📄 des加密算法.cpp
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#include <stdio.h>
#include <string.h>
unsigned __int64 MAP[65] , key[17]={0} ;
int IP[8][8]={ //数据加密初始置换
{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}
};
int PC1[8][7]={ //密钥的置换
{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}
};
int TR[16]={1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};//循环左移的位数
int PC2[8][6]={ // 密钥的压缩置换
{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}
};
int E[8][6]={
//扩展置换（e盒置换）
{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}
};
int S[8][4][16]={ //8个s盒置换
{
{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},
},
{
{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},
},
{
{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},
},
{
{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},
},
{
{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}
}
};
int P[8][4]={ //p盒置换
{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}
};
int IP_1[8][8]={ //逆初始置换
{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}
};
void getkey( unsigned __int64 *); //计算16个子密钥
void ip( unsigned __int64 * );
void pc1(unsigned __int64 * ,unsigned int * ,unsigned int*);
unsigned __int64 tran(unsigned int i ,unsigned int *c , unsigned int * );
void pc2( unsigned __int64 *);
void et( unsigned int * ,unsigned __int64 * );
void so( unsigned __int64 *);
void p(unsigned __int64 * );
void ip1(unsigned __int64 * );
void func( unsigned int ,unsigned int *);
int main()
{
//对MAP 数组初始化
unsigned int i, c,d ,L , R ,temp;
unsigned __int64 k=1;
for( i=64 ; i>=1 ;i--)
{
MAP[i]=k;
k*=2;
}
MAP[0]=0;
unsigned __int64 message , key , rmg , rmessage , mg;
char str[12]={0};
FILE *fp , *fp1;
printf("-----------------------------------------------\n");
puts(" 请输入密钥:\n");
scanf("%I6d" , &key );//接收密钥
puts(" 请输入待加密的明文文件（txt文件）\n");
scanf("%s" , str );
getkey( &key ); //计算16个子密钥
if(!(fp=fopen(str ,"r")))
printf("can not open the file \n");
if(!(fp1=fopen( "result.txt" ,"w+")))
printf("can not open the file \n");
while(!feof(fp))//取得带加密的明文
{
int k=0 , m=0;
mg=0;
while(!feof(fp)&&k<8)
{
m=fgetc(fp);
if(m!=-1)
{
mg=mg<<8;
mg=mg|m;
k++;
}
else
break;
}
message=mg;
//加密部分
// printf("原来的数据为:%I64d \n" ,message );
//printf("%I64d %I64d " ,message , key );
ip( &message ); //变换初始待加密文
//pc1( &key , &c, &d ); //密钥置换64位->56位
L=R=0;// 将数据块分成2个部分
R=0x00000000ffffffff&message;
L=0x00000000ffffffff&(message>>32);
//printf("%I64d %d %d " , message , L, R );
for( i =1 ; i<=16 ; i++)
{
//printf("第 %d 次加密\n" , i );
temp=R;
func( i , &R );
//fun( i , &R , &c , &d ); //经过fun()函数后,R已经改变了,为F(R,K)
R=R^L;
L=temp;
//printf("L是 %d , R是%d \n" , L, R );
}
rmg=0;
rmg=rmg|R; //最后一次是按R,L的顺序合成,而不是L,R
rmg=rmg<<32;
rmg=rmg|L;
ip1( &rmg );//末置换加密数据
//printf("加密后的数据为:%I64d\n" , rmg );
for( i=0 ; i<8 ; i++)
{
char ch=0x00000000000000ff&(rmg>>56);
rmg=rmg<<8;
fprintf( fp1 , "%c" , ch );
}
//printf(" %I64d" , rmg );
}
fclose(fp);
fclose(fp1);
puts("加密结束.....请查看密文result.txt\n");
if(!(fp=fopen("result.txt" ,"r")))
printf("can not open the file \n");
if(!(fp1=fopen("Dresult.txt" ,"w+")))
printf("can not open the file \n");
while(!feof(fp))
{
int k=0 , m=0 ,tag=0 ;
mg=0;
while(!feof(fp)&&k<8)
{
m=fgetc(fp);
if(m!=-1)
{
mg=mg<<8;
mg=mg|m;
k++;
}
else
{tag=1; break;}
}
if(tag)
break;
rmg=mg;
//解密部分
