http://www.21ic.com/tools/HotWC3_V1.23.html

它可以自动生成任意CRC表格或C语言源码。

翻译了一下，可以了，我也在研究这个，多交流：

#include <windows.h>
#include <stdio.h>

long long Crc64Long(char *instr)
{
    long long CRCTable[256] = { 0 };
    long long INITIALCRC = -1;
    long long PLOY64REV = -7661587058870466123LL;
    BOOL init = FALSE;
    if (instr == NULL)
    {
        return 0;
    }
    long long crc = -1;
    if (!init)
    {
        for (int i = 0; i < 256; i++)
        {
            long long part = (long long)i;
            for (int j = 0; j < 8; j++)
            {
                if ((((int)part) & 1) != 0)
                {
                    part = (part >> 1) ^ PLOY64REV;
                }
                else
                {
                    part >>= 1;
                }
            }
            CRCTable[i] = part;
        }
        init = TRUE;
    }
    int length = strlen(instr);
    for (int k = 0; k < length; k++)
    {
        crc = CRCTable[(((int)crc) ^ instr[k]) & 255] ^ (crc >> 8);
    }
    return crc;
}

char * Crc64String(char *instr)
{
    char *outstr = (char *)malloc(21*sizeof(char));
    long long Crc64Val = Crc64Long(instr);
    //printf("'%s' CRC64 => %lld\n", instr, Crc64Val);
    if (Crc64Val > 0LL)
    {
        sprintf_s(outstr, 21, "%llx", Crc64Val);
    }
    else
    {
        sprintf_s(outstr, 21, "-%llx", -Crc64Val);
    }

    return outstr;
}

int main(int argc, char* argv[])
{
    if (argc < 2)
    {
        printf("Usage : Crc64String [stringNeedCalc]\n");
        return -1;
    }
    char *stringNeedCalc = argv[1];
    printf("'%s' CRC64 is : %s\n", stringNeedCalc, Crc64String(stringNeedCalc));
    getchar();
}