DES加密程序Word格式文档下载.docx
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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}};
conststaticcharRar_Table[]={//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
conststaticcharExp_Table[]={//扩展置换
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};
conststaticcharP_Table[]={//P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
conststaticcharKeyRar_Table[]={
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};
//设置全局变量,16轮密钥
boolkey[16][48]={{0}};
voidByteToBit(bool*Out,char*In,intbits)//字节到位转换函数{
inti;
for(i=0;
i<
bits;
i++)
Out[i]=(In[i/8]>
>
(i%8))&
1;
}
voidBitToByte(char*Out,bool*In,intbits)//位到字节转换函数{
bits/8;
Out[i]=0;
Out[i/8]|=In[i]<
<
(i%8);
voidXor(bool*InA,constbool*InB,intlength)//按位异或{
for(inti=0;
length;
InA[i]^=InB[i];
}
voidkeyfc(char*In)//密钥生成函数{
inti,j=0,mov,k,m;
bool*key0=newbool[56];
bool*keyin=newbool[64];
booltemp;
ByteToBit(keyin,In,64);
//字节到位的转换
56;
i++)//密钥压缩为56位
key0[i]=keyin[KeyRar_Table[i]-1];
16;
i++)//16轮密钥产生
{
if(i==0||i==1||i==8||i==15)
mov=1;
else
mov=2;
for(k=0;
k<
mov;
k++)//分左右两块循环左移
for(m=0;
m<
8;
m++)
temp=key0[m*7];
for(j=m*7;
j<
m*7+7;
j++)
key0[j]=key0[j+1];
key0[m*7+6]=temp;
temp=key0[0];
27;
key0[m]=key0[m+1];
key0[27]=temp;
temp=key0[28];
for(m=28;
55;
key0[55]=temp;
for(j=0;
48;
j++)//压缩置换并储存
key[i][j]=key0[Rar_Table[j]-1];
delete[]key0;
delete[]keyin;
voidDES(charOut[8],charIn[8],boolType)//加密核心程序,Type=0时加密,反之解密{
bool*MW=newbool[64];
bool*tmp=newbool[32];
bool*PMW=newbool[64];
bool*kzmw=newbool[48];
bool*keytem=newbool[48];
bool*ss=newbool[32];
inthang,lie,i;
ByteToBit(PMW,In,64);
for(intj=0;
64;
MW[j]=PMW[IP_Table[j]-1];
//初始置换
bool*Li=&
MW[0],*Ri=&
MW[32];
i++)//右明文扩展置换
kzmw[i]=Ri[Exp_Table[i]-1];
if(Type==0)//DES加密过程
for(intlun=0;
lun<
lun++)
32;
ss[i]=Ri[i];
keytem[i]=key[lun][i];
Xor(kzmw,keytem,48);
/*S盒置换*/
hang=kzmw[i*6]*2+kzmw[i*6+5];
lie=kzmw[i*6+1]*8+kzmw[i*6+2]*4+kzmw[i*6+3]*2+kzmw[i*6+4];
tmp[i*4+3]=S_Box[i][(hang+1)*16+lie]%2;
tmp[i*4+2]=(S_Box[i][(hang+1)*16+lie]/2)%2;
tmp[i*4+1]=(S_Box[i][(hang+1)*16+lie]/4)%2;
tmp[i*4]=(S_Box[i][(hang+1)*16+lie]/8)%2;
i++)//P置换
Ri[i]=tmp[P_Table[i]-1];
Xor(Ri,Li,32);
//异或
i++)//交换左右明文
Li[i]=ss[i];
tmp[i]=Li[i];
Li[i]=Ri[i];
Ri[i]=tmp[i];
PMW[i]=MW[Final_Table[i]-1];
BitToByte(Out,PMW,64);
//位到字节的转换
else//DES解密过程
for(intlun=15;
lun>
=0;
lun--)
delete[]MW;
delete[]tmp;
delete[]PMW;
delete[]kzmw;
delete[]keytem;
delete[]ss;
boolRunDes(char*Out,char*In,intdatalength,char*Key,boolType)//加密运行函数,判断输
入以及对输入文本8字节分割
if(!
(Out&
&
In&
Key&
(datalength=(datalength+7)&
0xfffffff8)))
returnfalse;
keyfc(Key);
for(inti=0,j=datalength%8;
i<
j;
++i,Out+=8,In+=8)
DES(Out,In,Type);
returntrue;
intmain()
char*Ki=newchar[8];
charEnter[]="
ThisisthetestofDES!
"
;
char*Print=newchar[200];
intlen=sizeof(Enter);
inti_mf;
cout<
"
请输入密钥(8位):
<
\n"
for(i_mf=0;
i_mf<
i_mf++)
cin>
Ki[i_mf];
RunDes(Print,Enter,len,Ki,0);
//加密
----加密前----"
len;
Enter[i_mf];
\n\n"
----加密后----"
cout<
Print[i_mf];
//此处进行不同密钥输入测试
RunDes(Enter,Print,len,Ki,1);
//解密
----解密后----"
endl;
delete[]Ki;
delete[]Print;
return0;
二、程序编译、运行结果图: