diff --git a/LaunchServer/src/main/java/pro/gravit/launchserver/binary/JARLauncherBinary.java b/LaunchServer/src/main/java/pro/gravit/launchserver/binary/JARLauncherBinary.java
index e28d0f04..b8082682 100644
--- a/LaunchServer/src/main/java/pro/gravit/launchserver/binary/JARLauncherBinary.java
+++ b/LaunchServer/src/main/java/pro/gravit/launchserver/binary/JARLauncherBinary.java
@@ -47,6 +47,7 @@ public void init() {
         tasks.add(new AdditionalFixesApplyTask(server));
         if (!server.config.launcher.attachLibraryBeforeProGuard) tasks.add(new AttachJarsTask(server));
         if (server.config.launcher.compress) tasks.add(new CompressBuildTask(server));
+        if(server.config.sign.enabled) tasks.add(new SignJarTask(server.config.sign, server));
     }
 
     @Override
diff --git a/LaunchServer/src/main/java/pro/gravit/launchserver/binary/SignerJar.java b/LaunchServer/src/main/java/pro/gravit/launchserver/binary/SignerJar.java
new file mode 100644
index 00000000..b0d525cb
--- /dev/null
+++ b/LaunchServer/src/main/java/pro/gravit/launchserver/binary/SignerJar.java
@@ -0,0 +1,287 @@
+package pro.gravit.launchserver.binary;
+
+import org.bouncycastle.cms.CMSProcessableByteArray;
+import org.bouncycastle.cms.CMSSignedData;
+import org.bouncycastle.cms.CMSSignedDataGenerator;
+import org.bouncycastle.cms.CMSTypedData;
+import pro.gravit.launchserver.helper.SignHelper;
+import pro.gravit.utils.helper.IOHelper;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Arrays;
+import java.util.Base64;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.function.Supplier;
+import java.util.jar.Attributes;
+import java.util.jar.Manifest;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipOutputStream;
+
+
+/**
+ * Generator of signed Jars. It stores some data in memory therefore it is not suited for creation of large files. The
+ * usage:
+ * <pre>
+ * KeyStore keystore = KeyStore.getInstance("JKS");
+ * keyStore.load(keystoreStream, "keystorePassword");
+ * SignerJar jar = new SignerJar(out, keyStore, "keyAlias", "keyPassword");
+ * signedJar.addManifestAttribute("Main-Class", "com.example.MainClass");
+ * signedJar.addManifestAttribute("Application-Name", "Example");
+ * signedJar.addManifestAttribute("Permissions", "all-permissions");
+ * signedJar.addManifestAttribute("Codebase", "*");
+ * signedJar.addFileContents("com/example/MainClass.class", clsData);
+ * signedJar.addFileContents("JNLP-INF/APPLICATION.JNLP", generateJnlpContents());
+ * signedJar.close();
+ * </pre>
+ */
+public class SignerJar implements AutoCloseable {
+
+	private static final String MANIFEST_FN = "META-INF/MANIFEST.MF";
+    private static final String SIG_FN = "META-INF/SIGNUMO.SF";
+    private static final String SIG_RSA_FN = "META-INF/SIGNUMO.RSA";
+	private static final String DIGEST_HASH = SignHelper.hashFunctionName + "-Digest";
+
+    private final ZipOutputStream zos;
+
+    private final Map<String, String> manifestAttributes;
+    private String manifestHash;
+    private String manifestMainHash;
+
+    private final Map<String, String> fileDigests;
+
+    private final Map<String, String> sectionDigests;
+	private final Supplier<CMSSignedDataGenerator> gen;
+
+    public SignerJar(ZipOutputStream out, Supplier<CMSSignedDataGenerator> gen) {
+        zos = out;
+        this.gen = gen;
+        manifestAttributes = new LinkedHashMap<>();
+        fileDigests = new LinkedHashMap<>();
+        sectionDigests = new LinkedHashMap<>();
+    }
+
+    /**
+     * Adds a file to the JAR. The file is immediately added to the zipped output stream. This method cannot be called once
+     * the stream is closed.
