[Patch v2 14/28] SecurityPkg: Add null encryption variable libs

["Judah Vang" <judah.vang@intel.com>]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2594

Provide null ecryption variable libraries.
These will be used by default for platforms that don't
support protected variable encryption.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Nishant C Mistry <nishant.c.mistry@intel.com>
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Signed-off-by: Nishant C Mistry <nishant.c.mistry@intel.com>
Signed-off-by: Judah Vang <judah.vang@intel.com>
---
 SecurityPkg/Library/EncryptionVariableLibNull/EncryptionVariableLibNull.inf |  38 +++++++
 SecurityPkg/Library/EncryptionVariableLibNull/EncryptionVariable.c          | 107 ++++++++++++++++++++
 SecurityPkg/Library/EncryptionVariableLibNull/EncryptionVariableLibNull.uni |  16 +++
 3 files changed, 161 insertions(+)

diff --git a/SecurityPkg/Library/EncryptionVariableLibNull/EncryptionVariableLibNull.inf b/SecurityPkg/Library/EncryptionVariableLibNull/EncryptionVariableLibNull.inf
new file mode 100644
index 000000000000..ff5631b336eb
--- /dev/null
+++ b/SecurityPkg/Library/EncryptionVariableLibNull/EncryptionVariableLibNull.inf
@@ -0,0 +1,38 @@
+## @file
+#  Provides NULL version of encryption variable services.
+#
+#  Copyright (c) 2015 - 2022, Intel Corporation. All rights reserved.<BR>
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = EncryptionVariableLibNull
+  MODULE_UNI_FILE                = EncryptionVariableLib.uni
+  FILE_GUID                      = 3972E6FE-74D5-45C3-A9FB-DB9E5E5C9C17
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = EncryptionVariableLib
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64
+#
+
+[Sources]
+  EncryptionVariable.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  SecurityPkg/SecurityPkg.dec
+
+[LibraryClasses]
+  BaseLib
+  DebugLib
+
+[Guids]
+
diff --git a/SecurityPkg/Library/EncryptionVariableLibNull/EncryptionVariable.c b/SecurityPkg/Library/EncryptionVariableLibNull/EncryptionVariable.c
new file mode 100644
index 000000000000..58a4ae9f4282
--- /dev/null
+++ b/SecurityPkg/Library/EncryptionVariableLibNull/EncryptionVariable.c
@@ -0,0 +1,107 @@
+/** @file
+  The common variable operation routines shared by DXE_RUNTIME variable
+  module and DXE_SMM variable module.
+
+  Caution: This module requires additional review when modified.
+  This driver will have external input - variable data. They may be input in SMM mode.
+  This external input must be validated carefully to avoid security issue like
+  buffer overflow, integer overflow.
+
+  VariableServiceGetNextVariableName () and VariableServiceQueryVariableInfo() are external API.
+  They need check input parameter.
+
+  VariableServiceGetVariable() and VariableServiceSetVariable() are external API
+  to receive datasize and data buffer. The size should be checked carefully.
+
+  VariableServiceSetVariable() should also check authenticate data to avoid buffer overflow,
+  integer overflow. It should also check attribute to avoid authentication bypass.
+
+Copyright (c) 2019 - 2022, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Uefi.h>
+
+#include <Library/EncryptionVariableLib.h>
+#include <Library/DebugLib.h>
+
+/**
+  Encrypt variable data.
+
+  Null version.
+
+  @param[in, out]   VarEncInfo   Pointer to structure containing detailed
+                                 information about a variable.
+
+  @retval EFI_UNSUPPORTED         Unsupported to encrypt variable.
+
+**/
+EFI_STATUS
+EFIAPI
+EncryptVariable (
+  IN OUT VARIABLE_ENCRYPTION_INFO  *VarEncInfo
+  )
+{
+  return EFI_UNSUPPORTED;
+}
+
+/**
+  Decrypt variable data.
+
+  Null version.
+
+  @param[in, out]   VarEncInfo   Pointer to structure containing detailed
+                                 information about a variable.
+
+  @retval EFI_UNSUPPORTED         Unsupported to encrypt variable.
+
+**/
+EFI_STATUS
+EFIAPI
+DecryptVariable (
+  IN OUT VARIABLE_ENCRYPTION_INFO  *VarEncInfo
+  )
+{
+  return EFI_UNSUPPORTED;
+}
+
+/**
+  Get cipher information.
+
+  Null version.
+
+  @param[in]   VarEncInfo   Pointer to structure containing detailed
+                            information about a variable.
+
+  @retval EFI_UNSUPPORTED         Unsupported interface.
+
+**/
+EFI_STATUS
+EFIAPI
+GetCipherDataInfo (
+  IN VARIABLE_ENCRYPTION_INFO  *VarEncInfo
+  )
+{
+  return EFI_UNSUPPORTED;
+}
+
+/**
+  Set cipher information for a variable.
+
+  Null version.
+
+  @param[in]   VarEncInfo   Pointer to structure containing detailed
+                            information about a variable.
+
+  @retval EFI_UNSUPPORTED         If this method is not supported.
+
+**/
+EFI_STATUS
+EFIAPI
+SetCipherDataInfo (
+  IN VARIABLE_ENCRYPTION_INFO  *VarEncInfo
+  )
+{
+  return EFI_UNSUPPORTED;
+}
diff --git a/SecurityPkg/Library/EncryptionVariableLibNull/EncryptionVariableLibNull.uni b/SecurityPkg/Library/EncryptionVariableLibNull/EncryptionVariableLibNull.uni
new file mode 100644
index 000000000000..856fa201b8df
--- /dev/null
+++ b/SecurityPkg/Library/EncryptionVariableLibNull/EncryptionVariableLibNull.uni
@@ -0,0 +1,16 @@
+// /** @file
+// Provides authenticated variable services.
+//
+// Provides authenticated variable services.
+//
+// Copyright (c) 2015 - 2022, Intel Corporation. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT             #language en-US "Provides authenticated variable services"
+
+#string STR_MODULE_DESCRIPTION          #language en-US "Provides authenticated variable services."
+
-- 
2.35.1.windows.2