mirror of https://gerrit.osmocom.org/pysim
38 lines
1.6 KiB
Python
38 lines
1.6 KiB
Python
# Generic code related to Secure Channel processing
|
|
#
|
|
# (C) 2023-2024 by Harald Welte <laforge@osmocom.org>
|
|
#
|
|
# 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 2 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 <http://www.gnu.org/licenses/>.
|
|
|
|
import abc
|
|
from pySim.utils import b2h, h2b, ResTuple, Hexstr
|
|
|
|
class SecureChannel(abc.ABC):
|
|
@abc.abstractmethod
|
|
def wrap_cmd_apdu(self, apdu: bytes) -> bytes:
|
|
"""Wrap Command APDU according to specific Secure Channel Protocol."""
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def unwrap_rsp_apdu(self, sw: bytes, rsp_apdu: bytes) -> bytes:
|
|
"""UnWrap Response-APDU according to specific Secure Channel Protocol."""
|
|
pass
|
|
|
|
def send_apdu_wrapper(self, send_fn: callable, pdu: Hexstr, *args, **kwargs) -> ResTuple:
|
|
"""Wrapper function to wrap command APDU and unwrap repsonse APDU around send_apdu callable."""
|
|
pdu_wrapped = b2h(self.wrap_cmd_apdu(h2b(pdu)))
|
|
res, sw = send_fn(pdu_wrapped, *args, **kwargs)
|
|
res_unwrapped = b2h(self.unwrap_rsp_apdu(h2b(sw), h2b(res)))
|
|
return res_unwrapped, sw
|