88 lines
2.8 KiB
Python
88 lines
2.8 KiB
Python
import crypto_utils, utils, pycsc, binascii
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DEBUG = True
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class Card:
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APDU_GET_RESPONSE = "\x00\xC0\x00\x00"
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SW_OK = '\x90\x00'
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ATRS = []
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DRIVER_NAME = "Generic"
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COMMANDS = {}
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STATUS_WORDS = {
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SW_OK: "Normal execution"
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}
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def __init__(self, card = None):
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if card is None:
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self.card = pycsc.pycsc(protocol = pycsc.SCARD_PROTOCOL_ANY)
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else:
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self.card = card
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self._i = 0
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self.last_apdu = None
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self.last_sw = None
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self.sw_changed = False
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def _check_apdu(apdu):
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if len(apdu) < 4 or ((len(apdu) > 5) and len(apdu) != (ord(apdu[4])+5)):
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print "Cowardly refusing to send invalid APDU:\n ", utils.hexdump(apdu, indent=2)
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return False
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return True
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_check_apdu = staticmethod(_check_apdu)
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def _real_send(self, apdu):
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if not Card._check_apdu(apdu):
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raise Exception, "Invalid APDU"
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if DEBUG:
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print ">> " + utils.hexdump(apdu, indent = 3)
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result = self.card.transmit(apdu)
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self.last_apdu = apdu
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self.last_sw = result[-2:]
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self.sw_changed = True
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if DEBUG:
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print "<< " + utils.hexdump(result, indent = 3)
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return result
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def send_apdu(self, apdu):
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if not Card._check_apdu(apdu):
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raise Exception, "Invalid APDU"
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if DEBUG:
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print "%s\nBeginning transaction %i" % ('-'*80, self._i)
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if hasattr(self, "before_send"):
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apdu = self.before_send(apdu)
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result = self._real_send(apdu)
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if result[0] == '\x61':
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## Need to call GetResponse
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gr_apdu = self.APDU_GET_RESPONSE + result[1]
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result = self._real_send(gr_apdu)
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if DEBUG:
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print "Ending transaction %i\n%s\n" % (self._i, '-'*80)
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self._i = self._i + 1
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return result
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def can_handle(cls, ATR):
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"""Determine whether this class can handle a card with that ATR."""
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for (knownatr, mask) in cls.ATRS:
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if len(knownatr) != len(ATR):
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continue
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if crypto_utils.andstring(knownatr, mask) == crypto_utils.andstring(ATR, mask):
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return True
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return False
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can_handle = classmethod(can_handle)
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def get_prompt(self):
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return "(%s)" % self.DRIVER_NAME
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def decode_statusword(self):
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if self.last_sw is None:
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return "No command executed so far"
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elif self.last_sw[0] == "\x61":
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return "%i (0x%02x) bytes of response data can be retrieved with GetResponse." % ( (ord(self.last_sw[1])) * 2 )
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else:
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return self.STATUS_WORDS.get(self.last_sw, "Unknown SW: %s" % binascii.b2a_hex(self.last_sw))
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