def decode(self, data):
data = self.maple_aes(data, self.receive)
self.decodeUpdate()
# Maple Custom Decryption
for j in range(1, 7):
remember = 0
data_length = len(data) & 0xFF
next_remember = 0
if j % 2 == 0:
for i in xrange(len(data)):
cur = data[i]
cur -= 0x48
cur = ~cur & 0xFF
cur = BitUtils.roll_left(cur, data_length & 0xFF)
next_remember = cur
cur ^= remember
remember = next_remember
cur -= data_length
cur = BitUtils.roll_right(cur, 3)
data[i] = cur
data_length -= 1
else:
for i in reversed(xrange(len(data))):
cur = data[i]
cur = BitUtils.roll_left(cur, 3)
cur ^= 0x13
next_remember = cur
cur ^= remember
remember = next_remember
cur -= data_length
cur = BitUtils.roll_right(cur, 4)
data[i] = cur
data_length -= 1
return struct.pack("<%sB" % len(data), data)
def encode(self, data):
header = self.get_packet_header(len(data))
# Maple custom encryption
for j in xrange(0, 6):
remember = 0
data_length = len(data) & 0xFF
if j % 2 == 0:
for i in xrange(len(data)):
cur = data[i]
cur = BitUtils.roll_left(cur, 3)
cur += data_length
cur ^= remember
remember = cur
cur = BitUtils.roll_right(cur, data_length & 0xFF)
cur = ~cur & 0xFF
cur += 0x48
data_length -= 1
data[i] = cur
else:
for i in reversed(xrange(len(data))):
cur = data[i]
cur = BitUtils.roll_left(cur, 4)
cur += data_length
cur ^= remember
remember = cur
cur ^= 0x13
cur = BitUtils.roll_right(cur, 3)
data_length -= 1
data[i] = cur
print "After custom ", data
data = self.maple_aes(data, self.send)
print "After aes ", data
self.encodeUpdate()
return header + data
