Open decrypted application/pgp-keys only in OpenKeychain

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

@@ -533,6 +533,11 @@ public class DecryptListFragment
             } else {
                 intent = new Intent(Intent.ACTION_VIEW);
                 intent.setDataAndType(outputUri, metadata.getMimeType());
+
+                if ("application/pgp-keys".equals(metadata.getMimeType())) {
+                    // bind Intent to this OpenKeychain, don't allow other apps to intercept here!
+                    intent.setPackage(getActivity().getPackageName());
+                }
             }
 
             intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);