diff --git a/libstb/secvar/backend/edk2/edk2.h b/libstb/secvar/backend/edk2/edk2.h
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+/* Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved. This
+ * program and the accompanying materials are licensed and made available
+ * under the terms and conditions of the 2-Clause BSD License which
+ * accompanies this distribution.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This file is derived from the following files referred from edk2-staging[1] repo
+ * of tianocore
+ *
+ * MdePkg/Include/Guid/GlobalVariable.h
+ * MdePkg/Include/Guid/WinCertificate.h
+ * MdePkg/Include/Uefi/UefiMultiPhase.h
+ * MdePkg/Include/Uefi/UefiBaseType.h
+ * MdePkg/Include/Guid/ImageAuthentication.h
+ *
+ * [1] https://github.com/tianocore/edk2-staging
+ *
+ * Copyright 2019 IBM Corp.
+ */
+
+#ifndef __EDK2_H__
+#define __EDK2_H__
+
+#define EFI_GLOBAL_VARIABLE \
+  { \
+    0x8B, 0xE4, 0xDF, 0x61, 0x93, 0xCA, 0x11, 0xd2, 0xAA, 0x0D, 0x00, 0xE0, 0x98, 0x03, 0x2B, 0x8C \
+  }
+
+
+///
+/// This identifies a signature based on an X.509 certificate. If the signature is an X.509
+/// certificate then verification of the signature of an image should validate the public
+/// key certificate in the image using certificate path verification, up to this X.509
+/// certificate as a trusted root.  The SignatureHeader size shall always be 0. The
+/// SignatureSize may vary but shall always be 16 (size of the SignatureOwner component) +
+/// the size of the certificate itself.
+/// Note: This means that each certificate will normally be in a separate EFI_SIGNATURE_LIST.
+///
+#define EFI_CERT_X509_GUID \
+  { \
+    0xa5, 0xc0, 0x59, 0xa1, 0x94, 0xe4, 0x4a, 0xa7, 0x87, 0xb5, 0xab, 0x15, 0x5c, 0x2b, 0xf0, 0x72 \
+  }
+
+#define EFI_CERT_TYPE_PKCS7_GUID \
+  { \
+    0x4a, 0xaf, 0xd2, 0x9d, 0x68, 0xdf, 0x49, 0xee, 0x8a, 0xa9, 0x34, 0x7d, 0x37, 0x56, 0x65, 0xa7 \
+  }
+
+#define EFI_VARIABLE_NON_VOLATILE				0x00000001
+#define EFI_VARIABLE_BOOTSERVICE_ACCESS				0x00000002
+#define EFI_VARIABLE_RUNTIME_ACCESS				0x00000004
+/*
+ * This attribute is identified by the mnemonic 'HR' elsewhere in this
+ * specification.
+ */
+#define EFI_VARIABLE_HARDWARE_ERROR_RECORD			0x00000008
+/*
+ * Attributes of Authenticated Variable
+ */
+#define EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS	0x00000020
+#define EFI_VARIABLE_APPEND_WRITE				0x00000040
+/*
+ * NOTE: EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS is deprecated and should be
+ * considered reserved.
+ */
+#define EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS			0x00000010
+
+/*
+ * win_certificate.w_certificate_type
+ */
+#define WIN_CERT_TYPE_PKCS_SIGNED_DATA	0x0002
+
+#define SECURE_BOOT_MODE_ENABLE           1
+#define SECURE_BOOT_MODE_DISABLE          0
+///
+/// Depricated value definition for SetupMode variable
+///
+#define SETUP_MODE                        1
+#define USER_MODE                         0
+
+struct efi_guid {
+	u32 data1;
+	u16 data2;
+	u16 data3;
+	u8  data4[8];
+};
+
+/*
+ * EFI Time Abstraction:
+ *   Year:       1900 - 9999
+ *   Month:      1 - 12
+ *   Day:        1 - 31
+ *   Hour:       0 - 23
+ *   Minute:     0 - 59
+ *   Second:     0 - 59
+ *   Nanosecond: 0 - 999,999,999
+ *   TimeZone:   -1440 to 1440 or 2047
+ */
+struct efi_time {
+	u16 year;
+	u8 month;
+	u8 day;
+	u8 hour;
+	u8 minute;
+	u8 second;
+	u8 pad1;
+	u32 nanosecond;
+	s16 timezone;
+	u8 daylight;
+	u8 pad2;
+};
+//***********************************************************************
+// Signature Database
+//***********************************************************************
+///
+/// The format of a signature database.
