From 74ec6391d92fc1ee75b738a4af74ae5e47f494f4 Mon Sep 17 00:00:00 2001 From: Lonami Exo Date: Fri, 24 Nov 2017 19:05:18 +0100 Subject: [PATCH] Fix-up security assertion (b42b4bb for #453) --- telethon/network/authenticator.py | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/telethon/network/authenticator.py b/telethon/network/authenticator.py index 8c508ef9..00a28fdf 100644 --- a/telethon/network/authenticator.py +++ b/telethon/network/authenticator.py @@ -113,8 +113,10 @@ def _do_authentication(connection): key, iv = utils.generate_key_data_from_nonce( res_pq.server_nonce, new_nonce ) - if server_dh_params.encrypted_answer % 16 != 0: - raise SecurityError('AES block size missmatch') + if len(server_dh_params.encrypted_answer) % 16 != 0: + # See PR#453 + raise SecurityError('AES block size mismatch') + plain_text_answer = AES.decrypt_ige( server_dh_params.encrypted_answer, key, iv )