/** @file
  Implement TPM2 NVStorage related command.

Copyright (c) 2013 - 2024, Intel Corporation. All rights reserved. <BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include <IndustryStandard/UefiTcgPlatform.h>
#include <Library/Tpm2CommandLib.h>
#include <Library/Tpm2DeviceLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>

#pragma pack(1)

#define RC_NV_ReadPublic_nvIndex  (TPM_RC_H + TPM_RC_1)

#define RC_NV_DefineSpace_authHandle  (TPM_RC_H + TPM_RC_1)
#define RC_NV_DefineSpace_auth        (TPM_RC_P + TPM_RC_1)
#define RC_NV_DefineSpace_publicInfo  (TPM_RC_P + TPM_RC_2)

#define RC_NV_UndefineSpace_authHandle  (TPM_RC_H + TPM_RC_1)
#define RC_NV_UndefineSpace_nvIndex     (TPM_RC_H + TPM_RC_2)

#define RC_NV_Read_authHandle  (TPM_RC_H + TPM_RC_1)
#define RC_NV_Read_nvIndex     (TPM_RC_H + TPM_RC_2)
#define RC_NV_Read_size        (TPM_RC_P + TPM_RC_1)
#define RC_NV_Read_offset      (TPM_RC_P + TPM_RC_2)

#define RC_NV_Write_authHandle  (TPM_RC_H + TPM_RC_1)
#define RC_NV_Write_nvIndex     (TPM_RC_H + TPM_RC_2)
#define RC_NV_Write_data        (TPM_RC_P + TPM_RC_1)
#define RC_NV_Write_offset      (TPM_RC_P + TPM_RC_2)

typedef struct {
  TPM2_COMMAND_HEADER    Header;
  TPMI_RH_NV_INDEX       NvIndex;
} TPM2_NV_READPUBLIC_COMMAND;

typedef struct {
  TPM2_RESPONSE_HEADER    Header;
  TPM2B_NV_PUBLIC         NvPublic;
  TPM2B_NAME              NvName;
} TPM2_NV_READPUBLIC_RESPONSE;

typedef struct {
  TPM2_COMMAND_HEADER    Header;
  TPMI_RH_PROVISION      AuthHandle;
  UINT32                 AuthSessionSize;
  TPMS_AUTH_COMMAND      AuthSession;
  TPM2B_AUTH             Auth;
  TPM2B_NV_PUBLIC        NvPublic;
} TPM2_NV_DEFINESPACE_COMMAND;

typedef struct {
  TPM2_RESPONSE_HEADER    Header;
  UINT32                  AuthSessionSize;
  TPMS_AUTH_RESPONSE      AuthSession;
} TPM2_NV_DEFINESPACE_RESPONSE;

typedef struct {
  TPM2_COMMAND_HEADER    Header;
  TPMI_RH_PROVISION      AuthHandle;
  TPMI_RH_NV_INDEX       NvIndex;
  UINT32                 AuthSessionSize;
  TPMS_AUTH_COMMAND      AuthSession;
} TPM2_NV_UNDEFINESPACE_COMMAND;

typedef struct {
  TPM2_RESPONSE_HEADER    Header;
  UINT32                  AuthSessionSize;
  TPMS_AUTH_RESPONSE      AuthSession;
} TPM2_NV_UNDEFINESPACE_RESPONSE;

typedef struct {
  TPM2_COMMAND_HEADER    Header;
  TPMI_RH_NV_AUTH        AuthHandle;
  TPMI_RH_NV_INDEX       NvIndex;
  UINT32                 AuthSessionSize;
  TPMS_AUTH_COMMAND      AuthSession;
  UINT16                 Size;
  UINT16                 Offset;
} TPM2_NV_READ_COMMAND;

typedef struct {
  TPM2_RESPONSE_HEADER    Header;
  UINT32                  AuthSessionSize;
  TPM2B_MAX_BUFFER        Data;
  TPMS_AUTH_RESPONSE      AuthSession;
} TPM2_NV_READ_RESPONSE;

typedef struct {
  TPM2_COMMAND_HEADER    Header;
  TPMI_RH_NV_AUTH        AuthHandle;
  TPMI_RH_NV_INDEX       NvIndex;
  UINT32                 AuthSessionSize;
  TPMS_AUTH_COMMAND      AuthSession;
  TPM2B_MAX_BUFFER       Data;
  UINT16                 Offset;
} TPM2_NV_WRITE_COMMAND;

typedef struct {
  TPM2_RESPONSE_HEADER    Header;
  UINT32                  AuthSessionSize;
  TPMS_AUTH_RESPONSE      AuthSession;
} TPM2_NV_WRITE_RESPONSE;

typedef struct {
  TPM2_COMMAND_HEADER    Header;
  TPMI_RH_NV_AUTH        AuthHandle;
  TPMI_RH_NV_INDEX       NvIndex;
  UINT32                 AuthSessionSize;
  TPMS_AUTH_COMMAND      AuthSession;
} TPM2_NV_READLOCK_COMMAND;

typedef struct {
  TPM2_RESPONSE_HEADER    Header;
  UINT32                  AuthSessionSize;
  TPMS_AUTH_RESPONSE      AuthSession;
} TPM2_NV_READLOCK_RESPONSE;

typedef struct {
  TPM2_COMMAND_HEADER    Header;
  TPMI_RH_NV_AUTH        AuthHandle;
  TPMI_RH_NV_INDEX       NvIndex;
  UINT32                 AuthSessionSize;
  TPMS_AUTH_COMMAND      AuthSession;
} TPM2_NV_WRITELOCK_COMMAND;

