checksum code in c#

Question

I need to rewrite the code below in c#.

I think the code is written in c but I only understand a few lines.

Can some help me explain the code?

 

 byte crc8(byte *str, int len)

{

int i, f;

byte data;

byte crc;

crc = 0 ;

while (len--)

{

data = *str++;

for = (i = 0; i < 8; i++)

   {

      f = 1 & (data ^ crc);

      crc >>= 1;

      data >>= 1 ;

         if (f)    {

                     crc ^= 0x8c;

                  }

   }

}

return crc;

}