1 files changed, 59 insertions, 0 deletions
diff --git a/osdf/utils/cipherUtils.py b/osdf/utils/cipherUtils.py
new file mode 100644
index 0000000..169f1a1
--- /dev/null
+++ b/osdf/utils/cipherUtils.py
@@ -0,0 +1,59 @@
+#
+# -------------------------------------------------------------------------
+#   Copyright (C) 2020 Wipro Limited.
+#
+#   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 Crypto.Cipher import AES
+from osdf.config.base import osdf_config
+from Crypto.Util.Padding import unpad
+from Crypto.Util.Padding import pad
+
+
+class AESCipher(object):
+    __instance = None
+
+    @staticmethod
+    def get_instance(key = None):
+        if AESCipher.__instance is None:
+            print("Creating the singleton instance")
+            AESCipher(key)
+        return AESCipher.__instance
+
+    def __init__(self, key=None):
+        if AESCipher.__instance is not None:
+            raise Exception("This class is a singleton!")
+        else:
+            AESCipher.__instance = self
+
+        self.bs = 32
+        if key is None:
+            key = osdf_config.deployment["appkey"]
+
+        self.key = key.encode()
+
+    def encrypt(self, data):
+        data = data.encode()
+        cipher = AES.new(self.key, AES.MODE_CBC)
+        ciphered_data = cipher.encrypt(pad(data, AES.block_size))
+        enc = (cipher.iv.hex())+(ciphered_data.hex())
+        return enc
+
+    def decrypt(self, enc):
+        iv = bytes.fromhex(enc[:32])
+        ciphered_data = bytes.fromhex(enc[32:])
+        cipher = AES.new(self.key, AES.MODE_CBC, iv=iv)
+        original_data = unpad(cipher.decrypt(ciphered_data), AES.block_size).decode()
+        return original_data