wintun/downlevelshim/shim.c

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/* SPDX-License-Identifier: GPL-2.0
*
* Copyright (C) 2018-2021 WireGuard LLC. All Rights Reserved.
*/
#include <windows.h>
#include <wintrust.h>
typedef DWORD(DRIVER_FINAL_POLICY_FN)(CRYPT_PROVIDER_DATA *);
typedef DRIVER_FINAL_POLICY_FN *PDRIVER_FINAL_POLICY_FN;
DRIVER_FINAL_POLICY_FN DriverFinalPolicy;
DWORD
DriverFinalPolicy(CRYPT_PROVIDER_DATA *ProvData)
{
DWORD OriginalLastError = GetLastError();
HMODULE WintrustModule = GetModuleHandleA("WINTRUST.DLL");
if (!WintrustModule)
return ERROR_INVALID_LIBRARY;
PDRIVER_FINAL_POLICY_FN RealDriverFinalPolicy =
(PDRIVER_FINAL_POLICY_FN)GetProcAddress(WintrustModule, "DriverFinalPolicy");
if (!RealDriverFinalPolicy)
return ERROR_INVALID_FUNCTION;
DWORD Ret = RealDriverFinalPolicy(ProvData);
if (Ret == ERROR_APP_WRONG_OS)
{
Ret = ERROR_SUCCESS;
SetLastError(OriginalLastError);
}
return Ret;
}