simplexor.rb

def xor(key)
  if key.kind_of?(String)
    kenum = key.bytes.cycle
  else
    kenum = key.to_s(16).bytes.cycle
  end
  self.to_s(16).bytes.map {|b| b ^ kenum.next }.pack("C*")
end


n = 1234.xor(0x34)

pp n #{=> }"\aP\001"

pp n.xor(0x34).hex #=> 1234