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commands: get rid of cla4lchan

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The send_apdu* methods now support lchan patching, so there is no longer
a need for computing the class byte manually (which is prone get forgotten)
before calling a send_apdu*. It is now enough to supply an APDU that has
a class byte with the default channel selected. This also means we do not
need cla4lchan anymore, so let's restruture the code and get rid of it
completely.

Related: OS#6531
Change-Id: Ia795f3c16a8875484fce3b44e61497d5aa52b447
This commit is contained in:
Philipp Maier
2024-08-28 12:34:54 +02:00
parent caabee4ccb
commit d8637f3a70
2 changed files with 11 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
pySim/commands.py
View File

@@ -81,8 +81,8 @@ class SimCardCommands:
@property
def cla_byte(self) -> Hexstr:
"""Return the (cached) patched default CLA byte for this card."""
return self._cla4lchan
"""Return the lchan patched default CLA value for this card."""
return cla_with_lchan(self._cla_byte, self.lchan_nr)
@property
def max_cmd_len(self) -> int:
@@ -96,19 +96,6 @@ class SimCardCommands:
def cla_byte(self, new_val: Hexstr):
"""Set the (raw, without lchan) default CLA value for this card."""
self._cla_byte = new_val
# compute cached result
self._cla4lchan = cla_with_lchan(self._cla_byte, self.lchan_nr)
def cla4lchan(self, cla: Hexstr) -> Hexstr:
"""Compute the lchan-patched value of the given CLA value. If no CLA
value is provided as argument, the lchan-patched version of the SimCardCommands._cla_byte
value is used. Most commands will use the latter, while some wish to override it and
can pass it as argument here."""
if not cla:
# return cached result to avoid re-computing this over and over again
return self._cla4lchan
else:
return cla_with_lchan(cla, self.lchan_nr)
def send_apdu(self, pdu: Hexstr, apply_lchan:bool = True) -> ResTuple:
"""Sends an APDU and auto fetch response data
@@ -122,7 +109,7 @@ class SimCardCommands:
sw : string (in hex) of status word (ex. "9000")
"""
if apply_lchan:
pdu = self.cla4lchan(pdu[0:2]) + pdu[2:]
pdu = cla_with_lchan(pdu[0:2], self.lchan_nr) + pdu[2:]
if self.scp:
return self.scp.send_apdu_wrapper(self._tp.send_apdu, pdu)
else:
@@ -142,7 +129,7 @@ class SimCardCommands:
sw : string (in hex) of status word (ex. "9000")
"""
if apply_lchan:
pdu = self.cla4lchan(pdu[0:2]) + pdu[2:]
pdu = cla_with_lchan(pdu[0:2], self.lchan_nr) + pdu[2:]
if self.scp:
return self.scp.send_apdu_wrapper(self._tp.send_apdu_checksw, pdu, sw)
else:
@@ -517,9 +504,9 @@ class SimCardCommands:
# TS 102 221 Section 11.3.1 low-level helper
def _retrieve_data(self, tag: int, first: bool = True) -> ResTuple:
if first:
pdu = self.cla4lchan('80') + 'cb008001%02x' % (tag)
pdu = '80cb008001%02x' % (tag)
else:
pdu = self.cla4lchan('80') + 'cb000000'
pdu = '80cb000000'
return self.send_apdu_checksw(pdu)
def retrieve_data(self, ef: Path, tag: int) -> ResTuple:
@@ -549,7 +536,7 @@ class SimCardCommands:
p1 = 0x00
if isinstance(data, (bytes, bytearray)):
data = b2h(data)
pdu = self.cla4lchan('80') + 'db00%02x%02x%s' % (p1, len(data)//2, data)
pdu = '80db00%02x%02x%s' % (p1, len(data)//2, data)
return self.send_apdu_checksw(pdu)
def set_data(self, ef, tag: int, value: str, verify: bool = False, conserve: bool = False) -> ResTuple:
@@ -592,7 +579,7 @@ class SimCardCommands:
if len(rand) != 32:
raise ValueError('Invalid rand')
self.select_path(['3f00', '7f20'])
return self.send_apdu_checksw(self.cla4lchan('a0') + '88000010' + rand, sw='9000')
return self.send_apdu_checksw('a088000010' + rand, sw='9000')
def authenticate(self, rand: Hexstr, autn: Hexstr, context: str = '3g') -> ResTuple:
"""Execute AUTHENTICATE (USIM/ISIM).
@@ -625,7 +612,7 @@ class SimCardCommands:
def status(self) -> ResTuple:
"""Execute a STATUS command as per TS 102 221 Section 11.1.2."""
return self.send_apdu_checksw(self.cla4lchan('80') + 'F2000000')
return self.send_apdu_checksw('80F2000000')
def deactivate_file(self) -> ResTuple:
"""Execute DECATIVATE FILE command as per TS 102 221 Section 11.1.14."""
@@ -645,7 +632,7 @@ class SimCardCommands:
def resize_file(self, payload: Hexstr) -> ResTuple:
"""Execute RESIZE FILE command as per TS 102 222 Section 6.10"""
return self.send_apdu_checksw(self.cla4lchan('80') + 'd40000%02x%s' % (len(payload)//2, payload))
return self.send_apdu_checksw('80d40000%02x%s' % (len(payload)//2, payload))
def delete_file(self, fid: Hexstr) -> ResTuple:
"""Execute DELETE FILE command as per TS 102 222 Section 6.4"""

2
pySim/euicc.py
View File

@@ -322,7 +322,7 @@ class CardApplicationISDR(pySim.global_platform.CardApplicationSD):
def store_data(scc: SimCardCommands, tx_do: Hexstr, exp_sw: SwMatchstr ="9000") -> Tuple[Hexstr, SwHexstr]:
"""Perform STORE DATA according to Table 47+48 in Section 5.7.2 of SGP.22.
Only single-block store supported for now."""
capdu = '%sE29100%02x%s' % (scc.cla4lchan('80'), len(tx_do)//2, tx_do)
capdu = '80E29100%02x%s' % (len(tx_do)//2, tx_do)
return scc.send_apdu_checksw(capdu, exp_sw)
@staticmethod