Hello, I am currently working on USB Link Layer dissector. It is supposed to be used with OpenVizsla FPGA-based USB hardware sniffer. USB Packets feature two CRC types: CRC-5/USB and CRC-16/USB.
The CRC-16/USB is pretty straightforward. I have implemented it in [1] and it works fine with my captures. The CRC-5/USB is not so straightforward as it does not operate on the byte boundary. The CRC-5/USB is calculated on 11 bits of data. I think there are two possible approaches to check the CRC-5/USB in Wireshark: 1. Compute the CRC5 bitwise on the 11 bits of data, or 2. Compute the CRC5 with table-based algorithm on 2 bytes (11 bits data + 5 bits CRC) and relying on the CRC properties expect fixed output. Which approach would be preferred? Best Regards, Tomasz Moń [1] https://code.wireshark.org/review/#/c/34016/ ___________________________________________________________________________ Sent via: Wireshark-dev mailing list <wireshark-dev@wireshark.org> Archives: https://www.wireshark.org/lists/wireshark-dev Unsubscribe: https://www.wireshark.org/mailman/options/wireshark-dev mailto:wireshark-dev-requ...@wireshark.org?subject=unsubscribe
