std::unique_ptr<wchar_t[]> CStringUtils::Decrypt(const wchar_t * text)
{
DWORD dwLen = 0;
if (CryptStringToBinaryW(text, (DWORD)wcslen(text), CRYPT_STRING_HEX, NULL, &dwLen, NULL, NULL) == FALSE)
return NULL;
std::unique_ptr<BYTE[]> strIn(new BYTE[dwLen + 1]);
if (CryptStringToBinaryW(text, (DWORD)wcslen(text), CRYPT_STRING_HEX, strIn.get(), &dwLen, NULL, NULL) == FALSE)
return NULL;
DATA_BLOB blobin;
blobin.cbData = dwLen;
blobin.pbData = strIn.get();
LPWSTR descr = nullptr;
DATA_BLOB blobout = { 0 };
if (CryptUnprotectData(&blobin, &descr, NULL, NULL, NULL, CRYPTPROTECT_UI_FORBIDDEN, &blobout) == FALSE)
return NULL;
SecureZeroMemory(blobin.pbData, blobin.cbData);
std::unique_ptr<wchar_t[]> result(new wchar_t[(blobout.cbData) / sizeof(wchar_t) + 1]);
wcsncpy_s(result.get(), (blobout.cbData) / sizeof(wchar_t) + 1, (const wchar_t*)blobout.pbData, blobout.cbData / sizeof(wchar_t));
SecureZeroMemory(blobout.pbData, blobout.cbData);
LocalFree(blobout.pbData);
LocalFree(descr);
return result;
}
HRESULT DeserializePropVariantFromString(PCWSTR pszIn, PROPVARIANT *ppropvar)
{
HRESULT hr = E_FAIL;
DWORD dwFormatUsed, dwSkip, cbBlob;
// compute and validate the required buffer size
if (CryptStringToBinaryW(pszIn, 0, CRYPT_STRING_BASE64, NULL, &cbBlob, &dwSkip, &dwFormatUsed) &&
dwSkip == 0 &&
dwFormatUsed == CRYPT_STRING_BASE64)
{
// allocate a buffer to hold the serialized binary blob
hr = E_OUTOFMEMORY;
BYTE *pbSerialized = (BYTE *)CoTaskMemAlloc(cbBlob);
if (pbSerialized)
{
// convert the string to a serialized binary blob
hr = E_FAIL;
if (CryptStringToBinaryW(pszIn, 0, CRYPT_STRING_BASE64, pbSerialized, &cbBlob, &dwSkip, &dwFormatUsed))
{
// deserialized the blob back into a PROPVARIANT value
hr = StgDeserializePropVariant((SERIALIZEDPROPERTYVALUE *)pbSerialized, cbBlob, ppropvar);
}
CoTaskMemFree(pbSerialized);
}
}
return hr;
}
int FromBase64Crypto( const BYTE* pSrc, int nLenSrc, wchar_t* pDst, int nLenDst )
{
DWORD nLenOut= nLenDst;
BOOL fRet= CryptStringToBinaryW((LPCWSTR)pSrc, nLenSrc,CRYPT_STRING_BASE64,(BYTE*)pDst, &nLenOut,NULL,NULL);
if (!fRet) nLenOut=0;
return( nLenOut );
}