typedef struct {
  TPM2_RESPONSE_HEADER    Header;
  UINT32                  AuthSessionSize;
  TPMS_AUTH_RESPONSE      AuthSession;
} TPM2_NV_WRITELOCK_RESPONSE;

typedef struct {
  TPM2_COMMAND_HEADER    Header;
  TPMI_RH_PROVISION      AuthHandle;
  UINT32                 AuthSessionSize;
  TPMS_AUTH_COMMAND      AuthSession;
} TPM2_NV_GLOBALWRITELOCK_COMMAND;

typedef struct {
  TPM2_RESPONSE_HEADER    Header;
  UINT32                  AuthSessionSize;
  TPMS_AUTH_RESPONSE      AuthSession;
} TPM2_NV_GLOBALWRITELOCK_RESPONSE;

typedef struct {
  TPM2_COMMAND_HEADER    Header;
  TPMI_RH_NV_AUTH        AuthHandle;
  TPMI_RH_NV_INDEX       NvIndex;
  UINT32                 AuthSessionSize;
  TPMS_AUTH_COMMAND      AuthSession;
  TPM2B_MAX_BUFFER       Data;
  UINT16                 Offset;
} TPM2_NV_EXTEND_COMMAND;

typedef struct {
  TPM2_RESPONSE_HEADER    Header;
  UINT32                  AuthSessionSize;
  TPMS_AUTH_RESPONSE      AuthSession;
} TPM2_NV_EXTEND_RESPONSE;

#pragma pack()

/**
  This command is used to read the public area and Name of an NV Index.

  @param[in]  NvIndex            The NV Index.
  @param[out] NvPublic           The public area of the index.
  @param[out] NvName             The Name of the nvIndex.

  @retval EFI_SUCCESS            Operation completed successfully.
  @retval EFI_DEVICE_ERROR       The command was unsuccessful.
  @retval EFI_NOT_FOUND          The command was returned successfully, but NvIndex is not found.
**/
EFI_STATUS
EFIAPI
Tpm2NvReadPublic (
  IN      TPMI_RH_NV_INDEX  NvIndex,
  OUT     TPM2B_NV_PUBLIC   *NvPublic,
  OUT     TPM2B_NAME        *NvName
  )
{
  EFI_STATUS                   Status;
  TPM2_NV_READPUBLIC_COMMAND   SendBuffer;
  TPM2_NV_READPUBLIC_RESPONSE  RecvBuffer;
  UINT32                       SendBufferSize;
  UINT32                       RecvBufferSize;
  UINT16                       NvPublicSize;
  UINT16                       NvNameSize;
  UINT8                        *Buffer;
  TPM_RC                       ResponseCode;

  //
  // Construct command
  //
  SendBuffer.Header.tag         = SwapBytes16 (TPM_ST_NO_SESSIONS);
  SendBuffer.Header.commandCode = SwapBytes32 (TPM_CC_NV_ReadPublic);

  SendBuffer.NvIndex = SwapBytes32 (NvIndex);

  SendBufferSize              = (UINT32)sizeof (SendBuffer);
  SendBuffer.Header.paramSize = SwapBytes32 (SendBufferSize);

  //
  // send Tpm command
  //
  RecvBufferSize = sizeof (RecvBuffer);
  Status         = Tpm2SubmitCommand (SendBufferSize, (UINT8 *)&SendBuffer, &RecvBufferSize, (UINT8 *)&RecvBuffer);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  if (RecvBufferSize < sizeof (TPM2_RESPONSE_HEADER)) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvReadPublic - RecvBufferSize Error - %x\n", RecvBufferSize));
    return EFI_DEVICE_ERROR;
  }

  ResponseCode = SwapBytes32 (RecvBuffer.Header.responseCode);
  if (ResponseCode != TPM_RC_SUCCESS) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvReadPublic - responseCode - %x\n", SwapBytes32 (RecvBuffer.Header.responseCode)));
  }

  switch (ResponseCode) {
    case TPM_RC_SUCCESS:
      // return data
      break;
    case TPM_RC_HANDLE:
    case TPM_RC_HANDLE + RC_NV_ReadPublic_nvIndex: // TPM_RC_NV_DEFINED:
      return EFI_NOT_FOUND;
    case TPM_RC_VALUE + RC_NV_ReadPublic_nvIndex:
      return EFI_INVALID_PARAMETER;
    default:
      return EFI_DEVICE_ERROR;
  }

  if (RecvBufferSize <= sizeof (TPM2_RESPONSE_HEADER) + sizeof (UINT16) + sizeof (UINT16)) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvReadPublic - RecvBufferSize Error - %x\n", RecvBufferSize));
    return EFI_NOT_FOUND;
  }

  //
  // Basic check
  //
  NvPublicSize = SwapBytes16 (RecvBuffer.NvPublic.size);
  if (NvPublicSize > sizeof (TPMS_NV_PUBLIC)) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvReadPublic - NvPublic.size error %x\n", NvPublicSize));
    return EFI_DEVICE_ERROR;
  }

  NvNameSize = SwapBytes16 (ReadUnaligned16 ((UINT16 *)((UINT8 *)&RecvBuffer + sizeof (TPM2_RESPONSE_HEADER) + sizeof (UINT16) + NvPublicSize)));
  if (NvNameSize > sizeof (TPMU_NAME)) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvReadPublic - NvNameSize error %x\n", NvNameSize));
    return EFI_DEVICE_ERROR;
  }

  if (RecvBufferSize != sizeof (TPM2_RESPONSE_HEADER) + sizeof (UINT16) + NvPublicSize + sizeof (UINT16) + NvNameSize) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvReadPublic - RecvBufferSize Error - NvPublicSize %x\n", RecvBufferSize));
    return EFI_NOT_FOUND;
  }

