add encryption (#1002)

* add encryption

* add doc

* add doc

* fix bug

fastdeploy/encryption/include/model_code.h

@@ -0,0 +1,43 @@
+//   Copyright (c) 2022 PaddlePaddle Authors. 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.
+#pragma once
+
+#ifndef DYGRAPH_DEPLOY_CPP_ENCRYPTION_INCLUDE_MODEL_CODE_H_
+#define DYGRAPH_DEPLOY_CPP_ENCRYPTION_INCLUDE_MODEL_CODE_H_
+namespace fastdeploy {
+#ifdef __cplusplus
+extern  "C" {
+#endif
+
+enum  {
+    CODE_OK                         = 0,
+    CODE_OPEN_FAILED                = 100,
+    CODE_READ_FILE_PTR_IS_NULL      = 101,
+    CODE_AES_GCM_ENCRYPT_FIALED     = 102,
+    CODE_AES_GCM_DECRYPT_FIALED     = 103,
+    CODE_KEY_NOT_MATCH              = 104,
+    CODE_KEY_LENGTH_ABNORMAL        = 105,
+    CODE_NOT_EXIST_DIR              = 106,
+    CODE_FILES_EMPTY_WITH_DIR       = 107,
+    CODE_MODEL_FILE_NOT_EXIST       = 108,
+    CODE_PARAMS_FILE_NOT_EXIST      = 109,
+    CODE_MODEL_YML_FILE_NOT_EXIST   = 110,
+    CODE_MKDIR_FAILED               = 111
+};
+
+#ifdef __cplusplus
+}
+#endif
+}  // namespace fastdeploy
+#endif  // DYGRAPH_DEPLOY_CPP_ENCRYPTION_INCLUDE_MODEL_CODE_H_