5 Feb
2024
5 Feb
'24
1:46 a.m.
laforge has uploaded this change for review. (
https://gerrit.osmocom.org/c/pysim/+/35837?usp=email )
Change subject: pylint: global_platform/scp.py
......................................................................
pylint: global_platform/scp.py
pySim/global_platform/scp.py:27:0: W0404: Reimport 'Optional' (imported line 20)
(reimported)
pySim/global_platform/scp.py:157:8: R1705: Unnecessary "else" after
"return", remove the "else" and de-indent the code inside it
(no-else-return)
pySim/global_platform/scp.py:165:8: W0107: Unnecessary pass statement (unnecessary-pass)
pySim/global_platform/scp.py:182:8: R1705: Unnecessary "else" after
"return", remove the "else" and de-indent the code inside it
(no-else-return)
pySim/global_platform/scp.py:189:8: R1705: Unnecessary "else" after
"return", remove the "else" and de-indent the code inside it
(no-else-return)
pySim/global_platform/scp.py:266:4: W0221: Variadics removed in overriding
'SCP02._wrap_cmd_apdu' method (arguments-differ)
pySim/global_platform/scp.py:298:4: W0237: Parameter 'rsp_apdu' has been renamed
to 'apdu' in overriding 'SCP02.unwrap_rsp_apdu' method
(arguments-renamed)
pySim/global_platform/scp.py:314:7: C0121: Comparison 'l == None' should be 'l
is None' (singleton-comparison)
pySim/global_platform/scp.py:436:11: C0121: Comparison 'host_challenge == None'
should be 'host_challenge is None' (singleton-comparison)
pySim/global_platform/scp.py:506:4: W0237: Parameter 'rsp_apdu' has been renamed
to 'apdu' in overriding 'SCP03.unwrap_rsp_apdu' method
(arguments-renamed)
pySim/global_platform/scp.py:27:0: C0411: standard import "from typing import
Optional" should be placed before "from Cryptodome.Cipher import DES3, DES"
(wrong-import-order)
Change-Id: Idd2b779a6628c88d9a48c94b8581525209824426
---
M pySim/global_platform/scp.py
1 file changed, 36 insertions(+), 18 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/pysim refs/changes/37/35837/1
diff --git a/pySim/global_platform/scp.py b/pySim/global_platform/scp.py
index 4e64e41..0804492 100644
--- a/pySim/global_platform/scp.py
+++ b/pySim/global_platform/scp.py
@@ -24,15 +24,14 @@
from construct import Optional as COptional
from pySim.utils import b2h, bertlv_parse_len, bertlv_encode_len
from pySim.secure_channel import SecureChannel
-from typing import Optional
logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)
def scp02_key_derivation(constant: bytes, counter: int, base_key: bytes) -> bytes:
- assert(len(constant) == 2)
+ assert len(constant) == 2
assert(counter >= 0 and counter <= 65535)
- assert(len(base_key) == 16)
+ assert len(base_key) == 16
derivation_data = constant + counter.to_bytes(2, 'big') + b'\x00' *
12
cipher = DES3.new(base_key, DES.MODE_CBC, b'\x00' * 8)
@@ -156,8 +155,7 @@
# only protect those APDUs that actually are global platform commands
if apdu[0] & 0x80:
return self._wrap_cmd_apdu(apdu, *args, **kwargs)
- else:
- return apdu
+ return apdu
@abc.abstractmethod
def _wrap_cmd_apdu(self, apdu: bytes, *args, **kwargs) -> bytes:
@@ -181,8 +179,7 @@
num_pad = len(key) % self.sk.blocksize
if num_pad:
return bertlv_encode_len(len(key)) + self.dek_encrypt(key +
b'\x00'*num_pad)
- else:
- return self.dek_encrypt(key)
+ return self.dek_encrypt(key)
def decrypt_key(self, encrypted_key:bytes) -> bytes:
"""Decrypt a key with the DEK."""
@@ -263,7 +260,7 @@
mac = self.sk.calc_mac_1des(header + self.host_cryptogram, True)
return bytes([self._cla(True), INS_EXT_AUTH, self.security_level, 0, 16]) +
self.host_cryptogram + mac
- def _wrap_cmd_apdu(self, apdu: bytes) -> bytes:
+ def _wrap_cmd_apdu(self, apdu: bytes, *args, **kwargs) -> bytes:
"""Wrap Command APDU for SCP02: calculate MAC and
encrypt."""
lc = len(apdu) - 5
assert len(apdu) >= 5, "Wrong APDU length: %d" % len(apdu)
@@ -295,9 +292,9 @@
apdu = bytes([self._cla(True, b8)]) + apdu[1:4] + bytes([lc]) + data + mac
return apdu
- def unwrap_rsp_apdu(self, sw: bytes, apdu: bytes) -> bytes:
+ def unwrap_rsp_apdu(self, sw: bytes, rsp_apdu: bytes) -> bytes:
# TODO: Implement R-MAC / R-ENC
- return apdu
+ return rsp_apdu
@@ -311,7 +308,7 @@
def prf(key: bytes, data:bytes):
return CMAC.new(key, data, AES).digest()
- if l == None:
+ if l is None:
l = len(base_key) * 8
logger.debug("scp03_kdf(constant=%s, context=%s, base_key=%s, l=%u)",
b2h(constant), b2h(context), b2h(base_key), l)
@@ -433,7 +430,7 @@
def gen_init_update_apdu(self, host_challenge: Optional[bytes] = None) -> bytes:
"""Generate INITIALIZE UPDATE APDU."""
- if host_challenge == None:
+ if host_challenge is None:
host_challenge = b'\x00' * self.s_mode
if len(host_challenge) != self.s_mode:
raise ValueError('Host Challenge must be %u bytes long' %
self.s_mode)
@@ -503,20 +500,20 @@
return mapdu
- def unwrap_rsp_apdu(self, sw: bytes, apdu: bytes) -> bytes:
+ def unwrap_rsp_apdu(self, sw: bytes, rsp_apdu: bytes) -> bytes:
# No R-MAC shall be generated and no protection shall be applied to a response
that includes an error
# status word: in this case only the status word shall be returned in the
response. All status words
# except '9000' and warning status words (i.e. '62xx' and
'63xx') shall be interpreted as error status
# words.
- logger.debug("unwrap_rsp_apdu(sw=%s, apdu=%s)", sw, apdu)
+ logger.debug("unwrap_rsp_apdu(sw=%s, rsp_apdu=%s)", sw, rsp_apdu)
if not self.do_rmac:
assert not self.do_renc
- return apdu
+ return rsp_apdu
if sw != b'\x90\x00' and sw[0] not in [0x62, 0x63]:
- return apdu
- response_data = apdu[:-self.s_mode]
- rmac = apdu[-self.s_mode:]
+ return rsp_apdu
+ response_data = rsp_apdu[:-self.s_mode]
+ rmac = rsp_apdu[-self.s_mode:]
rmac_exp = self.sk.calc_rmac(response_data + sw)[:self.s_mode]
if rmac != rmac_exp:
raise ValueError("R-MAC value not matching: received: %s, computed:
%s" % (rmac, rmac_exp))
--
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Gerrit-Project: pysim
Gerrit-Branch: master
Gerrit-Change-Id: Idd2b779a6628c88d9a48c94b8581525209824426
Gerrit-Change-Number: 35837
Gerrit-PatchSet: 1
Gerrit-Owner: laforge <laforge(a)osmocom.org>
Gerrit-MessageType: newchange