  //
  // Return the response
  //
  CopyMem (NvPublic, &RecvBuffer.NvPublic, sizeof (UINT16) + NvPublicSize);
  NvPublic->size             = NvPublicSize;
  NvPublic->nvPublic.nvIndex = SwapBytes32 (NvPublic->nvPublic.nvIndex);
  NvPublic->nvPublic.nameAlg = SwapBytes16 (NvPublic->nvPublic.nameAlg);
  WriteUnaligned32 ((UINT32 *)&NvPublic->nvPublic.attributes, SwapBytes32 (ReadUnaligned32 ((UINT32 *)&NvPublic->nvPublic.attributes)));
  NvPublic->nvPublic.authPolicy.size = SwapBytes16 (NvPublic->nvPublic.authPolicy.size);
  Buffer                             = (UINT8 *)&RecvBuffer.NvPublic.nvPublic.authPolicy;
  Buffer                            += sizeof (UINT16) + NvPublic->nvPublic.authPolicy.size;
  NvPublic->nvPublic.dataSize        = SwapBytes16 (ReadUnaligned16 ((UINT16 *)Buffer));

  CopyMem (NvName->name, (UINT8 *)&RecvBuffer + sizeof (TPM2_RESPONSE_HEADER) + sizeof (UINT16) + NvPublicSize + sizeof (UINT16), NvNameSize);
  NvName->size = NvNameSize;

  return EFI_SUCCESS;
}

/**
  This command defines the attributes of an NV Index and causes the TPM to
  reserve space to hold the data associated with the index.
  If a definition already exists at the index, the TPM will return TPM_RC_NV_DEFINED.

  @param[in]  AuthHandle         TPM_RH_OWNER or TPM_RH_PLATFORM+{PP}.
  @param[in]  AuthSession        Auth Session context
  @param[in]  Auth               The authorization data.
  @param[in]  NvPublic           The public area of the index.

  @retval EFI_SUCCESS            Operation completed successfully.
  @retval EFI_DEVICE_ERROR       The command was unsuccessful.
  @retval EFI_ALREADY_STARTED    The command was returned successfully, but NvIndex is already defined.
**/
EFI_STATUS
EFIAPI
Tpm2NvDefineSpace (
  IN      TPMI_RH_PROVISION  AuthHandle,
  IN      TPMS_AUTH_COMMAND  *AuthSession  OPTIONAL,
  IN      TPM2B_AUTH         *Auth,
  IN      TPM2B_NV_PUBLIC    *NvPublic
  )
{
  EFI_STATUS                    Status;
  TPM2_NV_DEFINESPACE_COMMAND   SendBuffer;
  TPM2_NV_DEFINESPACE_RESPONSE  RecvBuffer;
  UINT32                        SendBufferSize;
  UINT32                        RecvBufferSize;
  UINT16                        NvPublicSize;
  UINT8                         *Buffer;
  UINT32                        SessionInfoSize;
  TPM_RC                        ResponseCode;

  //
  // Construct command
  //
  SendBuffer.Header.tag         = SwapBytes16 (TPM_ST_SESSIONS);
  SendBuffer.Header.commandCode = SwapBytes32 (TPM_CC_NV_DefineSpace);
  SendBuffer.AuthHandle         = SwapBytes32 (AuthHandle);

  //
  // Add in Auth session
  //
  Buffer = (UINT8 *)&SendBuffer.AuthSession;

  // sessionInfoSize
  SessionInfoSize            = CopyAuthSessionCommand (AuthSession, Buffer);
  Buffer                    += SessionInfoSize;
  SendBuffer.AuthSessionSize = SwapBytes32 (SessionInfoSize);

  //
  // IndexAuth
  //
  WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Auth->size));
  Buffer += sizeof (UINT16);
  CopyMem (Buffer, Auth->buffer, Auth->size);
  Buffer += Auth->size;

  //
  // NvPublic
  //
  NvPublicSize = NvPublic->size;

  WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (NvPublicSize));
  Buffer += sizeof (UINT16);
  WriteUnaligned32 ((UINT32 *)Buffer, SwapBytes32 (NvPublic->nvPublic.nvIndex));
  Buffer += sizeof (UINT32);
  WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (NvPublic->nvPublic.nameAlg));
  Buffer += sizeof (UINT16);
  WriteUnaligned32 ((UINT32 *)Buffer, SwapBytes32 (ReadUnaligned32 ((UINT32 *)&NvPublic->nvPublic.attributes)));
  Buffer += sizeof (UINT32);
  WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (NvPublic->nvPublic.authPolicy.size));
  Buffer += sizeof (UINT16);
  CopyMem (Buffer, NvPublic->nvPublic.authPolicy.buffer, NvPublic->nvPublic.authPolicy.size);
  Buffer += NvPublic->nvPublic.authPolicy.size;
  WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (NvPublic->nvPublic.dataSize));
  Buffer += sizeof (UINT16);

  SendBufferSize              = (UINT32)(Buffer - (UINT8 *)&SendBuffer);
  SendBuffer.Header.paramSize = SwapBytes32 (SendBufferSize);

