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<title>dnssec-keygen</title>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en">
<div class="refnamediv">
<h2>Name</h2>
<p><span class="application">dnssec-keygen</span> — DNSSEC key generation tool</p>
</div>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="cmdsynopsis"><p><code class="command">dnssec-keygen</code> [<code class="option">-a <em class="replaceable"><code>algorithm</code></em></code>] [<code class="option">-b <em class="replaceable"><code>keysize</code></em></code>] [<code class="option">-n <em class="replaceable"><code>nametype</code></em></code>] [<code class="option">-3</code>] [<code class="option">-A <em class="replaceable"><code>date/offset</code></em></code>] [<code class="option">-C</code>] [<code class="option">-c <em class="replaceable"><code>class</code></em></code>] [<code class="option">-D <em class="replaceable"><code>date/offset</code></em></code>] [<code class="option">-e</code>] [<code class="option">-f <em class="replaceable"><code>flag</code></em></code>] [<code class="option">-g <em class="replaceable"><code>generator</code></em></code>] [<code class="option">-h</code>] [<code class="option">-K <em class="replaceable"><code>directory</code></em></code>] [<code class="option">-k</code>] [<code class="option">-P <em class="replaceable"><code>date/offset</code></em></code>] [<code class="option">-p <em class="replaceable"><code>protocol</code></em></code>] [<code class="option">-R <em class="replaceable"><code>date/offset</code></em></code>] [<code class="option">-r <em class="replaceable"><code>randomdev</code></em></code>] [<code class="option">-s <em class="replaceable"><code>strength</code></em></code>] [<code class="option">-t <em class="replaceable"><code>type</code></em></code>] [<code class="option">-U <em class="replaceable"><code>date/offset</code></em></code>] [<code class="option">-v <em class="replaceable"><code>level</code></em></code>] [<code class="option">-z</code>] {name}</p></div>
</div>
<div class="refsect1" lang="en">
<a name="id2543541"></a><h2>DESCRIPTION</h2>
<p><span><strong class="command">dnssec-keygen</strong></span>
generates keys for DNSSEC (Secure DNS), as defined in RFC 2535
and RFC 4034. It can also generate keys for use with
TSIG (Transaction Signatures) as defined in RFC 2845, or TKEY
(Transaction Key) as defined in RFC 2930.
</p>
<p>
The <code class="option">name</code> of the key is specified on the command
line. For DNSSEC keys, this must match the name of the zone for
which the key is being generated.
</p>
</div>
<div class="refsect1" lang="en">
<a name="id2543559"></a><h2>OPTIONS</h2>
<div class="variablelist"><dl>
<dt><span class="term">-a <em class="replaceable"><code>algorithm</code></em></span></dt>
<dd>
<p>
Selects the cryptographic algorithm. For DNSSEC keys, the value
of <code class="option">algorithm</code> must be one of RSAMD5, RSASHA1,
be DH (Diffie Hellman), HMAC-MD5, HMAC-SHA1, HMAC-SHA224,
HMAC-SHA256, HMAC-SHA384, or HMAC-SHA512. These values are
case insensitive.
</p>
<p>
If no algorithm is specified, then RSASHA1 will be used by
default, unless the <code class="option">-3</code> option is specified,
in which case NSEC3RSASHA1 will be used instead.
</p>
<p>
Note 1: that for DNSSEC, RSASHA1 is a mandatory to implement
algorithm, and DSA is recommended. For TSIG, HMAC-MD5 is
mandatory.
</p>
<p>
Note 2: DH, HMAC-MD5, and HMAC-SHA1 through HMAC-SHA512
automatically set the -T KEY option.
</p>
</dd>
<dt><span class="term">-b <em class="replaceable"><code>keysize</code></em></span></dt>
<dd>
<p>
Specifies the number of bits in the key. The choice of key
size depends on the algorithm used. RSAMD5 / RSASHA1 keys must be
between 512 and 2048 bits. Diffie Hellman keys must be between
128 and 4096 bits. DSA keys must be between 512 and 1024
bits and an exact multiple of 64. HMAC-MD5 keys must be
between 1 and 512 bits.
