DES加密算法与解密带流程图.docx
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DES加密算法与解密带流程图.docx
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DES加密算法与解密带流程图
一、DES加密及解密算法程序源代码:
#include
usingnamespacestd;
conststaticcharIP_Table[]={//IP_Table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
};
conststaticcharFinal_Table[]={//最终置换
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
};
conststaticcharS_Box[8][64]={//s_box
/*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}
};
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 Out[i]=(In[i/8]>>(i%8))&1; } voidBitToByte(char*Out,bool*In,intbits)//位到字节转换函数 { inti; for(i=0;i Out[i]=0; for(i=0;i Out[i/8]|=In[i]<<(i%8); } voidXor(bool*InA,constbool*InB,intlength)//按位异或 { for(inti=0;i 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 for(i=0;i<56;i++)//密钥压缩为56位 key0[i]=keyin[KeyRar_Table[i]-1]; for(i=0;i<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 { for(m=0;m<8;m++) { temp=key0[m*7]; for(j=m*7;j key0[j]=key0[j+1]; key0[m*7+6]=temp; } temp=key0[0]; for(m=0;m<27;m++) key0[m]=key0[m+1]; key0[27]=temp; temp=key0[28]; for(m=28;m<55;m++) key0[m]=key0[m+1]; key0[55]=temp; } for(j=0;j<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;j<64;j++) { MW[j]=PMW[IP_Table[j]-1];//初始置换 } bool*Li=&MW[0],*Ri=&MW[32]; for(i=0;i<48;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<16;lun++) { for(i=0;i<32;i++) ss[i]=Ri[i]; for(i=0;i<48;i++)//右明文扩展置换 kzmw[i]=Ri[Exp_Table[i]-1]; for(i=0;i<48;i++) keytem[i]=key[lun][i]; Xor(kzmw,keytem,48); /*S盒置换*/ for(i=0;i<8;i++) { 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; } for(i=0;i<32;i++)//P置换 Ri[i]=tmp[P_Table[i]-1]; Xor(Ri,Li,32);//异或 for(i=0;i<32;i++)//交换左右明文 { Li[i]=ss[i]; } } for(i=0;i<32;i++) { tmp[i]=Li[i]; Li[i]=Ri[i]; Ri[i]=tmp[i]; } for(i=0;i<64;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--) { for(i=0;i<32;i++) ss[i]=Ri[i]; for(i=0;i<48;i++)//右明文扩展置换 kzmw[i]=Ri[Exp_Table[i]-1]; for(i=0;i<48;i++) keytem[i]=key[lun][i]; Xor(kzmw,keytem,48); /*S盒置换*/ for(i=0;i<8;i++) { 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; } for(i=0;i<32;i++)//P置换 Ri[i]=tmp[P_Table[i]-1]; Xor(Ri,Li,32);//异或 for(i=0;i<32;i++)//交换左右明文 { Li[i]=ss[i]; } } for(i=0;i<32;i++) { tmp[i]=Li[i]; Li[i]=Ri[i]; Ri[i]=tmp[i]; } for(i=0;i<64;i++) PMW[i]=MW[Final_Table[i]-1]; BitToByte(Out,PMW,64);//位到字节的转换 } 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 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<8;i_mf++) cin>>Ki[i_mf]; cout<<"\n"; RunDes(Print,Enter,len,Ki,0);//加密 cout<<"----加密前----"<<"\n"; for(i_mf=0;i_mf cout< cout<<"\n\n"; cout<<"----加密后----"<<"\n"; for(i_mf=0;i_mf cout< cout<<"\n\n"; //此处进行不同密钥输入测试 cout<<"请输入密钥(8位): "<<"\n"; for(i_mf=0;i_mf<8;i_mf++) cin>>Ki[i_mf]; cout<<"\n"; RunDes(Enter,Print,len,Ki,1);//解密 cout<<"----解密后----"<<"\n"; for(i_mf=0;i_mf cout< cout< delete[]Ki; delete[]Print; return0; } 二、程序编译、运行结果图: 三、程序总体框架图: 四、程序实现流程图:
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