all that is necessary in
many cases. The program also generates soft links from the generic names to the respective
files. If run again, the program uses the same host key file, but generates a new
certificate file and link.

The host key is used to encrypt the cookie when required and so must be RSA type. By
default, the host key is also the sign key used to encrypt signatures. When necessary, a
different sign key can be specified and this can be either RSA or DSA type. By default, the
message digest type is MD5, but any combination of sign key type and message digest type
supported by the OpenSSL library can be specified, including those using the MD2, MD5, SHA,
SHA1, MDC2 and RIPE160 message digest algorithms. However, the scheme specified in the
certificate must be compatible with the sign key. Certificates using any digest algorithm
are compatible with RSA sign keys; however, only SHA and SHA1 certificates are compatible
with DSA sign keys.

Private/public key files and certificates are compatible with other OpenSSL applications and
very likely other libraries as well. Certificates or certificate requests derived from them
should be compatible with extant industry practice, although some users might find the
interpretation of X509v3 extension fields somewhat liberal. However, the identification
parameter files, although encoded as the other files, are probably not compatible with
anything other than Autokey.

Running the program as other than root and using the Unix su command to assume root may not
work properly, since by default the OpenSSL library looks for the random seed file .rnd in
the user home directory. However, there should be only one .rnd, most conveniently in the
root directory, so it is convenient to define the $RANDFILE environment variable used by the
OpenSSL library as the path to /.rnd.

Installing the keys as root might not work in NFS-mounted shared file systems, as NFS
clients may not be able to write to the shared keys directory, even as root. In this case,
NFS clients can specify the files in another directory such as /etc using the keysdir
command. There is no need for one client to read the keys and certificates of other clients
or servers, as these data are obtained automatically by the Autokey protocol.

Ordinarily, cryptographic files are generated by the host that uses them, but it is possible
for a trusted agent (TA) to generate these files for other hosts; however, in such cases
files should always be encrypted. The subject name and trusted name default to the hostname
of the host generating the files, but can be changed by command line options. It is
convenient to designate the owner name and trusted name as the subject and issuer fields,
respectively, of the certificate. The owner name is also used for the host and sign key
files, while the trusted name is used for the identity files. seconds. seconds. s Trusted
Hosts and Groups Each cryptographic configuration involves selection of a signature scheme
and identification scheme, called a cryptotype, as explained in the Authentication Options
section of ntp.conf(5). The default cryptotype uses RSA encryption, MD5 message digest and
TC identification. First, configure a NTP subnet including one or more low-stratum trusted
hosts from which all other hosts derive synchronization directly or indirectly. Trusted
hosts have trusted certificates; all other hosts have nontrusted certificates. These hosts
will automatically and dynamically build authoritative certificate trails to one or more
trusted hosts. A trusted group is the set of all hosts that have, directly or indirectly, a
certificate trail ending at a trusted host. The trail is defined by static configuration
file entries or dynamic means described on the Automatic NTP Configuration Options section
of ntp.conf(5).

On each trusted host as root, change to the keys directory. To insure a fresh fileset,
remove all ntpkey files. Then run ntp-keygen -T to generate keys and a trusted certificate.
On all other hosts do the same, but leave off the -T flag to generate keys and nontrusted
certificates. When complete, start the NTP daemons beginning at the lowest stratum and
working up the tree. It may take some time for Autokey to instantiate the certificate
trails throughout the subnet, but setting up the environment is completely automatic.

If it is necessary to use a different sign key or different digest/signature scheme than the
default, run ntp-keygen with the -S type option, where type is either RSA or DSA. The most
often need to do this is when a DSA-signed certificate is used. If it is necessary to use a
different certificate scheme than the default, run ntp-keygen with the -c scheme option and
selected scheme as needed. f ntp-keygen is run again without these options, it generates a
new certificate using the same scheme and sign key.

After setting up the environment it is advisable to update certificates from time to time,
if only to extend the validity interval. Simply run ntp-keygen with the same flags as
before to generate new certificates using existing keys. However, if the host or sign key
is changed, ntpd(8) should be restarted. When ntpd(8) is restarted, it loads any new files
and restarts the protocol. Other dependent hosts will continue as usual until signatures
are refreshed, at which time the protocol is restarted.

Identity Schemes
As mentioned on the Autonomous Authentication page, the default TC identity scheme is
vulnerable to a middleman attack. However, there are more secure identity schemes
available, including PC, IFF, GQ and MV described on the "Identification Schemes" page
(maybe available at http://www.eecis.udel.edu/%7emills/keygen.html). These schemes are
based on a TA, one or more trusted hosts and some number of nontrusted hosts. Trusted hosts
prove identity using values provided by the TA, while the remaining hosts prove identity
using values provided by a trusted host and certificate trails that end on that host. The
name of a trusted host is also the name of its sugroup and also the subject and issuer name
on its trusted certificate. The TA is not necessarily a trusted host in this sense, but
often is.

