#!/usr/bin/python
#
# spreadspace avr utils
#
#
# Copyright (C) 2013-2016 Christian Pointner <equinox@spreadspace.org>
#
# This file is part of spreadspace avr utils.
#
# spreadspace avr utils 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
# any later version.
#
# spreadspace avr utils 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 spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
#

import binascii
from cryptography.hazmat.primitives.ciphers.aead import ChaCha20Poly1305

hdr = "hello world!"
body_enc = binascii.unhexlify("5535BB923FB4BDCA401D3AE05C85FF314BD22423FE339CD00259551AECA534FABBEB16B39CC9AC14DF")

key = binascii.unhexlify("7043b69bde20446661ba579e83fda0830e3e61c95b5ac8deeb79973ba0df02d8")
iv = binascii.unhexlify("6fac1c6a94a5788761cf9ecd")

cipher = ChaCha20Poly1305(key)
msg = cipher.decrypt(iv, body_enc, hdr)

print(str(msg))