CryptProtectData/CryptUnprotectData加解密

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CryptProtectData/CryptUnprotectData加解密

2013年04月01日 ⁄ 综合 ⁄ 共 3040字 ⁄ 字号小中大 ⁄ 评论关闭

#include "stdafx.h"

#include <string>

#include <WTypes.h>

#include <stdio.h>

#include <windows.h>

#include <Wincrypt.h>

#include <sstream>

using namespace std;

const char* Hex2ASC( const BYTE* Hex, int Len)

{

static char ASC[4096 * 2];

int i;

for (i = 0; i < Len; i++)

{

ASC[i * 2] = "0123456789ABCDEF"[Hex[i] >> 4];

ASC[i * 2 + 1] = "0123456789ABCDEF"[Hex[i] & 0x0F];

}

ASC[i * 2] = '/0';

return ASC;

}

std::string Hex2ASC_( const BYTE* Hex, int Len)

{

std::string str;

char ASC[3] = {0};

ASC[2] = '/0';

int i;

for (i = 0; i < Len; i++)

{

ASC[0] = "0123456789ABCDEF"[Hex[i] >> 4];

ASC[1] = "0123456789ABCDEF"[Hex[i] & 0x0F];

str += ASC;

}

return str;

}

int HexStringToByte(LPCSTR lpHex, LPBYTE* ppByte)

{

std::string straHex = lpHex;

int nHexLen = straHex.size();

// assert(nHexLen%2 == 0);

LPBYTE lpByte = new byte[nHexLen/2];

int nCount = 0;

for (int i=0; i<nHexLen/2; i++)

{

std::stringstream ss;

DWORD bb;

ss << straHex.at(i*2);

ss << straHex.at(i*2+1);

ss << '/0';

ss >> std::hex >> bb;

lpByte[i] = bb;

nCount++;

}

*ppByte = lpByte;

return nCount;

}

std::string ProtectData(LPSTR lpszText)

{

DATA_BLOB DataIn;

DATA_BLOB DataOut;

// mstsc.exe中使用的是unicode,所以必须做宽字符转换

BYTE *pbDataInput =(BYTE *)lpszText;

DWORD cbDataInput = strlen(lpszText)*sizeof(char);

DataIn.pbData = pbDataInput;

DataIn.cbData = cbDataInput;

std::string strPrt;

if(CryptProtectData(

&DataIn,

L"psw", // A description string

// to be included with the

// encrypted data.

NULL, // Optional entropy not used.

NULL, // Reserved.

NULL, // Pass NULL for the

// prompt structure.

&DataOut))

{

printf("The encryption phase worked./n");

strPrt = Hex2ASC(DataOut.pbData, DataOut.cbData);

LocalFree(DataOut.pbData);

}

return strPrt;

}

std::string UnProtectData(LPCSTR lpstr)

{

DATA_BLOB DataOut;

DATA_BLOB DataUnp;

LPBYTE lpByte = NULL;

int nLen = HexStringToByte(lpstr, &lpByte);

DataUnp.cbData = nLen;

DataUnp.pbData = lpByte;

// mstsc.exe中使用的是unicode,所以必须做宽字符转换

LPWSTR lpwstr = NULL;

BOOL bRet = CryptUnprotectData(&DataUnp, &lpwstr, NULL, NULL, NULL, 0, &DataOut);

LPSTR lpStrOut = new char[DataOut.cbData+1];

memcpy(lpStrOut, DataOut.pbData, DataOut.cbData);

lpStrOut[DataOut.cbData] = 0;

LocalFree(DataOut.pbData);

if (lpwstr)

{

LocalFree((HLOCAL)lpwstr);

}

if (lpByte)

{

delete[] lpByte;

}

std::string strRet = lpStrOut;

delete[] lpStrOut;

return strRet;

}

void main()

{

std::string strPrt = ProtectData("freedom!!!");

std::string strUnPrt = UnProtectData(strPrt.c_str());

//#define CONSTSTR "01000000D08C9DDF0115D1118C7A00C04FC297EB01000000B373EAAE3C9F3746B428C797A5742CBF0000000008000000700073007700000003660000A800000010000000F762A0B543ABC4D2E3E1ECB3706875760000000004800000A0000000100000006B5B19F40B51D8FA9BFB88FE2555784D08000000757F1FBD89068ED814000000BEF2822C2A836556E9320BD065870D0242A051F6"

// std::string strUnPrt = UnProtectData(CONSTSTR);

// std::string strUnPrt1 = UnProtectData(CONSTSTR);

// std::string strUnPrt2 = UnProtectData(CONSTSTR);

// std::string strUnPrt3 = UnProtectData(CONSTSTR);

}