In some schemes there are separate keys for servers and clients. A server can also be a
client of another server, but a client can never be a server for another client. In
general, trusted hosts and nontrusted hosts that operate as both server and client have
parameter files that contain both server and client keys. Hosts that operate only as
clients have key files that contain only client keys.

The PC scheme supports only one trusted host in the group. On trusted host alice run
ntp-keygen -P -p password to generate the host key file ntpkey_RSAkey_alice.filestamp and
trusted private certificate file ntpkey_RSA-MD5_cert_alice.filestamp. Copy both files to
all group hosts; they replace the files which would be generated in other schemes. On each
host bob install a soft link from the generic name ntpkey_host_bob to the host key file and
soft link ntpkey_cert_bob to the private certificate file. Note the generic links are on
bob, but point to files generated by trusted host alice. In this scheme it is not possible
to refresh either the keys or certificates without copying them to all other hosts in the
group.

For the IFF scheme proceed as in the TC scheme to generate keys and certificates for all
group hosts, then for every trusted host in the group, generate the IFF parameter file. On
trusted host alice run ntp-keygen -T -I -p password to produce her parameter file
ntpkey_IFFpar_alice.filestamp, which includes both server and client keys. Copy this file
to all group hosts that operate as both servers and clients and install a soft link from the
generic ntpkey_iff_alice to this file. If there are no hosts restricted to operate only as
clients, there is nothing further to do. As the IFF scheme is independent of keys and
certificates, these files can be refreshed as needed.

If a rogue client has the parameter file, it could masquerade as a legitimate server and
present a middleman threat. To eliminate this threat, the client keys can be extracted from
the parameter file and distributed to all restricted clients. After generating the
parameter file, on alice run ntp-keygen -e and pipe the output to a file or mail program.
Copy or mail this file to all restricted clients. On these clients install a soft link from
the generic ntpkey_iff_alice to this file. To further protect the integrity of the keys,
each file can be encrypted with a secret password.

For the GQ scheme proceed as in the TC scheme to generate keys and certificates for all
group hosts, then for every trusted host in the group, generate the IFF parameter file. On
trusted host alice run ntp-keygen -T -G -p password to produce her parameter file
ntpkey_GQpar_alice.filestamp, which includes both server and client keys. Copy this file to
all group hosts and install a soft link from the generic ntpkey_gq_alice to this file. In
addition, on each host bob install a soft link from generic ntpkey_gq_bob to this file. As
the GQ scheme updates the GQ parameters file and certificate at the same time, keys and
certificates can be regenerated as needed.

For the MV scheme, proceed as in the TC scheme to generate keys and certificates for all
group hosts. For illustration assume trish is the TA, alice one of several trusted hosts
and bob one of her clients. On TA trish run ntp-keygen -V n -p password, where n is the
number of revokable keys (typically 5) to produce the parameter file
ntpkeys_MVpar_trish.filestamp and client key files ntpkeys_MVkeyd_trish.filestamp where d is
the key number (0 < d < n). Copy the parameter file to alice and install a soft link from
the generic ntpkey_mv_alice to this file. Copy one of the client key files to alice for
later distribution to her clients. It doesn't matter which client key file goes to alice,
since they all work the same way. Alice copies the client key file to all of her cliens.
On client bob install a soft link from generic ntpkey_mvkey_bob to the client key file. As
the MV scheme is independent of keys and certificates, these files can be refreshed as
needed.

Command Line Options
-c scheme
Select certificate message digest/signature encryption scheme. The scheme can be
one of the following: RSA-MD2, RSA-MD5, RSA-SHA, RSA-SHA1, RSA-MDC2, RSA-RIPEMD160,
DSA-SHA, or DSA-SHA1. Note that RSA schemes must be used with a RSA sign key and
DSA schemes must be used with a DSA sign key. The default without this option is
RSA-MD5.

-d Enable debugging. This option displays the cryptographic data produced in
eye-friendly billboards.

-e Write the IFF client keys to the standard output. This is intended for automatic
key distribution by mail.

-G Generate parameters and keys for the GQ identification scheme, obsoleting any that
may exist.

-g Generate keys for the GQ identification scheme using the existing GQ parameters. If
the GQ parameters do not yet exist, create them first.

-H Generate new host keys, obsoleting any that may exist.

-I Generate parameters for the IFF identification scheme, obsoleting any that may
exist.

-i name
Set the suject name to name. This is used as the subject field in certificates and
in the file name for host and sign keys.

-M Generate MD5 keys, obsoleting any that may exist.

-P Generate a private certificate. By default, the program generates public
certificates.

-p password
Encrypt generated files containing private data with password and the DES-CBC
algorithm.

-q Set the password for reading files to password.