+     *
+     * @param filename name of the file to add (use forward slash as a path separator)
+     * @param contents contents of the file
+     * @throws IOException
+     * @throws NullPointerException if any of the arguments is {@code null}
+     */
+    public void addFileContents(String filename, byte[] contents) throws IOException {
+    	addFileContents(filename, new ByteArrayInputStream(contents));
+    }
+
+    /**
+     * Adds a file to the JAR. The file is immediately added to the zipped output stream. This method cannot be called once
+     * the stream is closed.
+     *
+     * @param filename name of the file to add (use forward slash as a path separator)
+     * @param contents contents of the file
+     * @throws IOException
+     * @throws NullPointerException if any of the arguments is {@code null}
+     */
+    public void addFileContents(String filename, InputStream contents) throws IOException {
+    	addFileContents(IOHelper.newZipEntry(filename), contents);
+    }
+
+    /**
+     * Adds a file to the JAR. The file is immediately added to the zipped output stream. This method cannot be called once
+     * the stream is closed.
+     *
+     * @param entry    name of the file to add (use forward slash as a path separator)
+     * @param contents contents of the file
+     * @throws IOException
+     * @throws NullPointerException if any of the arguments is {@code null}
+     */
+    public void addFileContents(ZipEntry entry, byte[] contents) throws IOException {
+    	addFileContents(entry, new ByteArrayInputStream(contents));
+    }
+
+    /**
+     * Adds a file to the JAR. The file is immediately added to the zipped output stream. This method cannot be called once
+     * the stream is closed.
+     *
+     * @param entry    name of the file to add (use forward slash as a path separator)
+     * @param contents contents of the file
+     * @throws IOException
+     * @throws NullPointerException if any of the arguments is {@code null}
+     */
+    public void addFileContents(ZipEntry entry, InputStream contents) throws IOException {
+        zos.putNextEntry(entry);
+        SignHelper.HashingOutputStream out = new SignHelper.HashingNonClosingOutputStream(zos, SignHelper.hasher());
+        IOHelper.transfer(contents, out);
+        zos.closeEntry();
+        fileDigests.put(entry.getName(), Base64.getEncoder().encodeToString(out.digest()));
+    }
+
+    /**
+     * Adds a header to the manifest of the JAR.
+     *
+     * @param name  name of the attribute, it is placed into the main section of the manifest file
+     * @param value value of the attribute
+     */
+    public void addManifestAttribute(String name, String value) {
+        manifestAttributes.put(name, value);
+    }
+
+
+    /**
+     * Closes the JAR file by writing the manifest and signature data to it and finishing the ZIP entries. It closes the
+     * underlying stream.
+     *
+     * @throws IOException
+     * @throws RuntimeException    if the signing goes wrong
+     */
+    @Override
+    public void close() throws IOException {
+        finish();
+        zos.close();
+    }
+
+
+    /**
+     * Finishes the JAR file by writing the manifest and signature data to it and finishing the ZIP entries. It leaves the
+     * underlying stream open.
+     *
+     * @throws IOException
+     * @throws RuntimeException    if the signing goes wrong
+     */
+    public void finish() throws IOException {
+        writeManifest();
+        byte[] sig = writeSigFile();
+        writeSignature(sig);
+        zos.finish();
+    }
+
+    public ZipOutputStream getZos() {
+        return zos;
+    }
+
+    /**
+     * Helper for {@link #writeManifest()} that creates the digest of one entry.
+     */
+    private String hashEntrySection(String name, Attributes attributes) throws IOException {
+        Manifest manifest = new Manifest();
+        manifest.getMainAttributes().put(Attributes.Name.MANIFEST_VERSION, "1.0");
+        ByteArrayOutputStream o = new ByteArrayOutputStream();
+        manifest.write(o);
+        int emptyLen = o.toByteArray().length;
+
+        manifest.getEntries().put(name, attributes);
+
+        manifest.write(o);
+        byte[] ob = o.toByteArray();
+        ob = Arrays.copyOfRange(ob, emptyLen, ob.length);
+        return Base64.getEncoder().encodeToString(SignHelper.hasher().digest(ob));
+    }
+
+    /**
+     * Helper for {@link #writeManifest()} that creates the digest of the main section.
