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//Null data (except for first BYTE) used to finalise the checksum calculation
static unsigned char 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
};
2、CountChecksum.h（md5校驗(yàn)和類的頭文件）
class CMD5Checksum 
{
public:
 //interface functions for the RSA MD5 calculation
 static CString GetMD5(BYTE* pBuf, UINT nLength);
 static CString GetMD5(CFile& File);
 static CString GetMD5(const CString& strFilePath);

protected:
 //constructor/destructor
 CMD5Checksum();
 virtual ~CMD5Checksum() {};

 //RSA MD5 implementation
 void Transform(BYTE Block[64]);
 void Update(BYTE* Input, ULONG nInputLen);
 CString Final();
 inline DWORD RotateLeft(DWORD x, int n);
 inline void FF( DWORD& A, DWORD B, DWORD C, DWORD D, DWORD X, DWORD S, DWORD T);
 inline void GG( DWORD& A, DWORD B, DWORD C, DWORD D, DWORD X, DWORD S, DWORD T);
 inline void HH( DWORD& A, DWORD B, DWORD C, DWORD D, DWORD X, DWORD S, DWORD T);
 inline void II( DWORD& A, DWORD B, DWORD C, DWORD D, DWORD X, DWORD S, DWORD T);

 //utility functions
 void DWordToByte(BYTE* Output, DWORD* Input, UINT nLength);
 void ByteToDWord(DWORD* Output, BYTE* Input, UINT nLength);

private:
 BYTE  m_lpszBuffer[64];  //input buffer
 ULONG m_nCount[2];   //number of bits, modulo 2^64 (lsb first)
 ULONG m_lMD5[4];   //MD5 checksum
};

#endif // !defined(AFX_MD5CHECKSUM_H__2BC7928E_4C15_11D3_B2EE_A4A60E20D2C3__INCLUDED_)
3、CountChecksum.cpp （md5校驗(yàn)和類的實(shí)現(xiàn)文件）
/*****************************************************************************************
FUNCTION:  CMD5Checksum::GetMD5
DETAILS:  static, public
DESCRIPTION: Gets the MD5 checksum for a specified file
RETURNS:  CString : the hexadecimal MD5 checksum for the specified file
ARGUMENTS:  CString& strFilePath : the full pathname of the specified file
NOTES:   Provides an interface to the CMD5Checksum class. ‘strFilePath‘ name should
    hold the full pathname of the file, eg C:\My Documents\Arcticle.txt.
    NB. If any problems occur with opening or reading this file, a CFileException
    will be thrown; callers of this function should be ready to catch this
    exception.
*****************************************************************************************/
CString CMD5Checksum::GetMD5(const CString& strFilePath)
{
 //open the file as a binary file in readonly mode, denying write access
 CFile File(strFilePath, CFile::shareDenyNone);
 //the file has been successfully opened, so now get and return its checksum
 return GetMD5(File);
}

/*****************************************************************************************
FUNCTION:  CMD5Checksum::GetMD5
DETAILS:  static, public
DESCRIPTION: Gets the MD5 checksum for a specified file
RETURNS:  CString : the hexadecimal MD5 checksum for the specified file
ARGUMENTS:  CFile& File : the specified file
NOTES:   Provides an interface to the CMD5Checksum class. ‘File‘ should be open in
    binary readonly mode before calling this function.
    NB. Callers of this function should be ready to catch any CFileException
    thrown by the CFile functions
*****************************************************************************************/
CString CMD5Checksum::GetMD5(CFile& File)
{
 try
 {
  CMD5Checksum MD5Checksum;  //checksum object 
  int nLength = 0;    //number of bytes read from the file
  const int nBufferSize = 1024; //checksum the file in blocks of 1024 bytes
  BYTE Buffer[nBufferSize];  //buffer for data read from the file

  //checksum the file in blocks of 1024 bytes
  while ((nLength = File.Read( Buffer, nBufferSize )) > 0 )
  {
   MD5Checksum.Update( Buffer, nLength );
  }

  //finalise the checksum and return it
  return MD5Checksum.Final();
 }

 //report any file exceptions in debug mode only
 catch (CFileException* e )
 {
  TRACE0("CMD5Checksum::GetMD5: CFileException caught"); 
  throw e;
 }
}