  //
  // send Tpm command
  //
  RecvBufferSize = sizeof (RecvBuffer);
  Status         = Tpm2SubmitCommand (SendBufferSize, (UINT8 *)&SendBuffer, &RecvBufferSize, (UINT8 *)&RecvBuffer);
  if (EFI_ERROR (Status)) {
    goto Done;
  }

  if (RecvBufferSize < sizeof (TPM2_RESPONSE_HEADER)) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvDefineSpace - RecvBufferSize Error - %x\n", RecvBufferSize));
    Status = EFI_DEVICE_ERROR;
    goto Done;
  }

  ResponseCode = SwapBytes32 (RecvBuffer.Header.responseCode);
  if (ResponseCode != TPM_RC_SUCCESS) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvDefineSpace - responseCode - %x\n", SwapBytes32 (RecvBuffer.Header.responseCode)));
  }

  switch (ResponseCode) {
    case TPM_RC_SUCCESS:
      // return data
      break;
    case TPM_RC_SIZE + RC_NV_DefineSpace_publicInfo:
    case TPM_RC_SIZE + RC_NV_DefineSpace_auth:
      Status = EFI_BAD_BUFFER_SIZE;
      break;
    case TPM_RC_ATTRIBUTES:
    case TPM_RC_ATTRIBUTES + RC_NV_DefineSpace_publicInfo:
      Status = EFI_UNSUPPORTED;
      break;
    case TPM_RC_ATTRIBUTES + RC_NV_DefineSpace_authHandle:
      Status = EFI_INVALID_PARAMETER;
      break;
    case TPM_RC_NV_DEFINED:
      Status = EFI_ALREADY_STARTED;
      break;
    case TPM_RC_VALUE + RC_NV_DefineSpace_publicInfo:
    case TPM_RC_VALUE + RC_NV_DefineSpace_authHandle:
      Status = EFI_INVALID_PARAMETER;
      break;
    case TPM_RC_NV_SPACE:
      Status = EFI_OUT_OF_RESOURCES;
      break;
    default:
      Status = EFI_DEVICE_ERROR;
      break;
  }

Done:
  //
  // Clear AuthSession Content
  //
  ZeroMem (&SendBuffer, sizeof (SendBuffer));
  ZeroMem (&RecvBuffer, sizeof (RecvBuffer));
  return Status;
}

/**
  This command removes an index from the TPM.

  @param[in]  AuthHandle         TPM_RH_OWNER or TPM_RH_PLATFORM+{PP}.
  @param[in]  NvIndex            The NV Index.
  @param[in]  AuthSession        Auth Session context

  @retval EFI_SUCCESS            Operation completed successfully.
  @retval EFI_DEVICE_ERROR       The command was unsuccessful.
  @retval EFI_NOT_FOUND          The command was returned successfully, but NvIndex is not found.
**/
EFI_STATUS
EFIAPI
Tpm2NvUndefineSpace (
  IN      TPMI_RH_PROVISION  AuthHandle,
  IN      TPMI_RH_NV_INDEX   NvIndex,
  IN      TPMS_AUTH_COMMAND  *AuthSession OPTIONAL
  )
{
  EFI_STATUS                      Status;
  TPM2_NV_UNDEFINESPACE_COMMAND   SendBuffer;
  TPM2_NV_UNDEFINESPACE_RESPONSE  RecvBuffer;
  UINT32                          SendBufferSize;
  UINT32                          RecvBufferSize;
  UINT8                           *Buffer;
  UINT32                          SessionInfoSize;
  TPM_RC                          ResponseCode;

  //
  // Construct command
  //
  SendBuffer.Header.tag         = SwapBytes16 (TPM_ST_SESSIONS);
  SendBuffer.Header.commandCode = SwapBytes32 (TPM_CC_NV_UndefineSpace);

  SendBuffer.AuthHandle = SwapBytes32 (AuthHandle);
  SendBuffer.NvIndex    = SwapBytes32 (NvIndex);

  //
  // Add in Auth session
  //
  Buffer = (UINT8 *)&SendBuffer.AuthSession;

  // sessionInfoSize
  SessionInfoSize            = CopyAuthSessionCommand (AuthSession, Buffer);
  Buffer                    += SessionInfoSize;
  SendBuffer.AuthSessionSize = SwapBytes32 (SessionInfoSize);

  SendBufferSize              = (UINT32)(Buffer - (UINT8 *)&SendBuffer);
  SendBuffer.Header.paramSize = SwapBytes32 (SendBufferSize);

  //
  // send Tpm command
  //
  RecvBufferSize = sizeof (RecvBuffer);
  Status         = Tpm2SubmitCommand (SendBufferSize, (UINT8 *)&SendBuffer, &RecvBufferSize, (UINT8 *)&RecvBuffer);
  if (EFI_ERROR (Status)) {
    goto Done;
  }

  if (RecvBufferSize < sizeof (TPM2_RESPONSE_HEADER)) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvUndefineSpace - RecvBufferSize Error - %x\n", RecvBufferSize));
    Status = EFI_DEVICE_ERROR;
    goto Done;
  }

