deactivate screenshots in new PassphraseDialogActivity

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/PassphraseDialogActivity.java

@@ -31,6 +31,7 @@ import android.support.v4.app.FragmentActivity;
 import android.view.KeyEvent;
 import android.view.LayoutInflater;
 import android.view.View;
+import android.view.WindowManager;
 import android.view.inputmethod.EditorInfo;
 import android.view.inputmethod.InputMethodManager;
 import android.widget.Button;
@@ -64,6 +65,15 @@ public class PassphraseDialogActivity extends FragmentActivity {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
+        // do not allow screenshots of passphrase input
+        // to prevent "too easy" passphrase theft by root apps
+        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.HONEYCOMB) {
+            getWindow().setFlags(
+                    WindowManager.LayoutParams.FLAG_SECURE,
+                    WindowManager.LayoutParams.FLAG_SECURE
+            );
+        }
+
         // this activity itself has no content view (see manifest)
 
         long keyId = getIntent().getLongExtra(EXTRA_SECRET_KEY_ID, 0);

settings.gradle

@@ -15,3 +15,4 @@ include ':extern:KeybaseLib:Lib'
 include ':extern:TokenAutoComplete:library'
 include ':extern:openpgp-card-nfc-lib:library'
 include ':extern:safeslinger-exchange'
+include ':OpenKeychain-Test'