diff --git a/lib/shared/crypto-utils.js b/lib/shared/crypto-utils.js
new file mode 100644
--- /dev/null
+++ b/lib/shared/crypto-utils.js
@@ -0,0 +1,13 @@
+//@flow
+
+import type { OLMOneTimeKeys } from '../types/crypto-types';
+import { values } from '../utils/objects.js';
+
+function getOneTimeKeyValues(
+  oneTimeKeys: OLMOneTimeKeys,
+): $ReadOnlyArray<string> {
+  const keys: $ReadOnlyArray<string> = values(oneTimeKeys.curve25519);
+  return keys;
+}
+
+export { getOneTimeKeyValues };