DES加密解密C++
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#include
#include
#include
void show1() //主界面
{
printf("\n\n\n\t\t*************** DES加密解密系统******************\n\n");
printf("\t\t--------------------------------------------------\n");
//printf("\t\t--------------------------------------------------\n");
printf("\t\t**************************************************\n");
printf("\t\t**\t\t\t\t\t\t**\n");
printf("\t\t**\t\t\t\t\t\t**\n");
printf("\t\t**\t\t\t1.加密\t\t\t**\n");
printf("\t\t**\t\t\t\t\t\t**\n");
printf("\t\t**\t\t\t2.解密\t\t\t**\n");
printf("\t\t**\t\t\t\t\t\t**\n");
printf("\t\t**\t\t\t3.退出\t\t\t**\n");
printf("\t\t**\t\t\t\t\t\t**\n");
printf("\t\t**\t\t\t\t\t\t**\n");
printf("\t\t--------------------------------------------------\n");
}
void show2() //加密界面
{
printf("\n\n\n\t\t****************** DES加密**********************\n\n");
printf("\t\t--------------------------------------------------\n");
printf("\t\t**************************************************\n");
printf("\t\t**\t\t\t\t\t\t**\n");
printf("\t\t**\t请选择明文和密钥的输入方式:\t\t**\n");
printf("\t\t**\t\t\t\t\t\t**\n");
printf("\t\t**\t\t1.直接输入\t\t\t**\n");
printf("\t\t**\t\t\t\t\t\t**\n");
printf("\t\t**\t\t2.从文件读取\t\t\t**\n");
printf("\t\t**\t\t\t\t\t\t**\n");
printf("\t\t**\t\t3.退出\t\t\t\t**\n");
printf("\t\t**\t\t\t\t\t\t**\n");
printf("\t\t--------------------------------------------------\n");
printf("\t\t\t选择:");
}
void reader(char str[30],char s[8]) //读取明文和密钥
{
FILE *fp;
fp=fopen(str,"r");
if(fp==NULL)
{
printf("明文读取失败!\n");
}
else
{
fscanf(fp,"%s",s);
}
fclose(fp);
}
void To2Bin(char p[8],int b[64]) //将字节转换成二进制流{
int i,k=0;
for(i=0;i<8;i++)
{
int j=0x80;
for(;j;j>>=1)
{
if(j&p[i])
{
b[k++]=1;
}
else
{
b[k++]=0;
}
}
}
}
int IP_Table[64] = //初始置换(IP)
{
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
};
int E_Table[] = { //扩展变换E
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
};
int S_Box[8][4][16] = { //8个s盒
{
{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}
},
{
{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}
},
{
{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}
},
{
{ 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}
},