gistfile1.txt

#include <stdio.h>
main()
{
  unsigned char  base[] = {0x03, 0x10, 0x21, 0x44, 0xf0, 0xe1, 0x98, 0x21};
  unsigned char keys[8] = {0, 0, 0, 0, 0, 0, 0, 0};
  unsigned char key = 0xf0;

  unsigned char kt;
  unsigned char tmp = 0xff;

  int i;
  int j;
  for (i = 0; i < 8; i++) {
    for (j = 0; j < 8; j++) {
      keys[i] |= (base[j] & (1 << i) ? 1 << j : 0);
    }
  }
  printf("%x \n", keys[0]);
  printf("%x \n", keys[1]);
  printf("%x \n", keys[2]);
  printf("%x \n", keys[3]);

  kt = key;
  tmp &= (keys[0] ^ ~(-(kt & 1)));
  kt >>= 1;
  tmp &= (keys[1] ^ ~(-(kt & 1)));
  kt >>= 1;
  tmp &= (keys[2] ^ ~(-(kt & 1)));
  kt >>= 1;
  tmp &= (keys[3] ^ ~(-(kt & 1)));
  kt >>= 1;
  tmp &= (keys[4] ^ ~(-(kt & 1)));
  kt >>= 1;
  tmp &= (keys[5] ^ ~(-(kt & 1)));
  kt >>= 1;
  tmp &= (keys[6] ^ ~(-(kt & 1)));
  kt >>= 1;
  tmp &= (keys[7] ^ ~(-(kt & 1)));
  kt >>= 1;
  printf("%x \n", tmp);
}