-S [RSA | DSA]
Generate a new sign key of the designated type, obsoleting any that may exist. By
default, the program uses the host key as the sign key.

-s name
Set the issuer name to name. This is used for the issuer field in certificates and
in the file name for identity files.

-T Generate a trusted certificate. By default, the program generates a non-trusted
certificate.

-V nkeys
Generate parameters and keys for the Mu-Varadharajan (MV) identification scheme.

Random Seed File
All cryptographically sound key generation schemes must have means to randomize the entropy
seed used to initialize the internal pseudo-random number generator used by the library
routines. The OpenSSL library uses a designated random seed file for this purpose. The
file must be available when starting the NTP daemon and ntp-keygen program. If a site
supports OpenSSL or its companion OpenSSH, it is very likely that means to do this are
already available.

It is important to understand that entropy must be evolved for each generation, for
otherwise the random number sequence would be predictable. Various means dependent on
external events, such as keystroke intervals, can be used to do this and some systems have
built-in entropy sources. Suitable means are described in the OpenSSL software
documentation, but are outside the scope of this page.

The entropy seed used by the OpenSSL library is contained in a file, usually called .rnd,
which must be available when starting the NTP daemon or the ntp-keygen program. The NTP
daemon will first look for the file using the path specified by the randfile subcommand of
the crypto configuration command. If not specified in this way, or when starting the
ntp-keygen program, the OpenSSL library will look for the file using the path specified by
the RANDFILE environment variable in the user home directory, whether root or some other
user. If the RANDFILE environment variable is not present, the library will look for the
.rnd file in the user home directory. If the file is not available or cannot be written,
the daemon exits with a message to the system log and the program exits with a suitable
error message.

Cryptographic Data Files
All other file formats begin with two lines. The first contains the file name, including
the generated host name and filestamp. The second contains the datestamp in conventional
Unix date format. Lines beginning with # are considered comments and ignored by the
ntp-keygen program and ntpd(8) daemon. Cryptographic values are encoded first using ASN.1
rules, then encrypted if necessary, and finally written PEM-encoded printable ASCII format
preceded and followed by MIME content identifier lines.

The format of the symmetric keys file is somewhat different than the other files in the
interest of backward compatibility. Since DES-CBC is deprecated in NTPv4, the only key
format of interest is MD5 alphanumeric strings. Following hte heard the keys are entered
one per line in the format
keyno type key
where keyno is a positive integer in the range 1-65,535, type is the string MD5 defining the
key format and key is the key itself, which is a printable ASCII string 16 characters or
less in length. Each character is chosen from the 93 printable characters in the range 0x21
through 0x7f excluding space and the ‘#’ character.

Note that the keys used by the ntpq(1) and ntpdc(1) programs are checked against passwords
requested by the programs and entered by hand, so it is generally appropriate to specify
these keys in human readable ASCII format.

The ntp-keygen program generates a MD5 symmetric keys file ntpkey_MD5key_hostname.filestamp.
Since the file contains private shared keys, it should be visible only to root and
distributed by secure means to other subnet hosts. The NTP daemon loads the file ntp.keys,
so ntp-keygen installs a soft link from this name to the generated file. Subsequently,
similar soft links must be installed by manual or automated means on the other subnet hosts.
While this file is not used with the Autokey Version 2 protocol, it is needed to
authenticate some remote configuration commands used by the ntpq(1) and ntpdc(1) utilities.

OPTIONS

-b imbits, --imbits=imbits
identity modulus bits. This option takes an integer number as its argument. The
value of imbits is constrained to being:
in the range 256 through 2048

The number of bits in the identity modulus. The default is 256.

-c scheme, --certificate=scheme
certificate scheme.

scheme is one of RSA-MD2, RSA-MD5, RSA-SHA, RSA-SHA1, RSA-MDC2, RSA-RIPEMD160,
DSA-SHA, or DSA-SHA1.

Select the certificate message digest/signature encryption scheme. Note that RSA
schemes must be used with a RSA sign key and DSA schemes must be used with a DSA
sign key. The default without this option is RSA-MD5.

-C cipher, --cipher=cipher
privatekey cipher.

Select the cipher which is used to encrypt the files containing private keys. The
default is three-key triple DES in CBC mode, equivalent to "@code{-C des-ede3-cbc".
The openssl tool lists ciphers available in "openssl -h" output.

-d, --debug-level
Increase debug verbosity level. This option may appear an unlimited number of
times.

-D number, --set-debug-level=number
Set the debug verbosity level. This option may appear an unlimited number of times.
This option takes an integer number as its argument.

-e, --id-key
Write IFF or GQ identity keys.

Write the IFF or GQ client keys to the standard output. This is intended for
automatic key distribution by mail.

-G, --gq-params
Generate GQ parameters and keys.