/*****************************************************************************************
FUNCTION:  CMD5Checksum::GetMD5
DETAILS:  static, public
DESCRIPTION: Gets the MD5 checksum for data in a BYTE array
RETURNS:  CString : the hexadecimal MD5 checksum for the specified data
ARGUMENTS:  BYTE* pBuf  : pointer to the BYTE array
    UINT nLength : number of BYTEs of data to be checksumed
NOTES:   Provides an interface to the CMD5Checksum class. Any data that can
    be cast to a BYTE array of known length can be checksummed by this
    function. Typically, CString and char arrays will be checksumed,
    although this function can be used to check the integrity of any BYTE array.
    A buffer of zero length can be checksummed; all buffers of zero length
    will return the same checksum.
*****************************************************************************************/
CString CMD5Checksum::GetMD5(BYTE* pBuf, UINT nLength)
{
 //entry invariants
 AfxIsValidAddress(pBuf,nLength,FALSE);

 //calculate and return the checksum
 CMD5Checksum MD5Checksum;
 MD5Checksum.Update( pBuf, nLength );
 return MD5Checksum.Final();
}

/*****************************************************************************************
FUNCTION:  CMD5Checksum::RotateLeft
DETAILS:  private
DESCRIPTION: Rotates the bits in a 32 bit DWORD left by a specified amount
RETURNS:  The rotated DWORD
ARGUMENTS:  DWORD x : the value to be rotated
    int n   : the number of bits to rotate by
*****************************************************************************************/
DWORD CMD5Checksum::RotateLeft(DWORD x, int n)
{
 //check that DWORD is 4 bytes long - true in Visual C++ 6 and 32 bit Windows
 ASSERT( sizeof(x) == 4 );

 //rotate and return x
 return (x << n) | (x >> (32-n));
}

/*****************************************************************************************
FUNCTION:  CMD5Checksum::FF
DETAILS:  protected
DESCRIPTION: Implementation of basic MD5 transformation algorithm
RETURNS:  none
ARGUMENTS:  DWORD &A, B, C, D : Current (partial) checksum
    DWORD X           : Input data
    DWORD S     : MD5_SXX Transformation constant
    DWORD T     : MD5_TXX Transformation constant
NOTES:   None
*****************************************************************************************/
void CMD5Checksum::FF( DWORD& A, DWORD B, DWORD C, DWORD D, DWORD X, DWORD S, DWORD T)
{
 DWORD F = (B & C) | (~B & D);
 A += F + X + T;
 A = RotateLeft(A, S);
 A += B;
}

/*****************************************************************************************
FUNCTION:  CMD5Checksum::GG
DETAILS:  protected
DESCRIPTION: Implementation of basic MD5 transformation algorithm
RETURNS:  none
ARGUMENTS:  DWORD &A, B, C, D : Current (partial) checksum
    DWORD X           : Input data
    DWORD S     : MD5_SXX Transformation constant
    DWORD T     : MD5_TXX Transformation constant
NOTES:   None
*****************************************************************************************/
void CMD5Checksum::GG( DWORD& A, DWORD B, DWORD C, DWORD D, DWORD X, DWORD S, DWORD T)
{
 DWORD G = (B & D) | (C & ~D);
 A += G + X + T;
 A = RotateLeft(A, S);
 A += B;
}

/*****************************************************************************************
FUNCTION:  CMD5Checksum::HH
DETAILS:  protected
DESCRIPTION: Implementation of basic MD5 transformation algorithm
RETURNS:  none
ARGUMENTS:  DWORD &A, B, C, D : Current (partial) checksum
    DWORD X           : Input data
    DWORD S     : MD5_SXX Transformation constant
    DWORD T     : MD5_TXX Transformation constant
NOTES:   None
*****************************************************************************************/
void CMD5Checksum::HH( DWORD& A, DWORD B, DWORD C, DWORD D, DWORD X, DWORD S, DWORD T)
{
 DWORD H = (B ^ C ^ D);
 A += H + X + T;
 A = RotateLeft(A, S);
 A += B;
}

/*****************************************************************************************
FUNCTION:  CMD5Checksum::II
DETAILS:  protected
DESCRIPTION: Implementation of basic MD5 transformation algorithm
RETURNS:  none
ARGUMENTS:  DWORD &A, B, C, D : Current (partial) checksum
    DWORD X           : Input data
    DWORD S     : MD5_SXX Transformation constant
    DWORD T     : MD5_TXX Transformation constant
NOTES:   None
*****************************************************************************************/
void CMD5Checksum::II( DWORD& A, DWORD B, DWORD C, DWORD D, DWORD X, DWORD S, DWORD T)
{
 DWORD I = (C ^ (B | ~D));
 A += I + X + T;
 A = RotateLeft(A, S);
 A += B;
}

