[MS Crypt API][原]计算文件hashParam
#define SAIO_CSP "SAIO SignCSP"typedef enum Em_Algorithm_TYPE{ AlgorithmType_SHA1 = 1, AlgorithmType_SHA256 = 2}ALGORITHM_TYPE, *PALGORITHM_TYPE;BOOL GetFileHashParam(LPCSTR lpszCataFileName, PBYTE pbyHash, PDWORD pdwHashLen, ALGORITHM_TYPE emAlAlgorithmType){ BOOL bRet = FALSE; HCRYPTPROV hProv = 0; HCRYPTHASH hHash = 0; HCRYPTKEY hKey = 0; HANDLE hFile = NULL; DWORD dwFileSize = 0, len; BYTE byTempBuf[2049] = {0}; hFile = CreateFile(lpszCataFileName, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if (INVALID_HANDLE_VALUE == hFile) { return FALSE; } DWORD dwProvType = PROV_RSA_AES; ALG_ID hashAlgo = CALG_SHA_256; if (AlgorithmType_SHA1 == emAlAlgorithmType) { dwProvType = PROV_RSA_FULL; hashAlgo = CALG_SHA1; } if (!CryptAcquireContext(&hProv, SAIO_CSP, NULL, dwProvType, 0)) { if (GetLastError() == NTE_BAD_KEYSET) { if(!CryptAcquireContext(&hProv,SAIO_CSP,NULL, PROV_RSA_FULL, CRYPT_NEWKEYSET)) { goto HashExit; } } } // // Create a hash object. // DWORD dwError = 0; if ( !CryptCreateHash(hProv, hashAlgo ,0 ,0 ,&hHash)) { dwError = GetLastError(); goto HashExit; } dwFileSize = GetFileSize(hFile, NULL); while(dwFileSize != 0) { bRet = ReadFile(hFile, byTempBuf, 2048, &len, NULL); // // Check for end of file. // if (bRet && len==0) { break; } CryptHashData(hHash, byTempBuf, len, 0); dwFileSize -= len; } if (hFile != NULL) { CloseHandle(hFile); } len = 0; DWORD dwCount = sizeof(DWORD); if(!CryptGetHashParam(hHash, HP_HASHSIZE, (BYTE*)pdwHashLen, &dwCount, 0)) { *pdwHashLen = 0; } else { if (!CryptGetHashParam(hHash, HP_HASHVAL, pbyHash, pdwHashLen, 0)) { *pdwHashLen = 0; } } if (*pdwHashLen != 20 && *pdwHashLen != 32) { bRet = FALSE; }HashExit: if (hKey != NULL) { CryptDestroyKey(hKey); } if (hHash != NULL) { CryptDestroyHash(hHash); } if (hProv != NULL) { CryptReleaseContext(hProv, 0); } return bRet;}