add encryption to verification responses as well

verification/lib/verification_bloc.dart

@@ -69,15 +69,26 @@ class VerificationBloc extends Bloc<VerificationEvent, VerificationState> {
           }
           if ((response?.verified ?? false) && !(response?.hasError ?? false)) {
             _verification = response;
-            await _verificationStore!.writeAsString(json.encode(_verification!.toMap));
+            final iv = IV.fromLength(16);
+            await _verificationStore!.writeAsString(
+                iv.base64 + _encrypter!.encrypt(json.encode(_verification!.toMap), iv: iv).base64);
             yield VerificationState.verified;
           } else if (((((await Connectivity().checkConnectivity()) == ConnectivityResult.none) ||
                   ((response?.hasError ?? false) &&
                       response!.error == VerificationErrorType.server)) &&
               (_verificationStore?.existsSync() ?? false))) {
             // get verification from local storage
-            final loaded =
-                VerificationResponse.fromMap(json.decode(await _verificationStore!.readAsString()));
+            String rawVerification;
+            final storeData = await _verificationStore!.readAsString();
+            final iv = IV.fromBase64(storeData.substring(0, 24));
+            final encrypted = Encrypted.fromBase64(storeData.substring(24));
+            try {
+              rawVerification = _encrypter!.decrypt(encrypted, iv: iv);
+            } catch (e) {
+              yield VerificationState.unverified;
+              return;
+            }
+            final loaded = VerificationResponse.fromMap(json.decode(rawVerification));
             if (loaded.timestamp.isAfter(DateTime.now().subtract(const Duration(minutes: 30)))) {
               _verification = loaded;
               yield VerificationState.verified;