def calculate_card_challenge_SCP03(data, key):
'''
Calculate the card challenge in case of pseudo ramdom
:param data (str): Data uses to calculate card challenge.
:param key (str) : The Secure Channel Message Authentication Code Key.
:returns: (tuple): tuple containing:
- class:`ErrorStatus` with error status ERROR_STATUS_SUCCESS if no error occurs, otherwise error code and error message are contained in the class :class:`ErrorStatus`.
- The card challenge (str) if no error occurs, None otherwize.
'''
logger.log_start("calculate_card_challenge_SCP03")
logger.log_debug(" Calculate card challenge using %s " % data)
SCP03_CST_DERIVATION_CARD_CHALLENGE = '02'
# 1. first build the derivation data
der_data = ''
der_data = '00 00 00 00 00 00 00 00 00 00 00' + SCP03_CST_DERIVATION_CARD_CHALLENGE
der_data += '00'
der_data += '0040'
der_data += '01'
der_data += data
# 2. calculate cryptogram
cryptogram = __SCP03_KDF_CounterMode__(der_data, key, 0x01)
logger.log_end("calculate_card_challenge_SCP03")
return cryptogram
def calculate_host_cryptogram_SCP03(cardChallenge, hostChallenge,
session_mac_key):
# padd data if needed
logger.log_start("calculate_host_cryptogram_SCP03")
SCP03_CST_DERIVATION_HOST_CRYPTO = '01'
data = hostChallenge + cardChallenge
# 1. first build the derivation data
der_data = ''
der_data = '00 00 00 00 00 00 00 00 00 00 00' + SCP03_CST_DERIVATION_HOST_CRYPTO
der_data += '00'
der_data += '0040'
der_data += '01'
der_data += data
logger.log_debug("\tCalculates host cryptogram using %s " % der_data)
cryptogram = __SCP03_KDF_CounterMode__(der_data, session_mac_key, 0x01)
logger.log_debug("\tHost cryptogram: %s " % cryptogram)
logger.log_end("calculate_host_cryptogram_SCP03")
return cryptogram
def calculate_card_cryptogram_SCP03(cardChallenge, hostChallenge,
session_mac_key):
'''
Calculates the card cryptogram for SCP03.
:param cardChallenge (str): The card challenge.
:param hostChallenge (str): The host challenge.
:param key (str) : The Secure Channel Message Authentication Code Key.
:returns: str: The card cryptogram if no error occurs, None otherwize.
'''
SCP03_CST_DERIVATION_CARD_CRYPTO = '00'
logger.log_start("calculate_card_cryptogram_SCP03")
data = hostChallenge + cardChallenge
# 1. first build the derivation data
der_data = ''
der_data = '00 00 00 00 00 00 00 00 00 00 00' + SCP03_CST_DERIVATION_CARD_CRYPTO
der_data += '00'
der_data += '0040'
der_data += '01'
der_data += data
logger.log_debug("\tCalculates card cryptogram using %s " % der_data)
# 2. calculate cryptogram
cryptogram = __SCP03_KDF_CounterMode__(der_data, session_mac_key, 0x01)
logger.log_debug("\tCard cryptogram: %s " % cryptogram)
logger.log_end("calculate_card_cryptogram_SCP03")
return cryptogram
# padd data if needed
data = crypto.ISO_9797_M2_Padding(data, 8)
logger.log_debug("\tData padded: %s " % data)
#calculate the cryptogram
cryptogram = crypto.MAC33(data, session_enc_key, crypto.ICV_NULL_8)
logger.log_debug("\tCard cryptogram: %s " % cryptogram)
logger.log_end("calculate_card_cryptogram_SCP02")
return cryptogram
def calculate_host_cryptogram_SCP02(sequenceCounter, cardChallenge,
hostChallenge, session_enc_key):
# padd data if needed
logger.log_start("calculate_host_cryptogram_SCP02")
data = sequenceCounter + cardChallenge + hostChallenge
logger.log_debug(" Calculates host cryptogram using %s " % data)
data = crypto.ISO_9797_M2_Padding(data, 8)
cryptogram = crypto.MAC33(data, session_enc_key, crypto.ICV_NULL_8)
logger.log_debug("host cryptogram: %s " % cryptogram)
logger.log_end("calculate_host_cryptogram_SCP02")
return cryptogram
def calculate_card_challenge_SCP02(data, key):
'''
Calculate the card challenge in case of pseudo ramdom
:param data (str): Data uses to calculate card challenge.
:param key (str) : The Secure Channel Message Authentication Code Key.
:returns: (tuple): tuple containing:
- class:`ErrorStatus` with error status ERROR_STATUS_SUCCESS if no error occurs, otherwise error code and error message are contained in the class :class:`ErrorStatus`.
- The card challenge (str) if no error occurs, None otherwize.
'''
logger.log_start("calculate_card_challenge_SCP02")
logger.log_debug(" Calculate card challenge using %s " % data)
error_status, challenge = compute_mac(data, key, crypto.ICV_NULL_8)
logger.log_end("calculate_card_challenge_SCP02", error_status.status)
# card challenge is the 6 first bytes of the MAC
return challenge[0:6 * 2]
def calculate_card_cryptogram_SCP02(sequenceCounter, cardChallenge,
hostChallenge, session_enc_key):
'''
Calculates the card cryptogram for SCP02.
:param sequenceCounter (str): The sequence counter.
:param cardChallenge (str): The card challenge.
:param hostChallenge (str): The host challenge.
:param session_enc_key (str) : The Session Encryption Key for calculating the card cryptogram.
:returns: (tuple): tuple containing:
- class:`ErrorStatus` with error status ERROR_STATUS_SUCCESS if no error occurs, otherwise error code and error message are contained in the class :class:`ErrorStatus`.
- The card cryptogram (str) if no error occurs, None otherwize.
'''
logger.log_start("calculate_card_cryptogram_SCP02")
data = hostChallenge + sequenceCounter + cardChallenge
logger.log_debug("\tCalculates card cryptogram using %s " % data)
# padd data if needed
data = crypto.ISO_9797_M2_Padding(data, 8)
logger.log_debug("\tData padded: %s " % data)
#calculate the cryptogram
cryptogram = crypto.MAC33(data, session_enc_key, crypto.ICV_NULL_8)
logger.log_debug("\tCard cryptogram: %s " % cryptogram)
logger.log_end("calculate_card_cryptogram_SCP02")
return cryptogram