DES算法的加密与解密(C++代码)

《信息安全技术》实验四:DES算法的使用

程序说明:

1、输入的明文长度大于0即可,明文可以带空格;

2、输入的明文支持汉字;

3、输出密文默认为二进制字符串;

4、输入密文要求为二进制字符串且长度为64的倍数,否则解密会出错。

程序代码:

#include
#include
#include
#include
using namespace std;
//模式标记
int flag;
string k[16];
//PC1选位表
int pc1Table[56]=
{
    57,49,41,33,25,17,9,1,
    58,50,42,34,26,18,10,2,
    59,51,43,35,27,19,11,3,
    60,52,44,36,63,55,47,39,
    31,23,15,7,62,54,46,38,
    30,22,14,6,61,53,45,37,
    29,21,13,5,28,20,12,4
};
//左移位数表
int loopTable[16]=
{
    1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1
};
//PC2选位表
int pc2Table[48]=
{
    14,17,11,24,1,5,
    3,28,15,6,21,10,
    23,19,12,4,26,8,
    16,7,27,20,13,2,
    41,52,31,37,47,55,
    30,40,51,45,33,48,
    44,49,39,56,34,53,
    46,42,50,36,29,32
};
//置换IP表
int ipTable[64]=
{
    58,50,42,34,26,18,10,2,
    60,52,44,36,28,20,12,4,
    62,54,46,38,30,22,14,6,
    64,56,48,40,32,24,16,8,
    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
};
//扩展置换表
int extendTable[48]=
{
    32,1,2,3,4,5,
    4,5,6,7,8,9,
    8,9,10,11,12,13,
    12,13,14,15,16,17,
    16,17,18,19,20,21,
    20,21,22,23,24,25,
    24,25,26,27,28,29,
    28,29,30,31,32,1
};
//S盒
int sBox[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,
    //S3
    10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8,
    13,7,0,9,3,4,6,10,2,8,5,14,12,11,15,1,
    13,6,4,9,8,15,3,0,11,1,2,12,5,10,14,7,
    1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12,
    //S4
    7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15,
    13,8,11,5,6,15,0,3,4,7,2,12,1,10,14,9,
    10,6,9,0,12,11,7,13,15,1,3,14,5,2,8,4,
    3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14,
    //S5
    2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9,
    14,11,2,12,4,7,13,1,5,0,15,10,3,9,8,6,
    4,2,1,11,10,13,7,8,15,9,12,5,6,3,0,14,
    11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3,
    //S6
    12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11,
    10,15,4,2,7,12,9,5,6,1,13,14,0,11,3,8,
    9,14,15,5,2,8,12,3,7,0,4,10,1,13,11,6,
    4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13,
    //S7
    4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1,
    13,0,11,7,4,9,1,10,14,3,5,12,2,15,8,6,
    1,4,11,13,12,3,7,14,10,15,6,8,0,5,9,2,
    6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12,
    //S8
    13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7,
    1,15,13,8,10,3,7,4,12,5,6,11,0,14,9,2,
    7,11,4,1,9,12,14,2,0,6,10,13,15,3,5,8,
    2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11
};
//P换位表
int pTable[32]=
{
    16,7,20,21,
    29,12,28,17,
    1,15,23,26,
    5,18,31,10,
    2,8,24,14,
    32,27,3,9,
    19,13,30,6,
    22,11,4,25
};
//逆置换IP^-1表
int ipReverseTable[64]={
    40,8,48,16,56,24,64,32,
    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
};
//字符转二进制
string charToBinary(char c)
{
    int i,b=c,k=0,flag=0;
    string result;
    if(b<0)
    {
        b=-b;
        flag=1;
    }
    while(k<8)
    {
        if(b)
        {
            result+=((b%2)+'0');
            b/=2;
        }
        else result+='0';
        k++;
    }
    //汉字字符处理
    if(flag)
    {
        for(i=0;i=0;i--)
    {
        result+=((s[i]-'0')*p);
        p*=2;
    }
    return result;
}
//整型转二进制
string intToBinary(int i)
{
    int k=0;
    string result;
    while(k<4)
    {
        if(i)
        {
            result+=((i%2)+'0');
            i/=2;
        }
        else result+='0';
        k++;
    }
    reverse(result.begin(),result.end());
    return result;
}
//异或运算
string xorAB(string a,string b)
{
    int i;
    string result;
    for(i=0;i>miyao)
    {
        if(miyao.length()<9) break;
        else cout<<"密钥不能超过8位,请重新输入:";
    }
    for(i=0;i>flag;
        if(!flag) break;
        else if((flag!=1)&&(flag!=2))
        {
            cout<<"输入不合法,请重新输入!"<>wenString;
                for(i=0;i*64

程序测试:

DES算法的加密与解密(C++代码)_第1张图片

 

你可能感兴趣的:(信息安全技术,密码学,信息安全,加密解密,算法)