+     */
+    private String hashMainSection(Attributes attributes) throws IOException {
+        Manifest manifest = new Manifest();
+        manifest.getMainAttributes().putAll(attributes);
+        SignHelper.HashingOutputStream o = new SignHelper.HashingNonClosingOutputStream(SignHelper.NULL, SignHelper.hasher());
+        manifest.write(o);
+        return Base64.getEncoder().encodeToString(o.digest());
+    }
+
+    /**
+     * Returns the CMS signed data.
+     */
+    private byte[] signSigFile(byte[] sigContents) throws Exception {
+        CMSSignedDataGenerator gen = this.gen.get();
+        CMSTypedData cmsData = new CMSProcessableByteArray(sigContents);
+        CMSSignedData signedData = gen.generate(cmsData, true);
+        return signedData.getEncoded();
+    }
+
+    /**
+     * Writes the manifest to the JAR. It also calculates the digests that are required to be placed in the the signature
+     * file.
+     *
+     * @throws IOException
+     */
+    private void writeManifest() throws IOException {
+        zos.putNextEntry(IOHelper.newZipEntry(MANIFEST_FN));
+        Manifest man = new Manifest();
+
+        // main section
+        Attributes mainAttributes = man.getMainAttributes();
+        mainAttributes.put(Attributes.Name.MANIFEST_VERSION, "1.0");
+
+        for (Map.Entry<String, String> entry : manifestAttributes.entrySet())
+            mainAttributes.put(new Attributes.Name(entry.getKey()), entry.getValue());
+
+        // individual files sections
+        Attributes.Name digestAttr = new Attributes.Name(DIGEST_HASH);
+        for (Map.Entry<String, String> entry : fileDigests.entrySet()) {
+            Attributes attributes = new Attributes();
+            man.getEntries().put(entry.getKey(), attributes);
+            attributes.put(digestAttr, entry.getValue());
+            sectionDigests.put(entry.getKey(), hashEntrySection(entry.getKey(), attributes));
+        }
+
+        SignHelper.HashingOutputStream out = new SignHelper.HashingNonClosingOutputStream(zos, SignHelper.hasher());
+        man.write(out);
+        zos.closeEntry();
+
+        manifestHash = Base64.getEncoder().encodeToString(out.digest());
+        manifestMainHash = hashMainSection(man.getMainAttributes());
+    }
+
+    /**
+     * Writes the .SIG file to the JAR.
+     *
+     * @return the contents of the file as bytes
+     */
+    private byte[] writeSigFile() throws IOException {
+        zos.putNextEntry(IOHelper.newZipEntry(SIG_FN));
+        Manifest man = new Manifest();
+        // main section
+        Attributes mainAttributes = man.getMainAttributes();
+        mainAttributes.put(Attributes.Name.SIGNATURE_VERSION, "1.0");
+        mainAttributes.put(new Attributes.Name(DIGEST_HASH + "-Manifest"), manifestHash);
+        mainAttributes.put(new Attributes.Name(DIGEST_HASH + "-Manifest-Main-Attributes"), manifestMainHash);
+
+        // individual files sections
+        Attributes.Name digestAttr = new Attributes.Name(DIGEST_HASH);
+        for (Map.Entry<String, String> entry : sectionDigests.entrySet()) {
+            Attributes attributes = new Attributes();
+            man.getEntries().put(entry.getKey(), attributes);
+            attributes.put(digestAttr, entry.getValue());
+        }
+
+        man.write(zos);
+        zos.closeEntry();
+
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        man.write(baos);
+        return baos.toByteArray();
+    }
+
+    /**
+     * Signs the .SIG file and writes the signature (.RSA file) to the JAR.
