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<refentry id="man.dnssec-dsfromkey">
<refentryinfo>
<date>November 29, 2008</date>
</refentryinfo>
<refmeta>
<refentrytitle><application>dnssec-dsfromkey</application></refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo>BIND9</refmiscinfo>
</refmeta>
<refnamediv>
<refname><application>dnssec-dsfromkey</application></refname>
<refpurpose>DNSSEC DS RR generation tool</refpurpose>
</refnamediv>
<docinfo>
<copyright>
<year>2008</year>
<year>2012</year>
<holder>Internet Systems Consortium, Inc. ("ISC")</holder>
</copyright>
</docinfo>
<refsynopsisdiv>
<cmdsynopsis>
<command>dnssec-dsfromkey</command>
<arg><option>-v <replaceable class="parameter">level</replaceable></option></arg>
<arg><option>-1</option></arg>
<arg><option>-2</option></arg>
<arg><option>-a <replaceable class="parameter">alg</replaceable></option></arg>
<arg choice="req">keyfile</arg>
</cmdsynopsis>
<cmdsynopsis>
<command>dnssec-dsfromkey</command>
<arg choice="req">-s</arg>
<arg><option>-v <replaceable class="parameter">level</replaceable></option></arg>
<arg><option>-1</option></arg>
<arg><option>-2</option></arg>
<arg><option>-a <replaceable class="parameter">alg</replaceable></option></arg>
<arg><option>-c <replaceable class="parameter">class</replaceable></option></arg>
<arg><option>-d <replaceable class="parameter">dir</replaceable></option></arg>
<arg choice="req">dnsname</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>DESCRIPTION</title>
<para><command>dnssec-dsfromkey</command>
outputs the Delegation Signer (DS) resource record (RR), as defined in
RFC 3658 and RFC 4509, for the given key(s).
</para>
</refsect1>
<refsect1>
<title>OPTIONS</title>
<variablelist>
<varlistentry>
<term>-1</term>
<listitem>
<para>
Use SHA-1 as the digest algorithm (the default is to use
both SHA-1 and SHA-256).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>-2</term>
<listitem>
<para>
Use SHA-256 as the digest algorithm.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>-a <replaceable class="parameter">algorithm</replaceable></term>
<listitem>
<para>
Select the digest algorithm. The value of
<option>algorithm</option> must be one of SHA-1 (SHA1) or
SHA-256 (SHA256). These values are case insensitive.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>-v <replaceable class="parameter">level</replaceable></term>
<listitem>
<para>
Sets the debugging level.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>-s</term>
<listitem>
<para>
Keyset mode: in place of the keyfile name, the argument is
the DNS domain name of a keyset file. Following options make sense
only in this mode.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>-c <replaceable class="parameter">class</replaceable></term>
<listitem>
<para>
Specifies the DNS class (default is IN), useful only
in the keyset mode.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>-d <replaceable class="parameter">directory</replaceable></term>
<listitem>
<para>
Look for <filename>keyset</filename> files in
<option>directory</option> as the directory, ignored when
not in the keyset mode.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>EXAMPLE</title>
<para>
To build the SHA-256 DS RR from the
keyfile name, the following command would be issued:
</para>
</para>
<para>
The command would print something like:
</para>
<para><userinput>example.com. IN DS 26160 5 2 3A1EADA7A74B8D0BA86726B0C227AA85AB8BBD2B2004F41A868A54F0 C5EA0B94</userinput>
</para>
</refsect1>
<refsect1>
<title>FILES</title>
<para>
The keyfile can be designed by the key identification
<filename>Knnnn.+aaa+iiiii</filename> or the full file name
<refentrytitle>dnssec-keygen</refentrytitle><manvolnum>8</manvolnum>.
</para>
<para>
The keyset file name is built from the <option>directory</option>,
the string <filename>keyset-</filename> and the
<option>dnsname</option>.
</para>
</refsect1>
<refsect1>
<title>CAVEAT</title>
<para>
A keyfile error can give a "file not found" even if the file exists.
</para>
</refsect1>
<refsect1>
<title>SEE ALSO</title>
<para><citerefentry>
<refentrytitle>dnssec-keygen</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>dnssec-signzone</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>,
<citetitle>BIND 9 Administrator Reference Manual</citetitle>,
<citetitle>RFC 3658</citetitle>,
<citetitle>RFC 4509</citetitle>.
</para>
</refsect1>
<refsect1>
<title>AUTHOR</title>
<para><corpauthor>Internet Systems Consortium</corpauthor>
</para>
</refsect1>
</refentry><!--
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