Re: [PATCH v5 01/10] SecurityPkg: Create library for setting Secure Boot variables.

["Yao, Jiewen" <jiewen.yao@intel.com>]

Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>

> -----Original Message-----
> From: Grzegorz Bernacki <gjb@semihalf.com>
> Sent: Thursday, July 1, 2021 5:18 PM
> To: devel@edk2.groups.io
> Cc: leif@nuviainc.com; ardb+tianocore@kernel.org; Samer.El-Haj-
> Mahmoud@arm.com; sunny.Wang@arm.com; mw@semihalf.com;
> upstream@semihalf.com; Yao, Jiewen <jiewen.yao@intel.com>; Wang, Jian J
> <jian.j.wang@intel.com>; Xu, Min M <min.m.xu@intel.com>;
> lersek@redhat.com; sami.mujawar@arm.com; afish@apple.com; Ni, Ray
> <ray.ni@intel.com>; Justen, Jordan L <jordan.l.justen@intel.com>;
> rebecca@bsdio.com; grehan@freebsd.org; thomas.abraham@arm.com; Chiu,
> Chasel <chasel.chiu@intel.com>; Desimone, Nathaniel L
> <nathaniel.l.desimone@intel.com>; gaoliming@byosoft.com.cn; Dong, Eric
> <eric.dong@intel.com>; Kinney, Michael D <michael.d.kinney@intel.com>; Sun,
> Zailiang <zailiang.sun@intel.com>; Qian, Yi <yi.qian@intel.com>;
> graeme@nuviainc.com; rad@semihalf.com; pete@akeo.ie; Grzegorz Bernacki
> <gjb@semihalf.com>
> Subject: [PATCH v5 01/10] SecurityPkg: Create library for setting Secure Boot
> variables.
> 
> This commits add library, which consist functions related
> creation/removal Secure Boot variables. Some of the functions
> was moved from SecureBootConfigImpl.c file.
> 
> Signed-off-by: Grzegorz Bernacki <gjb@semihalf.com>
> ---
>  SecurityPkg/SecurityPkg.dsc                                         |   1 +
>  SecurityPkg/Library/SecureBootVariableLib/SecureBootVariableLib.inf |  79 ++
>  SecurityPkg/Include/Library/SecureBootVariableLib.h                 | 251 +++++
>  SecurityPkg/Library/SecureBootVariableLib/SecureBootVariableLib.c   | 980
> ++++++++++++++++++++
>  SecurityPkg/Library/SecureBootVariableLib/SecureBootVariableLib.uni |  16 +
>  5 files changed, 1327 insertions(+)
>  create mode 100644
> SecurityPkg/Library/SecureBootVariableLib/SecureBootVariableLib.inf
>  create mode 100644 SecurityPkg/Include/Library/SecureBootVariableLib.h
>  create mode 100644
> SecurityPkg/Library/SecureBootVariableLib/SecureBootVariableLib.c
>  create mode 100644
> SecurityPkg/Library/SecureBootVariableLib/SecureBootVariableLib.uni
> 
> diff --git a/SecurityPkg/SecurityPkg.dsc b/SecurityPkg/SecurityPkg.dsc
> index bd4b810bce..854f250625 100644
> --- a/SecurityPkg/SecurityPkg.dsc
> +++ b/SecurityPkg/SecurityPkg.dsc
> @@ -70,6 +70,7 @@
>    RpmcLib|SecurityPkg/Library/RpmcLibNull/RpmcLibNull.inf
> 
> TcgEventLogRecordLib|SecurityPkg/Library/TcgEventLogRecordLib/TcgEventLo
> gRecordLib.inf
> 
> MmUnblockMemoryLib|MdePkg/Library/MmUnblockMemoryLib/MmUnblockM
> emoryLibNull.inf
> +
> SecureBootVariableLib|SecurityPkg/Library/SecureBootVariableLib/SecureBoot
> VariableLib.inf
> 
>  [LibraryClasses.ARM]
>    #
> diff --git
> a/SecurityPkg/Library/SecureBootVariableLib/SecureBootVariableLib.inf
> b/SecurityPkg/Library/SecureBootVariableLib/SecureBootVariableLib.inf
> new file mode 100644
> index 0000000000..84367841d5
> --- /dev/null
> +++ b/SecurityPkg/Library/SecureBootVariableLib/SecureBootVariableLib.inf
> @@ -0,0 +1,79 @@
> +## @file
> +#  Provides initialization of Secure Boot keys and databases.
> +#
> +#  Copyright (c) 2021, ARM Ltd. All rights reserved.<BR>
> +#  Copyright (c) 2021, Semihalf All rights reserved.<BR>
> +#
> +#  SPDX-License-Identifier: BSD-2-Clause-Patent
> +#
> +##
> +
> +[Defines]
> +  INF_VERSION                    = 0x00010005
> +  BASE_NAME                      = SecureBootVariableLib
> +  MODULE_UNI_FILE                = SecureBootVariableLib.uni
> +  FILE_GUID                      = D4FFF5CA-6D8E-4DBD-8A4B-7C7CEBD97F6F
> +  MODULE_TYPE                    = DXE_DRIVER
> +  VERSION_STRING                 = 1.0
> +  LIBRARY_CLASS                  = SecureBootVariableLib|DXE_DRIVER
> DXE_RUNTIME_DRIVER UEFI_APPLICATION
> +
> +#
> +# The following information is for reference only and not required by the build
> tools.
> +#
> +#  VALID_ARCHITECTURES           = IA32 X64 AARCH64
> +#
> +
> +[Sources]
> +  SecureBootVariableLib.c
> +
> +[Packages]
> +  MdePkg/MdePkg.dec
> +  MdeModulePkg/MdeModulePkg.dec
> +  SecurityPkg/SecurityPkg.dec
> +  CryptoPkg/CryptoPkg.dec
> +
> +[LibraryClasses]
> +  BaseLib
> +  BaseMemoryLib
> +  DebugLib
> +  MemoryAllocationLib
> +  BaseCryptLib
> +  DxeServicesLib
> +
> +[Guids]
> +  ## CONSUMES            ## Variable:L"SetupMode"
> +  ## PRODUCES            ## Variable:L"SetupMode"
> +  ## CONSUMES            ## Variable:L"SecureBoot"
> +  ## PRODUCES            ## Variable:L"SecureBoot"
> +  ## PRODUCES            ## Variable:L"PK"
> +  ## PRODUCES            ## Variable:L"KEK"
> +  ## CONSUMES            ## Variable:L"PKDefault"
> +  ## CONSUMES            ## Variable:L"KEKDefault"
> +  ## CONSUMES            ## Variable:L"dbDefault"
> +  ## CONSUMES            ## Variable:L"dbxDefault"
> +  ## CONSUMES            ## Variable:L"dbtDefault"
> +  gEfiGlobalVariableGuid
> +
> +  ## SOMETIMES_CONSUMES  ## Variable:L"DB"
> +  ## SOMETIMES_CONSUMES  ## Variable:L"DBX"
> +  ## SOMETIMES_CONSUMES  ## Variable:L"DBT"
> +  gEfiImageSecurityDatabaseGuid
> +
> +  ## CONSUMES            ## Variable:L"SecureBootEnable"
> +  ## PRODUCES            ## Variable:L"SecureBootEnable"
> +  gEfiSecureBootEnableDisableGuid
> +
> +  ## CONSUMES            ## Variable:L"CustomMode"
> +  ## PRODUCES            ## Variable:L"CustomMode"
> +  gEfiCustomModeEnableGuid
> +
> +  gEfiCertTypeRsa2048Sha256Guid  ## CONSUMES
> +  gEfiCertX509Guid               ## CONSUMES
> +  gEfiCertPkcs7Guid              ## CONSUMES
> +
> +  gDefaultPKFileGuid
> +  gDefaultKEKFileGuid
> +  gDefaultdbFileGuid
> +  gDefaultdbxFileGuid
> +  gDefaultdbtFileGuid
> +
> diff --git a/SecurityPkg/Include/Library/SecureBootVariableLib.h
> b/SecurityPkg/Include/Library/SecureBootVariableLib.h
> new file mode 100644
> index 0000000000..e010667165
> --- /dev/null
> +++ b/SecurityPkg/Include/Library/SecureBootVariableLib.h
> @@ -0,0 +1,251 @@
> +/** @file
> +  Provides a function to enroll keys based on default values.
