diff --git a/crypto/unexportable_key.h b/crypto/unexportable_key.h
index 61c25be..63acf4b6 100644
--- a/crypto/unexportable_key.h
+++ b/crypto/unexportable_key.h
@@ -191,6 +191,14 @@
 CRYPTO_EXPORT std::unique_ptr<VirtualUnexportableKeyProvider>
 GetVirtualUnexportableKeyProvider_DO_NOT_USE_METRICS_ONLY();
 
+// `GetSoftwareUnsecureUnexportableKeyProvider()` returns a mock software
+// implementation of `UnexportableKeyProvider` that can be used on platforms
+// that do not have a native secure implementation.
+// This should be used for development purposes only since these keys are not
+// backed by hardware and are not stored securely.
+CRYPTO_EXPORT std::unique_ptr<UnexportableKeyProvider>
+GetSoftwareUnsecureUnexportableKeyProvider();
+
 namespace internal {
 
 CRYPTO_EXPORT void SetUnexportableKeyProviderForTesting(