+     *
+     * @throws IOException
+     * @throws RuntimeException    if the signing failed
+     */
+    private void writeSignature(byte[] sigFile) throws IOException {
+        zos.putNextEntry(IOHelper.newZipEntry(SIG_RSA_FN));
+        try {
+            byte[] signature = signSigFile(sigFile);
+            zos.write(signature);
+        } catch (IOException e) {
+            throw e;
+        } catch (Exception e) {
+            throw new RuntimeException("Signing failed.", e);
+        }
+        zos.closeEntry();
+    }
+}
\ No newline at end of file
diff --git a/LaunchServer/src/main/java/pro/gravit/launchserver/binary/tasks/SignJarTask.java b/LaunchServer/src/main/java/pro/gravit/launchserver/binary/tasks/SignJarTask.java
new file mode 100644
index 00000000..8746b342
--- /dev/null
+++ b/LaunchServer/src/main/java/pro/gravit/launchserver/binary/tasks/SignJarTask.java
@@ -0,0 +1,78 @@
+package pro.gravit.launchserver.binary.tasks;
+
+import org.bouncycastle.cms.CMSException;
+import org.bouncycastle.cms.CMSSignedDataGenerator;
+import org.bouncycastle.operator.OperatorCreationException;
+import pro.gravit.launchserver.LaunchServer;
+import pro.gravit.launchserver.binary.SignerJar;
+import pro.gravit.launchserver.config.LaunchServerConfig;
+import pro.gravit.launchserver.helper.SignHelper;
+import pro.gravit.utils.helper.IOHelper;
+import pro.gravit.utils.helper.LogHelper;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Path;
+import java.security.KeyStore;
+import java.security.KeyStoreException;
+import java.security.NoSuchAlgorithmException;
+import java.security.UnrecoverableKeyException;
+import java.security.cert.CertificateEncodingException;
+import java.util.jar.Manifest;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipInputStream;
+import java.util.zip.ZipOutputStream;
+
+public class SignJarTask implements LauncherBuildTask {
+
+    private final LaunchServerConfig.JarSignerConf config;
+    private final LaunchServer srv;
+
+    public SignJarTask(LaunchServerConfig.JarSignerConf config, LaunchServer srv) {
+        this.config = config;
+        this.srv = srv;
+    }
+
+    @Override
+    public String getName() {
+        return "SignJar";
+    }
+
+    @Override
+    public Path process(Path inputFile) throws IOException {
+        Path toRet = srv.launcherBinary.nextPath("signed");
+        KeyStore c = SignHelper.getStore(new File(config.keyStore).toPath(), config.keyStorePass, config.keyStoreType);
+        try (SignerJar output = new SignerJar(new ZipOutputStream(IOHelper.newOutput(toRet)), () -> this.gen(c));
+             ZipInputStream input = new ZipInputStream(IOHelper.newInput(inputFile))) {
+            //input.getManifest().getMainAttributes().forEach((a, b) -> output.addManifestAttribute(a.toString(), b.toString())); // may not work such as after Radon.
