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from dataclasses import dataclass
from typing import Optional
from public import public
from .base import Target
@public
@dataclass
class CommandAPDU(object): # pragma: no cover
"""A command APDU that can be sent to an ISO7816-4 target."""
cls: int
ins: int
p1: int
p2: int
data: Optional[bytes]
def __bytes__(self):
if self.data is None or len(self.data) == 0:
return bytes([self.cls, self.ins, self.p1, self.p2])
elif len(self.data) <= 255:
return bytes([self.cls, self.ins, self.p1, self.p2, len(self.data)]) + self.data
else:
data_len = len(self.data)
return bytes([self.cls, self.ins, self.p1, self.p2, 0, data_len >> 8,
data_len & 0xff]) + self.data
@public
@dataclass
class ResponseAPDU(object):
"""A response APDU that can be received from an ISO7816-4 target."""
data: Optional[bytes]
sw: int
@public
class ISO7816Target(Target):
"""An ISO7816-4 target."""
@property
def atr(self) -> bytes:
"""The ATR (Answer To Reset) of the target."""
raise NotImplementedError
def select(self, aid: bytes) -> bool:
"""
Select an applet with `aid`.
:param aid: The AID of the applet to select.
:return: Whether the selection was successful.
"""
raise NotImplementedError
def send_apdu(self, apdu: CommandAPDU) -> ResponseAPDU:
"""
Send an APDU to the selected applet.
:param apdu: The APDU to send.
:return: The response.
"""
raise NotImplementedError
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