#include <netinet/in.h>
u_int32_t fp_maskl[8][256];
          do_des(u_int32_t l_in, u_int32_t r_in, u_int32_t * l_out, u_int32_t * r_out,        int count) {
        u_int32_t l;
        u_int32_t r;
        	u_int32_t f;
        	int round;
        	if (count == 0) {
      while (round--) {
    			f ^= l;
    			r = f;
    		}
      	}
        	*l_out = 	    fp_maskl[0][l >> 24] | fp_maskl[1][(l >> 16) & 0xff] | 	    fp_maskl[2][(l >> 8) & 0xff] | fp_maskl[3][l & 0xff] | fp_maskl[4][r 									       >> 									       24] 	    | fp_maskl[5][(r >> 16) & 0xff] | fp_maskl[6][(r >> 8) & 0xff] | 	    fp_maskl[7][r & 0xff];
        }