diff --git a/build-proguard.xml b/build-proguard.xml
index 3fc6ca8..f56c1d2 100644
--- a/build-proguard.xml
+++ b/build-proguard.xml
@@ -54,6 +54,9 @@
       <keep name="com.threerings.getdown.tools.Patcher">
         <method access="static" name="main"/>
       </keep>
+      <keep name="com.threerings.getdown.tools.Digester">
+        <method access="static" name="main"/>
+      </keep>
       <keep name="com.threerings.getdown.tools.AppletParamSigner">
         <method access="static" name="main"/>
       </keep>
@@ -72,7 +75,7 @@
     </proguard>
 
     <delete file="target/runtime.jar"/>
-    <rename src="target/getdown-pro-${maven.version}.jar"
-            dest="target/getdown-${maven.version}.jar" replace="true"/>
+    <move file="target/getdown-pro-${maven.version}.jar"
+          tofile="target/getdown-${maven.version}.jar" overwrite="true"/>
   </target>
 </project>
diff --git a/src/main/java/com/threerings/getdown/tools/Digester.java b/src/main/java/com/threerings/getdown/tools/Digester.java
new file mode 100644
index 0000000..a059f2c
--- /dev/null
+++ b/src/main/java/com/threerings/getdown/tools/Digester.java
@@ -0,0 +1,124 @@
+//
+// $Id$
+//
+// Getdown - application installer, patcher and launcher
+// Copyright (C) 2004-2010 Three Rings Design, Inc.
+//
+// Redistribution and use in source and binary forms, with or without modification, are permitted
+// provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list of
+//    conditions and the following disclaimer in the documentation and/or other materials provided
+//    with the distribution.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+// PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+// TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package com.threerings.getdown.tools;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+
+import java.security.GeneralSecurityException;
+import java.security.KeyStore;
+import java.security.PrivateKey;
+import java.security.Signature;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.commons.codec.binary.Base64;
+
+import com.threerings.getdown.data.Application;
+import com.threerings.getdown.data.Digest;
+import com.threerings.getdown.data.Resource;
+
+/**
+ * Handles the generation of the digest.txt file.
+ */
+public class Digester
+{
+    /**
+     * A command line entry point for the digester.
+     */
+    public static void main (String[] args)
+        throws IOException, GeneralSecurityException
+    {
+        if (args.length != 1 || args.length != 4) {
+            System.err.println("Usage: Digester app_dir [keystore_path password alias]");
+            System.exit(255);
+        }
+
+        createDigest(new File(args[0]));
+        if (args.length == 4) {
+            signDigest(new File(args[0]), new File(args[1]), args[2], args[3]);
+        }
+    }
+
+    /**
+     * Creates a digest file in the specified application directory.
+     */
+    public static void createDigest (File appdir)
+        throws IOException
+    {
+        File target = new File(appdir, Digest.DIGEST_FILE);
+        System.out.println("Generating digest file '" + target + "'...");
+
+        // create our application and instruct it to parse its business
+        Application app = new Application(appdir, null);
+        app.init(false);
+
+        List<Resource> rsrcs = new ArrayList<Resource>();
+        rsrcs.add(app.getConfigResource());
+        rsrcs.addAll(app.getCodeResources());
+        rsrcs.addAll(app.getResources());
+        for (String auxgroup : app.getAuxGroups()) {
+            rsrcs.addAll(app.getResources(auxgroup));
+        }
+
+        // now generate the digest file
+        Digest.createDigest(rsrcs, target);
+    }
+
+    /**
+     * Creates a digest file in the specified application directory.
+     */
+    public static void signDigest (File appdir, File storePath, String storePass, String storeAlias)
+        throws IOException, GeneralSecurityException
+    {
+        File inputFile = new File(appdir, Digest.DIGEST_FILE);
+        File signatureFile = new File(appdir, Digest.DIGEST_FILE + Application.SIGNATURE_SUFFIX);
+
+        // initialize the keystore
+        KeyStore store = KeyStore.getInstance("JKS");
+        FileInputStream storeInput = new FileInputStream(storePath);
+        store.load(storeInput, storePass.toCharArray());
+        PrivateKey key = (PrivateKey)store.getKey(storeAlias, storePass.toCharArray());
+
+        // sign the digest file
+        Signature sig = Signature.getInstance("SHA1withRSA");
+        FileInputStream dataInput = new FileInputStream(inputFile);
+        byte[] buffer = new byte[8192];
+        int length;
+
+        sig.initSign(key);
+        while ((length = dataInput.read(buffer)) != -1) {
+            sig.update(buffer, 0, length);
+        }
+
+        // Write out the signature
+        FileOutputStream signatureOutput = new FileOutputStream(signatureFile);
+        String signed = new String(Base64.encodeBase64(sig.sign()));
+        signatureOutput.write(signed.getBytes("utf8"));
+    }
+}
diff --git a/src/main/java/com/threerings/getdown/tools/DigesterTask.java b/src/main/java/com/threerings/getdown/tools/DigesterTask.java
index ac4be17..821a06e 100644
--- a/src/main/java/com/threerings/getdown/tools/DigesterTask.java
+++ b/src/main/java/com/threerings/getdown/tools/DigesterTask.java
@@ -25,24 +25,13 @@
 package com.threerings.getdown.tools;
 