> +
> +Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved.<BR>
> +(C) Copyright 2018 Hewlett Packard Enterprise Development LP<BR>
> +Copyright (c) 2021, ARM Ltd. All rights reserved.<BR>
> +Copyright (c) 2021, Semihalf All rights reserved.<BR>
> +SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +
> +#ifndef __SECURE_BOOT_VARIABLE_LIB_H__
> +#define __SECURE_BOOT_VARIABLE_LIB_H__
> +
> +/**
> +  Set the platform secure boot mode into "Custom" or "Standard" mode.
> +
> +  @param[in]   SecureBootMode        New secure boot mode:
> STANDARD_SECURE_BOOT_MODE or
> +                                     CUSTOM_SECURE_BOOT_MODE.
> +
> +  @return EFI_SUCCESS                The platform has switched to the special mode
> successfully.
> +  @return other                      Fail to operate the secure boot mode.
> +
> +--*/
> +EFI_STATUS
> +SetSecureBootMode (
> +  IN  UINT8  SecureBootMode
> +);
> +
> +/**
> +  Fetches the value of SetupMode variable.
> +
> +  @param[out] SetupMode             Pointer to UINT8 for SetupMode output
> +
> +  @retval other                     Error codes from GetVariable.
> +--*/
> +EFI_STATUS
> +EFIAPI
> +GetSetupMode (
> +  OUT UINT8 *SetupMode
> +);
> +
> +/**
> +  Create a time based data payload by concatenating the
> EFI_VARIABLE_AUTHENTICATION_2
> +  descriptor with the input data. NO authentication is required in this function.
> +
> +  @param[in, out]   DataSize       On input, the size of Data buffer in bytes.
> +                                   On output, the size of data returned in Data
> +                                   buffer in bytes.
> +  @param[in, out]   Data           On input, Pointer to data buffer to be wrapped
> or
> +                                   pointer to NULL to wrap an empty payload.
> +                                   On output, Pointer to the new payload date buffer allocated
> from pool,
> +                                   it's caller's responsibility to free the memory when finish
> using it.
> +
> +  @retval EFI_SUCCESS              Create time based payload successfully.
> +  @retval EFI_OUT_OF_RESOURCES     There are not enough memory resources
> to create time based payload.
> +  @retval EFI_INVALID_PARAMETER    The parameter is invalid.
> +  @retval Others                   Unexpected error happens.
> +
> +--*/
> +EFI_STATUS
> +CreateTimeBasedPayload (
> +  IN OUT UINTN            *DataSize,
> +  IN OUT UINT8            **Data
> +);
> +
> +/**
> +  Sets the content of the 'db' variable based on 'dbDefault' variable content.
> +
> +  @retval EFI_OUT_OF_RESOURCES      If memory allocation for
> EFI_VARIABLE_AUTHENTICATION_2 fails
> +                                    while VendorGuid is NULL.
> +  @retval other                     Errors from GetVariable2(), GetTime() and
> SetVariable()
> +--*/
> +EFI_STATUS
> +EFIAPI
> +EnrollDbFromDefault (
> +  VOID
> +);
> +
> +/**
> +  Clears the content of the 'db' variable.
> +
> +  @retval EFI_OUT_OF_RESOURCES      If memory allocation for
> EFI_VARIABLE_AUTHENTICATION_2 fails
> +                                    while VendorGuid is NULL.
> +  @retval other                     Errors from GetVariable2(), GetTime() and
> SetVariable()
> +--*/
> +EFI_STATUS
> +EFIAPI
> +DeleteDb (
> +  VOID
> +);
> +
> +/**
> +  Sets the content of the 'dbx' variable based on 'dbxDefault' variable content.
> +
> +  @retval EFI_OUT_OF_RESOURCES      If memory allocation for
> EFI_VARIABLE_AUTHENTICATION_2 fails
> +                                    while VendorGuid is NULL.
> +  @retval other                     Errors from GetVariable2(), GetTime() and
> SetVariable()
> +--*/
> +EFI_STATUS
> +EFIAPI
> +EnrollDbxFromDefault (
> +  VOID
> +);
> +
> +/**
> +  Clears the content of the 'dbx' variable.
> +
> +  @retval EFI_OUT_OF_RESOURCES      If memory allocation for
> EFI_VARIABLE_AUTHENTICATION_2 fails
> +                                    while VendorGuid is NULL.
> +  @retval other                     Errors from GetVariable2(), GetTime() and
> SetVariable()
> +--*/
> +EFI_STATUS
> +EFIAPI
> +DeleteDbx (
> +  VOID
> +);
> +
> +/**
> +  Sets the content of the 'dbt' variable based on 'dbtDefault' variable content.
> +
> +  @retval EFI_OUT_OF_RESOURCES      If memory allocation for
> EFI_VARIABLE_AUTHENTICATION_2 fails
> +                                    while VendorGuid is NULL.
> +  @retval other                     Errors from GetVariable2(), GetTime() and
> SetVariable()
> +--*/
> +EFI_STATUS
> +EFIAPI
> +EnrollDbtFromDefault (
> +  VOID
> +);
> +
> +/**
> +  Clears the content of the 'dbt' variable.
> +
> +  @retval EFI_OUT_OF_RESOURCES      If memory allocation for
> EFI_VARIABLE_AUTHENTICATION_2 fails
> +                                    while VendorGuid is NULL.
> +  @retval other                     Errors from GetVariable2(), GetTime() and
> SetVariable()
> +--*/
> +EFI_STATUS
> +EFIAPI
> +DeleteDbt (
> +  VOID
> +);
> +
> +/**
> +  Sets the content of the 'KEK' variable based on 'KEKDefault' variable content.
> +
> +  @retval EFI_OUT_OF_RESOURCES      If memory allocation for
> EFI_VARIABLE_AUTHENTICATION_2 fails
> +                                    while VendorGuid is NULL.
> +  @retval other                     Errors from GetVariable2(), GetTime() and
> SetVariable()
> +--*/
> +EFI_STATUS
> +EFIAPI
> +EnrollKEKFromDefault (
> +  VOID
> +);
> +
> +/**
> +  Clears the content of the 'KEK' variable.
