mbtk/test/libgsw_lib/gsw_uuid_test.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>

#define CPMEM_DEVICE "/dev/cpmem"
#define CPLOAD_IOC_MAGIC 'Z'
#define CPLOAD_IOCTL_SET_CP_ADDR _IOW(CPLOAD_IOC_MAGIC, 1, int)
#define CPLOAD_IOCTL_GET_CP_FUSE _IOR(CPLOAD_IOC_MAGIC, 2, int)

static int getUniqueKey(unsigned char *key, int keylen)
{
    unsigned char ukey[24];
    int fd;

    if (keylen < 16)
    {
        fprintf(stderr, "Error: Key length must be at least 16 bytes.\n");
        return -1;
    }

    fd = open(CPMEM_DEVICE, O_RDONLY);
    if (fd == -1)
    {
        perror("Error opening device");
        return -1;
    }

    memset(ukey, 0, sizeof(ukey));

    if (ioctl(fd, CPLOAD_IOCTL_GET_CP_FUSE, ukey) == -1)
    {
        perror("Error in ioctl");
        close(fd);
        return -1;
    }

    close(fd);

    memcpy(key, ukey, 8);
    memcpy(&key[8], ukey, 8);

    return 0;
}

int main()
{
    unsigned char key[16];
    int ret;

    ret = getUniqueKey(key, sizeof(key));
    if (ret == 0)
    {
        printf("Unique Key: ");
        for (int i = 0; i < sizeof(key)/2; i++)
        {
            printf("%02x", key[i]);
        }
        printf("\n");
    }
    else
    {
        fprintf(stderr, "Failed to get unique key.\n");
        return EXIT_FAILURE;
    }

    return EXIT_SUCCESS;
}