  ResponseCode = SwapBytes32 (RecvBuffer.Header.responseCode);
  if (ResponseCode != TPM_RC_SUCCESS) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvUndefineSpace - responseCode - %x\n", SwapBytes32 (RecvBuffer.Header.responseCode)));
  }

  switch (ResponseCode) {
    case TPM_RC_SUCCESS:
      // return data
      break;
    case TPM_RC_ATTRIBUTES:
    case TPM_RC_ATTRIBUTES + RC_NV_UndefineSpace_nvIndex:
      Status = EFI_UNSUPPORTED;
      break;
    case TPM_RC_NV_AUTHORIZATION:
      Status = EFI_SECURITY_VIOLATION;
      break;
    case TPM_RC_HANDLE + RC_NV_UndefineSpace_nvIndex: // TPM_RC_NV_DEFINED:
      Status = EFI_NOT_FOUND;
      break;
    case TPM_RC_HANDLE + RC_NV_UndefineSpace_authHandle: // TPM_RC_NV_DEFINED:
      Status = EFI_INVALID_PARAMETER;
      break;
    case TPM_RC_VALUE + RC_NV_UndefineSpace_authHandle:
    case TPM_RC_VALUE + RC_NV_UndefineSpace_nvIndex:
      Status = EFI_INVALID_PARAMETER;
      break;
    default:
      Status = EFI_DEVICE_ERROR;
      break;
  }

Done:
  //
  // Clear AuthSession Content
  //
  ZeroMem (&SendBuffer, sizeof (SendBuffer));
  ZeroMem (&RecvBuffer, sizeof (RecvBuffer));
  return Status;
}

/**
  This command reads a value from an area in NV memory previously defined by TPM2_NV_DefineSpace().

  @param[in]     AuthHandle         the handle indicating the source of the authorization value.
  @param[in]     NvIndex            The index to be read.
  @param[in]     AuthSession        Auth Session context
  @param[in]     Size               Number of bytes to read.
  @param[in]     Offset             Byte offset into the area.
  @param[in,out] OutData            The data read.

  @retval EFI_SUCCESS            Operation completed successfully.
  @retval EFI_DEVICE_ERROR       The command was unsuccessful.
  @retval EFI_NOT_FOUND          The command was returned successfully, but NvIndex is not found.
**/
EFI_STATUS
EFIAPI
Tpm2NvRead (
  IN      TPMI_RH_NV_AUTH    AuthHandle,
  IN      TPMI_RH_NV_INDEX   NvIndex,
  IN      TPMS_AUTH_COMMAND  *AuthSession  OPTIONAL,
  IN      UINT16             Size,
  IN      UINT16             Offset,
  IN OUT  TPM2B_MAX_BUFFER   *OutData
  )
{
  EFI_STATUS             Status;
  TPM2_NV_READ_COMMAND   SendBuffer;
  TPM2_NV_READ_RESPONSE  RecvBuffer;
  UINT32                 SendBufferSize;
  UINT32                 RecvBufferSize;
  UINT8                  *Buffer;
  UINT32                 SessionInfoSize;
  TPM_RC                 ResponseCode;

  //
  // Construct command
  //
  SendBuffer.Header.tag         = SwapBytes16 (TPM_ST_SESSIONS);
  SendBuffer.Header.commandCode = SwapBytes32 (TPM_CC_NV_Read);

  SendBuffer.AuthHandle = SwapBytes32 (AuthHandle);
  SendBuffer.NvIndex    = SwapBytes32 (NvIndex);

  //
  // Add in Auth session
  //
  Buffer = (UINT8 *)&SendBuffer.AuthSession;

  // sessionInfoSize
  SessionInfoSize            = CopyAuthSessionCommand (AuthSession, Buffer);
  Buffer                    += SessionInfoSize;
  SendBuffer.AuthSessionSize = SwapBytes32 (SessionInfoSize);

  WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Size));
  Buffer += sizeof (UINT16);
  WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Offset));
  Buffer += sizeof (UINT16);

  SendBufferSize              = (UINT32)(Buffer - (UINT8 *)&SendBuffer);
  SendBuffer.Header.paramSize = SwapBytes32 (SendBufferSize);

  //
  // send Tpm command
  //
  RecvBufferSize = sizeof (RecvBuffer);
  Status         = Tpm2SubmitCommand (SendBufferSize, (UINT8 *)&SendBuffer, &RecvBufferSize, (UINT8 *)&RecvBuffer);
  if (EFI_ERROR (Status)) {
    goto Done;
  }

  if (RecvBufferSize < sizeof (TPM2_RESPONSE_HEADER)) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvRead - RecvBufferSize Error - %x\n", RecvBufferSize));
    Status = EFI_DEVICE_ERROR;
    goto Done;
  }

  ResponseCode = SwapBytes32 (RecvBuffer.Header.responseCode);
  if (ResponseCode != TPM_RC_SUCCESS) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvRead - responseCode - %x\n", ResponseCode));
  }

  switch (ResponseCode) {
    case TPM_RC_SUCCESS:
      // return data
      break;
    case TPM_RC_NV_AUTHORIZATION:
      Status = EFI_SECURITY_VIOLATION;
      break;
    case TPM_RC_NV_LOCKED:
      Status = EFI_ACCESS_DENIED;
      break;
    case TPM_RC_NV_RANGE:
      Status = EFI_BAD_BUFFER_SIZE;
      break;
    case TPM_RC_NV_UNINITIALIZED:
      Status = EFI_NOT_READY;
      break;
    case TPM_RC_HANDLE + RC_NV_Read_nvIndex: // TPM_RC_NV_DEFINED:
      Status = EFI_NOT_FOUND;
      break;
    case TPM_RC_HANDLE + RC_NV_Read_authHandle: // TPM_RC_NV_DEFINED:
      Status = EFI_INVALID_PARAMETER;
      break;
    case TPM_RC_VALUE + RC_NV_Read_nvIndex:
    case TPM_RC_VALUE + RC_NV_Read_authHandle:
      Status = EFI_INVALID_PARAMETER;
      break;
    case TPM_RC_BAD_AUTH + RC_NV_Read_authHandle + TPM_RC_S:
      Status = EFI_INVALID_PARAMETER;
      break;
    case TPM_RC_AUTH_UNAVAILABLE:
      Status = EFI_INVALID_PARAMETER;
      break;
    case TPM_RC_AUTH_FAIL + RC_NV_Read_authHandle + TPM_RC_S:
      Status = EFI_INVALID_PARAMETER;
      break;
    case TPM_RC_ATTRIBUTES + RC_NV_Read_authHandle + TPM_RC_S:
      Status = EFI_UNSUPPORTED;
      break;
    default:
      Status = EFI_DEVICE_ERROR;
      break;
  }

