DES.rar_des 加密与解密

#include <iostream> using namespace std; int IP[64] = { 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 IPR[64] = { 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 }; int S[8][4][16] = { // 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 }; int E[48] = { 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 P[32] = { 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 PC1[56] = { 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 PC2[48] = { 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 }; void convert(int a[],int b[],int c[],int n); //进行置换 void f(int r[],int Ki[],int F[]); //求出函数f void creatKi(int K[],int Ki[16][48]); //有密钥K找出每轮密钥 void encryption(int word[],int K[],int code[]);//加密 void decryption(int code[],int K[],int word[]);//解密 void convert(int a[],int b[],int c[],int n) { int i=0; for(;i<n;i++) { c[i]=a[b[i]-1]; } } void f(int r[],int Ki[],int F[]) { int i=0; int j=0; int l=0; int c=0; int temp=0; int Er[48]; convert(r,E,Er,48); int KEr[48]; for(i=0;i<48;i++) { if(Er[i]==Ki[i]) KEr[i]=0; else KEr[i]=1; } int SKEr[32]; for(i=0;i<48;i=i+6) { l=KEr[i]*2+KEr[i+5]; c=KEr[i+1]*8+KEr[i+2]*4+KEr[i+3]*2+KEr[i+4]; temp=S[i/6][l][c]; SKEr[j+3]=temp%2; SKEr[j+2]=int(temp/2)%2; SKEr[j+1]=int(temp/4)%2; SKEr[j]=int(temp/8)%2; j=j+4; } convert(SKEr,P,F,32); } void creatKi(int K[],int Ki[16][48]) { int i=0; int j=0; int a[16]; a[0]=1; for(i=1;i<16;i++) { if(i==1||i==8||i==15) a[i]=a[i-1]+1; else a[i]=a[i-1]+2; } int PC1K[56]; convert(K,PC1,PC1K,56); int movePC1K[56]; for(i=0;i<16;i++) { for(j=0;j<28;j++) { if(j-a[i]<0) { if (j-a[i]<-28) movePC1K[j-a[i]+56]=PC1K[j]; else movePC1K[j-a[i]+28]=PC1K[j]; } else movePC1K[j-a[i]]=PC1K[j]; } for(;j<56;j++) { if(j-a[i]<28) { if(j-a[i]<0) movePC1K[j-a[i]+56]=PC1K[j]; else movePC1K[j-a[i]+28]=PC1K[j]; } else movePC1K[j-a[i]]=PC1K[j]; } convert(movePC1K,PC2,Ki[i],48); } } void encryption(int word[],int K[],int code[]) { int i=0; int j=0; int k=0; int Ki[16][48]; creatKi(K,Ki); int IPword[64]; convert(word,IP,IPword,64); int F[32]; int L[17][32]; int R[17][32]; for(j=0;j<32;j++) { L[0][j]=IPword[j]; R[0][j]=IPword[j+32]; } for(i=1;i<17;i++) { for(j=0;j<32;j++) { L[i][j]=R[i-1][j]; } f(R[i-1],Ki[i-1],F); for(k=0;k<32;k++) { if(L[i-1][k]==F[k]) R[i][k]=0; else R[i][k]=1; } } int IPRcode[64]; for(j=0;j<32;j++) { IPRcode[j]=L[16][j]; } for(;j<64;j++) { IPRcode[j]=R[16][j-32]; } convert(IPRcode,IPR,code,64); cout<<"明文为："; for(i=0;i<64;i++) { cout<<word[i]; } cout<<endl; cout<<"密文为："; for(i=0;i<64;i++) { cout<<code[i]; } cout<<endl; } void decryption(int code[],int K[],int word[]) { int i=0; int j=0; int k=0; int IPRcode[64]; convert(code,IP,IPRcode,64); int Ki[16][48]; creatKi(K,Ki); int F[32]; int L[17][32]; int R[17][32]; for(j=0;j<32;j++) { L[16][j]=IPRcode[j]; R[16][j]=IPRcode[j+32]; } for(i=15;i>-1;i--) { for(j=0;j<32;j++) { R[i][j]=L[i+1][j]; } f(R[i],Ki[i],F); for(k=0;k<32;k++) { if(R[i+1][k]==F[k]) L[i][k]=0; else L[i][k]=1; } } int IPword[64]; for(j=0;j<32;j++) { IPword[j]=L[0][j]; } for(;j<64;j++) { IPword[j]=R[0][j-32]; } int word[64]; convert(IPword,IPR,word,64); cout<<"明文为："; for(i=0;i<64;i++) { cout<<word[i]; } cout<<endl; cout<<"密文为："; for(i=0;i<64;i++) { cout<<code[i]; } cout<<endl; } void main() { int K[64]; int word[64]; int i=0; for(i=0;i<64;i++) { K[i]=rand()%2; } for(i=0;i<64;i++) { word[i]=rand()%2; } int code[64]; encryption(word,K,code); int decode[64]; decryption(code,K,decode); }