/** @file
  EDKII System Capsule library.

  EDKII System Capsule library instance.

  CapsuleAuthenticateSystemFirmware(), ExtractAuthenticatedImage() will receive
  untrusted input and do basic validation.

  Copyright (c) 2016 - 2017, 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.

**/

#include <PiDxe.h>

#include <Guid/SystemResourceTable.h>
#include <Guid/FirmwareContentsSigned.h>
#include <Guid/WinCertificate.h>
#include <Guid/EdkiiSystemFmpCapsule.h>
#include <Guid/WinCertificate.h>
#include <Guid/ImageAuthentication.h>

#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/EdkiiSystemCapsuleLib.h>
#include <Library/FmpAuthenticationLib.h>

#include <Protocol/FirmwareManagement.h>

EDKII_SYSTEM_FIRMWARE_IMAGE_DESCRIPTOR   *mImageFmpInfo;
UINTN                                    mImageFmpInfoSize;
EFI_GUID                                 mEdkiiSystemFirmwareFileGuid;

/**
  Check if a block of buffer is erased.

  @param[in] ErasePolarity  Erase polarity attribute of the firmware volume
  @param[in] InBuffer       The buffer to be checked
  @param[in] BufferSize     Size of the buffer in bytes

  @retval    TRUE           The block of buffer is erased
  @retval    FALSE          The block of buffer is not erased
**/
BOOLEAN
IsBufferErased (
  IN UINT8    ErasePolarity,
  IN VOID     *InBuffer,
  IN UINTN    BufferSize
  )
{
  UINTN   Count;
  UINT8   EraseByte;
  UINT8   *Buffer;

  if(ErasePolarity == 1) {
    EraseByte = 0xFF;
  } else {
    EraseByte = 0;
  }

  Buffer = InBuffer;
  for (Count = 0; Count < BufferSize; Count++) {
    if (Buffer[Count] != EraseByte) {
      return FALSE;
    }
  }

  return TRUE;
}

/**
  Get Section buffer pointer by SectionType and SectionInstance.

  @param[in]   SectionBuffer     The buffer of section
  @param[in]   SectionBufferSize The size of SectionBuffer in bytes
  @param[in]   SectionType       The SectionType of Section to be found
  @param[in]   SectionInstance   The Instance of Section to be found
  @param[out]  OutSectionBuffer  The section found, including SECTION_HEADER
  @param[out]  OutSectionSize    The size of section found, including SECTION_HEADER

  @retval TRUE  The FFS buffer is found.
  @retval FALSE The FFS buffer is not found.
**/
BOOLEAN
GetSectionByType (
  IN VOID                  *SectionBuffer,
  IN UINT32                SectionBufferSize,
  IN EFI_SECTION_TYPE      SectionType,
  IN UINTN                 SectionInstance,
  OUT VOID                 **OutSectionBuffer,
  OUT UINTN                *OutSectionSize
  )
{
  EFI_COMMON_SECTION_HEADER             *SectionHeader;
  UINTN                                 SectionSize;
  UINTN                                 Instance;

  DEBUG ((DEBUG_INFO, "GetSectionByType - Buffer: 0x%08x - 0x%08x\n", SectionBuffer, SectionBufferSize));

  //
  // Find Section
  //
  SectionHeader = SectionBuffer;

  Instance = 0;
  while ((UINTN)SectionHeader < (UINTN)SectionBuffer + SectionBufferSize) {
    DEBUG ((DEBUG_INFO, "GetSectionByType - Section: 0x%08x\n", SectionHeader));
    if (IS_SECTION2(SectionHeader)) {
      SectionSize = SECTION2_SIZE(SectionHeader);
    } else {
      SectionSize = SECTION_SIZE(SectionHeader);
    }

    if (SectionHeader->Type == SectionType) {
      if (Instance == SectionInstance) {
        *OutSectionBuffer = (UINT8 *)SectionHeader;
        *OutSectionSize = SectionSize;
        DEBUG((DEBUG_INFO, "GetSectionByType - 0x%x - 0x%x\n", *OutSectionBuffer, *OutSectionSize));
        return TRUE;
      } else {
        DEBUG((DEBUG_INFO, "GetSectionByType - find section instance %x\n", Instance));
        Instance++;
      }
    } else {
      //
      // Skip other section type
      //
      DEBUG ((DEBUG_INFO, "GetSectionByType - other section type 0x%x\n", SectionHeader->Type));
    }

