Remove underscore from module names

telethon/crypto/authkey.py

@@ -0,0 +1,40 @@
+"""
+This module holds the AuthKey class.
+"""
+import struct
+from hashlib import sha1
+
+from ..extensions import BinaryReader
+
+
+class AuthKey:
+    """
+    Represents an authorization key, used to encrypt and decrypt
+    messages sent to Telegram's data centers.
+    """
+    def __init__(self, data):
+        """
+        Initializes a new authorization key.
+
+        :param data: the data in bytes that represent this auth key.
+        """
+        self.key = data
+
+        with BinaryReader(sha1(self.key).digest()) 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 attributes.
+
+        :param new_nonce: the new nonce to be hashed.
+        :param number: number to prepend before the hash.
+        :return: the hash for the given new nonce.
+        """
+        new_nonce = new_nonce.to_bytes(32, 'little', signed=True)
+        data = new_nonce + struct.pack('<BQ', number, self.aux_hash)
+
+        # Calculates the message key from the given data
+        return int.from_bytes(sha1(data).digest()[4:20], 'little', signed=True)