> +
> +  @retval EFI_OUT_OF_RESOURCES      If memory allocation for
> EFI_VARIABLE_AUTHENTICATION_2 fails
> +                                    while VendorGuid is NULL.
> +  @retval other                     Errors from GetVariable2(), GetTime() and
> SetVariable()
> +--*/
> +EFI_STATUS
> +EFIAPI
> +DeleteKEK (
> +  VOID
> +);
> +
> +/**
> +  Sets the content of the 'PK' variable based on 'PKDefault' variable content.
> +
> +  @retval EFI_OUT_OF_RESOURCES      If memory allocation for
> EFI_VARIABLE_AUTHENTICATION_2 fails
> +                                    while VendorGuid is NULL.
> +  @retval other                     Errors from GetVariable2(), GetTime() and
> SetVariable()
> +--*/
> +EFI_STATUS
> +EFIAPI
> +EnrollPKFromDefault (
> +  VOID
> +);
> +
> +/**
> +  Clears the content of the 'PK' variable.
> +
> +  @retval EFI_OUT_OF_RESOURCES      If memory allocation for
> EFI_VARIABLE_AUTHENTICATION_2 fails
> +                                    while VendorGuid is NULL.
> +  @retval other                     Errors from GetVariable2(), GetTime() and
> SetVariable()
> +--*/
> +EFI_STATUS
> +EFIAPI
> +DeletePlatformKey (
> +  VOID
> +);
> +
> +/**
> +  Initializes PKDefault variable with data from FFS section.
> +
> +  @retval  EFI_SUCCESS           Variable was initialized successfully.
> +  @retval  EFI_UNSUPPORTED       Variable already exists.
> +--*/
> +EFI_STATUS
> +SecureBootInitPKDefault (
> +  IN VOID
> +  );
> +
> +/**
> +  Initializes KEKDefault variable with data from FFS section.
> +
> +  @retval  EFI_SUCCESS           Variable was initialized successfully.
> +  @retval  EFI_UNSUPPORTED       Variable already exists.
> +--*/
> +EFI_STATUS
> +SecureBootInitKEKDefault (
> +  IN VOID
> +  );
> +
> +/**
> +  Initializes dbDefault variable with data from FFS section.
> +
> +  @retval  EFI_SUCCESS           Variable was initialized successfully.
> +  @retval  EFI_UNSUPPORTED       Variable already exists.
> +--*/
> +EFI_STATUS
> +SecureBootInitdbDefault (
> +  IN VOID
> +  );
> +
> +/**
> +  Initializes dbtDefault variable with data from FFS section.
> +
> +  @retval  EFI_SUCCESS           Variable was initialized successfully.
> +  @retval  EFI_UNSUPPORTED       Variable already exists.
> +--*/
> +EFI_STATUS
> +SecureBootInitdbtDefault (
> +  IN VOID
> +  );
> +
> +/**
> +  Initializes dbxDefault variable with data from FFS section.
> +
> +  @retval  EFI_SUCCESS           Variable was initialized successfully.
> +  @retval  EFI_UNSUPPORTED       Variable already exists.
> +--*/
> +EFI_STATUS
> +SecureBootInitdbxDefault (
> +  IN VOID
> +  );
> +#endif
> diff --git a/SecurityPkg/Library/SecureBootVariableLib/SecureBootVariableLib.c
> b/SecurityPkg/Library/SecureBootVariableLib/SecureBootVariableLib.c
> new file mode 100644
> index 0000000000..f3dafeca6e
> --- /dev/null
> +++ b/SecurityPkg/Library/SecureBootVariableLib/SecureBootVariableLib.c
> @@ -0,0 +1,980 @@
> +/** @file
> +  This library provides functions to set/clear Secure Boot
> +  keys and databases.
> +
> +Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved.<BR>
> +(C) Copyright 2018 Hewlett Packard Enterprise Development LP<BR>
> +Copyright (c) 2021, ARM Ltd. All rights reserved.<BR>
> +Copyright (c) 2021, Semihalf All rights reserved.<BR>
> +SPDX-License-Identifier: BSD-2-Clause-Patent
> +
> +**/
> +#include <Guid/GlobalVariable.h>
> +#include <Guid/AuthenticatedVariableFormat.h>
> +#include <Guid/ImageAuthentication.h>
> +#include <Library/BaseCryptLib.h>
> +#include <Library/BaseLib.h>
> +#include <Library/BaseMemoryLib.h>
> +#include <Library/DebugLib.h>
> +#include <Library/UefiLib.h>
> +#include <Library/MemoryAllocationLib.h>
> +#include <Library/UefiRuntimeServicesTableLib.h>
> +#include <Library/SecureBootVariableLib.h>
> +#include "Library/DxeServicesLib.h"
> +
> +/** Creates EFI Signature List structure.
> +
> +  @param[in]      Data     A pointer to signature data.
> +  @param[in]      Size     Size of signature data.
> +  @param[out]     SigList  Created Signature List.
> +
> +  @retval  EFI_SUCCESS           Signature List was created successfully.
> +  @retval  EFI_OUT_OF_RESOURCES  Failed to allocate memory.
> +--*/
> +STATIC
> +EFI_STATUS
> +CreateSigList (
> +  IN VOID                *Data,
> +  IN UINTN               Size,
> +  OUT EFI_SIGNATURE_LIST **SigList
> +  )
> +{
> +  UINTN                  SigListSize;
> +  EFI_SIGNATURE_LIST     *TmpSigList;
> +  EFI_SIGNATURE_DATA     *SigData;
> +
> +  //
> +  // Allocate data for Signature Database
> +  //
> +  SigListSize = sizeof (EFI_SIGNATURE_LIST) + sizeof (EFI_SIGNATURE_DATA) - 1
> + Size;
> +  TmpSigList = (EFI_SIGNATURE_LIST *) AllocateZeroPool (SigListSize);
> +  if (TmpSigList == NULL) {
> +    return EFI_OUT_OF_RESOURCES;
> +  }
> +
> +  //
> +  // Only gEfiCertX509Guid type is supported
> +  //
> +  TmpSigList->SignatureListSize = (UINT32)SigListSize;
> +  TmpSigList->SignatureSize = (UINT32) (sizeof (EFI_SIGNATURE_DATA) - 1 +
> Size);
> +  TmpSigList->SignatureHeaderSize = 0;
> +  CopyGuid (&TmpSigList->SignatureType, &gEfiCertX509Guid);
> +
> +  //
> +  // Copy key data
> +  //
> +  SigData = (EFI_SIGNATURE_DATA *) (TmpSigList + 1);
> +  CopyGuid (&SigData->SignatureOwner, &gEfiGlobalVariableGuid);
> +  CopyMem (&SigData->SignatureData[0], Data, Size);
> +
> +  *SigList = TmpSigList;
> +
> +  return EFI_SUCCESS;
> +}
> +
> +/** Adds new signature list to signature database.
> +
> +  @param[in]      SigLists        A pointer to signature database.
> +  @param[in]      SiglListAppend  A signature list to be added.
> +  @param[out]     *SigListOut     Created signature database.
> +  @param[out]     SigListsSize    A size of created signature database.
> +
> +  @retval  EFI_SUCCESS           Signature List was added successfully.
> +  @retval  EFI_OUT_OF_RESOURCES  Failed to allocate memory.
