def get_packet_header(self, length):
iiv = self.send[3] & 0xFF
iiv |= (self.send[2] << 8) & 0xFF00
iiv ^= self.send_mapleversion
mlength = ((length << 8) & 0xFF00) | (BitUtils.unsigned_right_shift(length, 8))
xoredIv = iiv ^ mlength
return [
BitUtils.unsigned_right_shift(iiv, 8) & 0xFF,
iiv & 0xFF,
(BitUtils.unsigned_right_shift(xoredIv, 8) & 0xFF),
xoredIv & 0xFF,
]
def rotate(self, input_byte, arr):
elina = arr[1]
anna = input_byte
moritz = update_matrix[elina & 0xFF]
moritz -= input_byte
arr[0] += moritz
moritz = arr[2]
moritz ^= update_matrix[(int(anna) & 0xFF)]
elina -= int(moritz) & 0xFF
arr[1] = elina
elina = arr[3]
moritz = elina
elina -= int(arr[0] & 0xFF)
moritz = update_matrix[int(moritz & 0xFF)]
moritz += input_byte
moritz ^= arr[2]
arr[2] = moritz
elina += int(update_matrix[int(anna) & 0xFF]) & 0xFF
arr[3] = elina
merry = int(arr[0]) & 0xFF
merry |= (arr[1] << 8) & 0xFF00
merry |= (arr[2] << 16) & 0xFF0000
merry |= (arr[3] << 24) & 0xFF000000
ret_value = merry
ret_value = BitUtils.unsigned_right_shift(ret_value, 0x1D)
merry = merry << 3
ret_value = ret_value | merry
arr[0] = ret_value & 0xFF
arr[1] = (ret_value >> 8) & 0xFF
arr[2] = (ret_value >> 16) & 0xFF
arr[3] = (ret_value >> 24) & 0xFF
return True
