add encryption (#1002)

* add encryption

* add doc

* add doc

* fix bug

python/fastdeploy/encryption/__init__.py

@@ -0,0 +1,16 @@
+# 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.
+from __future__ import absolute_import
+
+from .encryption import *

python/fastdeploy/encryption/encryption.py

@@ -0,0 +1,41 @@
+# 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.
+from .. import c_lib_wrap as C
+
+
+def generate_key():
+    """generate a key for encryption
+    :return: key(str)
+    """
+    return C.encryption.generate_key()
+
+
+def encrypt(input, key=None):
+    """Encrypt a input string with key.
+    :param: input: (str) The input str for encryption
+    :param: key: (str,optional) The key for encryption(if not given, generate automatically.)
+    :return: pair(str, str) [encrypted string, key]
+    """
+    if key is None:
+        key = generate_key()
+    return C.encryption.encrypt(input, key)
+
+
+def decrypt(cipher, key):
+    """Decrypt a input cipher with key.
+    :param: cipher: (str) The input str for decryption
+    :param: key: (str) The key for decryption
+    :return: str(The decrypted str)
+    """
+    return C.encryption.decrypt(cipher, key)