diff --git a/identity/WritableCredential.h b/identity/WritableCredential.h
new file mode 100644
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--- /dev/null
+++ b/identity/WritableCredential.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2019, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SYSTEM_SECURITY_WRITABLE_CREDENTIAL_H_
+#define SYSTEM_SECURITY_WRITABLE_CREDENTIAL_H_
+
+#include <string>
+#include <vector>
+
+#include <android/security/identity/BnWritableCredential.h>
+
+#include <android/hardware/identity/1.0/IIdentityCredentialStore.h>
+#include <android/hardware/identity/1.0/types.h>
+
+namespace android {
+namespace security {
+namespace identity {
+
+using ::android::binder::Status;
+using ::android::hardware::identity::V1_0::IWritableIdentityCredential;
+using ::std::string;
+using ::std::vector;
+
+class WritableCredential : public BnWritableCredential {
+  public:
+    WritableCredential(const string& dataPath, const string& credentialName, const string& docType,
+                       size_t dataChunkSize, sp<IWritableIdentityCredential> halBinder);
+    ~WritableCredential();
+
+    // IWritableCredential overrides
+    Status getCredentialKeyCertificateChain(const vector<uint8_t>& challenge,
+                                            vector<uint8_t>* _aidl_return) override;
+
+    Status personalize(const vector<AccessControlProfileParcel>& accessControlProfiles,
+                       const vector<EntryNamespaceParcel>& entryNamespaces, int64_t secureUserId,
+                       vector<uint8_t>* _aidl_return) override;
+
+  private:
+    string dataPath_;
+    string credentialName_;
+    size_t dataChunkSize_;
+    sp<IWritableIdentityCredential> halBinder_;
+    vector<uint8_t> attestationCertificate_;
+
+    Status ensureAttestationCertificateExists(const vector<uint8_t>& challenge);
+};
+
+}  // namespace identity
+}  // namespace security
+}  // namespace android
+
+#endif  // SYSTEM_SECURITY_WRITABLE_CREDENTIAL_H_