135 lines
4.5 KiB
Python
135 lines
4.5 KiB
Python
# Pyrogram - Telegram MTProto API Client Library for Python
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# Copyright (C) 2017-2020 Dan <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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log = logging.getLogger(__name__)
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try:
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import tgcrypto
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log.info("Using TgCrypto")
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class AES:
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@classmethod
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def ige256_encrypt(cls, data: bytes, key: bytes, iv: bytes) -> bytes:
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return tgcrypto.ige256_encrypt(data, key, iv)
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@classmethod
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def ige256_decrypt(cls, data: bytes, key: bytes, iv: bytes) -> bytes:
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return tgcrypto.ige256_decrypt(data, key, iv)
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@staticmethod
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def ctr256_encrypt(data: bytes, key: bytes, iv: bytearray, state: bytearray = None) -> bytes:
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return tgcrypto.ctr256_encrypt(data, key, iv, state or bytearray(1))
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@staticmethod
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def ctr256_decrypt(data: bytes, key: bytes, iv: bytearray, state: bytearray = None) -> bytes:
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return tgcrypto.ctr256_decrypt(data, key, iv, state or bytearray(1))
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@staticmethod
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def xor(a: bytes, b: bytes) -> bytes:
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return int.to_bytes(
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int.from_bytes(a, "big") ^ int.from_bytes(b, "big"),
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len(a),
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"big",
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)
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except ImportError:
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import pyaes
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log.warning(
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"TgCrypto is missing! "
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"Pyrogram will work the same, but at a much slower speed. "
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"More info: https://docs.pyrogram.org/topics/tgcrypto"
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)
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class AES:
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@classmethod
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def ige256_encrypt(cls, data: bytes, key: bytes, iv: bytes) -> bytes:
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return cls.ige(data, key, iv, True)
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@classmethod
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def ige256_decrypt(cls, data: bytes, key: bytes, iv: bytes) -> bytes:
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return cls.ige(data, key, iv, False)
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@classmethod
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def ctr256_encrypt(cls, data: bytes, key: bytes, iv: bytearray, state: bytearray = None) -> bytes:
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return cls.ctr(data, key, iv, state or bytearray(1))
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@classmethod
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def ctr256_decrypt(cls, data: bytes, key: bytes, iv: bytearray, state: bytearray = None) -> bytes:
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return cls.ctr(data, key, iv, state or bytearray(1))
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@staticmethod
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def xor(a: bytes, b: bytes) -> bytes:
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return int.to_bytes(
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int.from_bytes(a, "big") ^ int.from_bytes(b, "big"),
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len(a),
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"big",
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)
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@classmethod
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def ige(cls, data: bytes, key: bytes, iv: bytes, encrypt: bool) -> bytes:
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cipher = pyaes.AES(key)
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iv_1 = iv[:16]
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iv_2 = iv[16:]
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data = [data[i: i + 16] for i in range(0, len(data), 16)]
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if encrypt:
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for i, chunk in enumerate(data):
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iv_1 = data[i] = cls.xor(cipher.encrypt(cls.xor(chunk, iv_1)), iv_2)
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iv_2 = chunk
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else:
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for i, chunk in enumerate(data):
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iv_2 = data[i] = cls.xor(cipher.decrypt(cls.xor(chunk, iv_2)), iv_1)
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iv_1 = chunk
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return b"".join(data)
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@classmethod
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def ctr(cls, data: bytes, key: bytes, iv: bytearray, state: bytearray) -> bytes:
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cipher = pyaes.AES(key)
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out = bytearray(data)
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chunk = cipher.encrypt(iv)
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for i in range(0, len(data), 16):
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for j in range(0, min(len(data) - i, 16)):
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out[i + j] ^= chunk[state[0]]
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state[0] += 1
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if state[0] >= 16:
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state[0] = 0
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if state[0] == 0:
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for k in range(15, -1, -1):
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try:
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iv[k] += 1
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break
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except ValueError:
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iv[k] = 0
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chunk = cipher.encrypt(iv)
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return out
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