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# Pyrogram - Telegram MTProto API Client Library for Python

# Copyright (C) 2017-2019 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/>.

from hashlib import sha256

class KDF:

def __new__(cls, auth_key: bytes, msg_key: bytes, outgoing: bool) -> tuple:

# https://core.telegram.org/mtproto/description#defining-aes-key-and-initialization-vector

x = 0 if outgoing else 8

sha256_a = sha256(msg_key + auth_key[x: x + 36]).digest()

sha256_b = sha256(auth_key[x + 40:x + 76] + msg_key).digest() # 76 = 40 + 36

aes_key = sha256_a[:8] + sha256_b[8:24] + sha256_a[24:32]

aes_iv = sha256_b[:8] + sha256_a[8:24] + sha256_b[24:32]

return aes_key, aes_iv