[Discuss-gnuradio] Questions

Hi , i have some questions : 

1- In  the following  .cc file  : ./gr-digital/lib/digital_crc32.cc  

Regarding CRC-32  , why the generated polynomial  is of length 36 Bits instead of 32 Bits (as expected) !  " it is written as : 
  // Automatically generated CRC function

 // polynomial: 0x104C11DB7

the above two lines exist in the code  . "  


 2- In the following .py file  : ./gr-digital/python/ofdm_packet_utils.py 

How  "random_mask_tuple"  is generated through the 15-bit Linear Feedback Shift Register (LFSR) .
Are they random ? if yes , why they are of length 8 bits (maximum number  255 ) instead of 15 bits ?!

Thanks in-advance  
Amr,