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<div class="refentry" lang="en">
<a name="man.dnssec-dsfromkey"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2>Name</h2>
<p><span class="application">dnssec-dsfromkey</span> &#8212; DNSSEC DS RR generation tool</p>
</div>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
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<div class="cmdsynopsis"><p><code class="command">dnssec-dsfromkey</code> [<code class="option">-v <em class="replaceable"><code>level</code></em></code>] [<code class="option">-1</code>] [<code class="option">-2</code>] [<code class="option">-a <em class="replaceable"><code>alg</code></em></code>] [<code class="option">-l <em class="replaceable"><code>domain</code></em></code>] [<code class="option">-T <em class="replaceable"><code>TTL</code></em></code>] {keyfile}</p></div>
<div class="cmdsynopsis"><p><code class="command">dnssec-dsfromkey</code> {-s} [<code class="option">-1</code>] [<code class="option">-2</code>] [<code class="option">-a <em class="replaceable"><code>alg</code></em></code>] [<code class="option">-K <em class="replaceable"><code>directory</code></em></code>] [<code class="option">-l <em class="replaceable"><code>domain</code></em></code>] [<code class="option">-s</code>] [<code class="option">-c <em class="replaceable"><code>class</code></em></code>] [<code class="option">-T <em class="replaceable"><code>TTL</code></em></code>] [<code class="option">-f <em class="replaceable"><code>file</code></em></code>] [<code class="option">-A</code>] [<code class="option">-v <em class="replaceable"><code>level</code></em></code>] {dnsname}</p></div>
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<div class="cmdsynopsis"><p><code class="command">dnssec-dsfromkey</code> [<code class="option">-h</code>] [<code class="option">-V</code>]</p></div>
</div>
<div class="refsect1" lang="en">
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<a name="id2619786"></a><h2>DESCRIPTION</h2>
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<p><span><strong class="command">dnssec-dsfromkey</strong></span>
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outputs the Delegation Signer (DS) resource record (RR), as defined in
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RFC 3658 and RFC 4509, for the given key(s).
</p>
</div>
<div class="refsect1" lang="en">
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<a name="id2619800"></a><h2>OPTIONS</h2>
<div class="variablelist"><dl>
<dt><span class="term">-1</span></dt>
<dd><p>
Use SHA-1 as the digest algorithm (the default is to use
both SHA-1 and SHA-256).
</p></dd>
<dt><span class="term">-2</span></dt>
<dd><p>
Use SHA-256 as the digest algorithm.
</p></dd>
<dt><span class="term">-a <em class="replaceable"><code>algorithm</code></em></span></dt>
<dd><p>
Select the digest algorithm. The value of
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<code class="option">algorithm</code> must be one of SHA-1 (SHA1),
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SHA-256 (SHA256), GOST or SHA-384 (SHA384).
These values are case insensitive.
</p></dd>
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<dt><span class="term">-T <em class="replaceable"><code>TTL</code></em></span></dt>
<dd><p>
Specifies the TTL of the DS records.
</p></dd>
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<dt><span class="term">-K <em class="replaceable"><code>directory</code></em></span></dt>
<dd><p>
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Look for key files (or, in keyset mode,
<code class="filename">keyset-</code> files) in
<code class="option">directory</code>.
</p></dd>
<dt><span class="term">-f <em class="replaceable"><code>file</code></em></span></dt>
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<dd>
<p>
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Zone file mode: in place of the keyfile name, the argument is
the DNS domain name of a zone master file, which can be read
from <code class="option">file</code>. If the zone name is the same as
<code class="option">file</code>, then it may be omitted.
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</p>
<p>
If <code class="option">file</code> is set to <code class="literal">"-"</code>, then
the zone data is read from the standard input. This makes it
possible to use the output of the <span><strong class="command">dig</strong></span>
command as input, as in:
</p>
<p>
<strong class="userinput"><code>dig dnskey example.com | dnssec-dsfromkey -f - example.com</code></strong>
</p>
</dd>
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<dt><span class="term">-A</span></dt>
<dd><p>
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Include ZSKs when generating DS records. Without this option,
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only keys which have the KSK flag set will be converted to DS
records and printed. Useful only in zone file mode.
</p></dd>
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<dt><span class="term">-l <em class="replaceable"><code>domain</code></em></span></dt>
<dd><p>
Generate a DLV set instead of a DS set. The specified
<code class="option">domain</code> is appended to the name for each
record in the set.
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The DNSSEC Lookaside Validation (DLV) RR is described
in RFC 4431.
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</p></dd>
<dt><span class="term">-s</span></dt>
<dd><p>
Keyset mode: in place of the keyfile name, the argument is
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the DNS domain name of a keyset file.
</p></dd>
<dt><span class="term">-c <em class="replaceable"><code>class</code></em></span></dt>
<dd><p>
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Specifies the DNS class (default is IN). Useful only
in keyset or zone file mode.
</p></dd>
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<dt><span class="term">-v <em class="replaceable"><code>level</code></em></span></dt>
<dd><p>
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Sets the debugging level.
</p></dd>
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<dt><span class="term">-h</span></dt>
<dd><p>
Prints usage information.
</p></dd>
<dt><span class="term">-V</span></dt>
<dd><p>
Prints version information.
</p></dd>
</dl></div>
</div>
<div class="refsect1" lang="en">
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<a name="id2620199"></a><h2>EXAMPLE</h2>
<p>
To build the SHA-256 DS RR from the
<strong class="userinput"><code>Kexample.com.+003+26160</code></strong>
keyfile name, the following command would be issued:
</p>
<p><strong class="userinput"><code>dnssec-dsfromkey -2 Kexample.com.+003+26160</code></strong>
</p>
<p>
The command would print something like:
</p>
<p><strong class="userinput"><code>example.com. IN DS 26160 5 2 3A1EADA7A74B8D0BA86726B0C227AA85AB8BBD2B2004F41A868A54F0 C5EA0B94</code></strong>
</p>
</div>
<div class="refsect1" lang="en">
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<a name="id2620235"></a><h2>FILES</h2>
<p>
The keyfile can be designed by the key identification
<code class="filename">Knnnn.+aaa+iiiii</code> or the full file name
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<code class="filename">Knnnn.+aaa+iiiii.key</code> as generated by
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<span class="refentrytitle">dnssec-keygen</span>(8).
</p>
<p>
The keyset file name is built from the <code class="option">directory</code>,
the string <code class="filename">keyset-</code> and the
<code class="option">dnsname</code>.
</p>
</div>
<div class="refsect1" lang="en">
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<a name="id2620277"></a><h2>CAVEAT</h2>
<p>
A keyfile error can give a "file not found" even if the file exists.
</p>
</div>
<div class="refsect1" lang="en">
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<a name="id2621310"></a><h2>SEE ALSO</h2>
<p><span class="citerefentry"><span class="refentrytitle">dnssec-keygen</span>(8)</span>,
<span class="citerefentry"><span class="refentrytitle">dnssec-signzone</span>(8)</span>,
<em class="citetitle">BIND 9 Administrator Reference Manual</em>,
<em class="citetitle">RFC 3658</em>,
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<em class="citetitle">RFC 4431</em>.
<em class="citetitle">RFC 4509</em>.
</p>
</div>
<div class="refsect1" lang="en">
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<a name="id2621350"></a><h2>AUTHOR</h2>
<p><span class="corpauthor">Internet Systems Consortium</span>
</p>
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