VC计算文件摘要

1、VC计算文件MD5摘要

//输入:文件路径
//输出:128位MD5摘要
#include <wincrypt.h>
CString szResult;

CString CMD5AndSHA1Dlg::CalcMD5(CString strFilePath)
{
  //读取文件
  CFile inFile;
  CFileException ex;
  DWORD dwLength=0;
  BYTE* pbContent=NULL;
  BOOL bRet;

  bRet=inFile.Open(strFilePath,CFile::modeRead | CFile::typeBinary | CFile::shareDenyWrite,&ex);
  if(bRet==FALSE)
  {
    return TEXT("Error opening file");;
  }

  dwLength = (DWORD)inFile.GetLength();
  pbContent = new BYTE[dwLength];
  if(pbContent==NULL)
  {
    return TEXT("Error not enough memory");;
  }
  inFile.Read(pbContent,dwLength);
  inFile.Close();

  //计算MD5编码
  HCRYPTPROV hCryptProv; 
  HCRYPTHASH hHash; 
  BYTE byteMD5[16]; 
  DWORD dwHashLen=16;
  CString szResult;

  if(CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)) 
  {
    if(CryptCreateHash(hCryptProv, CALG_MD5, 0, 0, &hHash)) 
    {
      if(CryptHashData(hHash, pbContent, dwLength, 0))
      {

        if(CryptGetHashParam(hHash, HP_HASHVAL, byteMD5, &dwHashLen, 0)) 
        {
          szResult.Format(TEXT("%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"),
            byteMD5[0],byteMD5[1],byteMD5[2],byteMD5[3],byteMD5[4],byteMD5[5],byteMD5[6],byteMD5[7]
            ,byteMD5[8],byteMD5[9],byteMD5[10],byteMD5[11],byteMD5[12],byteMD5[13],byteMD5[14],byteMD5[15]);
        }
        else
        {
          szResult=TEXT("Error getting hash param");
        }

      }
      else
      {
        szResult=TEXT("Error hashing data");
      }
    }
    else
    {
      szResult=TEXT("Error creating hash");
    }
  }
  else
  {
    szResult=TEXT("Error acquiring context");
  }

  CryptDestroyHash(hHash); 
  CryptReleaseContext(hCryptProv, 0); 
  delete[] pbContent;
  pbContent=NULL;

  return szResult;
}

2、VC计算文件SHA1摘要

//输入:文件路径(文件必须小于2^64bit)
//输出:160位SHA1摘要
#include <wincrypt.h>
CString szResult;

CString CMD5AndSHA1Dlg::CalcSHA1(CString strFilePath)
{
  //读取文件
  CFile inFile;
  CFileException ex;
  DWORD dwLength=0;
  BYTE* pbContent=NULL;
  BOOL bRet;

  bRet=inFile.Open(strFilePath,CFile::modeRead | CFile::typeBinary | CFile::shareDenyWrite,&ex);
  if(bRet==FALSE)
  {
    return TEXT("Error opening file");;
  }

  dwLength = (DWORD)inFile.GetLength();
  pbContent = new BYTE[dwLength];
  if(pbContent==NULL)
  {
    return TEXT("Error not enough memory");;
  }
  inFile.Read(pbContent,dwLength);
  inFile.Close();

  //计算MD5编码
  HCRYPTPROV hCryptProv; 
  HCRYPTHASH hHash; 
  BYTE byteSHA1[20]; 
  DWORD dwHashLen=20;
  CString szResult;

  if(CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)) 
  {
    if(CryptCreateHash(hCryptProv, CALG_SHA1, 0, 0, &hHash)) 
    {
      if(CryptHashData(hHash, pbContent, dwLength, 0))
      {

        if(CryptGetHashParam(hHash, HP_HASHVAL, byteSHA1, &dwHashLen, 0)) 
        {
          szResult.Format(TEXT("%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x"),
            byteSHA1[0],byteSHA1[1],byteSHA1[2],byteSHA1[3],byteSHA1[4],byteSHA1[5],byteSHA1[6],byteSHA1[7],
            byteSHA1[8],byteSHA1[9],byteSHA1[10],byteSHA1[11],byteSHA1[12],byteSHA1[13],byteSHA1[14],byteSHA1[15],
            byteSHA1[16],byteSHA1[17],byteSHA1[18],byteSHA1[19]);
        }
        else
        {
          szResult=TEXT("Error getting hash param");
        }

      }
      else
      {
        szResult=TEXT("Error hashing data");
      }
    }
    else
    {
      szResult=TEXT("Error creating hash");
    }
  }
  else
  {
    szResult=TEXT("Error acquiring context");
  }

  CryptDestroyHash(hHash); 
  CryptReleaseContext(hCryptProv, 0); 
  delete[] pbContent;
  pbContent=NULL;

  return szResult;
}

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