+///
+#pragma pack(1)
+
+typedef struct {
+  ///
+  /// An identifier which identifies the agent which added the signature to the list.
+  ///
+  struct efi_guid SignatureOwner;
+  ///
+  /// The format of the signature is defined by the SignatureType.
+  ///
+  unsigned char SignatureData[1];
+} EFI_SIGNATURE_DATA;
+
+typedef struct {
+  ///
+  /// Type of the signature. GUID signature types are defined in below.
+  ///
+  struct efi_guid	SignatureType;
+  ///
+  /// Total size of the signature list, including this header.
+  ///
+  uint32_t	SignatureListSize;
+  ///
+  /// Size of the signature header which precedes the array of signatures.
+  ///
+  uint32_t	SignatureHeaderSize;
+  ///
+  /// Size of each signature.
+  ///
+  uint32_t	SignatureSize;
+  ///
+  /// Header before the array of signatures. The format of this header is specified
+  /// by the SignatureType.
+  /// UINT8           SignatureHeader[SignatureHeaderSize];
+  ///
+  /// An array of signatures. Each signature is SignatureSize bytes in length.
+  /// EFI_SIGNATURE_DATA Signatures[][SignatureSize];
+  ///
+} EFI_SIGNATURE_LIST;
+
+
+/*
+ * The win_certificate structure is part of the PE/COFF specification.
+ */
+struct win_certificate {
+	/*
+	 * The length of the entire certificate, including the length of the
+	 * header, in bytes.
+	 */
+	u32  dw_length;
+	/*
+	 * The revision level of the WIN_CERTIFICATE structure. The current
+	 * revision level is 0x0200.
+	 */
+	u16  w_revision;
+	/*
+	 * The certificate type. See WIN_CERT_TYPE_xxx for the UEFI certificate
+	 * types. The UEFI specification reserves the range of certificate type
+	 * values from 0x0EF0 to 0x0EFF.
+	 */
+	u16  w_certificate_type;
+	/*
+	 * The following is the actual certificate. The format of
+	 * the certificate depends on wCertificateType.
+	 */
+	/// UINT8 bCertificate[ANYSIZE_ARRAY];
+};
+
+/*
+ * Certificate which encapsulates a GUID-specific digital signature
+ */
+struct win_certificate_uefi_guid {
+	/*
+	 * This is the standard win_certificate header, where w_certificate_type
+	 * is set to WIN_CERT_TYPE_EFI_GUID.
+	 */
+	struct win_certificate hdr;
+	/*
+	 * This is the unique id which determines the format of the cert_data.
+	 */
+	struct efi_guid cert_type;
+	/*
+	 * The following is the certificate data. The format of the data is
+	 * determined by the @cert_type. If @cert_type is
+	 * EFI_CERT_TYPE_RSA2048_SHA256_GUID, the @cert_data will be
+	 * EFI_CERT_BLOCK_RSA_2048_SHA256 structure.
+	 */
+	u8 cert_data[1];
+};
+/*
+ * When the attribute EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS is set,
+ * then the Data buffer shall begin with an instance of a complete (and
+ * serialized) EFI_VARIABLE_AUTHENTICATION_2 descriptor. The descriptor shall be
+ * followed by the new variable value and DataSize shall reflect the combined
+ * size of the descriptor and the new variable value. The authentication
+ * descriptor is not part of the variable data and is not returned by subsequent
+ * calls to GetVariable().
+ */
+struct efi_variable_authentication_2 {
+	/*
+	 * For the TimeStamp value, components Pad1, Nanosecond, TimeZone, Daylight and
+	 * Pad2 shall be set to 0. This means that the time shall always be expressed in GMT.
+	 */
+	struct efi_time timestamp;
+	/*
+	 * Only a CertType of  EFI_CERT_TYPE_PKCS7_GUID is accepted.
+	 */
+	struct win_certificate_uefi_guid auth_info;
+};
+
+#endif