  if (Status != EFI_SUCCESS) {
    goto Done;
  }

  //
  // Return the response
  //
  OutData->size = SwapBytes16 (RecvBuffer.Data.size);
  if (OutData->size > MAX_DIGEST_BUFFER) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvRead - OutData->size error %x\n", OutData->size));
    Status = EFI_DEVICE_ERROR;
    goto Done;
  }

  CopyMem (OutData->buffer, &RecvBuffer.Data.buffer, OutData->size);

Done:
  //
  // Clear AuthSession Content
  //
  ZeroMem (&SendBuffer, sizeof (SendBuffer));
  ZeroMem (&RecvBuffer, sizeof (RecvBuffer));
  return Status;
}

/**
  This command writes a value to an area in NV memory that was previously defined by TPM2_NV_DefineSpace().

  @param[in]  AuthHandle         the handle indicating the source of the authorization value.
  @param[in]  NvIndex            The NV Index of the area to write.
  @param[in]  AuthSession        Auth Session context
  @param[in]  InData             The data to write.
  @param[in]  Offset             The offset into the NV Area.

  @retval EFI_SUCCESS            Operation completed successfully.
  @retval EFI_DEVICE_ERROR       The command was unsuccessful.
  @retval EFI_NOT_FOUND          The command was returned successfully, but NvIndex is not found.
**/
EFI_STATUS
EFIAPI
Tpm2NvWrite (
  IN      TPMI_RH_NV_AUTH    AuthHandle,
  IN      TPMI_RH_NV_INDEX   NvIndex,
  IN      TPMS_AUTH_COMMAND  *AuthSession  OPTIONAL,
  IN      TPM2B_MAX_BUFFER   *InData,
  IN      UINT16             Offset
  )
{
  EFI_STATUS              Status;
  TPM2_NV_WRITE_COMMAND   SendBuffer;
  TPM2_NV_WRITE_RESPONSE  RecvBuffer;
  UINT32                  SendBufferSize;
  UINT32                  RecvBufferSize;
  UINT8                   *Buffer;
  UINT32                  SessionInfoSize;
  TPM_RC                  ResponseCode;

  //
  // Construct command
  //
  SendBuffer.Header.tag         = SwapBytes16 (TPM_ST_SESSIONS);
  SendBuffer.Header.commandCode = SwapBytes32 (TPM_CC_NV_Write);

  SendBuffer.AuthHandle = SwapBytes32 (AuthHandle);
  SendBuffer.NvIndex    = SwapBytes32 (NvIndex);

  //
  // Add in Auth session
  //
  Buffer = (UINT8 *)&SendBuffer.AuthSession;

  // sessionInfoSize
  SessionInfoSize            = CopyAuthSessionCommand (AuthSession, Buffer);
  Buffer                    += SessionInfoSize;
  SendBuffer.AuthSessionSize = SwapBytes32 (SessionInfoSize);

  WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (InData->size));
  Buffer += sizeof (UINT16);
  CopyMem (Buffer, InData->buffer, InData->size);
  Buffer += InData->size;
  WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (Offset));
  Buffer += sizeof (UINT16);

  SendBufferSize              = (UINT32)(Buffer - (UINT8 *)&SendBuffer);
  SendBuffer.Header.paramSize = SwapBytes32 (SendBufferSize);

  //
  // send Tpm command
  //
  RecvBufferSize = sizeof (RecvBuffer);
  Status         = Tpm2SubmitCommand (SendBufferSize, (UINT8 *)&SendBuffer, &RecvBufferSize, (UINT8 *)&RecvBuffer);
  if (EFI_ERROR (Status)) {
    goto Done;
  }

  if (RecvBufferSize < sizeof (TPM2_RESPONSE_HEADER)) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvWrite - RecvBufferSize Error - %x\n", RecvBufferSize));
    Status = EFI_DEVICE_ERROR;
    goto Done;
  }

  ResponseCode = SwapBytes32 (RecvBuffer.Header.responseCode);
  if (ResponseCode != TPM_RC_SUCCESS) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvWrite - responseCode - %x\n", ResponseCode));
  }

