def lock_app(self):
tag9F36 = self.get_tag('9F36')
tag9F26 = self.get_tag(PROCESS_STEP.FIRST_GAC, '9F26')
key_input = '000000000000' + tag9F36 + '000000000000' + algorithm.xor(
tag9F36, 'FFFF')
mac_input = '841E000008' + tag9F36 + tag9F26
key_mac = algorithm.xor(key_input, self.session_key_mac)
mac = algorithm.des3_mac(key_mac, mac_input)
apdu.lock_app(mac)
def put_data(self, tag, value):
tag9F36 = self.get_tag('9F36')
tag9F26 = self.get_tag(PROCESS_STEP.FIRST_GAC, '9F26')
key_input = '000000000000' + tag9F36 + '000000000000' + algorithm.xor(
tag9F36, 'FFFF')
if len(tag) == 2:
tag = '00' + tag
data_len = utils.int_to_hex_str(len(value) // 2 + 8)
mac_input = '04DA' + tag + data_len + tag9F36 + tag9F26 + value
key_mac = algorithm.xor(key_input, self.key_mac)
mac = algorithm.des3_mac(key_mac, mac_input)
apdu.put_data(tag, value, mac)
def _gen_session_key(key, left_div_data, right_div_data):
left_key = algorithm.des3_encrypt(key, left_div_data)
tmp = algorithm.xor(left_key, right_div_data)
right_key = algorithm.des3_encrypt(key, tmp)
return left_key + right_key