/*****************************************************************************************
FUNCTION:  CMD5Checksum::ByteToDWord
DETAILS:  private
DESCRIPTION: Transfers the data in an 8 bit array to a 32 bit array
RETURNS:  void
ARGUMENTS:  DWORD* Output : the 32 bit (unsigned long) destination array
    BYTE* Input   : the 8 bit (unsigned char) source array
    UINT nLength  : the number of 8 bit data items in the source array
NOTES:   Four BYTES from the input array are transferred to each DWORD entry
    of the output array. The first BYTE is transferred to the bits (0-7)
    of the output DWORD, the second BYTE to bits 8-15 etc.
    The algorithm assumes that the input array is a multiple of 4 bytes long
    so that there is a perfect fit into the array of 32 bit words.
*****************************************************************************************/
void CMD5Checksum::ByteToDWord(DWORD* Output, BYTE* Input, UINT nLength)
{
 //entry invariants
 ASSERT( nLength % 4 == 0 );
 ASSERT( AfxIsValidAddress(Output, nLength/4, TRUE) );
 ASSERT( AfxIsValidAddress(Input, nLength, FALSE) );

 //initialisations
 UINT i=0; //index to Output array
 UINT j=0; //index to Input array

 //transfer the data by shifting and copying
 for ( ; j < nLength; i++, j += 4)
 {
  Output[i] = (ULONG)Input[j]   |
     (ULONG)Input[j+1] << 8 |
     (ULONG)Input[j+2] << 16 |
     (ULONG)Input[j+3] << 24;
 }
}

/*****************************************************************************************
FUNCTION:  CMD5Checksum::Transform
DETAILS:  protected
DESCRIPTION: MD5 basic transformation algorithm;  transforms ‘m_lMD5‘
RETURNS:  void
ARGUMENTS:  BYTE Block[64]
NOTES:   An MD5 checksum is calculated by four rounds of ‘Transformation‘.
    The MD5 checksum currently held in m_lMD5 is merged by the
    transformation process with data passed in ‘Block‘. 
*****************************************************************************************/
void CMD5Checksum::Transform(BYTE Block[64])
{
 //initialise local data with current checksum
 ULONG a = m_lMD5[0];
 ULONG b = m_lMD5[1];
 ULONG c = m_lMD5[2];
 ULONG d = m_lMD5[3];

 //copy BYTES from input ‘Block‘ to an array of ULONGS ‘X‘
 ULONG X[16];
 ByteToDWord( X, Block, 64 );

 //Perform Round 1 of the transformation
 FF (a, b, c, d, X[ 0], MD5_S11, MD5_T01);
 FF (d, a, b, c, X[ 1], MD5_S12, MD5_T02);
 FF (c, d, a, b, X[ 2], MD5_S13, MD5_T03);
 FF (b, c, d, a, X[ 3], MD5_S14, MD5_T04);
 FF (a, b, c, d, X[ 4], MD5_S11, MD5_T05);
 FF (d, a, b, c, X[ 5], MD5_S12, MD5_T06);
 FF (c, d, a, b, X[ 6], MD5_S13, MD5_T07);
 FF (b, c, d, a, X[ 7], MD5_S14, MD5_T08);
 FF (a, b, c, d, X[ 8], MD5_S11, MD5_T09);
 FF (d, a, b, c, X[ 9], MD5_S12, MD5_T10);
 FF (c, d, a, b, X[10], MD5_S13, MD5_T11);
 FF (b, c, d, a, X[11], MD5_S14, MD5_T12);
 FF (a, b, c, d, X[12], MD5_S11, MD5_T13);
 FF (d, a, b, c, X[13], MD5_S12, MD5_T14);
 FF (c, d, a, b, X[14], MD5_S13, MD5_T15);
 FF (b, c, d, a, X[15], MD5_S14, MD5_T16);

 //Perform Round 2 of the transformation
 GG (a, b, c, d, X[ 1], MD5_S21, MD5_T17);
 GG (d, a, b, c, X[ 6], MD5_S22, MD5_T18);
 GG (c, d, a, b, X[11], MD5_S23, MD5_T19);
 GG (b, c, d, a, X[ 0], MD5_S24, MD5_T20);
 GG (a, b, c, d, X[ 5], MD5_S21, MD5_T21);
 GG (d, a, b, c, X[10], MD5_S22, MD5_T22);
 GG (c, d, a, b, X[15], MD5_S23, MD5_T23);
 GG (b, c, d, a, X[ 4], MD5_S24, MD5_T24);
 GG (a, b, c, d, X[ 9], MD5_S21, MD5_T25);
 GG (d, a, b, c, X[14], MD5_S22, MD5_T26);
 GG (c, d, a, b, X[ 3], MD5_S23, MD5_T27);
 GG (b, c, d, a, X[ 8], MD5_S24, MD5_T28);
 GG (a, b, c, d, X[13], MD5_S21, MD5_T29);
 GG (d, a, b, c, X[ 2], MD5_S22, MD5_T30);
 GG (c, d, a, b, X[ 7], MD5_S23, MD5_T31);
 GG (b, c, d, a, X[12], MD5_S24, MD5_T32);

