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<title>dnssec-dsfromkey</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
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<link rel="home" href="Bv9ARM.html" title="BIND 9 Administrator Reference Manual">
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<tr><th colspan="3" align="center"><span class="application">dnssec-dsfromkey</span></th></tr>
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<tr>
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<td width="20%" align="left">
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<a accesskey="p" href="man.dnssec-coverage.html">Prev</a> </td>
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<div class="refentry">
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<a name="man.dnssec-dsfromkey"></a><div class="titlepage"></div>
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<div class="refnamediv">
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<h2>Name</h2>
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<p>
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<span class="application">dnssec-dsfromkey</span>
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— DNSSEC DS RR generation tool
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</p>
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</div>
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<div class="refsynopsisdiv">
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<h2>Synopsis</h2>
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<div class="cmdsynopsis"><p>
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<code class="command">dnssec-dsfromkey</code>
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[
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<code class="option">-1</code>
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| <code class="option">-2</code>
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| <code class="option">-a <em class="replaceable"><code>alg</code></em></code>
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]
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[
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<code class="option">-C</code>
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| <code class="option">-l <em class="replaceable"><code>domain</code></em></code>
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]
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[<code class="option">-T <em class="replaceable"><code>TTL</code></em></code>]
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[<code class="option">-v <em class="replaceable"><code>level</code></em></code>]
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[<code class="option">-K <em class="replaceable"><code>directory</code></em></code>]
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{keyfile}
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</p></div>
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<div class="cmdsynopsis"><p>
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<code class="command">dnssec-dsfromkey</code>
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[
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<code class="option">-1</code>
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| <code class="option">-2</code>
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| <code class="option">-a <em class="replaceable"><code>alg</code></em></code>
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]
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[
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<code class="option">-C</code>
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| <code class="option">-l <em class="replaceable"><code>domain</code></em></code>
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]
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[<code class="option">-T <em class="replaceable"><code>TTL</code></em></code>]
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[<code class="option">-v <em class="replaceable"><code>level</code></em></code>]
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[<code class="option">-c <em class="replaceable"><code>class</code></em></code>]
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[<code class="option">-A</code>]
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{<code class="option">-f <em class="replaceable"><code>file</code></em></code>}
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[dnsname]
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</p></div>
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<div class="cmdsynopsis"><p>
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<code class="command">dnssec-dsfromkey</code>
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[
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<code class="option">-1</code>
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| <code class="option">-2</code>
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| <code class="option">-a <em class="replaceable"><code>alg</code></em></code>
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]
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[
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<code class="option">-C</code>
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| <code class="option">-l <em class="replaceable"><code>domain</code></em></code>
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]
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[<code class="option">-T <em class="replaceable"><code>TTL</code></em></code>]
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[<code class="option">-v <em class="replaceable"><code>level</code></em></code>]
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[<code class="option">-c <em class="replaceable"><code>class</code></em></code>]
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[<code class="option">-K <em class="replaceable"><code>directory</code></em></code>]
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{-s}
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{dnsname}
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</p></div>
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<div class="cmdsynopsis"><p>
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<code class="command">dnssec-dsfromkey</code>
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[
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<code class="option">-h</code>
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| <code class="option">-V</code>
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]
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</p></div>
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</div>
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<div class="refsection">
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<a name="id-1.13.9.7"></a><h2>DESCRIPTION</h2>
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<p>
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The <span class="command"><strong>dnssec-dsfromkey</strong></span> command outputs DS (Delegation
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Signer) resource records (RRs), or CDS (Child DS) RRs with the
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<code class="option">-C</code> option.
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</p>
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<p>
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The input keys can be specified in a number of ways:
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</p>
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<p>
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By default, <span class="command"><strong>dnssec-dsfromkey</strong></span> reads a key file
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named like <code class="filename">Knnnn.+aaa+iiiii.key</code>, as generated
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by <span class="command"><strong>dnssec-keygen</strong></span>.
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</p>
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<p>
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With the <code class="option">-f <em class="replaceable"><code>file</code></em></code>
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option, <span class="command"><strong>dnssec-dsfromkey</strong></span> reads keys from a zone file
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or partial zone file (which can contain just the DNSKEY records).
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</p>
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<p>
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With the <code class="option">-s</code>
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option, <span class="command"><strong>dnssec-dsfromkey</strong></span> reads
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a <code class="filename">keyset-</code> file, as generated
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by <span class="command"><strong>dnssec-keygen</strong></span> <code class="option">-C</code>.
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</p>
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</div>
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<div class="refsection">
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<a name="id-1.13.9.8"></a><h2>OPTIONS</h2>
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<div class="variablelist"><dl class="variablelist">
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<dt><span class="term">-1</span></dt>
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<dd>
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<p>
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An abbreviation for <code class="option">-a SHA-1</code>.
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(Note: The SHA-1 algorithm is no longer recommended for use
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when generating new DS and CDS records.)
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</p>
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</dd>
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<dt><span class="term">-2</span></dt>
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<dd>
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<p>
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An abbreviation for <code class="option">-a SHA-256</code>.
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</p>
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</dd>
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<dt><span class="term">-a <em class="replaceable"><code>algorithm</code></em></span></dt>
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<dd>
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<p>
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Specify a digest algorithm to use when converting DNSKEY
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records to DS records. This option can be repeated, so
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that multiple DS records are created for each DNSKEY
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record.
