def ext_auth(kmc, div_method, secure_level, host_challenge, init_update_data):
cmd = ''
cmd_data_len = '10'
mac = ''
if secure_level == SECURE_LEVEL.SL_MAC:
cmd = '84820100'
elif secure_level == SECURE_LEVEL.SL_MAC_ENC:
cmd = '84820300'
else:
cmd = '84820000'
scp = init_update_data[22:24]
card_challenge = init_update_data[24:40]
card_cryptogram = init_update_data[40:56]
dek_session_key, mac_session_key, enc_session_key = gen_kmc_session.gen_session_key(
kmc, div_method, host_challenge, init_update_data)
card_cryptogram_input = host_challenge + card_challenge
card_mac = algorithm.des3_full_mac(enc_session_key, card_cryptogram_input)
if card_mac != card_cryptogram:
resp = pcsc.ApduResponse()
resp.sw = 0x6300
return '', resp
host_cryptogram_input = card_challenge + host_challenge
host_mac = algorithm.des3_full_mac(enc_session_key, host_cryptogram_input)
cmd += cmd_data_len + host_mac
if scp == '01':
mac = algorithm.des3_full_mac(enc_session_key, cmd)
else: #scp == '02'
mac = algorithm.des3_mac(mac_session_key, cmd)
cmd += mac
return dek_session_key, pcsc.send_raw(cmd)
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_mc_cvc3(self, tag56, tag9F6B):
self.tags['DC'] = algorithm.des3_mac(self.kdcvc3, tag56)[-4:]
self.tags['DD'] = algorithm.des3_mac(self.kdcvc3, tag9F6B)[-4:]
return self.tags['DC'] + self.tags['DD']
def gen_ac(key,data):
return algorithm.des3_mac(key,data)