> +--*/
> +STATIC
> +EFI_STATUS
> +ConcatenateSigList (
> +  IN  EFI_SIGNATURE_LIST *SigLists,
> +  IN  EFI_SIGNATURE_LIST *SigListAppend,
> +  OUT EFI_SIGNATURE_LIST **SigListOut,
> +  IN OUT UINTN           *SigListsSize
> +)
> +{
> +  EFI_SIGNATURE_LIST *TmpSigList;
> +  UINT8              *Offset;
> +  UINTN              NewSigListsSize;
> +
> +  NewSigListsSize = *SigListsSize + SigListAppend->SignatureListSize;
> +
> +  TmpSigList = (EFI_SIGNATURE_LIST *) AllocateZeroPool (NewSigListsSize);
> +  if (TmpSigList == NULL) {
> +    return EFI_OUT_OF_RESOURCES;
> +  }
> +
> +  CopyMem (TmpSigList, SigLists, *SigListsSize);
> +
> +  Offset = (UINT8 *)TmpSigList;
> +  Offset += *SigListsSize;
> +  CopyMem ((VOID *)Offset, SigListAppend, SigListAppend->SignatureListSize);
> +
> +  *SigListsSize = NewSigListsSize;
> +  *SigListOut = TmpSigList;
> +  return EFI_SUCCESS;
> +}
> +
> +/**
> +  Create a EFI Signature List with data fetched from section specified as a
> argument.
> +  Found keys are verified using RsaGetPublicKeyFromX509().
> +
> +  @param[in]        KeyFileGuid    A pointer to to the FFS filename GUID
> +  @param[out]       SigListsSize   A pointer to size of signature list
> +  @param[out]       SigListsOut    a pointer to a callee-allocated buffer with
> signature lists
> +
> +  @retval EFI_SUCCESS              Create time based payload successfully.
> +  @retval EFI_NOT_FOUND            Section with key has not been found.
> +  @retval EFI_INVALID_PARAMETER    Embedded key has a wrong format.
> +  @retval Others                   Unexpected error happens.
> +
> +--*/
> +STATIC
> +EFI_STATUS
> +SecureBootFetchData (
> +    IN  EFI_GUID           *KeyFileGuid,
> +    OUT UINTN              *SigListsSize,
> +    OUT EFI_SIGNATURE_LIST **SigListOut
> +)
> +{
> +  EFI_SIGNATURE_LIST *EfiSig;
> +  EFI_SIGNATURE_LIST *TmpEfiSig;
> +  EFI_SIGNATURE_LIST *TmpEfiSig2;
> +  EFI_STATUS         Status;
> +  VOID               *Buffer;
> +  VOID               *RsaPubKey;
> +  UINTN               Size;
> +  UINTN               KeyIndex;
> +
> +
> +  KeyIndex = 0;
> +  EfiSig = NULL;
> +  *SigListsSize = 0;
> +  while (1) {
> +    Status = GetSectionFromAnyFv (
> +               KeyFileGuid,
> +               EFI_SECTION_RAW,
> +               KeyIndex,
> +               &Buffer,
> +               &Size
> +               );
> +
> +    if (Status == EFI_SUCCESS) {
> +      RsaPubKey = NULL;
> +      if (RsaGetPublicKeyFromX509 (Buffer, Size, &RsaPubKey) == FALSE) {
> +        DEBUG ((DEBUG_ERROR, "%a: Invalid key format: %d\n", __FUNCTION__,
> KeyIndex));
> +        if (EfiSig != NULL) {
> +          FreePool(EfiSig);
> +        }
> +        FreePool(Buffer);
> +        return EFI_INVALID_PARAMETER;
> +      }
> +
> +      Status = CreateSigList (Buffer, Size, &TmpEfiSig);
> +
> +      //
> +      // Concatenate lists if more than one section found
> +      //
> +      if (KeyIndex == 0) {
> +        EfiSig = TmpEfiSig;
> +        *SigListsSize = TmpEfiSig->SignatureListSize;
> +      } else {
> +        ConcatenateSigList (EfiSig, TmpEfiSig, &TmpEfiSig2, SigListsSize);
> +        FreePool (EfiSig);
> +        FreePool (TmpEfiSig);
> +        EfiSig = TmpEfiSig2;
> +      }
> +
> +      KeyIndex++;
> +      FreePool (Buffer);
> +    } if (Status == EFI_NOT_FOUND) {
> +      break;
> +    }
> +  };
> +
> +  if (KeyIndex == 0) {
> +    return EFI_NOT_FOUND;
> +  }
> +
> +  *SigListOut = EfiSig;
> +
> +  return EFI_SUCCESS;
> +}
> +
> +/**
> +  Create a time based data payload by concatenating the
> EFI_VARIABLE_AUTHENTICATION_2
> +  descriptor with the input data. NO authentication is required in this function.
> +
> +  @param[in, out]   DataSize       On input, the size of Data buffer in bytes.
> +                                   On output, the size of data returned in Data
> +                                   buffer in bytes.
> +  @param[in, out]   Data           On input, Pointer to data buffer to be wrapped
> or
> +                                   pointer to NULL to wrap an empty payload.
> +                                   On output, Pointer to the new payload date buffer allocated
> from pool,
> +                                   it's caller's responsibility to free the memory when finish
> using it.
> +
> +  @retval EFI_SUCCESS              Create time based payload successfully.
> +  @retval EFI_OUT_OF_RESOURCES     There are not enough memory resources
> to create time based payload.
> +  @retval EFI_INVALID_PARAMETER    The parameter is invalid.
> +  @retval Others                   Unexpected error happens.
> +
> +--*/
> +EFI_STATUS
> +CreateTimeBasedPayload (
> +  IN OUT UINTN            *DataSize,
> +  IN OUT UINT8            **Data
> +  )
> +{
> +  EFI_STATUS                       Status;
> +  UINT8                            *NewData;
> +  UINT8                            *Payload;
> +  UINTN                            PayloadSize;
> +  EFI_VARIABLE_AUTHENTICATION_2    *DescriptorData;
> +  UINTN                            DescriptorSize;
> +  EFI_TIME                         Time;
> +
> +  if (Data == NULL || DataSize == NULL) {
> +    return EFI_INVALID_PARAMETER;
> +  }
> +
> +  //
> +  // In Setup mode or Custom mode, the variable does not need to be signed
> but the
> +  // parameters to the SetVariable() call still need to be prepared as
> authenticated
> +  // variable. So we create EFI_VARIABLE_AUTHENTICATED_2 descriptor
> without certificate
> +  // data in it.
