/** @file | |
Implements the GetCryptoServices() API that retuns a pointer to the EDK II | |
SMM Crypto Protocol. | |
Copyright (C) Microsoft Corporation. All rights reserved. | |
SPDX-License-Identifier: BSD-2-Clause-Patent | |
**/ | |
#include <PiSmm.h> | |
#include <Library/BaseLib.h> | |
#include <Library/DebugLib.h> | |
#include <Library/SmmServicesTableLib.h> | |
#include <Protocol/SmmCrypto.h> | |
EDKII_SMM_CRYPTO_PROTOCOL *mSmmCryptoProtocol = NULL; | |
/** | |
Internal worker function that returns the pointer to an EDK II Crypto | |
Protocol/PPI. The layout of the PPI, DXE Protocol, and SMM Protocol are | |
identical which allows the implementation of the BaseCryptLib functions that | |
call through a Protocol/PPI to be shared for the PEI, DXE, and SMM | |
implementations. | |
This SMM implementation returns the pointer to the EDK II SMM Crypto Protocol | |
that was found in the library constructor SmmCryptLibConstructor(). | |
**/ | |
VOID * | |
GetCryptoServices ( | |
VOID | |
) | |
{ | |
return (VOID *)mSmmCryptoProtocol; | |
} | |
/** | |
Constructor looks up the EDK II SMM Crypto Protocol and verifies that it is | |
not NULL and has a high enough version value to support all the BaseCryptLib | |
functions. | |
@param ImageHandle The firmware allocated handle for the EFI image. | |
@param SystemTable A pointer to the EFI System Table. | |
@retval EFI_SUCCESS The EDK II SMM Crypto Protocol was found. | |
@retval EFI_NOT_FOUND The EDK II SMM Crypto Protocol was not found. | |
**/ | |
EFI_STATUS | |
EFIAPI | |
SmmCryptLibConstructor ( | |
IN EFI_HANDLE ImageHandle, | |
IN EFI_SYSTEM_TABLE *SystemTable | |
) | |
{ | |
EFI_STATUS Status; | |
UINTN Version; | |
Status = gSmst->SmmLocateProtocol ( | |
&gEdkiiSmmCryptoProtocolGuid, | |
NULL, | |
(VOID **)&mSmmCryptoProtocol | |
); | |
if (EFI_ERROR (Status) || (mSmmCryptoProtocol == NULL)) { | |
DEBUG ((DEBUG_ERROR, "[SmmCryptLib] Failed to locate Crypto SMM Protocol. Status = %r\n", Status)); | |
ASSERT_EFI_ERROR (Status); | |
ASSERT (mSmmCryptoProtocol != NULL); | |
mSmmCryptoProtocol = NULL; | |
return EFI_NOT_FOUND; | |
} | |
Version = mSmmCryptoProtocol->GetVersion (); | |
if (Version < EDKII_CRYPTO_VERSION) { | |
DEBUG ((DEBUG_ERROR, "[SmmCryptLib] Crypto SMM Protocol unsupported version %d\n", Version)); | |
ASSERT (Version >= EDKII_CRYPTO_VERSION); | |
mSmmCryptoProtocol = NULL; | |
return EFI_NOT_FOUND; | |
} | |
return EFI_SUCCESS; | |
} |