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[source]

Bases: Exception

Card could not be connected.

add_note()[source]

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

args[source]
with_traceback()[source]

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)[source]

Bases: IntEnum

Card protocol to use/negotiate.

T0 = 0[source]
T1 = 1[source]
conjugate()[source]

Returns self, the complex conjugate of any int.

bit_length()[source]

Number of bits necessary to represent self in binary.

>>> bin(37)
'0b100101'
>>> (37).bit_length()
6
bit_count()[source]

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

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.

from_bytes(byteorder='big', *, signed=False)[source]

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.

as_integer_ratio()[source]

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)
real[source]

the real part of a complex number

imag[source]

the imaginary part of a complex number

numerator[source]

the numerator of a rational number in lowest terms

denominator[source]

the denominator of a rational number in lowest terms

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

Bases: object

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

cls: int[source]
ins: int[source]
p1: int[source]
p2: int[source]
data: Optional[bytes] = None[source]
ne: Optional[int] = None[source]
class ResponseAPDU(data, sw)[source]

Bases: object

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

data: bytes[source]
sw: int[source]
class ISO7816Target[source]

Bases: Target, ABC

ISO7816-4 target.

abstract connect(protocol=None)[source]

Connect to the card.

Parameters:

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

abstract property atr: bytes[source]

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

abstract select(aid)[source]

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)[source]

Send an APDU to the selected applet.

Parameters:

apdu (CommandAPDU) – The APDU to send.

Return type:

ResponseAPDU

Returns:

The response.

abstract disconnect()[source]

Disconnect from the target device.

class ISO7816[source]

Bases: object

Bunch of ISO7816-4 constants (status words).

SW_FILE_FULL = 27268[source]
SW_UNKNOWN = 28416[source]
SW_CLA_NOT_SUPPORTED = 28160[source]
SW_INS_NOT_SUPPORTED = 27904[source]
SW_CORRECT_LENGTH_00 = 27648[source]
SW_WRONG_P1P2 = 27392[source]
SW_INCORRECT_P1P2 = 27270[source]
SW_RECORD_NOT_FOUND = 27267[source]
SW_FILE_NOT_FOUND = 27266[source]
SW_FUNC_NOT_SUPPORTED = 27265[source]
SW_WRONG_DATA = 27264[source]
SW_APPLET_SELECT_FAILED = 27033[source]
SW_COMMAND_NOT_ALLOWED = 27014[source]
SW_CONDITIONS_NOT_SATISFIED = 27013[source]
SW_DATA_INVALID = 27012[source]
SW_FILE_INVALID = 27011[source]
SW_SECURITY_STATUS_NOT_SATISFIED = 27010[source]
SW_WRONG_LENGTH = 26368[source]
SW_BYTES_REMAINING_00 = 24832[source]
SW_NO_ERROR = 36864[source]