> +  //
> +  Payload     = *Data;
> +  PayloadSize = *DataSize;
> +
> +  DescriptorSize    = OFFSET_OF (EFI_VARIABLE_AUTHENTICATION_2, AuthInfo)
> + OFFSET_OF (WIN_CERTIFICATE_UEFI_GUID, CertData);
> +  NewData = (UINT8*) AllocateZeroPool (DescriptorSize + PayloadSize);
> +  if (NewData == NULL) {
> +    return EFI_OUT_OF_RESOURCES;
> +  }
> +
> +  if ((Payload != NULL) && (PayloadSize != 0)) {
> +    CopyMem (NewData + DescriptorSize, Payload, PayloadSize);
> +  }
> +
> +  DescriptorData = (EFI_VARIABLE_AUTHENTICATION_2 *) (NewData);
> +
> +  ZeroMem (&Time, sizeof (EFI_TIME));
> +  Status = gRT->GetTime (&Time, NULL);
> +  if (EFI_ERROR (Status)) {
> +    FreePool(NewData);
> +    return Status;
> +  }
> +  Time.Pad1       = 0;
> +  Time.Nanosecond = 0;
> +  Time.TimeZone   = 0;
> +  Time.Daylight   = 0;
> +  Time.Pad2       = 0;
> +  CopyMem (&DescriptorData->TimeStamp, &Time, sizeof (EFI_TIME));
> +
> +  DescriptorData->AuthInfo.Hdr.dwLength         = OFFSET_OF
> (WIN_CERTIFICATE_UEFI_GUID, CertData);
> +  DescriptorData->AuthInfo.Hdr.wRevision        = 0x0200;
> +  DescriptorData->AuthInfo.Hdr.wCertificateType =
> WIN_CERT_TYPE_EFI_GUID;
> +  CopyGuid (&DescriptorData->AuthInfo.CertType, &gEfiCertPkcs7Guid);
> +
> +  if (Payload != NULL) {
> +    FreePool(Payload);
> +  }
> +
> +  *DataSize = DescriptorSize + PayloadSize;
> +  *Data     = NewData;
> +  return EFI_SUCCESS;
> +}
> +
> +/**
> +  Internal helper function to delete a Variable given its name and GUID, NO
> authentication
> +  required.
> +
> +  @param[in]      VariableName            Name of the Variable.
> +  @param[in]      VendorGuid              GUID of the Variable.
> +
> +  @retval EFI_SUCCESS              Variable deleted successfully.
> +  @retval Others                   The driver failed to start the device.
> +
> +--*/
> +EFI_STATUS
> +DeleteVariable (
> +  IN  CHAR16                    *VariableName,
> +  IN  EFI_GUID                  *VendorGuid
> +  )
> +{
> +  EFI_STATUS              Status;
> +  VOID*                   Variable;
> +  UINT8                   *Data;
> +  UINTN                   DataSize;
> +  UINT32                  Attr;
> +
> +  GetVariable2 (VariableName, VendorGuid, &Variable, NULL);
> +  if (Variable == NULL) {
> +    return EFI_SUCCESS;
> +  }
> +  FreePool (Variable);
> +
> +  Data     = NULL;
> +  DataSize = 0;
> +  Attr     = EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_RUNTIME_ACCESS |
> EFI_VARIABLE_BOOTSERVICE_ACCESS
> +             | EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS;
> +
> +  Status = CreateTimeBasedPayload (&DataSize, &Data);
> +  if (EFI_ERROR (Status)) {
> +    DEBUG ((DEBUG_ERROR, "Fail to create time-based data payload: %r",
> Status));
> +    return Status;
> +  }
> +
> +  Status = gRT->SetVariable (
> +                  VariableName,
> +                  VendorGuid,
> +                  Attr,
> +                  DataSize,
> +                  Data
> +                  );
> +  if (Data != NULL) {
> +    FreePool (Data);
> +  }
> +  return Status;
> +}
> +
> +/**
> +
> +  Set the platform secure boot mode into "Custom" or "Standard" mode.
> +
> +  @param[in]   SecureBootMode        New secure boot mode:
> STANDARD_SECURE_BOOT_MODE or
> +                                     CUSTOM_SECURE_BOOT_MODE.
> +
> +  @return EFI_SUCCESS                The platform has switched to the special mode
> successfully.
> +  @return other                      Fail to operate the secure boot mode.
> +
> +--*/
> +EFI_STATUS
> +SetSecureBootMode (
> +  IN  UINT8  SecureBootMode
> +  )
> +{
> +  return gRT->SetVariable (
> +                EFI_CUSTOM_MODE_NAME,
> +                &gEfiCustomModeEnableGuid,
> +                EFI_VARIABLE_NON_VOLATILE |
> EFI_VARIABLE_BOOTSERVICE_ACCESS,
> +                sizeof (UINT8),
> +                &SecureBootMode
> +                );
> +}
> +
> +
> +/**
> +  Enroll a key/certificate based on a default variable.
> +
> +  @param[in] VariableName        The name of the key/database.
> +  @param[in] DefaultName         The name of the default variable.
> +  @param[in] VendorGuid          The namespace (ie. vendor GUID) of the
> variable
> +
> +
> +  @retval EFI_OUT_OF_RESOURCES   Out of memory while allocating
> AuthHeader.
> +  @retval EFI_SUCCESS            Successful enrollment.
> +  @return                        Error codes from GetTime () and SetVariable ().
> +--*/
> +STATIC
> +EFI_STATUS
> +EnrollFromDefault (
> +  IN CHAR16   *VariableName,
> +  IN CHAR16   *DefaultName,
> +  IN EFI_GUID *VendorGuid
> +  )
> +{
> +  VOID       *Data;
> +  UINTN       DataSize;
> +  EFI_STATUS  Status;
> +
> +  Status = EFI_SUCCESS;
> +
> +  DataSize = 0;
> +  Status = GetVariable2 (DefaultName, &gEfiGlobalVariableGuid, &Data,
> &DataSize);
> +  if (EFI_ERROR (Status)) {
> +      DEBUG ((DEBUG_ERROR, "error: GetVariable (\"%s): %r\n", DefaultName,
> Status));
> +      return Status;
> +  }
> +
> +  CreateTimeBasedPayload (&DataSize, (UINT8 **)&Data);
> +  if (EFI_ERROR (Status)) {
> +    DEBUG ((DEBUG_ERROR, "Fail to create time-based data payload: %r",
> Status));
> +    return Status;
> +  }
> +
> +  //
> +  // Allocate memory for auth variable
> +  //
> +  Status = gRT->SetVariable (
> +                  VariableName,
> +                  VendorGuid,
> +                  (EFI_VARIABLE_NON_VOLATILE |
> +                   EFI_VARIABLE_BOOTSERVICE_ACCESS |
> +                   EFI_VARIABLE_RUNTIME_ACCESS |
> +                   EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS),
> +                  DataSize,
> +                  Data
> +                  );
> +
> +  if (EFI_ERROR (Status)) {
> +    DEBUG ((DEBUG_ERROR, "error: %a (\"%s\", %g): %r\n", __FUNCTION__,
> VariableName,
> +      VendorGuid, Status));
> +  }
> +
> +  if (Data != NULL) {
> +    FreePool (Data);
> +  }
> +
> +  return Status;
> +}
> +
> +/** Initializes PKDefault variable with data from FFS section.
> +
> +
> +  @retval  EFI_SUCCESS           Variable was initialized successfully.
> +  @retval  EFI_UNSUPPORTED       Variable already exists.