    //
    // Next Section
    //
    SectionHeader = (EFI_COMMON_SECTION_HEADER *)((UINTN)SectionHeader + ALIGN_VALUE(SectionSize, 4));
  }

  return FALSE;
}

/**
  Get FFS buffer pointer by FileName GUID and FileType.

  @param[in]   FdStart          The System Firmware FD image
  @param[in]   FdSize           The size of System Firmware FD image
  @param[in]   FileName         The FileName GUID of FFS to be found
  @param[in]   Type             The FileType of FFS to be found
  @param[out]  OutFfsBuffer     The FFS buffer found, including FFS_FILE_HEADER
  @param[out]  OutFfsBufferSize The size of FFS buffer found, including FFS_FILE_HEADER

  @retval TRUE  The FFS buffer is found.
  @retval FALSE The FFS buffer is not found.
**/
BOOLEAN
GetFfsByName (
  IN VOID                  *FdStart,
  IN UINTN                 FdSize,
  IN EFI_GUID              *FileName,
  IN EFI_FV_FILETYPE       Type,
  OUT VOID                 **OutFfsBuffer,
  OUT UINTN                *OutFfsBufferSize
  )
{
  UINTN                                     FvSize;
  EFI_FIRMWARE_VOLUME_HEADER                *FvHeader;
  EFI_FIRMWARE_VOLUME_EXT_HEADER            *FvExtHeader;
  EFI_FFS_FILE_HEADER                       *FfsHeader;
  UINT32                                    FfsSize;
  UINTN                                     TestLength;
  BOOLEAN                                   FvFound;

  DEBUG ((DEBUG_INFO, "GetFfsByName - FV: 0x%08x - 0x%08x\n", (UINTN)FdStart, (UINTN)FdSize));

  FvFound = FALSE;
  FvHeader = (EFI_FIRMWARE_VOLUME_HEADER *)FdStart;
  while ((UINTN)FvHeader < (UINTN)FdStart + FdSize - 1) {
    FvSize = (UINTN)FdStart + FdSize - (UINTN)FvHeader;

    if (FvHeader->Signature != EFI_FVH_SIGNATURE) {
      FvHeader = (EFI_FIRMWARE_VOLUME_HEADER *)((UINTN)FvHeader + SIZE_4KB);
      continue;
    }
    DEBUG((DEBUG_ERROR, "checking FV....0x%08x - 0x%x\n", FvHeader, FvHeader->FvLength));
    FvFound = TRUE;
    if (FvHeader->FvLength > FvSize) {
      DEBUG((DEBUG_ERROR, "GetFfsByName - FvSize: 0x%08x, MaxSize - 0x%08x\n", (UINTN)FvHeader->FvLength, (UINTN)FvSize));
      return FALSE;
    }
    FvSize = (UINTN)FvHeader->FvLength;

