Is this CRC calculation correct? I am currently studying for an exam and trying to check a message (binary) for errors using a polynomial, I would like if somebody could verify that my results below are (in)valid.
Thanks.
Message: 11110101 11110101
Polynomial: X4 + x2 + 1
Divisor (Derived from polynomial): 10101
Remainder:111
Result: There is an error in the above message?

Also, I had a link to an online calculator that would do the division but can't relocate it, any links to a calculator would be greatly appreciated.
Thanks.

 1111010111110101 | 10101
+10101            | 11001011101
  10111           |
 +10101           |
     10011        |
    +10101        |
       11011      |
      +10101      |
        11101     |
       +10101     |
         10000    |
        +10101    |
           10110  |
          +10101  |
              111 | <- you are right! there is an error in the message!

