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diff --git a/SecurityPkg/VariableAuthenticated/Pei/Variable.h b/SecurityPkg/VariableAuthenticated/Pei/Variable.h
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+++ b/SecurityPkg/VariableAuthenticated/Pei/Variable.h
@@ -0,0 +1,128 @@
+/** @file
+  The internal header file includes the common header files, defines
+  internal structure and functions used by PeiVariable module.
+
+Copyright (c) 2009 - 2011, Intel Corporation. All rights reserved.<BR>
+This program and the accompanying materials 
+are licensed and made available under the terms and conditions of the BSD License 
+which accompanies this distribution.  The full text of the license may be found at 
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef _PEI_VARIABLE_H_
+#define _PEI_VARIABLE_H_
+
+#include <PiPei.h>
+#include <Ppi/ReadOnlyVariable2.h>
+
+#include <Library/DebugLib.h>
+#include <Library/PeimEntryPoint.h>
+#include <Library/HobLib.h>
+#include <Library/PcdLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/PeiServicesTablePointerLib.h>
+#include <Library/PeiServicesLib.h>
+
+#include <Guid/AuthenticatedVariableFormat.h>
+#include <Guid/VariableIndexTable.h>
+//
+// Functions
+//
+/**
+  Provide the functionality of the variable services.
+  
+  @param  FileHandle  Handle of the file being invoked. 
+                      Type EFI_PEI_FILE_HANDLE is defined in FfsFindNextFile().
+  @param  PeiServices  General purpose services available to every PEIM.
+
+  @retval EFI_SUCCESS  If the interface could be successfully installed
+  @retval Others       Returned from PeiServicesInstallPpi()
+
+**/
+EFI_STATUS
+EFIAPI
+PeimInitializeVariableServices (
+  IN       EFI_PEI_FILE_HANDLE       FileHandle,
+  IN CONST EFI_PEI_SERVICES          **PeiServices
+  );
+
+/**
+  This service retrieves a variable's value using its name and GUID.
+
+  Read the specified variable from the UEFI variable store. If the Data 
+  buffer is too small to hold the contents of the variable, the error
+  EFI_BUFFER_TOO_SMALL is returned and DataSize is set to the required buffer
+  size to obtain the data.
+
+  @param  This                  A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI.
+  @param  VariableName          A pointer to a null-terminated string that is the variable's name.
+  @param  VariableGuid          A pointer to an EFI_GUID that is the variable's GUID. The combination of
+                                VariableGuid and VariableName must be unique.
+  @param  Attributes            If non-NULL, on return, points to the variable's attributes.
+  @param  DataSize              On entry, points to the size in bytes of the Data buffer.
+                                On return, points to the size of the data returned in Data.
+  @param  Data                  Points to the buffer which will hold the returned variable value.
+
+  @retval EFI_SUCCESS           The variable was read successfully.
+  @retval EFI_NOT_FOUND         The variable could not be found.
+  @retval EFI_BUFFER_TOO_SMALL  The DataSize is too small for the resulting data. 
+                                DataSize is updated with the size required for 
+                                the specified variable.
+  @retval EFI_INVALID_PARAMETER VariableName, VariableGuid, DataSize or Data is NULL.
+  @retval EFI_DEVICE_ERROR      The variable could not be retrieved because of a device error.
+
+**/
+EFI_STATUS
+EFIAPI
+PeiGetVariable (
+  IN CONST  EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,
+  IN CONST  CHAR16                          *VariableName,
+  IN CONST  EFI_GUID                        *VariableGuid,
+  OUT       UINT32                          *Attributes,
+  IN OUT    UINTN                           *DataSize,
+  OUT       VOID                            *Data
+  );
+
+/**
+  Return the next variable name and GUID.
+
+  This function is called multiple times to retrieve the VariableName 
+  and VariableGuid of all variables currently available in the system. 
+  On each call, the previous results are passed into the interface, 
+  and, on return, the interface returns the data for the next 
+  interface. When the entire variable list has been returned, 
+  EFI_NOT_FOUND is returned.
+
+  @param  This              A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI.
+
+  @param  VariableNameSize  On entry, points to the size of the buffer pointed to by VariableName.
+  @param  VariableName      On entry, a pointer to a null-terminated string that is the variable's name.
+                            On return, points to the next variable's null-terminated name string.
+
+  @param  VariableGuid      On entry, a pointer to an UEFI _GUID that is the variable's GUID. 
+                            On return, a pointer to the next variable's GUID.
+
+  @retval EFI_SUCCESS           The variable was read successfully.
+  @retval EFI_NOT_FOUND         The variable could not be found.
+  @retval EFI_BUFFER_TOO_SMALL  The VariableNameSize is too small for the resulting
+                                data. VariableNameSize is updated with the size
+                                required for the specified variable.
+  @retval EFI_INVALID_PARAMETER VariableName, VariableGuid or
+                                VariableNameSize is NULL.
+  @retval EFI_DEVICE_ERROR      The variable could not be retrieved because of a device error.
+
+**/
+EFI_STATUS
+EFIAPI
+PeiGetNextVariableName (
+  IN CONST  EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,
+  IN OUT UINTN                              *VariableNameSize,
+  IN OUT CHAR16                             *VariableName,
+  IN OUT EFI_GUID                           *VariableGuid
+  );
+
+#endif