diff --git a/crypto/ext4crypt/Ext4CryptPie.h b/crypto/ext4crypt/Ext4CryptPie.h
new file mode 100644
index 0000000..6e2afa5
--- /dev/null
+++ b/crypto/ext4crypt/Ext4CryptPie.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+#include <map>
+#include <string>
+
+#include <cutils/multiuser.h>
+
+bool e4crypt_initialize_global_de();
+
+bool e4crypt_init_user0();
+/*bool e4crypt_vold_create_user_key(userid_t user_id, int serial, bool ephemeral);
+bool e4crypt_destroy_user_key(userid_t user_id);
+bool e4crypt_add_user_key_auth(userid_t user_id, int serial, const std::string& token,
+                               const std::string& secret);
+bool e4crypt_fixate_newest_user_key_auth(userid_t user_id);*/
+
+bool e4crypt_unlock_user_key(userid_t user_id, int serial, const std::string& token,
+                             const std::string& secret);
+//bool e4crypt_lock_user_key(userid_t user_id);
+
+bool e4crypt_prepare_user_storage(const std::string& volume_uuid, userid_t user_id, int serial,
+                                  int flags);
+/*bool e4crypt_destroy_user_storage(const std::string& volume_uuid, userid_t user_id, int flags);
+
+bool e4crypt_destroy_volume_keys(const std::string& volume_uuid);*/
+
+bool lookup_key_ref(const std::map<userid_t, std::string>& key_map, userid_t user_id,
+                           std::string* raw_ref);