</p>
<p>
The key size does not need to be specified if using a default
algorithm. The default key size is 1024 bits for zone signing
keys (ZSK's) and 2048 bits for key signing keys (KSK's,
generated with <code class="option">-f KSK</code>). However, if an
algorithm is explicitly specified with the <code class="option">-a</code>,
then there is no default key size, and the <code class="option">-b</code>
must be used.
</p>
</dd>
<dt><span class="term">-n <em class="replaceable"><code>nametype</code></em></span></dt>
<dd><p>
Specifies the owner type of the key. The value of
<code class="option">nametype</code> must either be ZONE (for a DNSSEC
a host (KEY)),
USER (for a key associated with a user(KEY)) or OTHER (DNSKEY).
These values are case insensitive. Defaults to ZONE for DNSKEY
generation.
</p></dd>
<dt><span class="term">-3</span></dt>
<dd><p>
Use an NSEC3-capable algorithm to generate a DNSSEC key.
If this option is used and no algorithm is explicitly
set on the command line, NSEC3RSASHA1 will be used by
default.
</p></dd>
<dt><span class="term">-C</span></dt>
<dd><p>
Compatibility mode: generates an old-style key, without
any metadata. By default, <span><strong class="command">dnssec-keygen</strong></span>
will include the key's creation date in the metadata stored
with the private key, and other dates may be set there as well
(publication date, activation date, etc). Keys that include
this data may be incompatible with older versions of BIND; the
<code class="option">-C</code> option suppresses them.
</p></dd>
<dt><span class="term">-c <em class="replaceable"><code>class</code></em></span></dt>
<dd><p>
Indicates that the DNS record containing the key should have
the specified class. If not specified, class IN is used.
</p></dd>
<dt><span class="term">-e</span></dt>
<dd><p>
</p></dd>
<dt><span class="term">-f <em class="replaceable"><code>flag</code></em></span></dt>
<dd><p>
The only recognized flags are KSK (Key Signing Key) and REVOKE.
</p></dd>
<dt><span class="term">-g <em class="replaceable"><code>generator</code></em></span></dt>
<dd><p>
If generating a Diffie Hellman key, use this generator.
Allowed values are 2 and 5. If no generator
is specified, a known prime from RFC 2539 will be used
if possible; otherwise the default is 2.
</p></dd>
<dt><span class="term">-h</span></dt>
<dd><p>
Prints a short summary of the options and arguments to
<span><strong class="command">dnssec-keygen</strong></span>.
</p></dd>
<dt><span class="term">-K <em class="replaceable"><code>directory</code></em></span></dt>
<dd><p>
Sets the directory in which the key files are to be written.
</p></dd>
<dt><span class="term">-k</span></dt>
<dd><p>
Deprecated in favor of -T KEY.
</p></dd>
<dt><span class="term">-p <em class="replaceable"><code>protocol</code></em></span></dt>
<dd><p>
Sets the protocol value for the generated key. The protocol
is a number between 0 and 255. The default is 3 (DNSSEC).
Other possible values for this argument are listed in
RFC 2535 and its successors.
</p></dd>
<dt><span class="term">-r <em class="replaceable"><code>randomdev</code></em></span></dt>
<dd><p>
Specifies the source of randomness. If the operating
or equivalent device, the default source of randomness
is keyboard input. <code class="filename">randomdev</code>
specifies
the name of a character device or file containing random
data to be used instead of the default. The special value
<code class="filename">keyboard</code> indicates that keyboard
input should be used.
</p></dd>
<dt><span class="term">-s <em class="replaceable"><code>strength</code></em></span></dt>
<dd><p>
Specifies the strength value of the key. The strength is
a number between 0 and 15, and currently has no defined
purpose in DNSSEC.
</p></dd>
<dt><span class="term">-T <em class="replaceable"><code>rrtype</code></em></span></dt>
<dd>
<p>
Specifies the resource record type to use for the key.
<code class="option">rrtype</code> must be either DNSKEY or KEY. The
default is DNSKEY when using a DNSSEC algorithm, but it can be
overridden to KEY for use with SIG(0).
</p>
<p>
</p>
<p>
Using any TSIG algorithm (HMAC-* or DH) forces this option
to KEY.
