First attempt at TelegramClient. Added fixes and doc

crypto/auth_key.py

@@ -0,0 +1,30 @@
+# This file is based on TLSharp
+# https://github.com/sochix/TLSharp/blob/master/TLSharp.Core/MTProto/Crypto/AuthKey.cs
+import utils.helpers as utils
+from utils.binary_writer import BinaryWriter
+from utils.binary_reader import BinaryReader
+
+
+class AuthKey:
+    def __init__(self, gab=None, data=None):
+        if gab:
+            self.key = utils.get_byte_array(gab, signed=False)
+        elif data:
+            self.key = data
+        else:
+            raise AssertionError('Either a gab integer or data bytes array must be provided')
+
+        with BinaryReader(utils.sha1(self.key)) as reader:
+            self.aux_hash = reader.read_long(signed=False)
+            reader.read(4)
+            self.key_id = reader.read_long(signed=False)
+
+    def calc_new_nonce_hash(self, new_nonce, number):
+        """Calculates the new nonce hash based on the current class fields' values"""
+        with BinaryWriter() as writer:
+            writer.write(new_nonce)
+            writer.write_byte(number)
+            writer.write_long(self.aux_hash, signed=False)
+
+            new_nonce_hash = utils.sha1(writer.get_bytes())[4:20]
+            return new_nonce_hash