+            ZipEntry e = input.getNextEntry();
+            while (e != null) {
+               if ("META-INF/MANIFEST.MF".equals(e.getName()) || "/META-INF/MANIFEST.MF".equals(e.getName())) {
+               	 Manifest m = new Manifest(input);
+               	 m.getMainAttributes().forEach((a, b) -> output.addManifestAttribute(a.toString(), b.toString()));
+               	 e = input.getNextEntry();
+               	 continue;
+               }
+                output.addFileContents(IOHelper.newZipEntry(e), input);
+                e = input.getNextEntry();
+            }
+        }
+        return toRet;
+    }
+
+    @Override
+    public boolean allowDelete() {
+        return true;
+    }
+    
+    public CMSSignedDataGenerator gen(KeyStore c) {
+    	try {
+			return SignHelper.createSignedDataGenerator(c,
+			        config.keyAlias, config.signAlgo, config.keyStorePass);
+		} catch (CertificateEncodingException | UnrecoverableKeyException | KeyStoreException
+				| OperatorCreationException | NoSuchAlgorithmException | CMSException e) {
+			LogHelper.error(e);
+			return null;
+		}
+    }
+}
diff --git a/LaunchServer/src/main/java/pro/gravit/launchserver/config/LaunchServerConfig.java b/LaunchServer/src/main/java/pro/gravit/launchserver/config/LaunchServerConfig.java
index fcc9cec0..27b010dd 100644
--- a/LaunchServer/src/main/java/pro/gravit/launchserver/config/LaunchServerConfig.java
+++ b/LaunchServer/src/main/java/pro/gravit/launchserver/config/LaunchServerConfig.java
@@ -88,6 +88,7 @@ public AuthProviderPair getAuthProviderPair() {
     public String whitelistRejectString;
     public LauncherConf launcher;
     public CertificateConf certificate;
+    public JarSignerConf sign;
 
     public String startScript;
 
@@ -225,6 +226,16 @@ public static class CertificateConf {
         public boolean enabled;
     }
 
+    public static class JarSignerConf {
+        public boolean enabled = true;
+        public String keyStore = "pathToKey";
+        public String keyStoreType = "JKS";
+        public String keyStorePass = "mypass";
+        public String keyAlias = "myname";
+        public String keyPass = "mypass";
+        public String signAlgo = "SHA256WITHRSA";
+    }
+
     public static class NettyUpdatesBind {
         public String url;
         public boolean zip;
@@ -324,6 +335,7 @@ public static LaunchServerConfig getDefault(LaunchServer.LaunchServerEnv env) {
 
         newConfig.certificate = new LaunchServerConfig.CertificateConf();
         newConfig.certificate.enabled = false;
+        newConfig.sign = new JarSignerConf();
 
         newConfig.components = new HashMap<>();
         AuthLimiterComponent authLimiterComponent = new AuthLimiterComponent();
diff --git a/LaunchServer/src/main/java/pro/gravit/launchserver/helper/SignHelper.java b/LaunchServer/src/main/java/pro/gravit/launchserver/helper/SignHelper.java
new file mode 100644
index 00000000..86e3a165
--- /dev/null
+++ b/LaunchServer/src/main/java/pro/gravit/launchserver/helper/SignHelper.java
@@ -0,0 +1,158 @@
+package pro.gravit.launchserver.helper;
+
+import org.bouncycastle.cert.jcajce.JcaCertStore;
+import org.bouncycastle.cms.CMSException;
+import org.bouncycastle.cms.CMSSignedDataGenerator;
+import org.bouncycastle.cms.SignerInfoGenerator;
+import org.bouncycastle.cms.jcajce.JcaSignerInfoGeneratorBuilder;
+import org.bouncycastle.jce.provider.BouncyCastleProvider;
+import org.bouncycastle.operator.ContentSigner;
+import org.bouncycastle.operator.DigestCalculatorProvider;
+import org.bouncycastle.operator.OperatorCreationException;
+import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
+import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;
+import org.bouncycastle.util.Store;
+import pro.gravit.utils.helper.IOHelper;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.file.Path;
+import java.security.*;
+import java.security.cert.Certificate;
+import java.security.cert.CertificateEncodingException;
+import java.security.cert.CertificateException;
+import java.security.cert.X509Certificate;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+public class SignHelper {
+
+    /**
+     * Helper output stream that also sends the data to the given.
