CryptGenRandom windows下生成随机数的函数使用

// test_CryptGenRandom.cpp : 定义控制台应用程序的入口点。

//

#include "stdafx.h"

#include "windows.h"

#include "wincrypt.h"

#include <iostream>

using namespace std;

class CCryptRandom

{

public:

BOOL Random(void *lpBuffer,DWORD dwLen);

CCryptRandom();

virtual~CCryptRandom();

private:

HCRYPTPROV hCryptProv;

};

CCryptRandom::CCryptRandom()

{

hCryptProv=NULL;

CryptAcquireContext((HCRYPTPROV*)&hCryptProv,NULL,NULL,PROV_RSA_FULL,0);

}

CCryptRandom::~CCryptRandom()

{if(hCryptProv!=NULL)CryptReleaseContext(hCryptProv,0);

}

BOOL CCryptRandom::Random(void *lpBuffer, DWORD dwLen)

{

if(hCryptProv==NULL)return FALSE;

BOOL bRet=CryptGenRandom(hCryptProv,dwLen,(BYTE*)lpBuffer);///reinterpret_cast<LPBYTE>lpBuffer);

return bRet;

}

int _tmain(int argc, _TCHAR* argv[])

{

CCryptRandom crypt;

BYTE byte[MAX_PATH];

BOOL bReturnValue = crypt.Random(&byte, MAX_PATH);

for (DWORD i = 0; i < 8; ++i)

std::cout << std::dec << static_cast<unsigned int>(byte[i]) << std::endl;

return 0;

}