How to calculate CRC?

Question

C++ / C#

there are bytes. I can't find how to fold them correctly, please tell me

Answer 1

The easiest option:

public static byte Crc(byte[] data)
{
    var result = (byte)0;
    foreach (var b in data)
        result = result ^ b;

    return result;
}

Answer 2

for byte arrays, the response is 14
00, 03, 01, 00, 00, 0x0C