diff --git a/keystore/keystore.h b/keystore/keystore.h
new file mode 100644
index 0000000..5ae3d24
--- /dev/null
+++ b/keystore/keystore.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2009 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 __KEYSTORE_H__
+#define __KEYSTORE_H__
+
+// note state values overlap with ResponseCode for the purposes of the state() API
+enum State {
+    STATE_NO_ERROR      = 1,
+    STATE_LOCKED        = 2,
+    STATE_UNINITIALIZED = 3,
+};
+
+enum ResponseCode {
+    NO_ERROR          =  STATE_NO_ERROR, // 1
+    LOCKED            =  STATE_LOCKED, // 2
+    UNINITIALIZED     =  STATE_UNINITIALIZED, // 3
+    SYSTEM_ERROR      =  4,
+    PROTOCOL_ERROR    =  5,
+    PERMISSION_DENIED =  6,
+    KEY_NOT_FOUND     =  7,
+    VALUE_CORRUPTED   =  8,
+    UNDEFINED_ACTION  =  9,
+    WRONG_PASSWORD_0  = 10,
+    WRONG_PASSWORD_1  = 11,
+    WRONG_PASSWORD_2  = 12,
+    WRONG_PASSWORD_3  = 13, // MAX_RETRY = 4
+};
+
+#endif