一个用C++实现的MD5类

//Filename: CMd5.h#include <windows.h>#include <fstream>using namespace std;#define S11 7#define S12 12#define S13 17#define S14 22#define S21 5#define S22 9#define S23 14#define S24 20#define S31 4#define S32 11#define S33 16#define S34 23#define S41 6#define S42 10#define S43 15#define S44 21typedef LONGLONG LONG64;#define ENGLISH //指定错误信息为英文class CMd5{public:CMd5();CMd5(char *filename);~CMd5();LPCSTR TargetFile(char *filename=NULL); //求文件的MD5值void TargetStr(LPCSTR str); //求字符串的MD5值LPCSTR GetDigestKey(); //得到所求结果LPCSTR GetErr();private:inline ULONG LRotate(ULONG Sdata,int nBit);inline ULONG F(ULONG x,ULONG y,ULONG z);inline ULONG G(ULONG x,ULONG y,ULONG z);inline ULONG H(ULONG x,ULONG y,ULONG z);inline ULONG I(ULONG x,ULONG y,ULONG z);inline void FF(ULONG &a,ULONG b,ULONG c,ULONG d,ULONG Msg,int nBit,ULONG Cnt); inline void GG(ULONG &a,ULONG b,ULONG c,ULONG d,ULONG Msg,int nBit,ULONG Cnt); inline void HH(ULONG &a,ULONG b,ULONG c,ULONG d,ULONG Msg,int nBit,ULONG Cnt); inline void II(ULONG &a,ULONG b,ULONG c,ULONG d,ULONG Msg,int nBit,ULONG Cnt);bool Init();bool OpenFile();bool Read64Byte();void TransForm();bool CaculateFile();bool CaculateStr(LPCSTR str);void SetErr(int nErr);void JustifytoStr();fstream Sfile;ULONG *pM;LPVOID Pointer;ULONG T[4];bool IsSuc;char fname[MAX_PATH];LONG64 FileLen;static const ULONG Context[4];static const LPSTR ErrInfo[5][2];char strErr[50];char Digest[33];};

 

//Filename: CMd5.cpp#include "CMd5.h"const ULONG CMd5::Context[4] = { 0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476 };const LPSTR CMd5::ErrInfo[5][2] = {{"",""},{"The Memory is not enough !","内存分配失败!"},{"Have not assign a file !","未指定文件!"},{"Have not assign the text !","未指定文本!"},{"Have something wrong with MD5!","有错误发生!"},};//==========================<内联函数实现>=========================================ULONG CMd5::LRotate(ULONG Sdata,int nBit){return (Sdata<<nBit)|(Sdata>>(32-nBit));}ULONG CMd5::F(ULONG x,ULONG y,ULONG z){return (x&y)|((~x)&z);}ULONG CMd5::G(ULONG x,ULONG y,ULONG z){return (x&z)|(y&(~z));}ULONG CMd5::H(ULONG x,ULONG y,ULONG z){return x^y^z;}ULONG CMd5::I(ULONG x,ULONG y,ULONG z){return y^(x|(~z));}void CMd5::FF(ULONG &a,ULONG b,ULONG c,ULONG d,ULONG Msg,int nBit,ULONG Cnt){a+=F(b,c,d)+Msg+(ULONG)Cnt;a=LRotate(a,nBit);a+=b;}void CMd5::GG(ULONG &a,ULONG b,ULONG c,ULONG d,ULONG Msg,int nBit,ULONG Cnt){a+=G(b,c,d)+Msg+(ULONG)Cnt;a=LRotate(a,nBit);a+=b;}void CMd5::HH(ULONG &a,ULONG b,ULONG c,ULONG d,ULONG Msg,int nBit,ULONG Cnt){a+=H(b,c,d)+Msg+(ULONG)Cnt;a=LRotate(a,nBit);a+=b;}void CMd5::II(ULONG &a,ULONG b,ULONG c,ULONG d,ULONG Msg,int nBit,ULONG Cnt){a+=I(b,c,d)+Msg+(ULONG)Cnt;a=LRotate(a,nBit);a+=b;}//==========================<成员函数实现>======================================CMd5::CMd5(){IsSuc=false;Pointer=NULL;memset(strErr,0,50);}CMd5::CMd5(char *filename){IsSuc=false;Pointer=NULL;memset(strErr,0,50);TargetFile(filename);}CMd5::~CMd5(){if(Sfile.is_open()){Sfile.close();}if(Pointer){delete[] Pointer; Pointer=NULL;}}LPCSTR CMd5::TargetFile(char *filename){if(!Init()){SetErr(1);}static char temp[MAX_PATH];strcpy(temp,fname);strcpy(fname,filename);CaculateFile();return temp;}void CMd5::TargetStr(LPCSTR str){if(!Init()){SetErr(1);}CaculateStr(str);}bool CMd5::Init(){*fname='/0';IsSuc=true;*Digest='/0';try{Pointer=new BYTE[sizeof(ULONG)*16];}catch(bad_alloc w){ Pointer=NULL; SetErr(1);}pM=(ULONG*)Pointer;FileLen=0;for(int i=0;i<4;i++){ T[i]=Context[i];}return true;}bool CMd5::OpenFile(){Sfile.open(fname,ios::in|ios::binary);if( Sfile.fail() ){ SetErr(0);return false;}return true;}bool CMd5::Read64Byte(){static bool rb=true;int n;if(!Sfile.eof()){Sfile.read((char*)Pointer,sizeof(ULONG)*16);FileLen+=n=Sfile.gcount();if(n<64){char* p=(char*)Pointer+n;memset((void *)p,0,64-n);*p=(char)0x80;rb=false;if(n<56){LONG64 *pt=(LONG64*)Pointer+7;*pt=FileLen*8;return false;}}return true;}else{memset(Pointer,0,64);if(rb){*(char*)Pointer=(char)0x80;}LONG64 *pt=(LONG64 *)Pointer+7;*pt=FileLen*8;return false;}}void CMd5::TransForm(){MSG msg;while(PeekMessage(&msg,NULL,0,0,PM_REMOVE)){TranslateMessage(&msg);DispatchMessage(&msg);}ULONG a=T[0],b=T[1],c=T[2],d=T[3];//第一轮-------------------------------->FF (a, b, c, d, pM[ 0], S11, 0xd76aa478); //- 1 -FF (d, a, b, c, pM[ 1], S12, 0xe8c7b756); //- 2 -FF (c, d, a, b, pM[ 2], S13, 0x242070db); //- 3 -FF (b, c, d, a, pM[ 3], S14, 0xc1bdceee); //- 4 -FF (a, b, c, d, pM[ 4], S11, 0xf57c0faf); //- 5 -FF (d, a, b, c, pM[ 5], S12, 0x4787c62a); //- 6 -FF (c, d, a, b, pM[ 6], S13, 0xa8304613); //- 7 -FF (b, c, d, a, pM[ 7], S14, 0xfd469501); //- 8 -FF (a, b, c, d, pM[ 8], S11, 0x698098d8); //- 9 -FF (d, a, b, c, pM[ 9], S12, 0x8b44f7af); //- 10 -FF (c, d, a, b, pM[10], S13, 0xffff5bb1); //- 11 -FF (b, c, d, a, pM[11], S14, 0x895cd7be); //- 12 -FF (a, b, c, d, pM[12], S11, 0x6b901122); //- 13 -FF (d, a, b, c, pM[13], S12, 0xfd987193); //- 14 -FF (c, d, a, b, pM[14], S13, 0xa679438e); //- 15 -FF (b, c, d, a, pM[15], S14, 0x49b40821); //- 16 -//第二轮--------------------------------->GG (a, b, c, d, pM[ 1], S21, 0xf61e2562); //- 17 -GG (d, a, b, c, pM[ 6], S22, 0xc040b340); //- 18 -GG (c, d, a, b, pM[11], S23, 0x265e5a51); //- 19 -GG (b, c, d, a, pM[ 0], S24, 0xe9b6c7aa); //- 20 -GG (a, b, c, d, pM[ 5], S21, 0xd62f105d); //- 21 -GG (d, a, b, c, pM[10], S22, 0x2441453); //- 22 -GG (c, d, a, b, pM[15], S23, 0xd8a1e681); //- 23 -GG (b, c, d, a, pM[ 4], S24, 0xe7d3fbc8); //- 24 -GG (a, b, c, d, pM[ 9], S21, 0x21e1cde6); //- 25 -GG (d, a, b, c, pM[14], S22, 0xc33707d6); //- 26 -GG (c, d, a, b, pM[ 3], S23, 0xf4d50d87); //- 27 -GG (b, c, d, a, pM[ 8], S24, 0x455a14ed); //- 28 -GG (a, b, c, d, pM[13], S21, 0xa9e3e905); //- 29 -GG (d, a, b, c, pM[ 2], S22, 0xfcefa3f8); //- 30 -GG (c, d, a, b, pM[ 7], S23, 0x676f02d9); //- 31 -GG (b, c, d, a, pM[12], S24, 0x8d2a4c8a); //- 32 -//第三轮--------------------------------->HH (a, b, c, d, pM[ 5], S31, 0xfffa3942); //- 33 -HH (d, a, b, c, pM[ 8], S32, 0x8771f681); //- 34 -HH (c, d, a, b, pM[11], S33, 0x6d9d6122); //- 35 -HH (b, c, d, a, pM[14], S34, 0xfde5380c); //- 36 -HH (a, b, c, d, pM[ 1], S31, 0xa4beea44); //- 37 -HH (d, a, b, c, pM[ 4], S32, 0x4bdecfa9); //- 38 -HH (c, d, a, b, pM[ 7], S33, 0xf6bb4b60); //- 39 -HH (b, c, d, a, pM[10], S34, 0xbebfbc70); //- 40 -HH (a, b, c, d, pM[13], S31, 0x289b7ec6); //- 41 -HH (d, a, b, c, pM[ 0], S32, 0xeaa127fa); //- 42 -HH (c, d, a, b, pM[ 3], S33, 0xd4ef3085); //- 43 -HH (b, c, d, a, pM[ 6], S34, 0x4881d05); //- 44 -HH (a, b, c, d, pM[ 9], S31, 0xd9d4d039); //- 45 -HH (d, a, b, c, pM[12], S32, 0xe6db99e5); //- 46 -HH (c, d, a, b, pM[15], S33, 0x1fa27cf8); //- 47 -HH (b, c, d, a, pM[ 2], S34, 0xc4ac5665); //- 48 -//第四轮-------------------------------->II (a, b, c, d, pM[ 0], S41, 0xf4292244); //- 49 -II (d, a, b, c, pM[ 7], S42, 0x432aff97); //- 50 -II (c, d, a, b, pM[14], S43, 0xab9423a7); //- 51 -II (b, c, d, a, pM[ 5], S44, 0xfc93a039); //- 52 -II (a, b, c, d, pM[12], S41, 0x655b59c3); //- 53 -II (d, a, b, c, pM[ 3], S42, 0x8f0ccc92); //- 54 -II (c, d, a, b, pM[10], S43, 0xffeff47d); //- 55 -II (b, c, d, a, pM[ 1], S44, 0x85845dd1); //- 56 -II (a, b, c, d, pM[ 8], S41, 0x6fa87e4f); //- 57 -II (d, a, b, c, pM[15], S42, 0xfe2ce6e0); //- 58 -II (c, d, a, b, pM[ 6], S43, 0xa3014314); //- 59 -II (b, c, d, a, pM[13], S44, 0x4e0811a1); //- 60 -II (a, b, c, d, pM[ 4], S41, 0xf7537e82); //- 61 -II (d, a, b, c, pM[11], S42, 0xbd3af235); //- 62 -II (c, d, a, b, pM[ 2], S43, 0x2ad7d2bb); //- 63 -II (b, c, d, a, pM[ 9], S44, 0xeb86d391); //- 64 -T[0]+=a;T[1]+=b;T[2]+=c;T[3]+=d;return ;}LPCSTR CMd5::GetDigestKey(){ if(IsSuc){return Digest;}SetErr(4);return NULL;}bool CMd5::CaculateFile(){if(*fname==0){ SetErr(2);return false;}if(!OpenFile()){SetErr(0);return false;}bool bl;do{bl=Read64Byte(); TransForm();}while(bl);JustifytoStr();return true;}bool CMd5::CaculateStr(LPCSTR str){ULONG slen=strlen(str);ULONG n=slen/64,ntail=slen%64;for(int i=0;i<n;i++){ULONG *p=(ULONG *)str;TransForm();pM+=16;}memset(Pointer,0,64);memcpy(Pointer,str,ntail);UCHAR *pt=(UCHAR *)Pointer+ntail;*pt=0x80;LONG64 *pl=(LONG64 *)Pointer+7;*pl=(LONG64)(slen*8);TransForm();JustifytoStr();return true;}void CMd5::SetErr(int nErr){if(*strErr){return;}IsSuc=false;if(nErr==0){#ifndef ENGLISHsprintf(strErr,"打不开文件 [ %s ] !/n请确认文件是否存在 !",fname);#elsesprintf(strErr,"Can not open the file [ %s ] !",fname);#endif}else {#ifndef ENGLISHstrcpy(strErr,ErrInfo[nErr][1]); #else strcpy(strErr,ErrInfo[nErr][0]);#endif}}LPCSTR CMd5::GetErr(){if(!*strErr){#ifndef ENGLISHreturn "未发生错误 !";#else return "No error !";#endif}else{return strErr;}}void CMd5::JustifytoStr(){char temp[10];for(int i=0;i<4;i++){T[i]=(T[i]<<24)|((T[i]&0xff00)<<8)|((T[i]&0xff0000)>>8)|(T[i]>>24);sprintf(temp,"%08x",T[i]);strcat(Digest,temp);}}