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</p>
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<p>
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The <em class="replaceable"><code>algorithm</code></em> must be one of
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SHA-1, SHA-256, or SHA-384. These values are case insensitive,
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and the hyphen may be omitted. If no algorithm is specified,
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the default is SHA-256.
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(Note: The SHA-1 algorithm is no longer recommended for use
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when generating new DS and CDS records.)
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</p>
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</dd>
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<dt><span class="term">-A</span></dt>
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<dd>
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<p>
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Include ZSKs when generating DS records. Without this option, only
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keys which have the KSK flag set will be converted to DS records
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and printed. Useful only in <code class="option">-f</code> zone file mode.
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</p>
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</dd>
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<dt><span class="term">-c <em class="replaceable"><code>class</code></em></span></dt>
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<dd>
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<p>
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Specifies the DNS class (default is IN). Useful only
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in <code class="option">-s</code> keyset or <code class="option">-f</code>
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zone file mode.
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</p>
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</dd>
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<dt><span class="term">-C</span></dt>
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<dd>
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<p>
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Generate CDS records rather than DS records.
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</p>
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</dd>
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<dt><span class="term">-f <em class="replaceable"><code>file</code></em></span></dt>
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<dd>
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<p>
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Zone file mode: <span class="command"><strong>dnssec-dsfromkey</strong></span>'s
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final <em class="replaceable"><code>dnsname</code></em> argument is
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the DNS domain name of a zone whose master file can be read
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from <code class="option">file</code>. If the zone name is the same as
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<code class="option">file</code>, then it may be omitted.
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</p>
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<p>
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If <em class="replaceable"><code>file</code></em> is <code class="literal">"-"</code>, then
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the zone data is read from the standard input. This makes it
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possible to use the output of the <span class="command"><strong>dig</strong></span>
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command as input, as in:
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</p>
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<p>
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<strong class="userinput"><code>dig dnskey example.com | dnssec-dsfromkey -f - example.com</code></strong>
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</p>
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</dd>
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<dt><span class="term">-h</span></dt>
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<dd>
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<p>
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Prints usage information.
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</p>
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</dd>
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<dt><span class="term">-K <em class="replaceable"><code>directory</code></em></span></dt>
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<dd>
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<p>
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Look for key files or <code class="filename">keyset-</code> files in
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<code class="option">directory</code>.
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</p>
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</dd>
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<dt><span class="term">-s</span></dt>
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<dd>
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<p>
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Keyset mode: <span class="command"><strong>dnssec-dsfromkey</strong></span>'s
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final <em class="replaceable"><code>dnsname</code></em> argument is the DNS
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domain name used to locate a <code class="filename">keyset-</code> file.
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</p>
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</dd>
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<dt><span class="term">-T <em class="replaceable"><code>TTL</code></em></span></dt>
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<dd>
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<p>
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Specifies the TTL of the DS records. By default the TTL is omitted.
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</p>
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</dd>
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<dt><span class="term">-v <em class="replaceable"><code>level</code></em></span></dt>
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<dd>
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<p>
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Sets the debugging level.
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</p>
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</dd>
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<dt><span class="term">-V</span></dt>
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<dd>
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<p>
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Prints version information.
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</p>
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</dd>
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</dl></div>
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</div>
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<div class="refsection">
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<a name="id-1.13.9.9"></a><h2>EXAMPLE</h2>
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<p>
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To build the SHA-256 DS RR from the
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<strong class="userinput"><code>Kexample.com.+003+26160</code></strong>
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keyfile name, you can issue the following command:
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</p>
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<p><strong class="userinput"><code>dnssec-dsfromkey -2 Kexample.com.+003+26160</code></strong>
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</p>
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<p>
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The command would print something like:
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</p>
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<p><strong class="userinput"><code>example.com. IN DS 26160 5 2 3A1EADA7A74B8D0BA86726B0C227AA85AB8BBD2B2004F41A868A54F0C5EA0B94</code></strong>
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</p>
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</div>
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<div class="refsection">
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<a name="id-1.13.9.10"></a><h2>FILES</h2>
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<p>
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The keyfile can be designated by the key identification
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<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).
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</p>
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<p>
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The keyset file name is built from the <code class="option">directory</code>,
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the string <code class="filename">keyset-</code> and the
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<code class="option">dnsname</code>.
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</p>
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</div>
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<div class="refsection">
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<a name="id-1.13.9.11"></a><h2>CAVEAT</h2>
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<p>
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A keyfile error can give a "file not found" even if the file exists.
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</p>
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</div>
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<div class="refsection">
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<a name="id-1.13.9.12"></a><h2>SEE ALSO</h2>
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<p><span class="citerefentry">
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<span class="refentrytitle">dnssec-keygen</span>(8)
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</span>,
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<span class="citerefentry">
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<span class="refentrytitle">dnssec-signzone</span>(8)
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</span>,
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<em class="citetitle">BIND 9 Administrator Reference Manual</em>,
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<em class="citetitle">RFC 3658</em> (DS RRs),
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<em class="citetitle">RFC 4509</em> (SHA-256 for DS RRs),
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<em class="citetitle">RFC 6605</em> (SHA-384 for DS RRs),
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<em class="citetitle">RFC 7344</em> (CDS and CDNSKEY RRs).
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</p>
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</div>
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