获取字符串的MD5值

bool GetMD5(LPCTSTR lpsz,const int strLen,LPTSTR lpMD5,const int bufLen)
{
    memset(lpMD5,0,bufLen);

    int mbStrLen = WideCharToMultiByte(CP_UTF8,0,lpsz,strLen,NULL,0,NULL,NULL);
    CHAR* mbStr = new CHAR[mbStrLen+1];
    memset(mbStr,0,mbStrLen+1);
    WideCharToMultiByte(CP_UTF8,0,lpsz,strLen,mbStr,mbStrLen,NULL,NULL);

    bool bSucc = false;
    HCRYPTPROV hProv = 0;
    HCRYPTHASH hHash = 0;    
    do{
        if (!CryptAcquireContext(&hProv,
            NULL,
            NULL,
            PROV_RSA_FULL,
            CRYPT_VERIFYCONTEXT)){
                break;
        }

        if (!CryptCreateHash(hProv, CALG_MD5, 0, 0, &hHash)){
            break;
        }

        if (!CryptHashData(hHash, (BYTE*)mbStr, mbStrLen, 0)){
            break;
        }

        BYTE rgbHash[16];
        DWORD cbHash = 16;
        const CHAR rgbDigits[] = "0123456789abcdef";
        if (CryptGetHashParam(hHash, HP_HASHVAL, rgbHash, &cbHash, 0)){
            if(cbHash>bufLen){
                break;
            }
            for (DWORD i = 0,index = 0; i < cbHash; i++){
                lpMD5[index++]=rgbDigits[rgbHash[i] >> 4];
                lpMD5[index++]=rgbDigits[rgbHash[i] & 0xf];
            }
        }
        bSucc = true;
    }while(0);

    CryptDestroyHash(hHash);
    CryptReleaseContext(hProv, 0);

    return bSucc;    
}

注意这个是在Unicode环境下的代码，需要进行宽窄字符转换，如果是多字节字符环境则不需要字符装换。