Gr_crc16 implemented?

Hi all,

I need to check payload data with only 2 crc bytes. But there is only
the
gr_crc32 module in gnuradio core with an algorithm that uses a table
array
with 256 elements. I wonder if there is anyone who has had a similar
problem and implemented a gr_crc16 ? I am unfamiliar on how the
algorithm
works in the gr_crc32.

Thanks in advance,

C