    //
    // Find FFS
    //
    if (FvHeader->ExtHeaderOffset != 0) {
      FvExtHeader = (EFI_FIRMWARE_VOLUME_EXT_HEADER *)((UINT8 *)FvHeader + FvHeader->ExtHeaderOffset);
      FfsHeader = (EFI_FFS_FILE_HEADER *)((UINT8 *)FvExtHeader + FvExtHeader->ExtHeaderSize);
    } else {
      FfsHeader = (EFI_FFS_FILE_HEADER *)((UINT8 *)FvHeader + FvHeader->HeaderLength);
    }
    FfsHeader = (EFI_FFS_FILE_HEADER *)((UINTN)FvHeader + ALIGN_VALUE((UINTN)FfsHeader - (UINTN)FvHeader, 8));

    while ((UINTN)FfsHeader < (UINTN)FvHeader + FvSize - 1) {
      DEBUG((DEBUG_INFO, "GetFfsByName - FFS: 0x%08x\n", FfsHeader));
      TestLength = (UINTN)((UINTN)FvHeader + FvSize - (UINTN)FfsHeader);
      if (TestLength > sizeof(EFI_FFS_FILE_HEADER)) {
        TestLength = sizeof(EFI_FFS_FILE_HEADER);
      }
      if (IsBufferErased(1, FfsHeader, TestLength)) {
        break;
      }

      if (IS_FFS_FILE2(FfsHeader)) {
        FfsSize = FFS_FILE2_SIZE(FfsHeader);
      } else {
        FfsSize = FFS_FILE_SIZE(FfsHeader);
      }

      if (CompareGuid(FileName, &FfsHeader->Name) &&
          ((Type == EFI_FV_FILETYPE_ALL) || (FfsHeader->Type == Type))) {
        //
        // Check section
        //
        *OutFfsBuffer = FfsHeader;
        *OutFfsBufferSize = FfsSize;
        return TRUE;
      } else {
        //
        // Any other type is not allowed
        //
        DEBUG((DEBUG_INFO, "GetFfsByName - other FFS type 0x%x, name %g\n", FfsHeader->Type, &FfsHeader->Name));
      }

      //
      // Next File
      //
      FfsHeader = (EFI_FFS_FILE_HEADER *)((UINTN)FfsHeader + ALIGN_VALUE(FfsSize, 8));
    }

    //
    // Next FV
    //
    FvHeader = (VOID *)(UINTN)((UINTN)FvHeader + FvHeader->FvLength);
    DEBUG((DEBUG_ERROR, "Next FV....0x%08x - 0x%x\n", FvHeader, FvHeader->FvLength));
  }

  if (!FvFound) {
    DEBUG((DEBUG_ERROR, "GetFfsByName - NO FV Found\n"));
  }
  return FALSE;
}

/**
  Extract the driver FV from an authenticated image.

  @param[in]  AuthenticatedImage      The authenticated capsule image.
  @param[in]  AuthenticatedImageSize  The size of the authenticated capsule image in bytes.
  @param[out] DriverFvImage           The driver FV image.
  @param[out] DriverFvImageSize       The size of the driver FV image in bytes.

  @retval TRUE  The driver Fv is extracted.
  @retval FALSE The driver Fv is not extracted.
**/
BOOLEAN
EFIAPI
ExtractDriverFvImage (
  IN VOID                         *AuthenticatedImage,
  IN UINTN                        AuthenticatedImageSize,
  OUT VOID                        **DriverFvImage,
  OUT UINTN                       *DriverFvImageSize
  )
{
  BOOLEAN     Result;
  UINT32      FileHeaderSize;

  *DriverFvImage = NULL;
  *DriverFvImageSize = 0;

  Result = GetFfsByName(AuthenticatedImage, AuthenticatedImageSize, &gEdkiiSystemFmpCapsuleDriverFvFileGuid, EFI_FV_FILETYPE_RAW, DriverFvImage, DriverFvImageSize);
  if (!Result) {
    return FALSE;
  }

  if (IS_FFS_FILE2(*DriverFvImage)) {
    FileHeaderSize = sizeof(EFI_FFS_FILE_HEADER2);
  } else {
    FileHeaderSize = sizeof(EFI_FFS_FILE_HEADER);
  }
  *DriverFvImage = (UINT8 *)*DriverFvImage + FileHeaderSize;
  *DriverFvImageSize = *DriverFvImageSize - FileHeaderSize;

  return Result;
}

/**
  Extract the config image from an authenticated image.