> +--*/
> +EFI_STATUS
> +SecureBootInitPKDefault (
> +  IN VOID
> +  )
> +{
> +  EFI_SIGNATURE_LIST *EfiSig;
> +  UINTN               SigListsSize;
> +  EFI_STATUS          Status;
> +  UINT8               *Data;
> +  UINTN               DataSize;
> +
> +  //
> +  // Check if variable exists, if so do not change it
> +  //
> +  Status = GetVariable2 (EFI_PK_DEFAULT_VARIABLE_NAME,
> &gEfiGlobalVariableGuid, (VOID **) &Data, &DataSize);
> +  if (Status == EFI_SUCCESS) {
> +    DEBUG ((DEBUG_INFO, "Variable %s exists. Old value is preserved\n",
> EFI_PK_DEFAULT_VARIABLE_NAME));
> +    FreePool (Data);
> +    return EFI_UNSUPPORTED;
> +  }
> +
> +  if (EFI_ERROR (Status) && (Status != EFI_NOT_FOUND)) {
> +    return Status;
> +  }
> +
> +  //
> +  // Variable does not exist, can be initialized
> +  //
> +  DEBUG ((DEBUG_INFO, "Variable %s does not exist.\n",
> EFI_PK_DEFAULT_VARIABLE_NAME));
> +
> +  Status = SecureBootFetchData (&gDefaultPKFileGuid, &SigListsSize, &EfiSig);
> +  if (EFI_ERROR (Status)) {
> +    DEBUG ((DEBUG_INFO, "Content for %s not found\n",
> EFI_PK_DEFAULT_VARIABLE_NAME));
> +    return Status;
> +  }
> +
> +  Status = gRT->SetVariable (
> +                  EFI_PK_DEFAULT_VARIABLE_NAME,
> +                  &gEfiGlobalVariableGuid,
> +                  EFI_VARIABLE_RUNTIME_ACCESS |
> EFI_VARIABLE_BOOTSERVICE_ACCESS,
> +                  SigListsSize,
> +                  (VOID *)EfiSig
> +                  );
> +  if (EFI_ERROR (Status)) {
> +    DEBUG ((DEBUG_INFO, "Failed to set %s\n",
> EFI_PK_DEFAULT_VARIABLE_NAME));
> +  }
> +
> +  FreePool (EfiSig);
> +
> +  return Status;
> +}
> +
> +/** Initializes KEKDefault variable with data from FFS section.
> +
> +
> +  @retval  EFI_SUCCESS           Variable was initialized successfully.
> +  @retval  EFI_UNSUPPORTED       Variable already exists.
> +--*/
> +EFI_STATUS
> +SecureBootInitKEKDefault (
> +  IN VOID
> +  )
> +{
> +  EFI_SIGNATURE_LIST *EfiSig;
> +  UINTN               SigListsSize;
> +  EFI_STATUS          Status;
> +  UINT8              *Data;
> +  UINTN               DataSize;
> +
> +  //
> +  // Check if variable exists, if so do not change it
> +  //
> +  Status = GetVariable2 (EFI_KEK_DEFAULT_VARIABLE_NAME,
> &gEfiGlobalVariableGuid, (VOID **) &Data, &DataSize);
> +  if (Status == EFI_SUCCESS) {
> +    DEBUG ((DEBUG_INFO, "Variable %s exists. Old value is preserved\n",
> EFI_KEK_DEFAULT_VARIABLE_NAME));
> +    FreePool (Data);
> +    return EFI_UNSUPPORTED;
> +  }
> +
> +  if (EFI_ERROR (Status) && (Status != EFI_NOT_FOUND)) {
> +    return Status;
> +  }
> +
> +  //
> +  // Variable does not exist, can be initialized
> +  //
> +  DEBUG ((DEBUG_INFO, "Variable %s does not exist.\n",
> EFI_KEK_DEFAULT_VARIABLE_NAME));
> +
> +  Status = SecureBootFetchData (&gDefaultKEKFileGuid, &SigListsSize, &EfiSig);
> +  if (EFI_ERROR (Status)) {
> +    DEBUG ((DEBUG_INFO, "Content for %s not found\n",
> EFI_KEK_DEFAULT_VARIABLE_NAME));
> +    return Status;
> +  }
> +
> +
> +  Status = gRT->SetVariable (
> +                  EFI_KEK_DEFAULT_VARIABLE_NAME,
> +                  &gEfiGlobalVariableGuid,
> +                  EFI_VARIABLE_RUNTIME_ACCESS |
> EFI_VARIABLE_BOOTSERVICE_ACCESS,
> +                  SigListsSize,
> +                  (VOID *)EfiSig
> +                  );
> +  if (EFI_ERROR (Status)) {
> +    DEBUG ((DEBUG_INFO, "Failed to set %s\n",
> EFI_KEK_DEFAULT_VARIABLE_NAME));
> +  }
> +
> +  FreePool (EfiSig);
> +
> +  return Status;
> +}
> +
> +/** Initializes dbDefault variable with data from FFS section.
> +
> +
> +  @retval  EFI_SUCCESS           Variable was initialized successfully.
> +  @retval  EFI_UNSUPPORTED       Variable already exists.
> +--*/
> +EFI_STATUS
> +SecureBootInitdbDefault (
> +  IN VOID
> +  )
> +{
> +  EFI_SIGNATURE_LIST *EfiSig;
> +  UINTN               SigListsSize;
> +  EFI_STATUS          Status;
> +  UINT8              *Data;
> +  UINTN               DataSize;
> +
> +  Status = GetVariable2 (EFI_DB_DEFAULT_VARIABLE_NAME,
> &gEfiGlobalVariableGuid, (VOID **) &Data, &DataSize);
> +  if (Status == EFI_SUCCESS) {
> +    DEBUG ((DEBUG_INFO, "Variable %s exists. Old value is preserved\n",
> EFI_DB_DEFAULT_VARIABLE_NAME));
> +    FreePool (Data);
> +    return EFI_UNSUPPORTED;
> +  }
> +
> +  if (EFI_ERROR (Status) && (Status != EFI_NOT_FOUND)) {
> +    return Status;
> +  }
> +
> +  DEBUG ((DEBUG_INFO, "Variable %s does not exist.\n",
> EFI_DB_DEFAULT_VARIABLE_NAME));
> +
> +  Status = SecureBootFetchData (&gDefaultdbFileGuid, &SigListsSize, &EfiSig);
> +  if (EFI_ERROR (Status)) {
> +      return Status;
> +  }
> +
> +  Status = gRT->SetVariable (
> +                  EFI_DB_DEFAULT_VARIABLE_NAME,
> +                  &gEfiGlobalVariableGuid,
> +                  EFI_VARIABLE_RUNTIME_ACCESS |
> EFI_VARIABLE_BOOTSERVICE_ACCESS,
> +                  SigListsSize,
> +                  (VOID *)EfiSig
> +                  );
> +  if (EFI_ERROR (Status)) {
> +      DEBUG ((DEBUG_INFO, "Failed to set %s\n",
> EFI_DB_DEFAULT_VARIABLE_NAME));
> +  }
> +
> +  FreePool (EfiSig);
> +
> +  return Status;
> +}
> +
> +/** Initializes dbxDefault variable with data from FFS section.
> +
> +
> +  @retval  EFI_SUCCESS           Variable was initialized successfully.
> +  @retval  EFI_UNSUPPORTED       Variable already exists.
