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/** @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;
}
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