81 lines
2.4 KiB
Python
81 lines
2.4 KiB
Python
# Pyrogram - Telegram MTProto API Client Library for Python
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# Copyright (C) 2017-2019 Dan Tès <https://github.com/delivrance>
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#
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# This file is part of Pyrogram.
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#
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# Pyrogram is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Pyrogram is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with Pyrogram. If not, see <http://www.gnu.org/licenses/>.
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import logging
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import os
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from struct import pack, unpack
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from .tcp import TCP
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from ....crypto.aes import AES
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log = logging.getLogger(__name__)
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class TCPIntermediateO(TCP):
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RESERVED = (b"HEAD", b"POST", b"GET ", b"OPTI", b"\xee" * 4)
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def __init__(self, ipv6: bool, proxy: dict):
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super().__init__(ipv6, proxy)
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self.encrypt = None
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self.decrypt = None
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async def connect(self, address: tuple):
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await super().connect(address)
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while True:
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nonce = bytearray(os.urandom(64))
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if (nonce[0] != b"\xef"
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and nonce[:4] not in self.RESERVED
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and nonce[4:4] != b"\x00" * 4):
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nonce[56] = nonce[57] = nonce[58] = nonce[59] = 0xee
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break
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temp = bytearray(nonce[55:7:-1])
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self.encrypt = (nonce[8:40], nonce[40:56], bytearray(1))
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self.decrypt = (temp[0:32], temp[32:48], bytearray(1))
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nonce[56:64] = AES.ctr256_encrypt(nonce, *self.encrypt)[56:64]
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await super().send(nonce)
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async def send(self, data: bytes, *args):
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await super().send(
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AES.ctr256_encrypt(
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pack("<i", len(data)) + data,
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*self.encrypt
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)
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)
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async def recv(self, length: int = 0) -> bytes or None:
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length = await super().recv(4)
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if length is None:
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return None
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length = AES.ctr256_decrypt(length, *self.decrypt)
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data = await super().recv(unpack("<i", length)[0])
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if data is None:
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return None
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return AES.ctr256_decrypt(data, *self.decrypt)
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