Generate parameters and keys for the GQ identification scheme, obsoleting any that
may exist.

-H, --host-key
generate RSA host key.

Generate new host keys, obsoleting any that may exist.

-I, --iffkey
generate IFF parameters.

Generate parameters for the IFF identification scheme, obsoleting any that may
exist.

-i group, --ident=group
set Autokey group name.

Set the optional Autokey group name to name. This is used in the file name of IFF,
GQ, and MV client parameters files. In that role, the default is the host name if
this option is not provided. The group name, if specified using -i/--ident or using
-s/--subject-name following an '@' character, is also a part of the self-signed host
certificate's subject and issuer names in the form host@group and should match the
´crypto ident' or 'server ident' configuration in ntpd's configuration file.

-l lifetime, --lifetime=lifetime
set certificate lifetime. This option takes an integer number as its argument.

Set the certificate expiration to lifetime days from now.

-M, --md5key
generate MD5 keys.

Generate MD5 keys, obsoleting any that may exist.

-m modulus, --modulus=modulus
modulus. This option takes an integer number as its argument. The value of modulus
is constrained to being:
in the range 256 through 2048

The number of bits in the prime modulus. The default is 512.

-P, --pvt-cert
generate PC private certificate.

Generate a private certificate. By default, the program generates public
certificates.

-p passwd, --password=passwd
local private password.

Local files containing private data are encrypted with the DES-CBC algorithm and the
specified password. The same password must be specified to the local ntpd via the
"crypto pw password" configuration command. The default password is the local
hostname.

-q passwd, --export-passwd=passwd
export IFF or GQ group keys with password.

Export IFF or GQ identity group keys to the standard output, encrypted with the
DES-CBC algorithm and the specified password. The same password must be specified
to the remote ntpd via the "crypto pw password" configuration command. See also the
option --id-key (-e) for unencrypted exports.

-S sign, --sign-key=sign
generate sign key (RSA or DSA).

Generate a new sign key of the designated type, obsoleting any that may exist. By
default, the program uses the host key as the sign key.

-s host@group, --subject-name=host@group
set host and optionally group name.

Set the Autokey host name, and optionally, group name specified following an '@'
character. The host name is used in the file name of generated host and signing
certificates, without the group name. The host name, and if provided, group name
are used in host@group form for the host certificate's subject and issuer fields.
Specifying '-s @group' is allowed, and results in leaving the host name unchanged
while appending @group to the subject and issuer fields, as with -i group. The
group name, or if not provided, the host name are also used in the file names of
IFF, GQ, and MV client parameter files.

-T, --trusted-cert
trusted certificate (TC scheme).

Generate a trusted certificate. By default, the program generates a non-trusted
certificate.

-V num, --mv-params=num
generate <num> MV parameters. This option takes an integer number as its argument.

Generate parameters and keys for the Mu-Varadharajan (MV) identification scheme.

-v num, --mv-keys=num
update <num> MV keys. This option takes an integer number as its argument.

This option has not been fully documented.

-?, --help
Display usage information and exit.

-!, --more-help
Pass the extended usage information through a pager.

-> [cfgfile], --save-opts [=cfgfile]
Save the option state to cfgfile. The default is the last configuration file listed
in the OPTION PRESETS section, below. The command will exit after updating the
config file.

-< cfgfile, --load-opts=cfgfile, --no-load-opts
Load options from cfgfile. The no-load-opts form will disable the loading of
earlier config/rc/ini files. --no-load-opts is handled early, out of order.

--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
     configuration ("RC" or ".INI") file(s) and values from environment variables named:
       NTP_KEYGEN_<option-name> or NTP_KEYGEN
     The  environmental  presets  take  precedence  (are  processed later than) the configuration
     files.  The homerc files are "$HOME", and ".".  If any of these are  directories,  then  the
     file .ntprc is searched for within those directories.

USAGE

     The -p password option specifies the write password and -q password option the read password
     for previously encrypted files.  The ntp-keygen program prompts for the password if it reads
     an encrypted file and the password is missing or incorrect.  If an encrypted file is read
     successfully and no write password is specified, the read password is used as the write
     password by default.

ENVIRONMENT

     See OPTION PRESETS for configuration environment variables.

FILES

     See OPTION PRESETS for configuration files.

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.

     66  (EX_NOINPUT)
             A specified configuration file could not be loaded.

     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 and Network Time Foundation

COPYRIGHT

     Copyright (C) 1992-2017 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>.

BUGS

     It can take quite a while to generate some cryptographic values, from one to several minutes
     with modern architectures such as UltraSPARC and up to tens of minutes to an hour with older
     architectures such as SPARC IPC.

     Please report bugs to http://bugs.ntp.org .

     Please send bug reports to: http://bugs.ntp.org, bugs@ntp.org

NOTES

     Portions of this document came from FreeBSD.

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