Create hex for proxmark3 and generate 26bit wiegand formatted badge data

gistfile1.txt

#!/usr/bin/env ruby
#the wiegand data format is just 26 bits, 
#   even_parity_bit + 8bit_facility_code + 16bit_badge_code + odd_parity_bit
# The proxcard II format expects the 26bit part appended to the "magic"
#magic is really the OEM, plus card type, which i've locked to the magic var 
#    below for my purposes. Change it to match yoursjuu

def generate_44bit_hex(bin)
    chopped = bin.chars.each_slice(4).map(&:join)
    hex_string = ""
    chopped.each do |binary|
    hex_string << binary.to_i(2).to_s(base=16)    
    end
    return hex_string
end

def generate_bin(site_code,badge_number) #without parity calculations
    badge_bin =  "%016b" % badge_number
    site_bin = "%08b" % site_code
    return site_bin + badge_bin
end

def first_parity(binary_number) 
    num = binary_number[0..11]
    if num.count("1").even?
        return '0'
    else
        return '1'
    end
end

def last_parity(binary_number)
    num = binary_number[12..24]
    if num.count("1").odd?
        return '0'
    else
        return '1'
    end
end

def generate_26bit_bin(site_code, badge_number)
    non_parity_bin = generate_bin(site_code, badge_number)
    start_parity = first_parity(non_parity_bin)
    end_parity = last_parity(non_parity_bin)
    return (start_parity + non_parity_bin + end_parity)
end


#0.upto(255).each do |site_code|

bin = generate_26bit_bin(110,19657) #test site code + badge number
magic = '00100000000001' #needed to work for 44bit proxcard II format
puts generate_44bit_hex(magic+bin)
#end