diff --git a/identity/Credential.h b/identity/Credential.h
index 7f08515..a76f3cc 100644
--- a/identity/Credential.h
+++ b/identity/Credential.h
@@ -50,6 +50,7 @@
     ~Credential();
 
     Status ensureOrReplaceHalBinder();
+    void writableCredentialPersonalized();
 
     // ICredential overrides
     Status createEphemeralKeyPair(vector<uint8_t>* _aidl_return) override;
@@ -94,12 +95,13 @@
     HardwareInformation hwInfo_;
     sp<IIdentityCredentialStore> halStoreBinder_;
 
-    const AuthKeyData* selectedAuthKey_ = nullptr;
     uint64_t selectedChallenge_ = 0;
 
     sp<IIdentityCredential> halBinder_;
     int halApiVersion_;
 
+    bool ensureChallenge();
+
     ssize_t
     calcExpectedDeviceNameSpacesSize(const vector<uint8_t>& requestMessage,
                                      const vector<RequestNamespaceParcel>& requestNamespaces,