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diff --git a/getdown/src/getdown/core/src/main/java/com/threerings/getdown/tools/Digester.java b/getdown/src/getdown/core/src/main/java/com/threerings/getdown/tools/Digester.java
new file mode 100644
index 0000000..b04a653
--- /dev/null
+++ b/getdown/src/getdown/core/src/main/java/com/threerings/getdown/tools/Digester.java
@@ -0,0 +1,129 @@
+//
+// 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.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 com.threerings.getdown.data.Application;
+import com.threerings.getdown.data.Digest;
+import com.threerings.getdown.data.EnvConfig;
+import com.threerings.getdown.data.Resource;
+import com.threerings.getdown.util.Base64;
+
+import static java.nio.charset.StandardCharsets.UTF_8;
+
+/**
+ * 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
+    {
+        switch (args.length) {
+        case 1:
+            createDigests(new File(args[0]), null, null, null);
+            break;
+        case 4:
+            createDigests(new File(args[0]), new File(args[1]), args[2], args[3]);
+            break;
+        default:
+            System.err.println("Usage: Digester app_dir [keystore_path password alias]");
+            System.exit(255);
+        }
+    }
+
+    /**
+     * Creates digest file(s) and optionally signs them if {@code keystore} is not null.
+     */
+    public static void createDigests (File appdir, File keystore, String password, String alias)
+        throws IOException, GeneralSecurityException
+    {
+        for (int version = 1; version <= Digest.VERSION; version++) {
+            createDigest(version, appdir);
+            if (keystore != null) {
+                signDigest(version, appdir, keystore, password, alias);
+            }
+        }
+    }
+
+    /**
+     * Creates a digest file in the specified application directory.
+     */
+    public static void createDigest (int version, File appdir)
+        throws IOException
+    {
+        File target = new File(appdir, Digest.digestFile(version));
+        System.out.println("Generating digest file '" + target + "'...");
+
+        // create our application and instruct it to parse its business
+        Application app = new Application(new EnvConfig(appdir));
+        app.init(false);
+
+        List<Resource> rsrcs = new ArrayList<>();
+        rsrcs.add(app.getConfigResource());
+        rsrcs.addAll(app.getCodeResources());
+        rsrcs.addAll(app.getResources());
+        for (Application.AuxGroup ag : app.getAuxGroups()) {
+            rsrcs.addAll(ag.codes);
+            rsrcs.addAll(ag.rsrcs);
+        }
+
+        // now generate the digest file
+        Digest.createDigest(version, rsrcs, target);
+    }
+
+    /**
+     * Creates a digest file in the specified application directory.
+     */
+    public static void signDigest (int version, File appdir,
+                                   File storePath, String storePass, String storeAlias)
+        throws IOException, GeneralSecurityException
+    {
+        String filename = Digest.digestFile(version);
+        File inputFile = new File(appdir, filename);
+        File signatureFile = new File(appdir, filename + Application.SIGNATURE_SUFFIX);
+
+        try (FileInputStream storeInput = new FileInputStream(storePath);
+             FileInputStream dataInput = new FileInputStream(inputFile);
+             FileOutputStream signatureOutput = new FileOutputStream(signatureFile)) {
+
+            // initialize the keystore
+            KeyStore store = KeyStore.getInstance("JKS");
+            store.load(storeInput, storePass.toCharArray());
+            PrivateKey key = (PrivateKey)store.getKey(storeAlias, storePass.toCharArray());
+
+            // sign the digest file
+            String algo = Digest.sigAlgorithm(version);
+            Signature sig = Signature.getInstance(algo);
+            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
+            String signed = Base64.encodeToString(sig.sign(), Base64.DEFAULT);
+            signatureOutput.write(signed.getBytes(UTF_8));
+        }
+    }
+}