Check if SHA-2 support is available on Windows 7 SP1 (KB3033929)

win7-sha2-KB3033929.c

BOOL IsSHA2Supported()
{
	// Get a handle to the DLL module
	HMODULE hLib = LoadLibraryA("wintrust.dll");

	// If the handle is valid, try to get the function address
	if (hLib != NULL)
	{
		PVOID fpCryptCATAdminAcquireContext2 = GetProcAddress(hLib, "CryptCATAdminAcquireContext2");

		// Free the DLL module
		FreeLibrary(hLib);

		return fpCryptCATAdminAcquireContext2 != NULL;
	}

	return FALSE;
}