  @param[in]  AuthenticatedImage      The authenticated capsule image.
  @param[in]  AuthenticatedImageSize  The size of the authenticated capsule image in bytes.
  @param[out] ConfigImage             The config image.
  @param[out] ConfigImageSize         The size of the config image in bytes.

  @retval TRUE  The config image is extracted.
  @retval FALSE The config image is not extracted.
**/
BOOLEAN
EFIAPI
ExtractConfigImage (
  IN VOID                         *AuthenticatedImage,
  IN UINTN                        AuthenticatedImageSize,
  OUT VOID                        **ConfigImage,
  OUT UINTN                       *ConfigImageSize
  )
{
  BOOLEAN     Result;
  UINT32      FileHeaderSize;

  *ConfigImage = NULL;
  *ConfigImageSize = 0;

  Result = GetFfsByName(AuthenticatedImage, AuthenticatedImageSize, &gEdkiiSystemFmpCapsuleConfigFileGuid, EFI_FV_FILETYPE_RAW, ConfigImage, ConfigImageSize);
  if (!Result) {
    return FALSE;
  }

  if (IS_FFS_FILE2(*ConfigImage)) {
    FileHeaderSize = sizeof(EFI_FFS_FILE_HEADER2);
  } else {
    FileHeaderSize = sizeof(EFI_FFS_FILE_HEADER);
  }
  *ConfigImage = (UINT8 *)*ConfigImage + FileHeaderSize;
  *ConfigImageSize = *ConfigImageSize - FileHeaderSize;

  return Result;
}

/**
  Extract the authenticated image from an FMP capsule image.

  Caution: This function may receive untrusted input.

  @param[in]  Image                   The FMP capsule image, including EFI_FIRMWARE_IMAGE_AUTHENTICATION.
  @param[in]  ImageSize               The size of FMP capsule image in bytes.
  @param[out] LastAttemptStatus       The last attempt status, which will be recorded in ESRT and FMP EFI_FIRMWARE_IMAGE_DESCRIPTOR.
  @param[out] AuthenticatedImage      The authenticated capsule image, excluding EFI_FIRMWARE_IMAGE_AUTHENTICATION.
  @param[out] AuthenticatedImageSize  The size of the authenticated capsule image in bytes.

  @retval TRUE  The authenticated image is extracted.
  @retval FALSE The authenticated image is not extracted.
**/
BOOLEAN
EFIAPI
ExtractAuthenticatedImage (
  IN VOID                         *Image,
  IN UINTN                        ImageSize,
  OUT UINT32                      *LastAttemptStatus,
  OUT VOID                        **AuthenticatedImage,
  OUT UINTN                       *AuthenticatedImageSize
  )
{
  EFI_FIRMWARE_IMAGE_AUTHENTICATION         *ImageAuth;
  EFI_STATUS                                Status;
  GUID                                      *CertType;
  VOID                                      *PublicKeyData;
  UINTN                                     PublicKeyDataLength;

  DEBUG((DEBUG_INFO, "ExtractAuthenticatedImage - Image: 0x%08x - 0x%08x\n", (UINTN)Image, (UINTN)ImageSize));

  *LastAttemptStatus = LAST_ATTEMPT_STATUS_ERROR_INVALID_FORMAT;
  if ((Image == NULL) || (ImageSize == 0)) {
    return FALSE;
  }

