MD5 計算類

#pragma once//參考RFC1321標準//參考資料見 http://www.ietf.org/rfc/rfc1321.txtclass CMD5Sum{private:#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 unsigned char *POINTER;typedef unsigned short int UINT2;typedef unsigned long int UINT4;typedef struct _MD5_CTX{  UINT4 state[4];  UINT4 count[2];  unsigned char buffer[64];} MD5_CTX;/* F, G, H and I are basic MD5 functions. */#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))#define H(x, y, z) ((x) ^ (y) ^ (z))#define I(x, y, z) ((y) ^ ((x) | (~z)))/* ROTATE_LEFT rotates x left n bits.  15-April-2003 Sony: use MSVC intrinsic to save some cycles */#ifdef _MSC_VER#pragma intrinsic(_rotl)#define ROTATE_LEFT(x, n) _rotl((x), (n))#else#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))#endif/* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.Rotation is separate from addition to prevent recomputation. */#define FF(a, b, c, d, x, s, ac) { \ (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \ (a) = ROTATE_LEFT ((a), (s)); \ (a) += (b); \  }#define GG(a, b, c, d, x, s, ac) { \ (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \ (a) = ROTATE_LEFT ((a), (s)); \ (a) += (b); \  }#define HH(a, b, c, d, x, s, ac) { \ (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \ (a) = ROTATE_LEFT ((a), (s)); \ (a) += (b); \  }#define II(a, b, c, d, x, s, ac) { \ (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \ (a) = ROTATE_LEFT ((a), (s)); \ (a) += (b); \  }private:  CString      m_sHash;  unsigned char  m_rawHash[16];  static unsigned char PADDING[64];private:  void MD5Init (MD5_CTX *);  void MD5Update (MD5_CTX *, const unsigned char *, UINT4);  void MD5Final (unsigned char [16], MD5_CTX *);  static void MD5Transform (UINT4 [4], const unsigned char [64]);  static void Encode (unsigned char *, const UINT4 *, unsigned int);  static void Decode (UINT4 *, const unsigned char *, unsigned int);  static void MD5_memcpy (POINTER, POINTER, unsigned int);  static void MD5_memset (POINTER, int, unsigned int);public:  typedef struct _PROC_INFO  {    ULONGLONG uLL_TotalSize;     //需要校正的總位元組數    ULONGLONG uLL_ProcessedSize; //已經校正的位元組數    double f_ProcPercent;        //進度百分比 %    TCHAR  m_rawHash[2*16+1];    //校正結果    BOOL bDone;                  //完成標誌  }PROC_INFO, *LPPROC_INFO;public:  CMD5Sum();  virtual CString Calculate(const CString& sSource);  virtual CString Calculate(const unsigned char* pachSource, ULONGLONG nLen);  virtual CString FileCalculate(LPCTSTR lpszFile, LPPROC_INFO pProcInfo=NULL);  CString GetHash() const;  const unsigned char* GetRawHash() const { return m_rawHash; }};

 

 

 

