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<refentry xmlns:db="http://docbook.org/ns/docbook" version="5.0" xml:id="man.nsec3hash">
  <info>
    <date>2009-03-02</date>
  </info>
  <refentryinfo>
    <corpname>ISC</corpname>
    <corpauthor>Internet Systems Consortium, Inc.</corpauthor>
  </refentryinfo>

  <refmeta>
    <refentrytitle><application>nsec3hash</application></refentrytitle>
    <manvolnum>8</manvolnum>
    <refmiscinfo>BIND9</refmiscinfo>
  </refmeta>

  <refnamediv>
    <refname><application>nsec3hash</application></refname>
    <refpurpose>generate NSEC3 hash</refpurpose>
  </refnamediv>

  <docinfo>
    <copyright>
      <year>2009</year>
      <year>2014</year>
      <year>2015</year>
      <year>2016</year>
      <year>2017</year>
      <year>2018</year>
      <holder>Internet Systems Consortium, Inc. ("ISC")</holder>
    </copyright>
  </docinfo>

  <refsynopsisdiv>
    <cmdsynopsis sepchar=" ">
      <command>nsec3hash</command>
      <arg choice="req" rep="norepeat"><replaceable class="parameter">salt</replaceable></arg>
      <arg choice="req" rep="norepeat"><replaceable class="parameter">algorithm</replaceable></arg>
      <arg choice="req" rep="norepeat"><replaceable class="parameter">iterations</replaceable></arg>
      <arg choice="req" rep="norepeat"><replaceable class="parameter">domain</replaceable></arg>
    </cmdsynopsis>
    <cmdsynopsis sepchar=" ">
      <command>nsec3hash -r</command>
      <arg choice="req" rep="norepeat"><replaceable class="parameter">algorithm</replaceable></arg>
      <arg choice="req" rep="norepeat"><replaceable class="parameter">flags</replaceable></arg>
      <arg choice="req" rep="norepeat"><replaceable class="parameter">iterations</replaceable></arg>
      <arg choice="req" rep="norepeat"><replaceable class="parameter">salt</replaceable></arg>
      <arg choice="req" rep="norepeat"><replaceable class="parameter">domain</replaceable></arg>
    </cmdsynopsis>
  </refsynopsisdiv>

  <refsection><info><title>DESCRIPTION</title></info>

    <para>
      <command>nsec3hash</command> generates an NSEC3 hash based on
      a set of NSEC3 parameters.  This can be used to check the validity
      of NSEC3 records in a signed zone.
    </para>

    <para>
      If this command is invoked as <command>nsec3hash -r</command>,
      it takes arguments in an order matching the first four fields
      of an NSEC3 record, followed by the domain name: algorithm, flags,
      iterations, salt, domain.  This makes it convenient to copy and
      paste a portion of an NSEC3 or NSEC3PARAM record into a command
      line to confirm the correctness of an NSEC3 hash.
    </para>

  </refsection>

  <refsection><info><title>ARGUMENTS</title></info>

    <variablelist>
      <varlistentry>
        <term>salt</term>
        <listitem>
          <para>
            The salt provided to the hash algorithm.
          </para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>algorithm</term>
        <listitem>
          <para>
            A number indicating the hash algorithm.  Currently the
            only supported hash algorithm for NSEC3 is SHA-1, which is
            indicated by the number 1; consequently "1" is the only
            useful value for this argument.
          </para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>flags</term>
        <listitem>
          <para>
            Provided for compatibility with NSEC3 record presentation
            format, but ignored since the flags do not affect the hash.
          </para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>iterations</term>
        <listitem>
          <para>
            The number of additional times the hash should be performed.
          </para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term>domain</term>
        <listitem>
          <para>
            The domain name to be hashed.
          </para>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsection>

  <refsection><info><title>SEE ALSO</title></info>

    <para>
      <citetitle>BIND 9 Administrator Reference Manual</citetitle>,
      <citetitle>RFC 5155</citetitle>.
    </para>
  </refsection>

</refentry>
