capcah

  void xor_file_stream(file input, stream random_stream){
    result = []
    file_byte = read_byte(input)
    while(file_byte != EOF){
      stream_byte = read_byte(random_stream)
      res.append(file_byte^stream_byte)
      file_byte = read_byte(input)
    }return result
  }

  byte xor(byte b1, byte b2){
    return byte(byte b2){
      return b1^b2
    }
  }
  //Here I assume the language has file and random_stream as iterables
  void xor_file_stream(file input,stream random_stream){
    return map(map(xor,random_stream),input)
  }