def bitCount(int_type):
    # return number 1's in a number when represented as binary
    count = 0
    while(int_type):
        int_type &= int_type - 1
        count += 1
    return(count)

def generate35bitHex(facilityCode, cardCode):
	# generates a hex code for HID 35 bit format card
	# see this page to understand formats:
	#http://www.pagemac.com/azure/data_formats.php
	
	cardData = (facilityCode << 21) + (cardCode << 1)
	# 2nd MSB even parity 
	parity1 = bitCount(cardData & 0x1B6DB6DB6) & 1
	cardData += (parity1 << 33)	# add the parity bit (we need it for further parity calculations)
	# MSB odd parity is the LSB
	parity2 = bitCount(cardData & 0x36DB6DB6C) & 1 ^ 1
	cardData += parity2	# add the parity bit
	# LSB odd parity (covers all 34 other bits)
	parity3 = bitCount(cardData) & 1 ^ 1
	cardData += (parity3 << 34)	# add the parity bit
	return "%09X" % cardData # convert to hex, pad with zeros (9 characters)
	
	
def generate26bitHex(facilityCode, cardCode):
	# generates a hex code for HID 26 bit format card
	# see this page to understand formats:
	#http://www.pagemac.com/azure/data_formats.php
	
	cardData = (facilityCode << 17) + (cardCode << 1)
	# MSB even parity (covers 12 MSB)
	parity1 = bitCount(cardData & 0x1FFE000) & 1
	# LSB odd parity (covers 12 LSB)
	parity2 = bitCount(cardData & 0x0001FFE) & 1 ^ 1
	cardData += (parity1 << 25) + (parity2)
	return "%06X" % cardData  # convert to hex, pad with zeros (6 characters)
	 
facilityCode = 54
cardCode = 360100
generate35bitHex(facilityCode, cardCode)