DES加密算法C++程序

#include "stdio.h"   
#include "memory.h"   
#include "time.h"   
#include "stdlib.h"   
  
#define PLAIN_FILE_OPEN_ERROR -1   
#define KEY_FILE_OPEN_ERROR -2   
#define CIPHER_FILE_OPEN_ERROR -3   
#define OK 1      

typedef char ElemType;  

//下面是变量的声明

 //初始置换表IP   
int IP_Table[64] = {  57,49,41,33,25,17,9,1,   
                     59,51,43,35,27,19,11,3,   
                     61,53,45,37,29,21,13,5,   
                     63,55,47,39,31,23,15,7,   
                     56,48,40,32,24,16,8,0,   
                     58,50,42,34,26,18,10,2,   
                     60,52,44,36,28,20,12,4,   
                     62,54,46,38,30,22,14,6};    
//逆初始置换表IP^-1   
int IP_1_Table[64] = {39,7,47,15,55,23,63,31,   
   38,6,46,14,54,22,62,30,   
   37,5,45,13,53,21,61,29,   
   36,4,44,12,52,20,60,28,   
   35,3,43,11,51,19,59,27,   
   34,2,42,10,50,18,58,26,   

   33,1,41,9,49,17,57,25,   
   32,0,40,8,48,16,56,24};   
  
//扩充置换表E   
int E_Table[48] = {31, 0, 1, 2, 3, 4,   
                  3,  4, 5, 6, 7, 8,   
                  7,  8,9,10,11,12,   
                  11,12,13,14,15,16,   
                  15,16,17,18,19,20,   
                  19,20,21,22,23,24,   
                  23,24,25,26,27,28,   
                  27,28,29,30,31, 0};   
  
//置换函数P   
int P_Table[32] = {15,6,19,20,28,11,27,16,   
                  0,14,22,25,4,17,30,9,   
                  1,7,23,13,31,26,2,8,   
                  18,12,29,5,21,10,3,24};   
  
//S盒   
int S[8][4][16] =//S1   
            {{{14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7},   
              {0,15,7,4,14,2,13,1,10,6,12,11,9,5,3,8},   
                {4,1,14,8,13,6,2,11,15,12,9,7,3,10,5,0},   
                {15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13}},   
                //S2   
              {{15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10},   
              {3,13,4,7,15,2,8,14,12,0,1,10,6,9,11,5},   
              {0,14,7,11,10,4,13,1,5,8,12,6,9,3,2,15},   
              {13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9}},