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diff --git a/getdown/src/getdown/ant/src/main/java/com/threerings/getdown/tools/DigesterTask.java b/getdown/src/getdown/ant/src/main/java/com/threerings/getdown/tools/DigesterTask.java
new file mode 100644
index 0000000..48cc8d4
--- /dev/null
+++ b/getdown/src/getdown/ant/src/main/java/com/threerings/getdown/tools/DigesterTask.java
@@ -0,0 +1,94 @@
+//
+// Getdown - application installer, patcher and launcher
+// Copyright (C) 2004-2018 Getdown authors
+// https://github.com/threerings/getdown/blob/master/LICENSE
+
+package com.threerings.getdown.tools;
+
+import java.io.File;
+import java.io.IOException;
+
+import java.security.GeneralSecurityException;
+
+import org.apache.tools.ant.BuildException;
+import org.apache.tools.ant.Task;
+
+import com.threerings.getdown.data.Digest;
+
+/**
+ * An ant task used to create a <code>digest.txt</code> for a Getdown
+ * application deployment.
+ */
+public class DigesterTask extends Task
+{
+    /**
+     * Sets the application directory.
+     */
+    public void setAppdir (File appdir)
+    {
+        _appdir = appdir;
+    }
+
+    /**
+     * Sets the digest signing keystore.
+     */
+    public void setKeystore (File path)
+    {
+        _storepath = path;
+    }
+
+    /**
+     * Sets the keystore decryption key.
+     */
+    public void setStorepass (String password)
+    {
+        _storepass = password;
+    }
+
+    /**
+     * Sets the private key alias.
+     */
+    public void setAlias (String alias)
+    {
+        _storealias = alias;
+    }
+
+    /**
+     * Performs the actual work of the task.
+     */
+    @Override
+    public void execute () throws BuildException
+    {
+        // make sure appdir is set
+        if (_appdir == null) {
+            throw new BuildException("Must specify the path to the application directory " +
+                                     "via the 'appdir' attribute.");
+        }
+
+        // make sure _storepass and _keyalias are set, if _storepath is set
+        if (_storepath != null && (_storepass == null || _storealias == null)) {
+            throw new BuildException(
+                    "Must specify both a keystore password and a private key alias.");
+        }
+
+        try {
+            Digester.createDigests(_appdir, _storepath, _storepass, _storealias);
+        } catch (IOException ioe) {
+            throw new BuildException("Error creating digest: " + ioe.getMessage(), ioe);
+        } catch (GeneralSecurityException gse) {
+            throw new BuildException("Error creating signature: " + gse.getMessage(), gse);
+        }
+    }
+
+    /** The application directory in which we're creating a digest file. */
+    protected File _appdir;
+
+    /** The path to the keystore we'll use to sign the digest file, if any. */
+    protected File _storepath;
+
+    /** The decryption key for the keystore. */
+    protected String _storepass;
+
+    /** The private key alias. */
+    protected String _storealias;
+}