+     */
+    public static class HashingOutputStream extends OutputStream {
+    	public final OutputStream out;
+    	public final MessageDigest hasher;
+
+        public HashingOutputStream(OutputStream out, MessageDigest hasher) {
+            this.out = out;
+            this.hasher = hasher;
+        }
+
+        @Override
+        public void close() throws IOException {
+            out.close();
+        }
+
+        @Override
+        public void flush() throws IOException {
+            out.flush();
+        }
+
+        @Override
+        public void write(byte[] b) throws IOException {
+            out.write(b);
+            hasher.update(b);
+        }
+
+        @Override
+        public void write(byte[] b, int off, int len) throws IOException {
+            out.write(b, off, len);
+            hasher.update(b, off, len);
+        }
+
+        @Override
+        public void write(int b) throws IOException {
+            out.write(b);
+            hasher.update((byte) b);
+        }
+        
+        public byte[] digest() {
+        	return hasher.digest();
+        }
+    }
+    /**
+     * Helper output stream that also sends the data to the given.
+     */
+    public static class HashingNonClosingOutputStream extends HashingOutputStream {
+        public HashingNonClosingOutputStream(OutputStream out, MessageDigest hasher) {
+            super(out, hasher);
+        }
+
+        @Override
+        public void close() throws IOException {
+        	// Do nothing
+        }
+    }
+    
+    public static final OutputStream NULL = new OutputStream() {
+        @Override
+        public String toString() {
+            return "NullOutputStream";
+        }
+
+        /** Discards the specified byte array. */
+        @Override
+        public void write(byte[] b) {
+        }
+
+        /** Discards the specified byte array. */
+        @Override
+        public void write(byte[] b, int off, int len) {
+        }
+
+        /** Discards the specified byte. */
+        @Override
+        public void write(int b) {
+        }
+        
+        /** Never closes */
+        @Override
+        public void close() {
+        }
+    };
+	private SignHelper() {
+	}
+	
+	/**
+     * Creates the KeyStore with given algo.
+     */
+    public static KeyStore getStore(Path file, String storepass, String algo) throws IOException {
+        try {
+            KeyStore st = KeyStore.getInstance(algo);
+            st.load(IOHelper.newInput(file), storepass != null ? storepass.toCharArray() : null);
+            return st;
+        } catch (NoSuchAlgorithmException | CertificateException | KeyStoreException e) {
+            throw new IOException(e);
+        }
+    }
+
+    /**
+     * Creates the beast that can actually sign the data (for JKS, for other make it).
+     */
+    public static CMSSignedDataGenerator createSignedDataGenerator(KeyStore keyStore, String keyAlias, String signAlgo, String keyPassword) throws KeyStoreException, OperatorCreationException, CertificateEncodingException, UnrecoverableKeyException, NoSuchAlgorithmException, CMSException {
+        List<Certificate> certChain = new ArrayList<>(Arrays.asList(keyStore.getCertificateChain(keyAlias)));
+        @SuppressWarnings("rawtypes")
+        Store certStore = new JcaCertStore(certChain);
+        Certificate cert = keyStore.getCertificate(keyAlias);
+        PrivateKey privateKey = (PrivateKey) keyStore.getKey(keyAlias, keyPassword != null ? keyPassword.toCharArray() : null);
+        ContentSigner signer = new JcaContentSignerBuilder(signAlgo).setProvider("BC").build(privateKey);
+        CMSSignedDataGenerator generator = new CMSSignedDataGenerator();
+        DigestCalculatorProvider dcp = new JcaDigestCalculatorProviderBuilder().setProvider("BC").build();
+        SignerInfoGenerator sig = new JcaSignerInfoGeneratorBuilder(dcp).build(signer, (X509Certificate) cert);
+        generator.addSignerInfoGenerator(sig);
+        generator.addCertificates(certStore);
+        return generator;
+    }
+
+    public static final String hashFunctionName = "SHA-256";
+    
+    public static MessageDigest hasher() {
+        try {
+            return MessageDigest.getInstance(hashFunctionName);
+        } catch (NoSuchAlgorithmException e) {
+            return null;
+        }
+    }
+}
diff --git a/modules b/modules
index bcaa597a..6f008f59 160000
--- a/modules
+++ b/modules
@@ -1 +1 @@
-Subproject commit bcaa597a85e3ff749144fabc182e47b26f4f14ef
+Subproject commit 6f008f595975887b6a1366cb444b82b339e3afad