Add the blocks module that encode/decode messages.

cryptography_s_des_exploring/sdes/blocks.py

@@ -0,0 +1,46 @@
+"""
+Encoding a message to the 8-bits blocks.
+Decoding a message from the 8-bits blocks.
+"""
+
+import base64
+
+
+def encode(message: str):
+    """
+    Encode the UTF-8 string into base64 and converts bytes to a list which element represent a byte in a binary.
+    """
+
+    encoded = base64.b64encode(message.encode('utf-8'))
+    return map(lambda c: format(c, '08b'), encoded)
+
+
+def decode(message: list):
+    """
+    Decode the list of binary string into bytes to decode this with base64 to get the UTF-8 string.
+    """
+
+    decoded_bytes = bytes(map(lambda c: int(c, 2), message))
+
+    return base64.b64decode(decoded_bytes).decode('utf-8')
+
+
+def encode_bytes(byte_list: list):
+    """
+    Encode the UTF-8 string into base64 and converts bytes to a list which element represent a byte in a binary.
+    """
+
+    byte_list = [int(b, 2) for b in byte_list]
+    byte_data = bytes(byte_list)
+    return base64.b64encode(byte_data)
+
+
+def decode_bytes(message: str):
+    """
+    Decode the list of binary string into bytes to decode this with base64 to get the UTF-8 string.
+    """
+
+    decoded = base64.b64decode(message)
+    byte_list = list(decoded)
+    return map(lambda b: format(b, '08b'), byte_list)
+