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<h2 id="signjar">SignJar</h2>
<h3>Description</h3>
<p>Signing a jar allows users to authenticate the publisher.</p>
<p>Signs JAR files with
the <a href="https://docs.oracle.com/javase/8/docs/technotes/tools/windows/jarsigner.html"
target="_top"><kbd>jarsigner</kbd></a> command line tool.  It will take a named file in
the <var>jar</var> attribute, and an optional <var>destDir</var> or <var>signedJar</var>
attribute. Nested paths are also supported; here only an (optional) <var>destDir</var> is
allowed. If a destination directory or explicit JAR file name is not provided, JARs are signed in
place.</p>
<p>Dependency rules</p>
<ul>
  <li>Nonexistent destination JARs are created/signed</li>
  <li>Out of date destination JARs are created/signed</li>
  <li>If a destination file and a source file are the same, and <var>lazy</var> is <q>true</q>, the
    JAR is only signed if it does not contain a signature by this alias.</li>
  <li>If a destination file and a source file are the same, and <var>lazy</var> is <q>false</q>, the
    JAR is signed.</li>
</ul>

<h3>Parameters</h3>
<table class="attr">
  <tr>
    <th scope="col">Attribute</th>
    <th scope="col">Description</th>
    <th scope="col">Required</th>
  </tr>
  <tr>
    <td>jar</td>
    <td>the jar file to sign</td>
    <td>Yes, unless nested paths have been used</td>
  </tr>
  <tr>
    <td>alias</td>
    <td>the alias to sign under</td>
    <td>Yes</td>
  </tr>
  <tr>
    <td>storepass</td>
    <td>password for keystore integrity. Ant will not use
    the <code>-storepass</code> command line argument but send the
    password to jarsigner when it prompts for it.</td>
    <td>Yes</td>
  </tr>
  <tr>
    <td>keystore</td>
    <td>keystore location</td>
    <td>No</td>
  </tr>
  <tr>
    <td>storetype</td>
    <td>keystore type</td>
    <td>No</td>
  </tr>
  <tr>
    <td>keypass</td>
    <td>password for private key (if different)</td>
    <td>No</td>
  </tr>
  <tr>
    <td>sigfile</td>
    <td>name of <samp>.SF</samp>/<samp>.DSA</samp> file</td>
    <td>No</td>
  </tr>
  <tr>
    <td>signedjar</td>
    <td>name of signed JAR file. This can only be set when the <var>jar</var> attribute is set.</td>
    <td>No</td>
  </tr>
  <tr>
    <td>verbose</td>
    <td>(<q>true|false</q>) verbose output when signing</td>
    <td>No; default <q>false</q></td>
  </tr>
  <tr>
    <td>strict</td>
    <td>(<q>true|false</q>) strict checking when signing.<br/><em>since Ant 1.9.1</em>.</td>
    <td>No; default <q>false</q></td>
  </tr>
  <tr>
    <td>internalsf</td>
    <td>(<q>true|false</q>) include the <samp>.SF</samp> file inside the signature block</td>
    <td>No; default <q>false</q></td>
  </tr>
  <tr>
    <td>sectionsonly</td>
    <td>(<q>true|false</q>) don't compute hash of entire manifest</td>
    <td>No; default <q>false</q></td>
  </tr>
  <tr>
    <td>lazy</td>
    <td>flag to control whether the presence of a signature file means a JAR is signed. This is only
      used when the target JAR matches the source JAR</td>
    <td>No; default <q>false</q></td>
  </tr>
  <tr>
    <td>maxmemory</td>
    <td>Specifies the maximum memory the <kbd>jarsigner</kbd> JVM will use. Specified in the style
      of standard Java memory specs (e.g. <q>128m</q> = 128 MBytes)</td>
    <td>No</td>
  </tr>
  <tr>
    <td>preservelastmodified</td>
    <td>Give the signed files the same last modified time as the original jar files.</td>
    <td>No; default <q>false</q>.</td>
  </tr>
  <tr>
    <td>tsaurl</td>
    <td>URL for a timestamp authority for timestamped JAR files in Java 5+</td>
    <td>No</td>
  </tr>
  <tr>
    <td>tsacert</td>
    <td>alias in the keystore for a timestamp authority for timestamped JAR files in Java 5+</td>
    <td>No</td>
  </tr>
  <tr>
    <td>tsaproxyhost</td>
    <td>proxy host to be used when connecting to TSA server</td>
    <td>No</td>
  </tr>
  <tr>
    <td>tsaproxyport</td>
    <td>proxy port to be used when connecting to TSA server</td>
    <td>No</td>
  </tr>
  <tr>
    <td>executable</td>
    <td>Specify a particular <kbd>jarsigner</kbd> executable to use in place of the default binary
      (found in the same JDK as Apache Ant is running in).<br/>Must support the same command line
      options as the Sun JDK <kbd>jarsigner</kbd> command.  <em>since Ant 1.8.0</em>.</td>
    <td>No</td>
  </tr>
  <tr>
    <td>force</td>
    <td>Whether to force signing of the jar file even if it doesn't seem to be out of date or
      already signed.  <em>since Ant 1.8.0</em>.</td>
    <td>No; default <q>false</q></td>
  </tr>
  <tr>
    <td>sigalg</td>
    <td>name of signature algorithm</td>
    <td>No</td>
  </tr>
  <tr>
    <td>digestalg</td>
    <td>name of digest algorithm</td>
    <td>No</td>
  </tr>
  <tr>
    <td>tsadigestalg</td>
    <td>name of TSA digest algorithm. <em>since Ant 1.10.2</em></td>
    <td>No</td>
  </tr>
  <tr>
    <td>providername</td>
    <td>name of a cryptographic service provider's name
      when listed in the security properties file.
      <em>since Ant 1.10.6</em>.</td>
    <td>No</td>
  </tr>
  <tr>
    <td>providerclass</td>
    <td>name of a cryptographic service provider's master
      class file when the service provider is not listed in the security
      properties file.
      <em>since Ant 1.10.6</em>.</td>
    <td>No</td>
  </tr>
  <tr>
    <td>providerarg</td>
    <td>Represents an optional string input argument for
      the constructor of provider_class_name. Ignored
      if <code>providerclass</code> is not set.
      <em>since Ant 1.10.6</em>.</td>
    <td>No</td>
  </tr>
</table>
<h3>Parameters as nested elements</h3>
<table class="attr">
  <tr>
    <th scope="col">Attribute</th>
    <th scope="col">Description</th>
    <th scope="col">Required</th>
  </tr>
  <tr>
    <td>path</td>
    <td>path of JAR files to sign. <em>since Ant 1.7</em></td>
    <td>No</td>
  </tr>
  <tr>
    <td>fileset</td>
    <td>fileset of JAR files to sign.</td>
    <td>No</td>
  </tr>
  <tr>
    <td>mapper</td>
    <td>A mapper to rename jar files during signing</td>
    <td>No, and only one can be supplied</td>
  </tr>
  <tr>
    <td>sysproperty</td>
    <td>JVM system properties, with the syntax of Ant <a href="exec.html#env">environment
      variables</a></td>
    <td>No, and only one can be supplied</td>
  </tr>
  <tr>
    <td>arg</td>
    <td>Use this to specify a <kbd>keytool</kbd>
    <a href="../using.html#arg">command line argument</a> not
    explicitly supported via an attribute.
    <em>since Ant 1.10.6</em>.</td>
    <td>No</td>
  </tr>
</table>