 //Perform Round 3 of the transformation
 HH (a, b, c, d, X[ 5], MD5_S31, MD5_T33);
 HH (d, a, b, c, X[ 8], MD5_S32, MD5_T34);
 HH (c, d, a, b, X[11], MD5_S33, MD5_T35);
 HH (b, c, d, a, X[14], MD5_S34, MD5_T36);
 HH (a, b, c, d, X[ 1], MD5_S31, MD5_T37);
 HH (d, a, b, c, X[ 4], MD5_S32, MD5_T38);
 HH (c, d, a, b, X[ 7], MD5_S33, MD5_T39);
 HH (b, c, d, a, X[10], MD5_S34, MD5_T40);
 HH (a, b, c, d, X[13], MD5_S31, MD5_T41);
 HH (d, a, b, c, X[ 0], MD5_S32, MD5_T42);
 HH (c, d, a, b, X[ 3], MD5_S33, MD5_T43);
 HH (b, c, d, a, X[ 6], MD5_S34, MD5_T44);
 HH (a, b, c, d, X[ 9], MD5_S31, MD5_T45);
 HH (d, a, b, c, X[12], MD5_S32, MD5_T46);
 HH (c, d, a, b, X[15], MD5_S33, MD5_T47);
 HH (b, c, d, a, X[ 2], MD5_S34, MD5_T48);

 //Perform Round 4 of the transformation
 II (a, b, c, d, X[ 0], MD5_S41, MD5_T49);
 II (d, a, b, c, X[ 7], MD5_S42, MD5_T50);
 II (c, d, a, b, X[14], MD5_S43, MD5_T51);
 II (b, c, d, a, X[ 5], MD5_S44, MD5_T52);
 II (a, b, c, d, X[12], MD5_S41, MD5_T53);
 II (d, a, b, c, X[ 3], MD5_S42, MD5_T54);
 II (c, d, a, b, X[10], MD5_S43, MD5_T55);
 II (b, c, d, a, X[ 1], MD5_S44, MD5_T56);
 II (a, b, c, d, X[ 8], MD5_S41, MD5_T57);
 II (d, a, b, c, X[15], MD5_S42, MD5_T58);
 II (c, d, a, b, X[ 6], MD5_S43, MD5_T59);
 II (b, c, d, a, X[13], MD5_S44, MD5_T60);
 II (a, b, c, d, X[ 4], MD5_S41, MD5_T61);
 II (d, a, b, c, X[11], MD5_S42, MD5_T62);
 II (c, d, a, b, X[ 2], MD5_S43, MD5_T63);
 II (b, c, d, a, X[ 9], MD5_S44, MD5_T64);

 //add the transformed values to the current checksum
 m_lMD5[0] += a;
 m_lMD5[1] += b;
 m_lMD5[2] += c;
 m_lMD5[3] += d;
}

/*****************************************************************************************
CONSTRUCTOR: CMD5Checksum
DESCRIPTION: Initialises member data
ARGUMENTS:  None
NOTES:   None
*****************************************************************************************/
CMD5Checksum::CMD5Checksum()
{
 // zero members
 memset( m_lpszBuffer, 0, 64 );
 m_nCount[0] = m_nCount[1] = 0;

 // Load magic state initialization constants
 m_lMD5[0] = MD5_INIT_STATE_0;
 m_lMD5[1] = MD5_INIT_STATE_1;
 m_lMD5[2] = MD5_INIT_STATE_2;
 m_lMD5[3] = MD5_INIT_STATE_3;
}

/*****************************************************************************************
FUNCTION:  CMD5Checksum::DWordToByte
DETAILS:  private
DESCRIPTION: Transfers the data in an 32 bit array to a 8 bit array
RETURNS:  void
ARGUMENTS:  BYTE* Output  : the 8 bit destination array
    DWORD* Input  : the 32 bit source array
    UINT nLength  : the number of 8 bit data items in the source array
NOTES:   One DWORD from the input array is transferred into four BYTES
    in the output array. The first (0-7) bits of the first DWORD are
    transferred to the first output BYTE, bits bits 8-15 are transferred from
    the second BYTE etc.
    
