a3962b2076
We're creating a 'pyosmocom' pypi module which contains a number of core Osmocom libraries / interfaces that are not specific to SIM card stuff contained here. The main modules moved in this initial step are pySim.tlv, pySim.utils and pySim.construct. utils is split, not all of the contents is unrelated to SIM Cards. The other two are moved completely. Change-Id: I4b63e45bcb0c9ba2424dacf85e0222aee735f411
40 lines
1.6 KiB
Python
40 lines
1.6 KiB
Python
# Generic code related to Secure Channel processing
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#
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# (C) 2023-2024 by Harald Welte <laforge@osmocom.org>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import abc
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from osmocom.utils import b2h, h2b, Hexstr
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from pySim.utils import ResTuple
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class SecureChannel(abc.ABC):
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@abc.abstractmethod
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def wrap_cmd_apdu(self, apdu: bytes) -> bytes:
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"""Wrap Command APDU according to specific Secure Channel Protocol."""
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pass
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@abc.abstractmethod
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def unwrap_rsp_apdu(self, sw: bytes, rsp_apdu: bytes) -> bytes:
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"""UnWrap Response-APDU according to specific Secure Channel Protocol."""
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pass
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def send_apdu_wrapper(self, send_fn: callable, pdu: Hexstr, *args, **kwargs) -> ResTuple:
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"""Wrapper function to wrap command APDU and unwrap repsonse APDU around send_apdu callable."""
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pdu_wrapped = b2h(self.wrap_cmd_apdu(h2b(pdu)))
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res, sw = send_fn(pdu_wrapped, *args, **kwargs)
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res_unwrapped = b2h(self.unwrap_rsp_apdu(h2b(sw), h2b(res)))
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return res_unwrapped, sw
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