  ImageAuth = (EFI_FIRMWARE_IMAGE_AUTHENTICATION *)Image;
  if (ImageSize < sizeof(EFI_FIRMWARE_IMAGE_AUTHENTICATION)) {
    DEBUG((DEBUG_ERROR, "ExtractAuthenticatedImage - ImageSize too small\n"));
    return FALSE;
  }
  if (ImageAuth->AuthInfo.Hdr.dwLength <= OFFSET_OF(WIN_CERTIFICATE_UEFI_GUID, CertData)) {
    DEBUG((DEBUG_ERROR, "ExtractAuthenticatedImage - dwLength too small\n"));
    return FALSE;
  }
  if ((UINTN) ImageAuth->AuthInfo.Hdr.dwLength > MAX_UINTN - sizeof(UINT64)) {
    DEBUG((DEBUG_ERROR, "ExtractAuthenticatedImage - dwLength too big\n"));
    return FALSE;
  }
  if (ImageSize <= sizeof(ImageAuth->MonotonicCount) + ImageAuth->AuthInfo.Hdr.dwLength) {
    DEBUG((DEBUG_ERROR, "ExtractAuthenticatedImage - ImageSize too small\n"));
    return FALSE;
  }
  if (ImageAuth->AuthInfo.Hdr.wRevision != 0x0200) {
    DEBUG((DEBUG_ERROR, "ExtractAuthenticatedImage - wRevision: 0x%02x, expect - 0x%02x\n", (UINTN)ImageAuth->AuthInfo.Hdr.wRevision, (UINTN)0x0200));
    return FALSE;
  }
  if (ImageAuth->AuthInfo.Hdr.wCertificateType != WIN_CERT_TYPE_EFI_GUID) {
    DEBUG((DEBUG_ERROR, "ExtractAuthenticatedImage - wCertificateType: 0x%02x, expect - 0x%02x\n", (UINTN)ImageAuth->AuthInfo.Hdr.wCertificateType, (UINTN)WIN_CERT_TYPE_EFI_GUID));
    return FALSE;
  }

  CertType = &ImageAuth->AuthInfo.CertType;
  DEBUG((DEBUG_INFO, "ExtractAuthenticatedImage - CertType: %g\n", CertType));

  if (CompareGuid(&gEfiCertPkcs7Guid, CertType)) {
    PublicKeyData   = PcdGetPtr(PcdPkcs7CertBuffer);
    PublicKeyDataLength = PcdGetSize(PcdPkcs7CertBuffer);
  } else if (CompareGuid(&gEfiCertTypeRsa2048Sha256Guid, CertType)) {
    PublicKeyData = PcdGetPtr(PcdRsa2048Sha256PublicKeyBuffer);
    PublicKeyDataLength = PcdGetSize(PcdRsa2048Sha256PublicKeyBuffer);
  } else {
    return FALSE;
  }
  ASSERT (PublicKeyData != NULL);
  ASSERT (PublicKeyDataLength != 0);

  Status = AuthenticateFmpImage(
             ImageAuth,
             ImageSize,
             PublicKeyData,
             PublicKeyDataLength
             );
  switch (Status) {
  case RETURN_SUCCESS:
    *LastAttemptStatus = LAST_ATTEMPT_STATUS_SUCCESS;
    break;
  case RETURN_SECURITY_VIOLATION:
    *LastAttemptStatus = LAST_ATTEMPT_STATUS_ERROR_AUTH_ERROR;
    break;
  case RETURN_INVALID_PARAMETER:
    *LastAttemptStatus = LAST_ATTEMPT_STATUS_ERROR_INVALID_FORMAT;
    break;
  case RETURN_UNSUPPORTED:
    *LastAttemptStatus = LAST_ATTEMPT_STATUS_ERROR_INVALID_FORMAT;
    break;
  case RETURN_OUT_OF_RESOURCES:
    *LastAttemptStatus = LAST_ATTEMPT_STATUS_ERROR_INSUFFICIENT_RESOURCES;
    break;
  default:
    *LastAttemptStatus = LAST_ATTEMPT_STATUS_ERROR_UNSUCCESSFUL;
    break;
  }
  if (EFI_ERROR(Status)) {
    return FALSE;
  }

  if (AuthenticatedImage != NULL) {
    *AuthenticatedImage = (UINT8 *)ImageAuth + ImageAuth->AuthInfo.Hdr.dwLength + sizeof(ImageAuth->MonotonicCount);
  }
  if (AuthenticatedImageSize != NULL) {
    *AuthenticatedImageSize = ImageSize - ImageAuth->AuthInfo.Hdr.dwLength - sizeof(ImageAuth->MonotonicCount);
  }
  return TRUE;
}

/**
  Extract ImageFmpInfo from system firmware.

