Add digital signature func

Author: huy

README.md

@@ -1 +1,7 @@
-# digital-signature-python
+# Digital Signature Python
+
+Argorithm: hmac-sha256
+
+Run: ```python3 ./main/main.py```
+
+Version: python3.x

main/main.py

@@ -0,0 +1,10 @@
+from util.digital_signature import DigitalSignature
+
+if __name__ == '__main__':
+    signature1 = DigitalSignature(data='abc',
+                                  secret='6a87c625-e186-43bc-8160-b6e80e1a910b').get_signature()
+
+    signature2 = DigitalSignature(data='abc',
+                                  secret='6a87c625-e186-43bc-8160-b6e80e1a910b').get_signature()
+
+    print('{}\n{}'.format(signature1, signature2))

main/util/digital_signature.py

@@ -0,0 +1,28 @@
+import hashlib
+import hmac
+
+
+class DigitalSignature:
+    __data: bytes
+    __secret: bytes
+    __encode: str
+
+    def __init__(self,
+                 data: str,
+                 secret: str,
+                 encode='utf-8'):
+        self.__encode = encode
+        self.__data = bytes(data, self.__encode)
+        self.__secret = bytes(secret, self.__encode)
+
+    def get_signature(self):
+        signature = self.__calculate_hmac(secret=self.__secret,
+                                          data=self.__data)
+
+        return signature.hexdigest()
+
+    @staticmethod
+    def __calculate_hmac(secret: bytes,
+                         data: bytes,
+                         algorithm=hashlib.sha256):
+        return hmac.new(secret, data, algorithm)