MD5 计算类

#pragma once
//参考RFC1321标准
//参考资料见 http://www.ietf.org/rfc/rfc1321.txt

class 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 21

typedef 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;     //需要校验的总字节数
    ULONGLONG uLL_ProcessedSize; //已经校验的字节数
    double f_ProcPercent;        //进度百分比 %
    TCHAR  m_rawHash[2*16+1];    //校验结果
    BOOL bDone;                  //完成标志
  }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_FILE
static char THIS_FILE[] = __FILE__;
#endif

CMD5Sum::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 ,// 如果要映射文件：此处必设置为只读(GENERIC_READ)或读写
       0,    // 此设为打开文件的任何尝试均将失败
       NULL, 
       OPEN_EXISTING, 
       FILE_ATTRIBUTE_NORMAL, //|FILE_FLAG_WRITE_THROUGH,【解1】
       NULL);
    if (hFile != INVALID_HANDLE_VALUE)// 文件打开失败返回句柄为-1
    {
      HANDLE hFileMap = CreateFileMapping(
         hFile, // 如果这值为INVALID_HANDLE_VALUE,是合法的，上步一定测试啊
         NULL,   // 默认安全性
         PAGE_READONLY,   //只读
         0, // 2个32位数示1个64位数，最大文件字节数，
         0,//dwFileSize, // 此为低字节，也就是最主要的参数，如果为0，取文件真实大小
         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对齐
          if(partLen < dwLen) dwLen = (UINT4)partLen;

          LPVOID pvFile = MapViewOfFileEx( //pvFile就是得到的指针，用它来直接操作文件
             hFileMap, 
             FILE_MAP_READ ,    //读
             dwOffset.HighPart,     // 文件指针头位置 高字节
             dwOffset.LowPart, // 文件指针头位置 低字节 必为分配粒度的整倍数,windows的粒度为64K
             dwLen,   // 要映射的文件尾，如果为0，则从指针头到真实文件尾
             NULL);

          if (pvFile != NULL)
          {  
            MD5Update(&context, (unsigned char *)pvFile, dwLen);//calc

            UnmapViewOfFile(pvFile); // 释放内存映射文件的头指针
          }
          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);   // 内存映射文件句柄         
      }
      else
      {
        TRACE( _T("CreateFileMapping Error=%d\n"), GetLastError());
      }

      CloseHandle(hFile);    // 关闭文件
    }
    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;
}