> +--*/
> +EFI_STATUS
> +SecureBootInitdbxDefault (
> +  IN VOID
> +  )
> +{
> +  EFI_SIGNATURE_LIST *EfiSig;
> +  UINTN               SigListsSize;
> +  EFI_STATUS          Status;
> +  UINT8              *Data;
> +  UINTN               DataSize;
> +
> +  //
> +  // Check if variable exists, if so do not change it
> +  //
> +  Status = GetVariable2 (EFI_DBX_DEFAULT_VARIABLE_NAME,
> &gEfiGlobalVariableGuid, (VOID **) &Data, &DataSize);
> +  if (Status == EFI_SUCCESS) {
> +    DEBUG ((DEBUG_INFO, "Variable %s exists. Old value is preserved\n",
> EFI_DBX_DEFAULT_VARIABLE_NAME));
> +    FreePool (Data);
> +    return EFI_UNSUPPORTED;
> +  }
> +
> +  if (EFI_ERROR (Status) && (Status != EFI_NOT_FOUND)) {
> +    return Status;
> +  }
> +
> +  //
> +  // Variable does not exist, can be initialized
> +  //
> +  DEBUG ((DEBUG_INFO, "Variable %s does not exist.\n",
> EFI_DBX_DEFAULT_VARIABLE_NAME));
> +
> +  Status = SecureBootFetchData (&gDefaultdbxFileGuid, &SigListsSize, &EfiSig);
> +  if (EFI_ERROR (Status)) {
> +    DEBUG ((DEBUG_INFO, "Content for %s not found\n",
> EFI_DBX_DEFAULT_VARIABLE_NAME));
> +    return Status;
> +  }
> +
> +  Status = gRT->SetVariable (
> +                  EFI_DBX_DEFAULT_VARIABLE_NAME,
> +                  &gEfiGlobalVariableGuid,
> +                  EFI_VARIABLE_RUNTIME_ACCESS |
> EFI_VARIABLE_BOOTSERVICE_ACCESS,
> +                  SigListsSize,
> +                  (VOID *)EfiSig
> +                  );
> +  if (EFI_ERROR (Status)) {
> +    DEBUG ((DEBUG_INFO, "Failed to set %s\n",
> EFI_DBX_DEFAULT_VARIABLE_NAME));
> +  }
> +
> +  FreePool (EfiSig);
> +
> +  return Status;
> +}
> +
> +/** Initializes dbtDefault variable with data from FFS section.
> +
> +
> +  @retval  EFI_SUCCESS           Variable was initialized successfully.
> +  @retval  EFI_UNSUPPORTED       Variable already exists.
> +--*/
> +EFI_STATUS
> +SecureBootInitdbtDefault (
> +  IN VOID
> +  )
> +{
> +  EFI_SIGNATURE_LIST *EfiSig;
> +  UINTN               SigListsSize;
> +  EFI_STATUS          Status;
> +  UINT8              *Data;
> +  UINTN               DataSize;
> +
> +  //
> +  // Check if variable exists, if so do not change it
> +  //
> +  Status = GetVariable2 (EFI_DBT_DEFAULT_VARIABLE_NAME,
> &gEfiGlobalVariableGuid, (VOID **) &Data, &DataSize);
> +  if (Status == EFI_SUCCESS) {
> +    DEBUG ((DEBUG_INFO, "Variable %s exists. Old value is preserved\n",
> EFI_DBT_DEFAULT_VARIABLE_NAME));
> +    FreePool (Data);
> +    return EFI_UNSUPPORTED;
> +  }
> +
> +  if (EFI_ERROR (Status) && (Status != EFI_NOT_FOUND)) {
> +    return Status;
> +  }
> +
> +  //
> +  // Variable does not exist, can be initialized
> +  //
> +  DEBUG ((DEBUG_INFO, "Variable %s does not exist.\n",
> EFI_DBT_DEFAULT_VARIABLE_NAME));
> +
> +  Status = SecureBootFetchData (&gDefaultdbtFileGuid, &SigListsSize, &EfiSig);
> +  if (EFI_ERROR (Status)) {
> +      return Status;
> +  }
> +
> +  Status = gRT->SetVariable (
> +                  EFI_DBT_DEFAULT_VARIABLE_NAME,
> +                  &gEfiGlobalVariableGuid,
> +                  EFI_VARIABLE_RUNTIME_ACCESS |
> EFI_VARIABLE_BOOTSERVICE_ACCESS,
> +                  SigListsSize,
> +                  (VOID *)EfiSig
> +                  );
> +  if (EFI_ERROR (Status)) {
> +    DEBUG ((DEBUG_INFO, "Failed to set %s\n",
> EFI_DBT_DEFAULT_VARIABLE_NAME));
> +  }
> +
> +  FreePool (EfiSig);
> +
> +  return EFI_SUCCESS;
> +}
> +
> +/**
> +  Fetches the value of SetupMode variable.
> +
> +  @param[out] SetupMode             Pointer to UINT8 for SetupMode output
> +
> +  @retval other                     Retval from GetVariable.
> +--*/
> +EFI_STATUS
> +EFIAPI
> +GetSetupMode (
> +    OUT UINT8 *SetupMode
> +)
> +{
> +  UINTN      Size;
> +  EFI_STATUS Status;
> +
> +  Size = sizeof (*SetupMode);
> +  Status = gRT->GetVariable (
> +                  EFI_SETUP_MODE_NAME,
> +                  &gEfiGlobalVariableGuid,
> +                  NULL,
> +                  &Size,
> +                  SetupMode
> +                  );
> +  if (EFI_ERROR (Status)) {
> +    return Status;
> +  }
> +
> +  return EFI_SUCCESS;
> +}
> +
> +/**
> +  Sets the content of the 'db' variable based on 'dbDefault' variable content.
> +
> +  @retval EFI_OUT_OF_RESOURCES      If memory allocation for
> EFI_VARIABLE_AUTHENTICATION_2 fails
> +                                    while VendorGuid is NULL.
> +  @retval other                     Errors from GetVariable2 (), GetTime () and
> SetVariable ()
> +--*/
> +EFI_STATUS
> +EFIAPI
> +EnrollDbFromDefault (
> +  VOID
> +)
> +{
> +  EFI_STATUS Status;
> +
> +  Status = EnrollFromDefault (
> +             EFI_IMAGE_SECURITY_DATABASE,
> +             EFI_DB_DEFAULT_VARIABLE_NAME,
> +             &gEfiImageSecurityDatabaseGuid
> +             );
> +
> +  return Status;
> +}
> +
> +/**
> +  Clears the content of the 'db' variable.
> +
> +  @retval EFI_OUT_OF_RESOURCES      If memory allocation for
> EFI_VARIABLE_AUTHENTICATION_2 fails
> +                                    while VendorGuid is NULL.
> +  @retval other                     Errors from GetVariable2 (), GetTime () and
> SetVariable ()
> +--*/
> +EFI_STATUS
> +EFIAPI
> +DeleteDb (
> +  VOID
> +)
> +{
> +  EFI_STATUS Status;
> +
> +  Status = DeleteVariable (
> +             EFI_IMAGE_SECURITY_DATABASE,
> +             &gEfiImageSecurityDatabaseGuid
> +             );
> +
> +  return Status;
> +}
> +
> +/**
> +  Sets the content of the 'dbx' variable based on 'dbxDefault' variable content.
> +
> +  @retval EFI_OUT_OF_RESOURCES      If memory allocation for
> EFI_VARIABLE_AUTHENTICATION_2 fails
> +                                    while VendorGuid is NULL.