#include "stdafx.h"#include "MD5Sum.h"#ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE[] = __FILE__;#endifCMD5Sum::CMD5Sum(){  memset(m_rawHash, 0, sizeof(m_rawHash));}CString CMD5Sum::Calculate(const CString& sSource){  return Calculate((const unsigned char*)(LPCTSTR)sSource, sSource.GetLength()*sizeof(TCHAR));}CString CMD5Sum::Calculate(const unsigned char* pachSource, ULONGLONG nLen){  MD5_CTX context;  MD5Init(&context); //init  ULONGLONG dwOffset = 0;  while(dwOffset < nLen)  {    ULONGLONG partLen = nLen - dwOffset;    UINT4 dwLen = -1;    if(partLen < dwLen) dwLen = (UINT4)partLen;    MD5Update(&context, pachSource + dwOffset, dwLen);//calc    dwOffset += dwLen;  }  MD5Final(m_rawHash, &context);//final  m_sHash.Empty();  for (int i = 0; i < 16; i++)  {    CString sT;    sT.Format(_T("%02X"), m_rawHash[i]);    m_sHash += sT;  }  return m_sHash;}CString CMD5Sum::FileCalculate(LPCTSTR lpszFile, LPPROC_INFO pProcInfo/*=NULL*/){  MD5_CTX context;  MD5Init(&context); //init  if(pProcInfo)  {    memset(pProcInfo, 0, sizeof(PROC_INFO));  }  if(_tcslen( lpszFile ) > 0)  {    HANDLE hFile = CreateFile(       lpszFile,        GENERIC_READ ,// 如果要對應檔：此處必設定為唯讀(GENERIC_READ)或讀寫       0,    // 此設為開啟檔案的任何嘗試均將失敗       NULL,        OPEN_EXISTING,        FILE_ATTRIBUTE_NORMAL, //|FILE_FLAG_WRITE_THROUGH,【解1】       NULL);    if (hFile != INVALID_HANDLE_VALUE)// 檔案開啟失敗返回控制代碼為-1    {      HANDLE hFileMap = CreateFileMapping(         hFile, // 如果這值為INVALID_HANDLE_VALUE,是合法的，上步一定測試啊         NULL,   // 預設安全性         PAGE_READONLY,   //唯讀         0, // 2個32位元示1個64位元，最大檔案位元組數，         0,//dwFileSize, // 此為低位元組，也就是最主要的參數，如果為0，取檔案真實大小         NULL);      if (hFileMap != NULL)      {        LARGE_INTEGER dwFileSize = {0};        GetFileSizeEx(hFile, &dwFileSize);        if(pProcInfo)          pProcInfo->uLL_TotalSize = dwFileSize.QuadPart;        LARGE_INTEGER dwOffset = {0};        while(dwOffset.QuadPart < dwFileSize.QuadPart)        {          ULONGLONG partLen = dwFileSize.QuadPart - dwOffset.QuadPart;          UINT4 dwLen = (64 * 1024) * 1024; //64M 64K對齊          if(partLen < dwLen) dwLen = (UINT4)partLen;          LPVOID pvFile = MapViewOfFileEx( //pvFile就是得到的指標，用它來直接操作檔案             hFileMap,              FILE_MAP_READ ,    //讀             dwOffset.HighPart,     // 檔案指標頭位置 高位元組             dwOffset.LowPart, // 檔案指標頭位置 低位元組 必為分配粒度的整倍數,windows的粒度為64K             dwLen,   // 要映射的檔案尾，如果為0，則從指標頭到真實檔案尾             NULL);          if (pvFile != NULL)          {              MD5Update(&context, (unsigned char *)pvFile, dwLen);//calc            UnmapViewOfFile(pvFile); // 釋放記憶體對應檔的頭指標          }          else          {            TRACE( _T("MapViewOfFile Error=%d\n"), GetLastError());          }          dwOffset.QuadPart += dwLen;          if(pProcInfo)          {            pProcInfo->uLL_ProcessedSize = dwOffset.QuadPart;            pProcInfo->f_ProcPercent =               (double)pProcInfo->uLL_ProcessedSize/(double)pProcInfo->uLL_TotalSize * 100.0;          }        }         CloseHandle(hFileMap);   // 記憶體對應檔控制代碼               }      else      {        TRACE( _T("CreateFileMapping Error=%d\n"), GetLastError());      }      CloseHandle(hFile);    // 關閉檔案    }    else    {      TRACE( _T("CreateFile Error=%d\n"), GetLastError());    }  }    MD5Final(m_rawHash, &context);//final  m_sHash.Empty();  for (int i = 0; i < 16; i++)  {    CString sT;    sT.Format(_T("%02X"), m_rawHash[i]);    m_sHash += sT;  }  if(pProcInfo)  {    _tcscpy_s(pProcInfo->m_rawHash, m_sHash);    pProcInfo->bDone = TRUE;  }  return m_sHash;}CString CMD5Sum::GetHash() const{  return m_sHash;}unsigned char CMD5Sum::PADDING[64] = {  0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};/* MD5 initialization. Begins an MD5 operation, writing a new context. */void CMD5Sum::MD5Init (MD5_CTX *context){  context->count[0] = context->count[1] = 0;  /* Load magic initialization constants.*/  context->state[0] = 0x67452301;  context->state[1] = 0xefcdab89;  context->state[2] = 0x98badcfe;  context->state[3] = 0x10325476;}/* MD5 block update operation. Continues an MD5 message-digest  operation, processing another message block, and updating the  context. */void CMD5Sum::MD5Update (MD5_CTX *context, const unsigned char *input, UINT4 inputLen){  UINT4 i, index, partLen;  /* Compute number of bytes mod 64 */  index = ((context->count[0] >> 3) & 0x3F);  /* Update number of bits */  if ((context->count[0] += (UINT4)(inputLen << 3)) < (inputLen << 3))    context->count[1]++;  context->count[1] += (UINT4)(inputLen >> 29);  partLen = 64 - index;  /* Transform as many times as possible.*/  if (inputLen >= partLen)   {   MD5_memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);   MD5Transform (context->state, context->buffer);   for (i = partLen; i + 63 < inputLen; i += 64)     MD5Transform (context->state, &input[i]);   index = 0;  }  else    i = 0;  /* Buffer remaining input */  MD5_memcpy( (POINTER)&context->buffer[index], (POINTER)&input[i], inputLen-i );}/* MD5 finalization. Ends an MD5 message-digest operation, writing the  the message digest and zeroizing the context. */void CMD5Sum::MD5Final (unsigned char digest[16], MD5_CTX *context){  unsigned char bits[8];  unsigned int index, padLen;  /* Save number of bits */  Encode (bits, context->count, 8);  /* Pad out to 56 mod 64.*/  index = (unsigned int)((context->count[0] >> 3) & 0x3f);  padLen = (index < 56) ? (56 - index) : (120 - index);  MD5Update (context, PADDING, padLen);  /* Append length (before padding) */  MD5Update (context, bits, 8);  /* Store state in digest */  Encode (digest, context->state, 16);  /* Zeroize sensitive information.