136 lines
4.5 KiB
Python
136 lines
4.5 KiB
Python
# Pyrogram - Telegram MTProto API Client Library for Python
|
|
# Copyright (C) 2017-2018 Dan Tès <https://github.com/delivrance>
|
|
#
|
|
# This file is part of Pyrogram.
|
|
#
|
|
# Pyrogram is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU Lesser General Public License as published
|
|
# by the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# Pyrogram is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU Lesser General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public License
|
|
# along with Pyrogram. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
import logging
|
|
|
|
log = logging.getLogger(__name__)
|
|
|
|
try:
|
|
import tgcrypto
|
|
|
|
log.info("Using TgCrypto")
|
|
|
|
|
|
class AES:
|
|
# TODO: Use new tgcrypto function names
|
|
@classmethod
|
|
def ige256_encrypt(cls, data: bytes, key: bytes, iv: bytes) -> bytes:
|
|
return tgcrypto.ige_encrypt(data, key, iv)
|
|
|
|
@classmethod
|
|
def ige256_decrypt(cls, data: bytes, key: bytes, iv: bytes) -> bytes:
|
|
return tgcrypto.ige_decrypt(data, key, iv)
|
|
|
|
@staticmethod
|
|
def ctr256_encrypt(data: bytes, key: bytes, iv: bytearray, state: bytearray = None) -> bytes:
|
|
return tgcrypto.ctr_encrypt(data, key, iv, state or bytearray(1))
|
|
|
|
@staticmethod
|
|
def ctr256_decrypt(data: bytes, key: bytes, iv: bytearray, state: bytearray = None) -> bytes:
|
|
return tgcrypto.ctr_decrypt(data, key, iv, state or bytearray(1))
|
|
|
|
@staticmethod
|
|
def xor(a: bytes, b: bytes) -> bytes:
|
|
return int.to_bytes(
|
|
int.from_bytes(a, "big") ^ int.from_bytes(b, "big"),
|
|
len(a),
|
|
"big",
|
|
)
|
|
except ImportError:
|
|
import pyaes
|
|
|
|
log.warning(
|
|
"TgCrypto is missing! "
|
|
"Pyrogram will work the same, but at a much slower speed. "
|
|
"More info: https://docs.pyrogram.ml/resources/TgCrypto"
|
|
)
|
|
|
|
|
|
class AES:
|
|
@classmethod
|
|
def ige256_encrypt(cls, data: bytes, key: bytes, iv: bytes) -> bytes:
|
|
return cls.ige(data, key, iv, True)
|
|
|
|
@classmethod
|
|
def ige256_decrypt(cls, data: bytes, key: bytes, iv: bytes) -> bytes:
|
|
return cls.ige(data, key, iv, False)
|
|
|
|
@classmethod
|
|
def ctr256_encrypt(cls, data: bytes, key: bytes, iv: bytearray, state: bytearray = None) -> bytes:
|
|
return cls.ctr(data, key, iv, state or bytearray(1))
|
|
|
|
@classmethod
|
|
def ctr256_decrypt(cls, data: bytes, key: bytes, iv: bytearray, state: bytearray = None) -> bytes:
|
|
return cls.ctr(data, key, iv, state or bytearray(1))
|
|
|
|
@staticmethod
|
|
def xor(a: bytes, b: bytes) -> bytes:
|
|
return int.to_bytes(
|
|
int.from_bytes(a, "big") ^ int.from_bytes(b, "big"),
|
|
len(a),
|
|
"big",
|
|
)
|
|
|
|
@classmethod
|
|
def ige(cls, data: bytes, key: bytes, iv: bytes, encrypt: bool) -> bytes:
|
|
cipher = pyaes.AES(key)
|
|
|
|
iv_1 = iv[:16]
|
|
iv_2 = iv[16:]
|
|
|
|
data = [data[i: i + 16] for i in range(0, len(data), 16)]
|
|
|
|
if encrypt:
|
|
for i, chunk in enumerate(data):
|
|
iv_1 = data[i] = cls.xor(cipher.encrypt(cls.xor(chunk, iv_1)), iv_2)
|
|
iv_2 = chunk
|
|
else:
|
|
for i, chunk in enumerate(data):
|
|
iv_2 = data[i] = cls.xor(cipher.decrypt(cls.xor(chunk, iv_2)), iv_1)
|
|
iv_1 = chunk
|
|
|
|
return b"".join(data)
|
|
|
|
@classmethod
|
|
def ctr(cls, data: bytes, key: bytes, iv: bytearray, state: bytearray) -> bytes:
|
|
cipher = pyaes.AES(key)
|
|
|
|
out = bytearray(data)
|
|
chunk = cipher.encrypt(iv)
|
|
|
|
for i in range(0, len(data), 16):
|
|
for j in range(0, min(len(data) - i, 16)):
|
|
out[i + j] ^= chunk[state[0]]
|
|
|
|
state[0] += 1
|
|
|
|
if state[0] >= 16:
|
|
state[0] = 0
|
|
|
|
if state[0] == 0:
|
|
for k in range(15, -1, -1):
|
|
try:
|
|
iv[k] += 1
|
|
break
|
|
except ValueError:
|
|
iv[k] = 0
|
|
|
|
chunk = cipher.encrypt(iv)
|
|
|
|
return out
|