  @param[in]  SystemFirmwareImage     The System Firmware image.
  @param[in]  SystemFirmwareImageSize The size of the System Firmware image in bytes.
  @param[out] ImageFmpInfo            The ImageFmpInfo.
  @param[out] ImageFmpInfoSize        The size of the ImageFmpInfo in bytes.

  @retval TRUE  The ImageFmpInfo is extracted.
  @retval FALSE The ImageFmpInfo is not extracted.
**/
BOOLEAN
EFIAPI
ExtractSystemFirmwareImageFmpInfo (
  IN VOID                                      *SystemFirmwareImage,
  IN UINTN                                     SystemFirmwareImageSize,
  OUT EDKII_SYSTEM_FIRMWARE_IMAGE_DESCRIPTOR   **ImageFmpInfo,
  OUT UINTN                                    *ImageFmpInfoSize
  )
{
  BOOLEAN     Result;
  UINT32      SectionHeaderSize;
  UINT32      FileHeaderSize;

  *ImageFmpInfo = NULL;
  *ImageFmpInfoSize = 0;

  Result = GetFfsByName(SystemFirmwareImage, SystemFirmwareImageSize, &gEdkiiSystemFirmwareImageDescriptorFileGuid, EFI_FV_FILETYPE_ALL, (VOID **)ImageFmpInfo, ImageFmpInfoSize);
  if (!Result) {
    return FALSE;
  }
  if (IS_FFS_FILE2 (*ImageFmpInfo)) {
    FileHeaderSize = sizeof(EFI_FFS_FILE_HEADER2);
  } else {
    FileHeaderSize = sizeof(EFI_FFS_FILE_HEADER);
  }
  *ImageFmpInfo = (VOID *)((UINT8 *)*ImageFmpInfo + FileHeaderSize);
  *ImageFmpInfoSize = *ImageFmpInfoSize - FileHeaderSize;

  Result = GetSectionByType(*ImageFmpInfo, (UINT32)*ImageFmpInfoSize, EFI_SECTION_RAW, 0, (VOID **)ImageFmpInfo, ImageFmpInfoSize);
  if (!Result) {
    return FALSE;
  }
  if (IS_SECTION2(*ImageFmpInfo)) {
    SectionHeaderSize = sizeof(EFI_RAW_SECTION2);
  } else {
    SectionHeaderSize = sizeof(EFI_RAW_SECTION);
  }
  *ImageFmpInfo = (VOID *)((UINT8 *)*ImageFmpInfo + SectionHeaderSize);
  *ImageFmpInfoSize = *ImageFmpInfoSize - SectionHeaderSize;

  return TRUE;
}

/**
  Extract the System Firmware image from an authenticated image.

  @param[in]  AuthenticatedImage      The authenticated capsule image.
  @param[in]  AuthenticatedImageSize  The size of the authenticated capsule image in bytes.
  @param[out] SystemFirmwareImage     The System Firmware image.
  @param[out] SystemFirmwareImageSize The size of the System Firmware image in bytes.

