DES加密码算法MFC类实现

// DesEncrypt.cpp: implementation of the CDesEncrypt class. // ////////////////////////////////////////////////////////////////////// #include "stdafx.h" #include "Des.h" #include "DesEncrypt.h" #ifdef _DEBUG #undef THIS_FILE static char THIS_FILE[]=__FILE__; #define new DEBUG_NEW #endif ////////////////////////////////////////////////////////////////////// // Construction/Destruction ////////////////////////////////////////////////////////////////////// CDesEncrypt::CDesEncrypt() { } CDesEncrypt::~CDesEncrypt() { } bool CDesEncrypt::DesGo(char *Out, char *In, long datalen, const char *Key, int keylen, bool Type) { if(!(Out && In && Key && (datalen=(datalen+7)&0xfffffff8))) return false; SetKey(Key, keylen); if(!DES3) { //1次DES for(long i=0,j=datalen>>3; i<j; ++i,Out+=8,In+=8) DES(Out, In, &SubKey[0], Type); } else { //3次DES 加密:加(key0)-解(key1)-加(key0);解密:解(key0)-加(key1)-解(key0) for(long i=0,j=datalen>>3; i<j; ++i,Out+=8,In+=8) { DES(Out, In, &SubKey[0], Type); DES(Out, Out, &SubKey[1], !Type); DES(Out, Out, &SubKey[0], Type); } } return true; } void CDesEncrypt::SetKey(const char *Key, int len) { memset(DesKey, 0, 16); memcpy(DesKey, Key, len>16?16:len); SetSubKey(&SubKey[0], &DesKey[0]); DES3 = len>8 ? (SetSubKey(&SubKey[1], &DesKey[8]), true) : false; } void CDesEncrypt::DES(char Out[], char In[], const PSubKey pSubKey, bool Type) { static bool M[64], temp[32], *Li=&M[0], *Ri=&M[32]; ByteToBit(M, In, 64); Transform(M, M, INITable, 64); if(Type == TRUE) { for(int i=0; i<16; ++i) { memcpy(temp, Ri, 32); Ffunc(Ri, (*pSubKey)[i]); Xor(Ri, Li, 32); memcpy(Li, temp, 32); } } else { for(int i=15; i>=0; --i) { memcpy(temp, Li, 32); Ffunc(Li, (*pSubKey)[i]); Xor(Li, Ri, 32); memcpy(Ri, temp, 32); } } Transform(M, M, IPRTable, 64); BitToByte(Out, M, 64); } void CDesEncrypt::SetSubKey(PSubKey pSubKey, const char Key[]) { 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) { RotateL(KL, 28, LOOP_Table[i]); RotateL(KR, 28, LOOP_Table[i]); Transform((*pSubKey)[i], K, PC2_Table, 48); } } void CDesEncrypt::Ffunc(bool In[], const bool Ki[]) { static bool MR[48]; Transform(MR, In, EXTTable, 48); Xor(MR, Ki, 48); Sfunc(In, MR); Transform(In, In, PBOXTable, 32); } void CDesEncrypt::Sfunc(bool Out[], const bool In[]) { 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, &SBox[i][j][k], 4); } } void CDesEncrypt::Transform(bool *Out, bool *In, const char *Table, int len) { for(int i=0; i<len; ++i) { Temp[i] = In[ Table[i]-1]; } memcpy(Out, Temp, len); } void CDesEncrypt::Xor(bool *InA, const bool *InB, int len) { for(int i=0; i<len; ++i) { InA[i] ^= InB[i]; } } void CDesEncrypt::RotateL(bool *In, int len, int loop) { memcpy(Temp, In, loop); memcpy(In, In+loop, len-loop); memcpy(In+len-loop, Temp, loop); } void CDesEncrypt::ByteToBit(bool *Out, const char *In, int bits) { for(int i=0; i<bits; ++i) { Out[i] = (In[i>>3]>>(i&7)) & 1; } } void CDesEncrypt::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); } }