 import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
 import java.io.IOException;
-import java.util.ArrayList;
 
 import java.security.GeneralSecurityException;
-import java.security.KeyStore;
-import java.security.PrivateKey;
-import java.security.Signature;
 
-import org.apache.commons.codec.binary.Base64;
 import org.apache.tools.ant.BuildException;
 import org.apache.tools.ant.Task;
 
-import com.threerings.getdown.data.Application;
-import com.threerings.getdown.data.Digest;
-import com.threerings.getdown.data.Resource;
-
 /**
  * An ant task used to create a <code>digest.txt</code> for a Getdown
  * application deployment.
@@ -102,9 +91,9 @@ public class DigesterTask extends Task
         }
 
         try {
-            createDigest(_appdir);
+            Digester.createDigest(_appdir);
             if (_storepath != null) {
-                signDigest(_appdir, _storepath, _storepass, _storealias);
+                Digester.signDigest(_appdir, _storepath, _storepass, _storealias);
             }
         } catch (IOException ioe) {
             throw new BuildException("Error creating digest: " + ioe.getMessage(), ioe);
@@ -113,63 +102,6 @@ public class DigesterTask extends Task
         }
     }
 
-    /**
-     * Creates a digest file in the specified application directory.
-     */
-    public static void createDigest (File appdir)
-        throws IOException
-    {
-        File target = new File(appdir, Digest.DIGEST_FILE);
-        System.out.println("Generating digest file '" + target + "'...");
-
-        // create our application and instruct it to parse its business
-        Application app = new Application(appdir, null);
-        app.init(false);
-
-        ArrayList<Resource> rsrcs = new ArrayList<Resource>();
-        rsrcs.add(app.getConfigResource());
-        rsrcs.addAll(app.getCodeResources());
-        rsrcs.addAll(app.getResources());
-        for (String auxgroup : app.getAuxGroups()) {
-            rsrcs.addAll(app.getResources(auxgroup));
-        }
-
-        // now generate the digest file
-        Digest.createDigest(rsrcs, target);
-    }
-
-    /**
-     * Creates a digest file in the specified application directory.
-     */
-    public static void signDigest (File appdir, File storePath, String storePass, String storeAlias)
-        throws IOException, GeneralSecurityException
-    {
-        File inputFile = new File(appdir, Digest.DIGEST_FILE);
-        File signatureFile = new File(appdir, Digest.DIGEST_FILE + Application.SIGNATURE_SUFFIX);
-
-        // initialize the keystore
-        KeyStore store = KeyStore.getInstance("JKS");
-        FileInputStream storeInput = new FileInputStream(storePath);
-        store.load(storeInput, storePass.toCharArray());
-        PrivateKey key = (PrivateKey)store.getKey(storeAlias, storePass.toCharArray());
-
-        // sign the digest file
-        Signature sig = Signature.getInstance("SHA1withRSA");
-        FileInputStream dataInput = new FileInputStream(inputFile);
-        byte[] buffer = new byte[8192];
-        int length;
-
-        sig.initSign(key);
-        while ((length = dataInput.read(buffer)) != -1) {
-            sig.update(buffer, 0, length);
-        }
-
-        // Write out the signature
-        FileOutputStream signatureOutput = new FileOutputStream(signatureFile);
-        String signed = new String(Base64.encodeBase64(sig.sign()));
-        signatureOutput.write(signed.getBytes("utf8"));
-    }
-
     /** The application directory in which we're creating a digest file. */
     protected File _appdir;