  @retval TRUE  The System Firmware image is extracted.
  @retval FALSE The System Firmware image is not extracted.
**/
BOOLEAN
EFIAPI
ExtractSystemFirmwareImage (
  IN VOID                         *AuthenticatedImage,
  IN UINTN                        AuthenticatedImageSize,
  OUT VOID                        **SystemFirmwareImage,
  OUT UINTN                       *SystemFirmwareImageSize
  )
{
  BOOLEAN     Result;
  UINT32      FileHeaderSize;

  *SystemFirmwareImage = NULL;
  *SystemFirmwareImageSize = 0;

  Result = GetFfsByName(AuthenticatedImage, AuthenticatedImageSize, &mEdkiiSystemFirmwareFileGuid, EFI_FV_FILETYPE_RAW, SystemFirmwareImage, SystemFirmwareImageSize);
  if (!Result) {
    // no nested FV, just return all data.
    *SystemFirmwareImage = AuthenticatedImage;
    *SystemFirmwareImageSize = AuthenticatedImageSize;

    return TRUE;
  }
  if (IS_FFS_FILE2 (*SystemFirmwareImage)) {
    FileHeaderSize = sizeof(EFI_FFS_FILE_HEADER2);
  } else {
    FileHeaderSize = sizeof(EFI_FFS_FILE_HEADER);
  }
  *SystemFirmwareImage = (UINT8 *)*SystemFirmwareImage + FileHeaderSize;
  *SystemFirmwareImageSize = *SystemFirmwareImageSize - FileHeaderSize;

  return Result;
}

/**
  Authenticated system firmware FMP capsule image.

  Caution: This function may receive untrusted input.

  @param[in]  Image                   The FMP capsule image, including EFI_FIRMWARE_IMAGE_AUTHENTICATION.
  @param[in]  ImageSize               The size of FMP capsule image in bytes.
  @param[in]  ForceVersionMatch       TRUE: The version of capsule must be as same as the version of current image.
                                      FALSE: The version of capsule must be as same as greater than the lowest
                                             supported version of current image.
  @param[out] LastAttemptVersion      The last attempt version, which will be recorded in ESRT and FMP EFI_FIRMWARE_IMAGE_DESCRIPTOR.
  @param[out] LastAttemptStatus       The last attempt status, which will be recorded in ESRT and FMP EFI_FIRMWARE_IMAGE_DESCRIPTOR.
  @param[out] AuthenticatedImage      The authenticated capsule image, excluding EFI_FIRMWARE_IMAGE_AUTHENTICATION.
  @param[out] AuthenticatedImageSize  The size of the authenticated capsule image in bytes.

  @retval TRUE  Authentication passes and the authenticated image is extracted.
  @retval FALSE Authentication fails and the authenticated image is not extracted.
**/
EFI_STATUS
EFIAPI
CapsuleAuthenticateSystemFirmware (
  IN VOID                         *Image,
  IN UINTN                        ImageSize,
  IN BOOLEAN                      ForceVersionMatch,
  OUT UINT32                      *LastAttemptVersion,
  OUT UINT32                      *LastAttemptStatus,
  OUT VOID                        **AuthenticatedImage,
  OUT UINTN                       *AuthenticatedImageSize
  )
{
  BOOLEAN                                  Result;
  EDKII_SYSTEM_FIRMWARE_IMAGE_DESCRIPTOR   *ImageFmpInfo;
  UINTN                                    ImageFmpInfoSize;
  EDKII_SYSTEM_FIRMWARE_IMAGE_DESCRIPTOR   *CurrentImageFmpInfo;
  UINTN                                    CurrentImageFmpInfoSize;
  VOID                                     *SystemFirmwareImage;
  UINTN                                    SystemFirmwareImageSize;

  *LastAttemptVersion = 0;

  //
  // NOTE: This function need run in an isolated environment.
  // Do not touch FMP protocol and its private structure.
  //

  Result = ExtractAuthenticatedImage((VOID *)Image, ImageSize, LastAttemptStatus, AuthenticatedImage, AuthenticatedImageSize);
  if (!Result) {
    DEBUG((DEBUG_INFO, "ExtractAuthenticatedImage - fail\n"));
    return EFI_SECURITY_VIOLATION;
  }

  DEBUG((DEBUG_INFO, "AuthenticatedImage - 0x%x - 0x%x\n", *AuthenticatedImage, *AuthenticatedImageSize));

