VC 使用CryptoAPI计算Hash值：MD5, SHA

#include "stdafx.h"

#define _WIN32_WINNT 0x0400

#include <tchar.h>

#include <wincrypt.h>

// 计算Hash，成功返回0，失败返回GetLastError()

// CONST BYTE *pbData, // 输入数据

// DWORD dwDataLen, // 输入数据字节长度

// ALG_ID algId // Hash 算法：CALG_MD5,CALG_SHA

// LPTSTR pszHash, // 输出16进制Hash字符串，MD5长度为32+1, SHA长度为40+1

//

DWORD GetHash(CONST BYTE *pbData, DWORD dwDataLen, ALG_ID algId, LPTSTR pszHash)

{

DWORD dwReturn = 0;

HCRYPTPROV hProv;

if (!CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))

return (dwReturn = GetLastError());

HCRYPTHASH hHash;

//Alg Id:CALG_MD5,CALG_SHA

if(!CryptCreateHash(hProv, algId, 0, 0, &hHash))

{

dwReturn = GetLastError();

CryptReleaseContext(hProv, 0);

return dwReturn;

}

if(!CryptHashData(hHash, pbData, dwDataLen, 0))

{

dwReturn = GetLastError();

CryptDestroyHash(hHash);

CryptReleaseContext(hProv, 0);

return dwReturn;

}

DWORD dwSize;

DWORD dwLen = sizeof(dwSize);

CryptGetHashParam(hHash, HP_HASHSIZE, (BYTE*)(&dwSize), &dwLen, 0);

BYTE* pHash = new BYTE[dwSize];

dwLen = dwSize;

CryptGetHashParam(hHash, HP_HASHVAL, pHash, &dwLen, 0);

lstrcpy(pszHash, _T(""));

TCHAR szTemp[3];

for (DWORD i = 0; i < dwLen; ++i)

{

//wsprintf(szTemp, _T("%X%X"), pHash[i] >> 4, pHash[i] & 0xf);

wsprintf(szTemp, "%02X", pHash[i]);

lstrcat(pszHash, szTemp);

}

delete [] pHash;

CryptDestroyHash(hHash);

CryptReleaseContext(hProv, 0);

return dwReturn;

}

//=======================================================

// Test

int HashTest()

{

TCHAR szStr[20] = {0};

TCHAR szHash[41] = {0};

strcpy(szStr,"测试MD5");

GetHash((BYTE*)szStr, strlen(szStr), CALG_MD5,szHash);

MessageBox(NULL, szHash, szStr, MB_OK);

strcpy(szStr,"测试SHA");

GetHash((BYTE*)szStr, strlen(szStr),CALG_SHA,szHash);

MessageBox(NULL, szHash, szStr, MB_OK);

return 0;

}