# DES加密解密的C++源程序

wangqi123 贡献于2015-01-15

﻿ DES加密解密的C++源程序 --测试版本，希望大家多多交流 #include #include"stdio.h" #include"math.h" #include "string.h" static char key[16][48]; static char Hex[16][4]; ////IP置换。 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 \ }; //IP-1置换。可根据IP表生成 int IP_1[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 \ }; //E扩展 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 }; //PC-1置换。 int PC_1[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 }; //PC-2置换。 int PC_2[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 }; //P置换 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 S[8][4][16] = //S盒1。 S盒都可以自己设置 { 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, //S盒2 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, //S盒3 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, //S盒4 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, //S盒5 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, //S盒6 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, //S盒7 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, //S盒8 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 }; void Init_Hex() { } void LS(char src[28],char dist[28],int n) //将28比特的字符串循环左移n位 { for(int i=0;i<28;i++) dist[i] = src[(28-n+i)%28]; } void Decompose_56(char src[56],char dist1[28],char dist2[28]) //将56比特的字符串分解为2个28比特的字符串 { } void Decompose_64(char src[64],char dist1[32],char dist2[32]) //将一个64比特的字符串分解为两个32位的字符串 {} void Combine_56(char src1[28],char src2[28],char dist[56]) //将两个28比特的字符串合并成一个56比特的字符串 {} void Combine_64(char src1[32],char src2[32],char dist[64]) //将两个32比特的字符串合并成一个64比特的字符串 { for(int i=0;i<32;i++) dist[i] = src1[i]; for(int j=32;j<64;j++) dist[j] = src2[j-32]; } void PC_1_Permutation(char src[64],char dist[56]) //PC-1置换 { for(int i=0;i<56;i++) dist[i] = src[PC_1[i]-1]; } void PC_2_Permutation(char src[56],char dist[48]) //PC-2置换 { for(int i=0;i<64;i++) dist[i] = src[PC_2[i]-1]; } void IP_Permutation(char src[64],char dist[64]) //IP置换 { for(int i=0;i<64;i++) dist[i] = src[IP[i]-1]; } void IP_1_Permutation(char src[64],char dist[64]) //IP的逆置换 { for(int i =0;i<64;i++) dist[i]=src[IP_1[i]-1]; } void E_Permutation(char src[32],char dist[48]) //E置换 { for(int i=0;i<48;i++) dist[i] = src[E[i]-1]; } void P_Permutation(char src[32],char dist[32]) //P置换 { for(int i=0;i<32;i++) dist[i] = src[P[i]-1]; } void StrCpy(char src[],char dist[],int n) //字符串的复制 { for(int i=0;i