> +  @retval other                     Errors from GetVariable2 (), GetTime () and
> SetVariable ()
> +--*/
> +EFI_STATUS
> +EFIAPI
> +EnrollDbxFromDefault (
> +  VOID
> +)
> +{
> +  EFI_STATUS Status;
> +
> +  Status = EnrollFromDefault (
> +             EFI_IMAGE_SECURITY_DATABASE1,
> +             EFI_DBX_DEFAULT_VARIABLE_NAME,
> +             &gEfiImageSecurityDatabaseGuid
> +             );
> +
> +  return Status;
> +}
> +
> +/**
> +  Clears the content of the 'dbx' variable.
> +
> +  @retval EFI_OUT_OF_RESOURCES      If memory allocation for
> EFI_VARIABLE_AUTHENTICATION_2 fails
> +                                    while VendorGuid is NULL.
> +  @retval other                     Errors from GetVariable2 (), GetTime () and
> SetVariable ()
> +--*/
> +EFI_STATUS
> +EFIAPI
> +DeleteDbx (
> +  VOID
> +)
> +{
> +  EFI_STATUS Status;
> +
> +  Status = DeleteVariable (
> +             EFI_IMAGE_SECURITY_DATABASE1,
> +             &gEfiImageSecurityDatabaseGuid
> +             );
> +
> +  return Status;
> +}
> +
> +/**
> +  Sets the content of the 'dbt' variable based on 'dbtDefault' variable content.
> +
> +  @retval EFI_OUT_OF_RESOURCES      If memory allocation for
> EFI_VARIABLE_AUTHENTICATION_2 fails
> +                                    while VendorGuid is NULL.
> +  @retval other                     Errors from GetVariable2 (), GetTime () and
> SetVariable ()
> +--*/
> +EFI_STATUS
> +EFIAPI
> +EnrollDbtFromDefault (
> +  VOID
> +)
> +{
> +  EFI_STATUS Status;
> +
> +  Status = EnrollFromDefault (
> +             EFI_IMAGE_SECURITY_DATABASE2,
> +             EFI_DBT_DEFAULT_VARIABLE_NAME,
> +             &gEfiImageSecurityDatabaseGuid);
> +
> +  return Status;
> +}
> +
> +/**
> +  Clears the content of the 'dbt' variable.
> +
> +  @retval EFI_OUT_OF_RESOURCES      If memory allocation for
> EFI_VARIABLE_AUTHENTICATION_2 fails
> +                                    while VendorGuid is NULL.
> +  @retval other                     Errors from GetVariable2 (), GetTime () and
> SetVariable ()
> +--*/
> +EFI_STATUS
> +EFIAPI
> +DeleteDbt (
> +  VOID
> +)
> +{
> +  EFI_STATUS Status;
> +
> +  Status = DeleteVariable (
> +             EFI_IMAGE_SECURITY_DATABASE2,
> +             &gEfiImageSecurityDatabaseGuid
> +             );
> +
> +  return Status;
> +}
> +
> +/**
> +  Sets the content of the 'KEK' variable based on 'KEKDefault' variable content.
> +
> +  @retval EFI_OUT_OF_RESOURCES      If memory allocation for
> EFI_VARIABLE_AUTHENTICATION_2 fails
> +                                    while VendorGuid is NULL.
> +  @retval other                     Errors from GetVariable2 (), GetTime () and
> SetVariable ()
> +--*/
> +EFI_STATUS
> +EFIAPI
> +EnrollKEKFromDefault (
> +  VOID
> +)
> +{
> +  EFI_STATUS Status;
> +
> +  Status = EnrollFromDefault (
> +             EFI_KEY_EXCHANGE_KEY_NAME,
> +             EFI_KEK_DEFAULT_VARIABLE_NAME,
> +             &gEfiGlobalVariableGuid
> +             );
> +
> +  return Status;
> +}
> +
> +/**
> +  Clears the content of the 'KEK' variable.
> +
> +  @retval EFI_OUT_OF_RESOURCES      If memory allocation for
> EFI_VARIABLE_AUTHENTICATION_2 fails
> +                                    while VendorGuid is NULL.
> +  @retval other                     Errors from GetVariable2 (), GetTime () and
> SetVariable ()
> +--*/
> +EFI_STATUS
> +EFIAPI
> +DeleteKEK (
> +  VOID
> +)
> +{
> +  EFI_STATUS Status;
> +
> +  Status = DeleteVariable (
> +             EFI_KEY_EXCHANGE_KEY_NAME,
> +             &gEfiGlobalVariableGuid
> +             );
> +
> +  return Status;
> +}
> +
> +/**
> +  Sets the content of the 'KEK' variable based on 'KEKDefault' variable content.
> +
> +  @retval EFI_OUT_OF_RESOURCES      If memory allocation for
> EFI_VARIABLE_AUTHENTICATION_2 fails
> +                                    while VendorGuid is NULL.
> +  @retval other                     Errors from GetVariable2 (), GetTime () and
> SetVariable ()
> +--*/
> +EFI_STATUS
> +EFIAPI
> +EnrollPKFromDefault (
> +  VOID
> +)
> +{
> +  EFI_STATUS Status;
> +
> +  Status = EnrollFromDefault (
> +             EFI_PLATFORM_KEY_NAME,
> +             EFI_PK_DEFAULT_VARIABLE_NAME,
> +             &gEfiGlobalVariableGuid
> +             );
> +
> +  return Status;
> +}
> +
> +/**
> +  Remove the PK variable.
> +
> +  @retval EFI_SUCCESS    Delete PK successfully.
> +  @retval Others         Could not allow to delete PK.
> +
> +--*/
> +EFI_STATUS
> +EFIAPI
> +DeletePlatformKey (
> +  VOID
> +)
> +{
> +  EFI_STATUS Status;
> +
> +  Status = SetSecureBootMode(CUSTOM_SECURE_BOOT_MODE);
> +  if (EFI_ERROR (Status)) {
> +    return Status;
> +  }
> +
> +  Status = DeleteVariable (
> +             EFI_PLATFORM_KEY_NAME,
> +             &gEfiGlobalVariableGuid
> +             );
> +  return Status;
> +}
> diff --git
> a/SecurityPkg/Library/SecureBootVariableLib/SecureBootVariableLib.uni
> b/SecurityPkg/Library/SecureBootVariableLib/SecureBootVariableLib.uni
> new file mode 100644
> index 0000000000..2c51e4db53
> --- /dev/null
> +++ b/SecurityPkg/Library/SecureBootVariableLib/SecureBootVariableLib.uni
> @@ -0,0 +1,16 @@
> +// /** @file
> +//
> +// Provides initialization of Secure Boot keys and databases.
> +//
> +// Copyright (c) 2021, ARM Ltd. All rights reserved.<BR>
> +// Copyright (c) 2021, Semihalf All rights reserved.<BR>
> +//
> +// SPDX-License-Identifier: BSD-2-Clause-Patent
> +//
> +// **/
> +
> +
> +#string STR_MODULE_ABSTRACT             #language en-US "Provides function to
> initialize PK, KEK and databases based on default variables."
> +
> +#string STR_MODULE_DESCRIPTION          #language en-US "Provides function
> to initialize PK, KEK and databases based on default variables."
> +
> --
> 2.25.1