gf(2) mod

c = a % b

Calculate c = a/b, result is cremainder

gf(2) Polynomial long division

c = a/b

a = b00000000000000000000010000000000
a = 0x00000400
a = x10

b = b00000000000000000000000101110001
b = 0x00000171
b = x8 + x6 + x5 + x4 + 1

  10000000000 | 101110001
- 101110001   | 1
  ----------- |
    111000100 |
-  000000000  | 0
-   101110001 | 1
  ----------- |
     10110101 |

cquotient = b00000000000000000000000000000101
cquotient = 0x00000005
cquotient = x2 + 1

cremainder = b00000000000000000000000010110101
cremainder = 0x000000b5
cremainder = x7 + x5 + x4 + x2 + 1