  switch (ResponseCode) {
    case TPM_RC_SUCCESS:
      // return data
      break;
    case TPM_RC_ATTRIBUTES:
      Status = EFI_UNSUPPORTED;
      break;
    case TPM_RC_NV_AUTHORIZATION:
      Status = EFI_SECURITY_VIOLATION;
      break;
    case TPM_RC_NV_LOCKED:
      Status = EFI_ACCESS_DENIED;
      break;
    case TPM_RC_NV_RANGE:
      Status = EFI_BAD_BUFFER_SIZE;
      break;
    case TPM_RC_HANDLE + RC_NV_Write_nvIndex: // TPM_RC_NV_DEFINED:
      Status = EFI_NOT_FOUND;
      break;
    case TPM_RC_HANDLE + RC_NV_Write_authHandle: // TPM_RC_NV_DEFINED:
      Status = EFI_INVALID_PARAMETER;
      break;
    case TPM_RC_VALUE + RC_NV_Write_nvIndex:
    case TPM_RC_VALUE + RC_NV_Write_authHandle:
      Status = EFI_INVALID_PARAMETER;
      break;
    case TPM_RC_BAD_AUTH + RC_NV_Write_authHandle + TPM_RC_S:
      Status = EFI_INVALID_PARAMETER;
      break;
    case TPM_RC_AUTH_UNAVAILABLE:
      Status = EFI_INVALID_PARAMETER;
      break;
    case TPM_RC_AUTH_FAIL + RC_NV_Write_authHandle + TPM_RC_S:
      Status = EFI_INVALID_PARAMETER;
      break;
    case TPM_RC_ATTRIBUTES + RC_NV_Write_authHandle + TPM_RC_S:
      Status = EFI_UNSUPPORTED;
      break;
    default:
      Status = EFI_DEVICE_ERROR;
      break;
  }

Done:
  //
  // Clear AuthSession Content
  //
  ZeroMem (&SendBuffer, sizeof (SendBuffer));
  ZeroMem (&RecvBuffer, sizeof (RecvBuffer));
  return Status;
}

/**
  This command may be used to prevent further reads of the Index until the next TPM2_Startup (TPM_SU_CLEAR).

  @param[in]  AuthHandle         the handle indicating the source of the authorization value.
  @param[in]  NvIndex            The NV Index of the area to lock.
  @param[in]  AuthSession        Auth Session context

  @retval EFI_SUCCESS            Operation completed successfully.
  @retval EFI_DEVICE_ERROR       The command was unsuccessful.
  @retval EFI_NOT_FOUND          The command was returned successfully, but NvIndex is not found.
**/
EFI_STATUS
EFIAPI
Tpm2NvReadLock (
  IN      TPMI_RH_NV_AUTH    AuthHandle,
  IN      TPMI_RH_NV_INDEX   NvIndex,
  IN      TPMS_AUTH_COMMAND  *AuthSession OPTIONAL
  )
{
  EFI_STATUS                 Status;
  TPM2_NV_READLOCK_COMMAND   SendBuffer;
  TPM2_NV_READLOCK_RESPONSE  RecvBuffer;
  UINT32                     SendBufferSize;
  UINT32                     RecvBufferSize;
  UINT8                      *Buffer;
  UINT32                     SessionInfoSize;
  TPM_RC                     ResponseCode;

  //
  // Construct command
  //
  SendBuffer.Header.tag         = SwapBytes16 (TPM_ST_SESSIONS);
  SendBuffer.Header.commandCode = SwapBytes32 (TPM_CC_NV_ReadLock);

  SendBuffer.AuthHandle = SwapBytes32 (AuthHandle);
  SendBuffer.NvIndex    = SwapBytes32 (NvIndex);

  //
  // Add in Auth session
  //
  Buffer = (UINT8 *)&SendBuffer.AuthSession;

  // sessionInfoSize
  SessionInfoSize            = CopyAuthSessionCommand (AuthSession, Buffer);
  Buffer                    += SessionInfoSize;
  SendBuffer.AuthSessionSize = SwapBytes32 (SessionInfoSize);

  SendBufferSize              = (UINT32)(Buffer - (UINT8 *)&SendBuffer);
  SendBuffer.Header.paramSize = SwapBytes32 (SendBufferSize);

  //
  // send Tpm command
  //
  RecvBufferSize = sizeof (RecvBuffer);
  Status         = Tpm2SubmitCommand (SendBufferSize, (UINT8 *)&SendBuffer, &RecvBufferSize, (UINT8 *)&RecvBuffer);
  if (EFI_ERROR (Status)) {
    goto Done;
  }

  if (RecvBufferSize < sizeof (TPM2_RESPONSE_HEADER)) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvReadLock - RecvBufferSize Error - %x\n", RecvBufferSize));
    Status = EFI_DEVICE_ERROR;
    goto Done;
  }

  ResponseCode = SwapBytes32 (RecvBuffer.Header.responseCode);
  if (ResponseCode != TPM_RC_SUCCESS) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvReadLock - responseCode - %x\n", SwapBytes32 (RecvBuffer.Header.responseCode)));
  }

  switch (ResponseCode) {
    case TPM_RC_SUCCESS:
      // return data
      break;
    default:
      Status = EFI_DEVICE_ERROR;
      break;
  }

Done:
  //
  // Clear AuthSession Content
  //
  ZeroMem (&SendBuffer, sizeof (SendBuffer));
  ZeroMem (&RecvBuffer, sizeof (RecvBuffer));
  return Status;
}

/**
  This command may be used to inhibit further writes of the Index.

  @param[in]  AuthHandle         the handle indicating the source of the authorization value.
  @param[in]  NvIndex            The NV Index of the area to lock.
  @param[in]  AuthSession        Auth Session context

  @retval EFI_SUCCESS            Operation completed successfully.
  @retval EFI_DEVICE_ERROR       The command was unsuccessful.
  @retval EFI_NOT_FOUND          The command was returned successfully, but NvIndex is not found.
**/
EFI_STATUS
EFIAPI
Tpm2NvWriteLock (
  IN      TPMI_RH_NV_AUTH    AuthHandle,
  IN      TPMI_RH_NV_INDEX   NvIndex,
  IN      TPMS_AUTH_COMMAND  *AuthSession OPTIONAL
  )
{
  EFI_STATUS                  Status;
  TPM2_NV_WRITELOCK_COMMAND   SendBuffer;
  TPM2_NV_WRITELOCK_RESPONSE  RecvBuffer;
  UINT32                      SendBufferSize;
  UINT32                      RecvBufferSize;
  UINT8                       *Buffer;
  UINT32                      SessionInfoSize;
  TPM_RC                      ResponseCode;

