pyecsca.sca.target.ISO7816 module

Provides classes for working with ISO7816-4 APDUs and an abstract base class for an ISO7816-4 based target.

exception CardConnectionException

Bases: Exception

Card could not be connected.

add_note()

Exception.add_note(note) – add a note to the exception

args

with_traceback()

Exception.with_traceback(tb) – set self.__traceback__ to tb and return self.

class CardProtocol(value, names=None, *, module=None, qualname=None, type=None, start=1, boundary=None)

Bases: IntEnum

Card protocol to use/negotiate.

T0 = 0

T1 = 1

as_integer_ratio()

Return integer ratio.

Return a pair of integers, whose ratio is exactly equal to the original int and with a positive denominator.

>>> (10).as_integer_ratio()
(10, 1)
>>> (-10).as_integer_ratio()
(-10, 1)
>>> (0).as_integer_ratio()
(0, 1)

bit_count()

Number of ones in the binary representation of the absolute value of self.

Also known as the population count.

>>> bin(13)
'0b1101'
>>> (13).bit_count()
3

bit_length()

Number of bits necessary to represent self in binary.

>>> bin(37)
'0b100101'
>>> (37).bit_length()
6

conjugate()

Returns self, the complex conjugate of any int.

denominator

the denominator of a rational number in lowest terms

from_bytes(byteorder='big', *, signed=False)

Return the integer represented by the given array of bytes.

bytes

Holds the array of bytes to convert. The argument must either support the buffer protocol or be an iterable object producing bytes. Bytes and bytearray are examples of built-in objects that support the buffer protocol.

byteorder

The byte order used to represent the integer. If byteorder is ‘big’, the most significant byte is at the beginning of the byte array. If byteorder is ‘little’, the most significant byte is at the end of the byte array. To request the native byte order of the host system, use `sys.byteorder’ as the byte order value. Default is to use ‘big’.

signed

Indicates whether two’s complement is used to represent the integer.

imag

the imaginary part of a complex number

numerator

the numerator of a rational number in lowest terms

real

the real part of a complex number

to_bytes(length=1, byteorder='big', *, signed=False)

Return an array of bytes representing an integer.

length

Length of bytes object to use. An OverflowError is raised if the integer is not representable with the given number of bytes. Default is length 1.

byteorder

The byte order used to represent the integer. If byteorder is ‘big’, the most significant byte is at the beginning of the byte array. If byteorder is ‘little’, the most significant byte is at the end of the byte array. To request the native byte order of the host system, use `sys.byteorder’ as the byte order value. Default is to use ‘big’.

signed

Determines whether two’s complement is used to represent the integer. If signed is False and a negative integer is given, an OverflowError is raised.

class CommandAPDU(cls, ins, p1, p2, data=None, ne=None)

Bases: object

Command APDU that can be sent to an ISO7816-4 target.

cls: int

ins: int

p1: int

p2: int

data: Optional[bytes] = None

ne: Optional[int] = None

class ResponseAPDU(data, sw)

Bases: object

Response APDU that can be received from an ISO7816-4 target.

data: bytes

sw: int

class ISO7816Target

Bases: Target, ABC

ISO7816-4 target.

abstract connect(protocol=None)

Connect to the card.

Parameters:

protocol (Optional[CardProtocol]) – CardProtocol to use.

abstract property atr: bytes

Return the ATR (Answer To Reset) of the target.

abstract select(aid)

Select an applet with aid.

Parameters:

aid (bytes) – The AID of the applet to select.

Return type:

bool

Returns:

Whether the selection was successful.

abstract send_apdu(apdu)

Send an APDU to the selected applet.

Parameters:

apdu (CommandAPDU) – The APDU to send.

Return type:

ResponseAPDU

Returns:

The response.

abstract disconnect()

Disconnect from the target device.

class ISO7816

Bases: object

Bunch of ISO7816-4 constants (status words).

SW_FILE_FULL = 27268

SW_UNKNOWN = 28416

SW_CLA_NOT_SUPPORTED = 28160

SW_INS_NOT_SUPPORTED = 27904

SW_CORRECT_LENGTH_00 = 27648

SW_WRONG_P1P2 = 27392

SW_INCORRECT_P1P2 = 27270

SW_RECORD_NOT_FOUND = 27267

SW_FILE_NOT_FOUND = 27266

SW_FUNC_NOT_SUPPORTED = 27265

SW_WRONG_DATA = 27264

SW_APPLET_SELECT_FAILED = 27033

SW_COMMAND_NOT_ALLOWED = 27014

SW_CONDITIONS_NOT_SATISFIED = 27013

SW_DATA_INVALID = 27012

SW_FILE_INVALID = 27011

SW_SECURITY_STATUS_NOT_SATISFIED = 27010

SW_WRONG_LENGTH = 26368

SW_BYTES_REMAINING_00 = 24832

SW_NO_ERROR = 36864