diff --git a/LauncherCore/src/main/java/pro/gravit/utils/verify/LauncherTrustManager.java b/LauncherCore/src/main/java/pro/gravit/utils/verify/LauncherTrustManager.java
index 8e4de504..b35fb07e 100644
--- a/LauncherCore/src/main/java/pro/gravit/utils/verify/LauncherTrustManager.java
+++ b/LauncherCore/src/main/java/pro/gravit/utils/verify/LauncherTrustManager.java
@@ -9,10 +9,7 @@
 import java.security.NoSuchAlgorithmException;
 import java.security.NoSuchProviderException;
 import java.security.SignatureException;
-import java.security.cert.CertificateEncodingException;
-import java.security.cert.CertificateException;
-import java.security.cert.CertificateFactory;
-import java.security.cert.X509Certificate;
+import java.security.cert.*;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
@@ -87,4 +84,15 @@ public boolean isTrusted(X509Certificate certificate) throws CertificateEncoding
     public X509Certificate[] getTrusted() {
         return Arrays.copyOf(trustSigners, trustSigners.length); // AntiModify orig array!!!
     }
+
+    public void isCertificateCodeSign(X509Certificate certificate)
+    {
+        if(!certificate.getKeyUsage()[0]) throw new SecurityException("Certificate keyUsage \"digitalSignature\" check failed");
+        List<String> extended;
+        try {
+            extended = certificate.getExtendedKeyUsage();
+        } catch (CertificateParsingException e) {
+            throw new SecurityException(e);
+        }
+    }
 }