<h3>Examples</h3>
<p>For instructions on generating a code signing certificate, see
the <a href="https://docs.oracle.com/javase/8/docs/technotes/tools/windows/keytool.html"
target="_top">keytool documentation</a> and/or instructions from your certificate authority.</p>

<p>Sign the <samp>ant.jar</samp> with alias <q>apache-group</q> accessing the keystore and private
key via <q>secret</q> password.</p>
<pre>
&lt;signjar jar=&quot;${dist}/lib/ant.jar&quot;
         alias=&quot;apache-group&quot; storepass=&quot;secret&quot;/&gt;</pre>

<p>Sign all JAR files matching the <samp>dist/**/*.jar</samp> pattern, copying them to the
directory <samp>signed</samp> afterwards. The flatten mapper means that they will all be copied to
this directory, not to subdirectories.</p>
<pre>
&lt;signjar destDir="signed"
         alias="testonly" keystore="testkeystore"
         storepass="apacheant"
         preservelastmodified="true"&gt;
  &lt;path&gt;
    &lt;fileset dir="dist" includes="**/*.jar"/&gt;
  &lt;/path&gt;
  &lt;flattenmapper/&gt;
&lt;/signjar&gt;</pre>

<p>Sign all the JAR files in <samp>dist/**/*.jar</samp> <em>in-situ</em>. Lazy signing is used, so
the files will only be signed if they are not already signed.</p>
<pre>
&lt;signjar alias="testonly" keystore="testkeystore"
         storepass="apacheant"
         lazy="true"&gt;
  &lt;path&gt;
    &lt;fileset dir="dist" includes="**/*.jar"/&gt;
  &lt;/path&gt;
&lt;/signjar&gt;</pre>

<p>Sign all the JAR files in <samp>dist/**/*.jar</samp> using the digest algorithm SHA1 and the
signature algorithm MD5withRSA. This is especially useful when you want to use the JDK
7 <kbd>jarsigner</kbd> (which uses SHA256 and SHA256withRSA as default) to create signed jars that
will be deployed on platforms not supporting SHA256 and SHA256withRSA.</p>
<pre>
&lt;signjar alias="testonly" keystore="testkeystore"
         storepass="apacheant"
         sigalg="MD5withRSA"
         digestalg="SHA1"&gt;
  &lt;path&gt;
    &lt;fileset dir="dist" includes="**/*.jar"/&gt;
  &lt;/path&gt;
&lt;/signjar&gt;</pre>

<h3>About timestamp signing</h3>

<p>Timestamps record the date and time that a signature took place, allowing the signature to be
verified as of that point in time.  With trusted timestamping, users can verify that signing
occurred before a certificate's expiration or revocation. Without this timestamp, users can only
verify the signature as of their current date.</p>

<p>Timestamped JAR files were introduced in Java 5; they are supported <em>since Ant
1.7</em>. Unauthenticated proxies can be used to access TSAs <em>since Ant 1.9.5</em>.</p>

<p>Common public timestamp authorities include</p>
<ul>
  <li>http://timestamp.verisign.com</li>
  <li>http://tsa.starfieldtech.com</li>
  <li>https://timestamp.geotrust.com/tsa</li>
  <li>Others (see your certificate authority)</li>
</ul>

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