nitram2342
commented
3 years ago Thank you for your feedback. I updated the documentation. It was not in sync with how the tool should be started after several changes. Please try:
./bruteforce-crc --verbose 1 --file data.txt --start 0 --end 49 --width 10 --offs-crc 49 --probe-initial true
Warning: input reflection only works if range start ... end is N * 8 bit with N > 0
Extracted message with crc 03fa
Extracted message with crc 0145
Extracted message with crc 00e7
Extracted 3 messages and CRC values
Brute Force CRC Settings
------------------------
CRC Width : 10
Truncated Polynomial : 0x0 to 0x3ff
Truncated Polynomial : 0x0 to 0x3ff
Initial value : 0x0 to 0x3ff
final xor : 0x0
Probe reflect in : false
Probe reflect out : false
Feed type : auto
Permutation count : 1046529
Multithreaded CRC Brute Force Initiated
---------------------------------------
Number of threads : 4
Number of test vectors : 3
Testing Known CRC's for Length 10
---------------------------------
Starting brute forcer over selected threads
-------------------------------------------
Starting Thread 0, searching from 0 to fe
Starting Thread 1, searching from ff to 1fd
Starting Thread 2, searching from 1fe to 2fc
Starting Thread 3, searching from 2fd to 3ff
----------------------------[ MATCH ]--------------------------------
Found a model for the CRC calculation:
Truncated polynom : 0xbd (189)
Initial value : 0x95 (149)
Final XOR : 0x0 (0)
Reflected input : false
Reflected output : false
Feed type : auto
Found 1 matches.
I don't know if this is because of ubuntu 20 incompatibility or someone if the tool is simply broken but if you run the example line: ./bruteforce-crc --file test.txt -width 10 --offs-crc 49 --start 0 --end 49
You will get: Warning: input reflection only works if range start ... end is N * 8 bit with N > ) No model found.
The README instructions actually contain a typo: ./buteforce-crc etc etc etc
I hope that doesn't mean this tool wasn't actually tested. Hope this helps