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diff --git a/srcs/key_handler.h b/srcs/key_handler.h
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+/*
+ *  Copyright (c) 2000 - 2015 Samsung Electronics Co., Ltd All Rights Reserved
+ *
+ *  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
+ *
+ *
+ * @file        key_handler.h
+ * @author      Dongsun Lee (ds73.lee@samsung.com)
+ * @version     1.0
+ * @brief       a header for key manupulatation.
+ */
+
+
+
+#ifndef __TIZEN_CORE_WAE_KEY_HANDLER_H
+#define __TIZEN_CORE_WAE_KEY_HANDLER_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stddef.h>
+
+#define APP_DEK_ALIAS_PFX "APP_DEK_"
+#define APP_DEK_LOADING_DONE_ALIAS "APP_DEKS_LOADING_FINISHED"
+
+#define DEK_LEN 32
+#define MAX_ALIAS_LEN 256
+#define MAX_PKGID_LEN 256
+#define MAX_PATH_LEN  512
+#define MAX_CACHE_SIZE 100
+
+
+#define RANDOM_FILE        "/dev/urandom"
+#define APP_DEK_FILE_PFX   "WAE_APP_DEK"
+#define APP_DEK_KEK_ALIAS  "WAE_APP_DEK_KEK"
+
+#define WAE_TRUE  1
+#define WAE_FALSE 0
+
+void _initialize_cache();
+unsigned char* _get_app_dek_from_cache(const char* pkgId);
+void _add_app_dek_to_cache(const char* pkgId, unsigned char* dek);
+void _remove_app_dek_from_cache(const char* pkgId);
+int _get_random(size_t length, unsigned char* random);
+void _get_alias(const char* pPkgId, char* alias, size_t buff_len);
+void _get_dek_kek_alias(char* alias, size_t buff_len);
+void _get_dek_loading_done_alias(char* alias, size_t buff_len);
+const char* _get_dek_kek_pub_key_path();
+const char* _get_dek_kek_pri_key_path();
+const char* _get_dek_store_path();
+int _add_dek_to_key_manager(const char* pPkgId, const unsigned char* pDek, size_t len);
+int _get_preloaded_app_dek_file_path(const char* pPkgId, char *path);
+int _extract_pkg_id_from_file_name(const char* fileName, char* pkgId);
+int _read_encrypted_app_dek_from_file(const char* pPkgId, unsigned char** encrypted_app_dek, size_t*len);
+int _write_encrypted_app_dek_to_file(const char* pPkgId, const unsigned char* encrypted_app_dek, size_t len);
+int _read_from_file(const char* path, unsigned char** data, size_t* len);
+int _write_to_file(const char* path, const unsigned char* data, size_t len);
+int _get_app_dek_kek_from_key_manager(unsigned char** ppDekKek, size_t* kekLen);
+int _get_app_deks_loaded();
+int _set_app_deks_loaded();
+int _clear_app_deks_loaded();
+
+int get_app_dek(const char* pPkgId, unsigned char** ppDek, size_t *dekLen);
+int create_app_dek(const char* pPkgId, unsigned char** ppDek, size_t *dekLen);
+int get_preloaded_app_dek(const char* pPkgId, unsigned char** ppDek, size_t* dekLen);
+int create_preloaded_app_dek(const char* pPkgId, unsigned char** ppDek, size_t *dekLen);
+int load_preloaded_app_deks(int reload);
+int remove_app_dek(const char* pPkgId);
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* __TIZEN_CORE_WAE_KEY_HANDLER_H */
+