  Result = ExtractSystemFirmwareImage(*AuthenticatedImage, *AuthenticatedImageSize, &SystemFirmwareImage, &SystemFirmwareImageSize);
  if (!Result) {
    *LastAttemptStatus = LAST_ATTEMPT_STATUS_ERROR_INVALID_FORMAT;
    DEBUG((DEBUG_INFO, "ExtractSystemFirmwareImage - fail\n"));
    return EFI_SECURITY_VIOLATION;
  }
  DEBUG((DEBUG_INFO, "SystemFirmwareImage - 0x%x - 0x%x\n", SystemFirmwareImage, SystemFirmwareImageSize));

  Result = ExtractSystemFirmwareImageFmpInfo(SystemFirmwareImage, SystemFirmwareImageSize, &ImageFmpInfo, &ImageFmpInfoSize);
  if (!Result) {
    *LastAttemptStatus = LAST_ATTEMPT_STATUS_ERROR_INVALID_FORMAT;
    DEBUG((DEBUG_INFO, "ExtractSystemFirmwareImageFmpInfo - fail\n"));
    return EFI_SECURITY_VIOLATION;
  }

  *LastAttemptVersion = ImageFmpInfo->Version;
  DEBUG((DEBUG_INFO, "ImageFmpInfo - 0x%x - 0x%x\n", ImageFmpInfo, ImageFmpInfoSize));
  DEBUG((DEBUG_INFO, "NewImage Version - 0x%x\n", ImageFmpInfo->Version));
  DEBUG((DEBUG_INFO, "NewImage LowestSupportedImageVersion - 0x%x\n", ImageFmpInfo->LowestSupportedImageVersion));

  CurrentImageFmpInfo = mImageFmpInfo;
  CurrentImageFmpInfoSize = mImageFmpInfoSize;

  DEBUG((DEBUG_INFO, "ImageFmpInfo - 0x%x - 0x%x\n", CurrentImageFmpInfo, CurrentImageFmpInfoSize));
  DEBUG((DEBUG_INFO, "Current Version - 0x%x\n", CurrentImageFmpInfo->Version));
  DEBUG((DEBUG_INFO, "Current LowestSupportedImageVersion - 0x%x\n", CurrentImageFmpInfo->LowestSupportedImageVersion));

  if (ForceVersionMatch) {
    if (CurrentImageFmpInfo->Version != ImageFmpInfo->Version) {
      *LastAttemptStatus = LAST_ATTEMPT_STATUS_ERROR_INCORRECT_VERSION;
      DEBUG((DEBUG_INFO, "ForceVersionMatch check - fail\n"));
      return EFI_SECURITY_VIOLATION;
    }
  } else {
    if (ImageFmpInfo->Version < CurrentImageFmpInfo->LowestSupportedImageVersion) {
      *LastAttemptStatus = LAST_ATTEMPT_STATUS_ERROR_INCORRECT_VERSION;
      DEBUG((DEBUG_INFO, "LowestSupportedImageVersion check - fail\n"));
      return EFI_SECURITY_VIOLATION;
    }
  }

  *LastAttemptStatus = LAST_ATTEMPT_STATUS_SUCCESS;
  return EFI_SUCCESS;
}

/**
  The constructor function.

  @retval EFI_SUCCESS   The constructor successfully .
**/
EFI_STATUS
EFIAPI
EdkiiSystemCapsuleLibConstructor (
  VOID
  )
{
  mImageFmpInfoSize = PcdGetSize(PcdEdkiiSystemFirmwareImageDescriptor);
  mImageFmpInfo = AllocateCopyPool (mImageFmpInfoSize, PcdGetPtr(PcdEdkiiSystemFirmwareImageDescriptor));
  ASSERT(mImageFmpInfo != NULL);
  CopyGuid(&mEdkiiSystemFirmwareFileGuid, PcdGetPtr(PcdEdkiiSystemFirmwareFileGuid));
  return EFI_SUCCESS;
}