// MatchTwoArray.cpp : 定义控制台应用程序的入口点。
//#include "stdafx.h"
#include<iostream>#include<stdio.h>#include<iomanip>#include<string>using namespace std; enum {ENCRYPTION,DECRYPTION};bool Using_DES(char *Out,char *In,long textlen,int keylen,const char *Key,bool Type = ENCRYPTION); // 初始置换（initial permutation）IP列表const static char IP_TABLE[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};// 扩展置换（expansion operation）E列表
static const char E_TABLE[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};//密钥置换PC1列表
const static char PC1_TABLE[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}; // 密钥置换中每轮移动的位数const static char LOOP_TABLE[16] = { 1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1}; // 压缩置换PC2列表const static char PC2_TABLE[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};// S-盒代替（substitution box）
const static char S_BOX[8][4][16] = { // S盒114, 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215, 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310, 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47, 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52, 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612, 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74, 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813, 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};// P-盒置换（straight permutation ）或称为直接置换const static char P_TABLE[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};// 末置换（final permutation）IP^-1列表const static char IPF_TABLE[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};//-----------------------------------------------------------------------------------typedef bool (*SUBKEY_P)[16][48];//-----------------------------------------------------------------------------------static void DES(char Out[8], char In[8], const SUBKEY_P pskey, bool Type);//标准DES加/解密static void SETKEY(const char* Key, int len);// 设置密钥static void Set_SubKey(SUBKEY_P pskey, const char Key[8]);// 设置子密钥static void F_FUNCTION(bool In[32], const bool Ki[48]);// f 函数完成扩展置换、S-盒代替和P盒置换static void S_BOXF(bool Out[32], const bool In[48]);// S-盒代替函数static void TRANSFORM(bool *Out, bool *In, const char *Table, int len);// 变换函数static void XOR(bool *InA, const bool *InB, int len);//异或函数static void CYCLELEFT(bool *In, int len, int loop);// 循环左移函数static void ByteToBit(bool *Out, const char *In, int bits);// 字节组转换成位组函数static void BitToByte(char *Out, const bool *In, int bits);// 位组转换成字节组函数//-----------------------------------------------------------------------------------static bool SubKey[1][16][48];// 子密钥static char T[256], deskey[16];//-----------------------------------------------------------------------------------//以下是各个函数的定义//-----------------------------------------------------------------------------------//加密/解密函数//bool Using_DES(char *Out, char *In, long textlen, int keylen,const char *Key, bool Type){ if( !( Out && In && Key && (textlen=(textlen+7)&0xfffffff8) ) ) return false; SETKEY(Key, keylen); for(long i=0,j=textlen>>3; i<j; ++i,Out+=8,In+=8) DES(Out, In, &SubKey[0], Type); // 1次DES return true;}void ByteToBit(bool *Out, const char *In, int bits){ for(int i=0; i<bits; ++i) Out[i] = (In[i>>3]>>(i&7)) & 1;}// 字节组转换成位组函数
void BitToByte(char *Out, const bool *In, int bits){ memset(Out, 0, bits>>3); for(int i=0; i<bits; ++i) Out[i>>3] |= In[i]<<(i&7);}// 循环左移函数
void CYCLELEFT(bool *In, int len, int loop){ memcpy(T, In, loop); memcpy(In, In+loop, len-loop); memcpy(In+len-loop, T, loop);}// 设置子密钥
void Set_SubKey(SUBKEY_P pskey, const char Key[8]){ static bool K[64], *KL=&K[0], *KR=&K[28]; ByteToBit(K, Key, 64); TRANSFORM(K, K, PC1_TABLE, 56); for(int i=0; i<16; ++i) { CYCLELEFT(KL, 28, LOOP_TABLE[i]); CYCLELEFT(KR, 28, LOOP_TABLE[i]); TRANSFORM((*pskey)[i], K, PC2_TABLE, 48); }}// 设置密钥
void SETKEY(const char* Key, int len){ memset(deskey, 0, 24); memcpy(deskey, Key, len>24?24:len); Set_SubKey(&SubKey[0], &deskey[0]);}void S_BOXF(bool Out[32], const bool In[48]){ for(char i=0,j,k; i<8; ++i,In+=6,Out+=4) { j = (In[0]<<1) + In[5]; k = (In[1]<<3) + (In[2]<<2) + (In[3]<<1) + In[4]; ByteToBit(Out, &S_BOX[i][j][k], 4); }}// f 函数完成扩展置换、S-盒代替和P盒置换
void F_FUNCTION(bool In[32], const bool Ki[48]){ static bool MR[48]; TRANSFORM(MR, In, E_TABLE, 48); XOR(MR, Ki, 48); S_BOXF(In, MR); TRANSFORM(In, In, P_TABLE, 32);}// 变换函数void TRANSFORM(bool *Out, bool *In, const char *Table, int len){ for(int i=0; i<len; ++i) T[i] = In[ Table[i]-1 ]; memcpy(Out, T, len);}void XOR(bool *InA, const bool *InB, int len){ for(int i=0; i<len; ++i) InA[i] ^= InB[i];}//标准DES加/解密
void DES(char Out[8], char In[8], const SUBKEY_P pskey, bool Type){ static bool M[64], tmp[32], *Li=&M[0], *Ri=&M[32]; ByteToBit(M, In, 64); TRANSFORM(M, M, IP_TABLE, 64); if( Type == ENCRYPTION ) { for(int i=0; i<16; ++i) { memcpy(tmp, Ri, 32); F_FUNCTION(Ri, (*pskey)[i]); XOR(Ri, Li, 32); memcpy(Li, tmp, 32); } } else { for(int i=15; i>=0; --i) { memcpy(tmp, Li, 32); F_FUNCTION(Li, (*pskey)[i]); XOR(Li, Ri, 32); memcpy(Ri, tmp, 32); } } TRANSFORM(M, M, IPF_TABLE, 64); BitToByte(Out, M, 64);} void main(){ char text[]="The Test of DES !\n" "姓名：许同学学号：0123456789\n" "华中科技大学\n" "合肥电大站\n" "Email: abc@.com\n" "Tel:027-0000000";char key[]="Tddfdf ",buf[255];
memset(buf, 0, sizeof(buf)); strcpy(buf, text); puts("\n加密前文本:"); puts(buf); printf("加密前文本长度：%d\n",sizeof(text)); puts("\n密钥:"); puts(key); printf("密钥文本长度：%d\n",sizeof(key)); Using_DES(buf, buf, sizeof(text), sizeof(key), key, ENCRYPTION); puts("\n加密后:"); puts(buf); Using_DES(buf, buf, sizeof(text),sizeof(key), key, DECRYPTION); puts("\n解密后文本:"); puts(buf); getchar();}