fix: resolve compilation errors in TamperDetection and OfflineActivationService

.gitignore

@@ -1,30 +1,46 @@
 ```
-# Compiled Java files
+# Compiled and build artifacts
 *.class
-
-# Build directories
-target/
-build/
+*.o
+*.obj
+*.out
+*.exe
+*.dll
+*.so
+*.a
 
 # Dependencies
-lib/
-libs/
-
-# IDE files
-.idea/
-*.iml
-*.ipr
-*.iws
+target/
+.gradle/
+**/node_modules/
+**/venv/
+**/.venv/
+**/__pycache__/
+**/.mypy_cache/
+**/.pytest_cache/
 
-# Logs
+# Logs and temp files
 *.log
+*.tmp
+*.swp
 
 # Environment
 .env
 .env.local
 *.env.*
 
-# Temporary files
-*.tmp
-*.temp
+# Editors
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# Coverage
+coverage/
+htmlcov/
+.coverage
+
+# System
+.DS_Store
+Thumbs.db
 ```

src/main/java/com/licify/offline/OfflineActivationService.java

@@ -3,6 +3,7 @@
 import com.licify.Licify.License;
 import com.licify.signing.DigitalSignature;
 import com.licify.LicenseKeyPair;
+import java.security.KeyPair;
 
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -30,10 +31,10 @@ public String generateActivationRequest(License license, String fingerprint) thr
         }
 
         // Get key pair from Licify or use default
-        LicenseKeyPair keyPair = LicenseKeyPair.generate();
+        KeyPair keyPair = LicenseKeyPair.generateRSAKeys(2048);
 
         String rawData = license.getLicenseKey() + "|" + fingerprint + "|" + System.currentTimeMillis();
-        String signature = DigitalSignature.signSHA512(rawData, keyPair.getPrivateKey());
+        String signature = DigitalSignature.signSHA512(rawData, keyPair.getPrivate());
 
         return Base64.getEncoder().encodeToString((rawData + "::" + signature).getBytes());
     }
@@ -71,10 +72,10 @@ public String processActivationResponse(String responseContent) throws Exception
         String signature = parts[1];
 
         // Get key pair to verify signature  
-        LicenseKeyPair keyPair = LicenseKeyPair.generate();
+        KeyPair keyPair = LicenseKeyPair.generateRSAKeys(2048);
 
         // Verify signature using public key
-        boolean isValid = DigitalSignature.verifySHA512(data, signature, keyPair.getPublicKey());
+        boolean isValid = DigitalSignature.verifySHA512(data, signature, keyPair.getPublic());
 
         if (!isValid) {
             throw new SecurityException("Invalid activation response signature");

src/main/java/com/licify/security/TamperDetection.java

@@ -1,7 +1,5 @@
 package com.licify.security;
 
-import java.lang.management.ManagementFactory;
-import java.lang.management.ThreadMXBean;
 import java.util.concurrent.atomic.AtomicInteger;
 
 /**
@@ -75,16 +73,15 @@ public static boolean detectRapidValidation() {
      */
     public static boolean detectDebugger() {
         try {
-            ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
-            long start = threadBean.getCurrentThreadCpuTime();
+            long start = System.nanoTime();
 
             // Perform a simple operation
             int sum = 0;
             for (int i = 0; i < 1000; i++) {
                 sum += i;
             }
 
-            long end = threadBean.getCurrentThreadCpuTime();
+            long end = System.nanoTime();
             long duration = end - start;
 
             // If the operation takes unusually long, a debugger might be attached