DES加密算法的实现(详细版)

v3DES加密算法的实现毕业论文一、DES加密及解密算法程序源代码：#includeiostreamusingnamespacestd;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;ibits;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;ibits/8;i++)Out[i]=0;for(i=0;ibits;i++)Out[i/8]|=In[i](i%8);}voidXor(bool*InA,constbool*InB,intlength)//按位异或{for(inti=0;ilength;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;i56;i++)//密钥压缩为56位key0[i]=keyin[KeyRar_Table[i]-1];for(i=0;i16;i++)//16轮密钥产生{if(i==0||i==1||i==8||i==15)mov=1;elsemov=2;for(k=0;kmov;k++)//分左右两块循环左移{for(m=0;m8;m++){temp=key0[m*7];for(j=m*7;jm*7+7;j++)key0[j]=key0[j+1];key0[m*7+6]=temp;}temp=key0[0];for(m=0;m27;m++)key0[m]=key0[m+1];key0[27]=temp;temp=key0[28];for(m=28;m55;m++)key0[m]=key0[m+1];key0[55]=temp;}for(j=0;j48;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;j64;j++){MW[j]=PMW[IP_Table[j]-1];//初始置换}bool*Li=&MW[0],*Ri=&MW[32];for(i=0;i48;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;lun16;lun++){for(i=0;i32;i++)ss[i]=Ri[i];for(i=0;i48;i++)//右明文扩展置换kzmw[i]=Ri[Exp_Table[i]-1];for(i=0;i48;i++)keytem[i]=key[lun][i];Xor(kzmw,keytem,48);/*S盒置换*/for(i=0;i8;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;i32;i++)//P置换Ri[i]=tmp[P_Table[i]-1];Xor(Ri,Li,32);//异或for(i=0;i32;i++)//交换左右明文{Li[i]=ss[i];}}for(i=0;i32;i++){tmp[i]=Li[i];Li[i]=Ri[i];Ri[i]=tmp[i];}for(i=0;i64;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;i32;i++)ss[i]=Ri[i];for(i=0;i48;i++)//右明文扩展置换kzmw[i]=Ri[Exp_Table[i]-1];for(i=0;i48;i++)keytem[i]=key[lun][i];Xor(kzmw,keytem,48);/*S盒置换*/for(i=0;i8;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;i32;i++)//P置换Ri[i]=tmp[P_Table[i]-1];Xor(R