Python 2 parse ntlm message

parse_ntlm.py

def parseNtlmMsg(msg):
	def decode_int(byte_string):
		return int(byte_string[::-1].encode('hex'), 16)

	def decode_string(byte_string):
		return byte_string.replace('\x00', '')

	target_info_fields  = msg[40:48]
	target_info_len     = decode_int(target_info_fields[0:2])
	target_info_offset  = decode_int(target_info_fields[4:8])
	target_info_bytes = msg[target_info_offset:target_info_offset+target_info_len]
	MsvAvEOL             = 0x0000
	MsvAvNbComputerName  = 0x0001
	MsvAvNbDomainName    = 0x0002
	MsvAvDnsComputerName = 0x0003
	MsvAvDnsDomainName   = 0x0004
	target_info = OrderedDict()
	info_offset = 0

	while info_offset < len(target_info_bytes):
		av_id = decode_int(target_info_bytes[info_offset:info_offset+2])
		av_len = decode_int(target_info_bytes[info_offset+2:info_offset+4])
		av_value = target_info_bytes[info_offset+4:info_offset+4+av_len]
		info_offset = info_offset + 4 + av_len
		if av_id == MsvAvEOL:
			pass
		elif av_id == MsvAvNbComputerName:
			target_info['MsvAvNbComputerName'] = decode_string(av_value)
		elif av_id == MsvAvNbDomainName:
			target_info['MsvAvNbDomainName'] = decode_string(av_value)
		elif av_id == MsvAvDnsComputerName:
			target_info['MsvAvDnsComputerName'] = decode_string(av_value)
		elif av_id == MsvAvDnsDomainName:
			target_info['MsvAvDnsDomainName'] = decode_string(av_value)
	return target_info