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"""Provides a smartcard target communicating via PC/SC (Personal Computer/Smart Card)."""
from typing import Union, Optional
from public import public
from smartcard.CardConnection import CardConnection
from smartcard.System import readers
from smartcard.pcsc.PCSCCardConnection import PCSCCardConnection
from smartcard.pcsc.PCSCReader import PCSCReader
from pyecsca.sca.target.ISO7816 import (
ISO7816Target,
CommandAPDU,
ResponseAPDU,
ISO7816,
CardProtocol,
CardConnectionException,
)
@public
class PCSCTarget(ISO7816Target): # pragma: no cover
"""Smartcard target communicating via PCSC."""
def __init__(self, reader: Union[str, PCSCReader]):
if isinstance(reader, str):
rs = readers()
for r in rs:
if r.name == reader:
self.reader = r
break
else:
raise ValueError(f"Reader '{reader}' not found.")
else:
self.reader = reader
self.connection: PCSCCardConnection = self.reader.createConnection()
def connect(self, protocol: Optional[CardProtocol] = None):
proto = CardConnection.T0_protocol | CardConnection.T1_protocol
if protocol == CardProtocol.T0:
proto = CardConnection.T0_protocol
elif protocol == CardProtocol.T1:
proto = CardConnection.T1_protocol
try:
self.connection.connect(proto)
except: # noqa
raise CardConnectionException()
@property
def atr(self) -> bytes:
return bytes(self.connection.getATR())
def select(self, aid: bytes) -> bool:
apdu = CommandAPDU(0x00, 0xA4, 0x04, 0x00, aid)
resp = self.send_apdu(apdu)
return resp.sw == ISO7816.SW_NO_ERROR
def send_apdu(self, apdu: CommandAPDU) -> ResponseAPDU:
resp, sw1, sw2 = self.connection.transmit(list(bytes(apdu)))
return ResponseAPDU(bytes(resp), sw1 << 8 | sw2)
def disconnect(self):
self.connection.disconnect()
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