diff --git a/native/utils/crypto-utils.js b/native/utils/crypto-utils.js
new file mode 100644
--- /dev/null
+++ b/native/utils/crypto-utils.js
@@ -0,0 +1,52 @@
+// @flow
+
+import * as React from 'react';
+
+import {
+  getOlmNotifsSessionInitializationData,
+  getOlmNotifsSessionInitializationDataActionTypes,
+} from 'lib/actions/user-actions.js';
+import {
+  useServerCall,
+  useDispatchActionPromise,
+} from 'lib/utils/action-utils.js';
+
+import { commCoreModule } from '../native-modules.js';
+
+function useInitialNotificationsEncryptedMessage(): (
+  oneTimeKeysCount: number,
+) => Promise<string> {
+  const callGetOlmNotifsSessionInitializationData = useServerCall(
+    getOlmNotifsSessionInitializationData,
+  );
+  const dispatchActionPromise = useDispatchActionPromise();
+
+  return React.useCallback(
+    async (oneTimeKeysCount: number) => {
+      const olmNotifsSessionDataPromise =
+        callGetOlmNotifsSessionInitializationData({ oneTimeKeysCount });
+      await dispatchActionPromise(
+        getOlmNotifsSessionInitializationDataActionTypes,
+        olmNotifsSessionDataPromise,
+      );
+
+      const { signedIdentityKeysBlob, prekey, oneTimeKeys } =
+        await olmNotifsSessionDataPromise;
+
+      const { notificationIdentityPublicKeys } = JSON.parse(
+        signedIdentityKeysBlob.payload,
+      );
+
+      await commCoreModule.initializeNotificationsSession(
+        JSON.stringify(notificationIdentityPublicKeys),
+        prekey,
+        oneTimeKeys,
+      );
+
+      return await commCoreModule.generateInitialNotificationsEncryptedMessage();
+    },
+    [callGetOlmNotifsSessionInitializationData, dispatchActionPromise],
+  );
+}
+
+export { useInitialNotificationsEncryptedMessage };