    The algorithm assumes that the output array is a multiple of 4 bytes long
    so that there is a perfect fit of 8 bit BYTES into the 32 bit DWORDs.
*****************************************************************************************/
void CMD5Checksum::DWordToByte(BYTE* Output, DWORD* Input, UINT nLength )
{
 //entry invariants
 ASSERT( nLength % 4 == 0 );
 ASSERT( AfxIsValidAddress(Output, nLength, TRUE) );
 ASSERT( AfxIsValidAddress(Input, nLength/4, FALSE) );

 //transfer the data by shifting and copying
 UINT i = 0;
 UINT j = 0;
 for ( ; j < nLength; i++, j += 4)
 {
  Output[j] =   (UCHAR)(Input[i] & 0xff);
  Output[j+1] = (UCHAR)((Input[i] >> 8) & 0xff);
  Output[j+2] = (UCHAR)((Input[i] >> 16) & 0xff);
  Output[j+3] = (UCHAR)((Input[i] >> 24) & 0xff);
 }
}

/*****************************************************************************************
FUNCTION:  CMD5Checksum::Final
DETAILS:  protected
DESCRIPTION: Implementation of main MD5 checksum algorithm; ends the checksum calculation.
RETURNS:  CString : the final hexadecimal MD5 checksum result
ARGUMENTS:  None
NOTES:   Performs the final MD5 checksum calculation (‘Update‘ does most of the work,
    this function just finishes the calculation.)
*****************************************************************************************/
CString CMD5Checksum::Final()
{
 //Save number of bits
 BYTE Bits[8];
 DWordToByte( Bits, m_nCount, 8 );

 //Pad out to 56 mod 64.
 UINT nIndex = (UINT)((m_nCount[0] >> 3) & 0x3f);
 UINT nPadLen = (nIndex < 56) ? (56 - nIndex) : (120 - nIndex);
 Update( PADDING, nPadLen );

 //Append length (before padding)
 Update( Bits, 8 );

 //Store final state in ‘lpszMD5‘
 const int nMD5Size = 16;
 unsigned char lpszMD5[ nMD5Size ];
 DWordToByte( lpszMD5, m_lMD5, nMD5Size );

 //Convert the hexadecimal checksum to a CString
 CString strMD5;
 for ( int i=0; i < nMD5Size; i++)
 {
  CString Str;
  if (lpszMD5[i] == 0) {
   Str = CString("00");
  }
  else if (lpszMD5[i] <= 15)  {
   Str.Format("0%x",lpszMD5[i]);
  }
  else {
   Str.Format("%x",lpszMD5[i]);
  }

  ASSERT( Str.GetLength() == 2 );
  strMD5 += Str;
 }
 ASSERT( strMD5.GetLength() == 32 );
 return strMD5;
}

/*****************************************************************************************
FUNCTION:  CMD5Checksum::Update
DETAILS:  protected
DESCRIPTION: Implementation of main MD5 checksum algorithm
RETURNS:  void
ARGUMENTS:  BYTE* Input    : input block
    UINT nInputLen : length of input block
NOTES:   Computes the partial MD5 checksum for ‘nInputLen‘ bytes of data in ‘Input‘
*****************************************************************************************/
void CMD5Checksum::Update( BYTE* Input, ULONG nInputLen )
{
 //Compute number of bytes mod 64
 UINT nIndex = (UINT)((m_nCount[0] >> 3) & 0x3F);

 //Update number of bits
 if ( ( m_nCount[0] += nInputLen << 3 )  <  ( nInputLen << 3) )
 {
  m_nCount[1]++;
 }
 m_nCount[1] += (nInputLen >> 29);

 //Transform as many times as possible.
 UINT i=0;  
 UINT nPartLen = 64 - nIndex;
 if (nInputLen >= nPartLen)  
 {
  memcpy( &m_lpszBuffer[nIndex], Input, nPartLen );
  Transform( m_lpszBuffer );
  for (i = nPartLen; i + 63 < nInputLen; i += 64)
  {
   Transform( &Input[i] );
  }
  nIndex = 0;
 }
 else
 {
  i = 0;
 }

 // Buffer remaining input
 memcpy( &m_lpszBuffer[nIndex], &Input[i], nInputLen-i);
}