add encryption (#1002)

* add encryption

* add doc

* add doc

* fix bug

fastdeploy/encryption/encryption_pybind.cc

@@ -0,0 +1,30 @@
+// 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.
+
+#include "fastdeploy/pybind/main.h"
+
+namespace fastdeploy {
+
+void BindEncryption(pybind11::module& m) {
+  m.def("encrypt", [](const std::string& input, const std::string& key) {
+       return Encrypt(input, key);
+  });
+  m.def("decrypt", [](const std::string& cipher, const std::string& key) {
+       return Decrypt(cipher, key);
+  });
+  m.def("generate_key", []() {
+       return GenerateRandomKey();
+  });
+}
+}  // namespace fastdeploy