*/  MD5_memset ((POINTER)context, 0, sizeof (*context));}/* MD5 basic transformation. Transforms state based on block. */void CMD5Sum::MD5Transform (UINT4 state[4], const unsigned char block[64]){  UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];  Decode (x, block, 64);  /* Round 1 */  FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */  FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */  FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */  FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */  FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */  FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */  FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */  FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */  FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */  FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */  FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */  FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */  FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */  FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */  FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */  FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ /* Round 2 */  GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */  GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */  GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */  GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */  GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */  GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */  GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */  GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */  GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */  GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */  GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */  GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */  GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */  GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */  GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */  GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */  /* Round 3 */  HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */  HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */  HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */  HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */  HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */  HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */  HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */  HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */  HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */  HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */  HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */  HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */  HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */  HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */  HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */  HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */  /* Round 4 */  II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */  II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */  II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */  II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */  II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */  II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */  II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */  II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */  II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */  II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */  II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */  II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */  II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */  II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */  II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */  II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */  state[0] += a;  state[1] += b;  state[2] += c;  state[3] += d;  /* Zeroize sensitive information.*/  MD5_memset ((POINTER)x, 0, sizeof (x));}/* Encodes input (UINT4) into output (unsigned char). Assumes len is  a multiple of 4. */void CMD5Sum::Encode (unsigned char *output, const UINT4 *input, unsigned int len){  unsigned int i, j;  for (i = 0, j = 0; j < len; i++, j += 4)   {   output[j] = (unsigned char)(input[i] & 0xff);   output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);   output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);   output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);  }}/* Decodes input (unsigned char) into output (UINT4). Assumes len is  a multiple of 4. */void CMD5Sum::Decode (UINT4 *output, const unsigned char *input, unsigned int len){  unsigned int i, j;  for (i = 0, j = 0; j < len; i++, j += 4) output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |   (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);}/* Note: Replace "for loop" with standard memcpy if possible. */void CMD5Sum::MD5_memcpy (POINTER output, POINTER input, unsigned int len){  unsigned int i;  for (i = 0; i < len; i++) output[i] = input[i];}/* Note: Replace "for loop" with standard memset if possible. */void CMD5Sum::MD5_memset (POINTER output, int value, unsigned int len){  unsigned int i;  for (i = 0; i < len; i++) ((char *)output)[i] = (char)value;}