</p>
</dd>
<dt><span class="term">-t <em class="replaceable"><code>type</code></em></span></dt>
<dd><p>
Indicates the use of the key. <code class="option">type</code> must be
one of AUTHCONF, NOAUTHCONF, NOAUTH, or NOCONF. The default
is AUTHCONF. AUTH refers to the ability to authenticate
data, and CONF the ability to encrypt data.
</p></dd>
<dt><span class="term">-v <em class="replaceable"><code>level</code></em></span></dt>
<dd><p>
Sets the debugging level.
</p></dd>
</dl></div>
</div>
<div class="refsect1" lang="en">
<a name="id2544058"></a><h2>TIMING OPTIONS</h2>
<p>
Dates can be expressed in the format YYYYMMDD or YYYYMMDDHHMMSS.
If the argument begins with a '+' or '-', it is interpreted as
an offset from the present time. For convenience, if such an offset
is followed by one of the suffixes 'y', 'mo', 'w', 'd', 'h', or 'mi',
then the offset is computed in years (defined as 365 24-hour days,
ignoring leap years), months (defined as 30 24-hour days), weeks,
days, hours, or minutes, respectively. Without a suffix, the offset
is computed in seconds.
</p>
<div class="variablelist"><dl>
<dd><p>
Sets the date on which a key is to be published to the zone.
After that date, the key will be included in the zone but will
not be used to sign it.
</p></dd>
<dd><p>
Sets the date on which the key is to be activated. After that
date, the key will be included and the zone and used to sign
it.
</p></dd>
<dd><p>
Sets the date on which the key is to be revoked. After that
date, the key will be flagged as revoked. It will be included
in the zone and will be used to sign it.
</p></dd>
<dd><p>
Sets the date on which the key is to be unpublished. After that
date, the key will no longer be included in the zone, but it
may remain in the key repository.
</p></dd>
<dd><p>
Sets the date on which the key is to be deleted. After that
date, the key can be removed from the key repository.
NOTE: Keys are not currently deleted automatically; this field
is included for informational purposes and for future
development.
</p></dd>
</dl></div>
</div>
<div class="refsect1" lang="en">
<a name="id2544156"></a><h2>GENERATED KEYS</h2>
<p>
When <span><strong class="command">dnssec-keygen</strong></span> completes
successfully,
it prints a string of the form <code class="filename">Knnnn.+aaa+iiiii</code>
to the standard output. This is an identification string for
the key it has generated.
</p>
<div class="itemizedlist"><ul type="disc">
<li><p><code class="filename">nnnn</code> is the key name.
</p></li>
<li><p><code class="filename">aaa</code> is the numeric representation
of the
algorithm.
</p></li>
<li><p><code class="filename">iiiii</code> is the key identifier (or
footprint).
</p></li>
</ul></div>
<p><span><strong class="command">dnssec-keygen</strong></span>
creates two files, with names based
contains the public key, and
private
key.
</p>
<p>
The <code class="filename">.key</code> file contains a DNS KEY record
that
can be inserted into a zone file (directly or with a $INCLUDE
statement).
</p>
<p>
The <code class="filename">.private</code> file contains
algorithm-specific
fields. For obvious security reasons, this file does not have
general read permission.
</p>
<p>
Both <code class="filename">.key</code> and <code class="filename">.private</code>
files are generated for symmetric encryption algorithms such as
HMAC-MD5, even though the public and private key are equivalent.
</p>
</div>
<div class="refsect1" lang="en">
<a name="id2543078"></a><h2>EXAMPLE</h2>
<p>
To generate a 768-bit DSA key for the domain
issued:
</p>
</p>
<p>
The command would print a string of the form:
</p>
</p>
<p>
In this example, <span><strong class="command">dnssec-keygen</strong></span> creates
and
</p>
</div>
<div class="refsect1" lang="en">
<a name="id2543122"></a><h2>SEE ALSO</h2>
<p><span class="citerefentry"><span class="refentrytitle">dnssec-signzone</span>(8)</span>,
<em class="citetitle">BIND 9 Administrator Reference Manual</em>,
<em class="citetitle">RFC 2539</em>,
<em class="citetitle">RFC 2845</em>,
<em class="citetitle">RFC 4033</em>.
</p>
</div>
<div class="refsect1" lang="en">
<a name="id2543153"></a><h2>AUTHOR</h2>
<p><span class="corpauthor">Internet Systems Consortium</span>
</p>
</div>
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