ip( &rmg);
L=R=0;
temp=0;
R=0x00000000ffffffff&rmg;
L=0x00000000ffffffff&(rmg>>32);
for( i=16 ; i>=1 ; i-- )
{
//printf("第 %d 次解密 \n" , i );
temp=R;
func( i , &R );
R=L^R;
L=temp;
//printf("L是 %d , R是%d \n" , L, R );
}
rmessage=0;
rmessage=rmessage|R;
rmessage=rmessage<<32;
rmessage=rmessage|L;
ip1(&rmessage);
//printf("解密后的数据为 :%I64d \n " , rmessage );
for( i=0 ; i<8 ; i++)
{
char ch=0x00000000000000ff&rmessage>>56;
rmessage=rmessage<<8;
if(ch!=0)
fprintf( fp1 , "%c" , ch );
}
//printf(" %I64d \n" ,rmessage );
}
fclose(fp);
fclose(fp1);
puts("解密结束......请查看解密所得文件Dresult.txt\n");
return 0;
}
void ip( unsigned __int64 *mg )
{
unsigned __int64 t1=0;
for( int i=0 ; i<8 ; i++)
for( int j=0 ; j<8; j++)
{
if(MAP[IP[i][j]]&*mg) //映射到第IP[i][j],判断此位是否为1 ,分别操作
t1=t1|MAP[i*8+j+1] ;
}
*mg=t1;
}
void pc1(unsigned __int64 *k , unsigned int*c , unsigned int *d ) //将64位密钥压缩为56位,并分成c,d各28位
{
unsigned int i , j;
*c=*d=0;
//得到左边28位
for( i=0 ; i<4 ; i++)
for( j=0 ; j<7 ; j++)
{ //从左往右为第一位到第28位
*c=*c<<1;
if(MAP[PC1[i][j]]&*k)
*c=*c|1;
}
//得到右边28位
for( i=4 ; i<8 ; i++)
for( j=0 ; j<7 ; j++ )
{
*d=*d<<1;
if(MAP[PC1[i][j]]&*k)
//*d=*d|MAP[(i-4)*7+j+1-32];
*d=*d|1;
}
}
unsigned __int64 tran( unsigned int i , unsigned int *c , unsigned int *d ) //返回56位数据
{
unsigned __int64 k=0;
unsigned int j , m=0 ;
j=TR[i-1]; //TR从0开始
*c=*c&0x0fffffff;
*d=*d&0x0fffffff;
while(m<j)
{ //循环左移
if(*c&0x08000000) //134217728为2的27次幂
{
*c=*c<<1;
*c=*c&0x0fffffff; //第29位清零
*c=*c|1;
}
else
*c=*c<<1;
if(*d&0x08000000)
{
*d=*d<<1;
*d=*d&0x0fffffff;
*d=*d|1;
}
else
*d=*d<<1;
m++;
}
//将*c ,*d合并
k=k|*c;
k=k<<28;
k=k|*d;
return k;
}
void pc2(unsigned __int64 *k) //将56位压缩位48位
{
unsigned __int64 ky=0;
int i , j;
for( i=0 ; i<8 ; i++)
for( j=0 ; j<6 ; j++)
{ ky=ky<<1;
if(MAP[PC2[i][j]+8]&*k) //这里注意了 ,现在是将56位压缩为48为,存贮这56位是从17位开始到64位 ,所以+16
ky=ky|1;
}
*k=ky;
}
void et(unsigned int *r,unsigned __int64 *rr)//将32位扩展为48位
{
int i , j ;
*rr=0;
for( i =0 ; i< 8 ; i++)
for( j=0 ; j<6 ; j++)
{
*rr=*rr<<1;
if(MAP[E[i][j]+32]&*r)
*rr=*rr|1;
}
}
void so( unsigned __int64 * k ) //将48位数据通过s盒压缩为32位
{
__int64 mg;
mg=*k;
*k=0;
int i , m , n;
m=n=0;
mg=mg<<16;
for( i=0 ; i<8 ; i++ )
{
if(mg&MAP[1])
if(mg&MAP[6])
m=3;
else
m=2;
else
if(mg&MAP[6])
m=1;
else
m=0;
n=0x000000000000000f&(mg>>59);
//n=n&0x0000000f; //最高位置0
*k=*k<<4;
*k=*k|S[i][m][n];
mg=mg<<6;//处理下面6位
m=n=0;//每次用过之后清零, 否则m , n出错
}
*k=*k&0x00000000ffffffff;
}
void p(unsigned __int64 * mg) //将32转换为32位
{
unsigned int i , j ;
unsigned __int64 k=0;
for( i=0 ; i<8 ; i++)
for( j=0 ; j<4 ; j++)
{
k=k<<1;
if(MAP[P[i][j]+32]&*mg)
k=k|1;
}
*mg=k;
}
void ip1( unsigned __int64 *rmg) //IP1盒转换
{
unsigned __int64 t , t1=0;
t=*rmg;
unsigned int i , j ;
for( i=0 ; i<8 ; i++ )
for( j=0 ; j<8 ; j++ )
{
if(MAP[IP_1[i][j]]&t)
t1=t1|MAP[i*8+j+1] ;
//else
//t1=t1&~MAP[i*8+j+1];
}
*rmg=t1;
}
void func( unsigned int i , unsigned int *L )
{
unsigned __int64 k=0 , LR=0; // RL为扩充后的48位数据
k=key[i];
//printf(" 密钥是 %I64d \n" , k );
et(L , &LR);
k=LR^k;
so(&k);//s盒置换
p(&k);//p盒置换
*L=0x00000000ffffffff&k;
}
void getkey( unsigned __int64 * k )
{
int i ;
unsigned int c=0 , d=0;
unsigned __int64 x=0;
pc1( k , &c , &d );
for(i=1 ; i<=16 ; i++ )
{
x=tran( i , &c , &d ); //c ,d 实际使用28位
pc2( &x ); //得到密钥48位
key[i]=x; //存储16个密钥,供解密时直接使用
}
}⌨️ 快捷键说明
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