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# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2020 Maxim Devaev <[email protected]> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program 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 General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
# ========================================================================== #
import os
import passlib.crypto.des
# =====
def rfb_make_challenge() -> bytes:
return os.urandom(16)
def rfb_encrypt_challenge(challenge: bytes, passwd: bytes) -> bytes:
assert len(challenge) == 16
key = _make_key(passwd)
return (
passlib.crypto.des.des_encrypt_block(key, challenge[:8])
+ passlib.crypto.des.des_encrypt_block(key, challenge[8:])
)
def _make_key(passwd: bytes) -> bytes:
passwd = (passwd + b"\0" * 8)[:8]
key: list[int] = []
for ch in passwd:
btgt = 0
for index in range(8):
if ch & (1 << index):
btgt = btgt | (1 << 7 - index)
key.append(btgt)
return bytes(key)
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