def multiblock_MAC_verification(connection, KeyId, WorkingKeyMode = None, WorkingKey = None, Versus = None, Data = None, IV = None, BlockSize = 16, MACData = None):
"""
MultiBlock Encryption, MAC verification: Keyboard and Security (0x40,0x16).
:Parameters:
-*connection* (PupySPOT): Object managing spot connection.
- *KeyId* (integer): Slot ID of Master Key.
- *WorkingKeyMode* (Enums.WKMode): Working Key format.
- *WorkingKey* (bytes array): Working Key value encrypted with Master Key.
- *Versus* (Enums.Versus): Operation required.
- *Data* (bytes array): Data block on which the operation is performed.
- *IV* (bytes array): Initial vector IV.
- *BlockSize* (integer): Length of each block.
- *MACData* (bytes array): MAC data buffer to verify.
:Returns: Ack-Code indicating successful of the operation.
"""
blkcount = 0
data = Data
cblock = IV
macData = None
# block split
while True:
block = data[:BlockSize]
data = data[BlockSize:]
#send
if len(block) > 0 and len(data) > 0:
flags = Enums.Flags.START_DATA_BLOCK if blkcount == 0 else Enums.Flags.INTERMEDIATE_DATA_BLOCK
else:
flags = Enums.Flags.FIRSTANDLAST_DATA_BLOCK if blkcount == 0 else Enums.Flags.END_DATA_BLOCK
macData = MACData
Protocol.send_multiblock_verification(connection, KeyId = KeyId, WorkingKeyMode = Enums.WKMode[WorkingKeyMode], WorkingKey = WorkingKey, Flags = flags, Versus = Enums.Versus[Versus], Data = block, ChainingData = cblock, MACData = macData)
#receive
ack = Protocol.recv_multiblock_verification(connection, 120)
if ack['ACKcode'] == 0x00:
cblock = ack['ChainingData']
if flags == Enums.Flags.FIRSTANDLAST_DATA_BLOCK or flags == Enums.Flags.END_DATA_BLOCK: break
else: break
blkcount += 1
return ack['ACKcode']
