Changed random seed generation for bitcoin.

android/app/src/main/java/com/cakewallet/cake_wallet/MainActivity.java

@@ -1,15 +1,49 @@
 package com.cakewallet.cake_wallet;
 
 import androidx.annotation.NonNull;
+
 import io.flutter.embedding.android.FlutterFragmentActivity;
 import io.flutter.embedding.engine.FlutterEngine;
 import io.flutter.plugins.GeneratedPluginRegistrant;
 
+import io.flutter.plugin.common.MethodCall;
+import io.flutter.plugin.common.MethodChannel;
+
+import android.os.AsyncTask;
+import android.os.Handler;
+import android.os.Looper;
+
+import java.security.SecureRandom;
 
 public class MainActivity extends FlutterFragmentActivity {
+    final String UTILS_CHANNEL = "com.cake_wallet/native_utils";
     
     @Override
     public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
         GeneratedPluginRegistrant.registerWith(flutterEngine);
+
+        MethodChannel utilsChannel =
+                new MethodChannel(flutterEngine.getDartExecutor().getBinaryMessenger(),
+                        UTILS_CHANNEL);
+
+        utilsChannel.setMethodCallHandler(this::handle);
+    }
+
+    private void handle(@NonNull MethodCall call, @NonNull MethodChannel.Result result) {
+        Handler handler = new Handler(Looper.getMainLooper());
+
+        try {
+            if (call.method.equals("sec_random")) {
+                int count = call.argument("count");
+                SecureRandom random = new SecureRandom();
+                byte bytes[] = new byte[count];
+                random.nextBytes(bytes);
+                handler.post(() -> result.success(bytes));
+            } else {
+                handler.post(() -> result.notImplemented());
+            }
+        } catch (Exception e) {
+            handler.post(() -> result.error("UNCAUGHT_ERROR", e.getMessage(), null));
+        }
     }
 }