  //
  // Construct command
  //
  SendBuffer.Header.tag         = SwapBytes16 (TPM_ST_SESSIONS);
  SendBuffer.Header.commandCode = SwapBytes32 (TPM_CC_NV_WriteLock);

  SendBuffer.AuthHandle = SwapBytes32 (AuthHandle);
  SendBuffer.NvIndex    = SwapBytes32 (NvIndex);

  //
  // Add in Auth session
  //
  Buffer = (UINT8 *)&SendBuffer.AuthSession;

  // sessionInfoSize
  SessionInfoSize            = CopyAuthSessionCommand (AuthSession, Buffer);
  Buffer                    += SessionInfoSize;
  SendBuffer.AuthSessionSize = SwapBytes32 (SessionInfoSize);

  SendBufferSize              = (UINT32)(Buffer - (UINT8 *)&SendBuffer);
  SendBuffer.Header.paramSize = SwapBytes32 (SendBufferSize);

  //
  // send Tpm command
  //
  RecvBufferSize = sizeof (RecvBuffer);
  Status         = Tpm2SubmitCommand (SendBufferSize, (UINT8 *)&SendBuffer, &RecvBufferSize, (UINT8 *)&RecvBuffer);
  if (EFI_ERROR (Status)) {
    goto Done;
  }

  if (RecvBufferSize < sizeof (TPM2_RESPONSE_HEADER)) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvWriteLock - RecvBufferSize Error - %x\n", RecvBufferSize));
    Status = EFI_DEVICE_ERROR;
    goto Done;
  }

  ResponseCode = SwapBytes32 (RecvBuffer.Header.responseCode);
  if (ResponseCode != TPM_RC_SUCCESS) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvWriteLock - responseCode - %x\n", SwapBytes32 (RecvBuffer.Header.responseCode)));
  }

  switch (ResponseCode) {
    case TPM_RC_SUCCESS:
      // return data
      break;
    default:
      Status = EFI_DEVICE_ERROR;
      break;
  }

Done:
  //
  // Clear AuthSession Content
  //
  ZeroMem (&SendBuffer, sizeof (SendBuffer));
  ZeroMem (&RecvBuffer, sizeof (RecvBuffer));
  return Status;
}

/**
  The command will SET TPMA_NV_WRITELOCKED for all indexes that have their TPMA_NV_GLOBALLOCK attribute SET.

  @param[in]  AuthHandle         TPM_RH_OWNER or TPM_RH_PLATFORM+{PP}.
  @param[in]  AuthSession        Auth Session context

  @retval EFI_SUCCESS            Operation completed successfully.
  @retval EFI_DEVICE_ERROR       The command was unsuccessful.
  @retval EFI_NOT_FOUND          The command was returned successfully, but NvIndex is not found.
**/
EFI_STATUS
EFIAPI
Tpm2NvGlobalWriteLock (
  IN      TPMI_RH_PROVISION  AuthHandle,
  IN      TPMS_AUTH_COMMAND  *AuthSession OPTIONAL
  )
{
  EFI_STATUS                        Status;
  TPM2_NV_GLOBALWRITELOCK_COMMAND   SendBuffer;
  TPM2_NV_GLOBALWRITELOCK_RESPONSE  RecvBuffer;
  UINT32                            SendBufferSize;
  UINT32                            RecvBufferSize;
  UINT8                             *Buffer;
  UINT32                            SessionInfoSize;
  TPM_RC                            ResponseCode;

  //
  // Construct command
  //
  SendBuffer.Header.tag         = SwapBytes16 (TPM_ST_SESSIONS);
  SendBuffer.Header.commandCode = SwapBytes32 (TPM_CC_NV_GlobalWriteLock);

  SendBuffer.AuthHandle = SwapBytes32 (AuthHandle);

  //
  // Add in Auth session
  //
  Buffer = (UINT8 *)&SendBuffer.AuthSession;

  // sessionInfoSize
  SessionInfoSize            = CopyAuthSessionCommand (AuthSession, Buffer);
  Buffer                    += SessionInfoSize;
  SendBuffer.AuthSessionSize = SwapBytes32 (SessionInfoSize);

  SendBufferSize              = (UINT32)(Buffer - (UINT8 *)&SendBuffer);
  SendBuffer.Header.paramSize = SwapBytes32 (SendBufferSize);

  //
  // send Tpm command
  //
  RecvBufferSize = sizeof (RecvBuffer);
  Status         = Tpm2SubmitCommand (SendBufferSize, (UINT8 *)&SendBuffer, &RecvBufferSize, (UINT8 *)&RecvBuffer);
  if (EFI_ERROR (Status)) {
    goto Done;
  }

  if (RecvBufferSize < sizeof (TPM2_RESPONSE_HEADER)) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvGlobalWriteLock - RecvBufferSize Error - %x\n", RecvBufferSize));
    Status = EFI_DEVICE_ERROR;
    goto Done;
  }

  ResponseCode = SwapBytes32 (RecvBuffer.Header.responseCode);
  if (ResponseCode != TPM_RC_SUCCESS) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvGlobalWriteLock - responseCode - %x\n", SwapBytes32 (RecvBuffer.Header.responseCode)));
  }

  switch (ResponseCode) {
    case TPM_RC_SUCCESS:
      // return data
      break;
    default:
      Status = EFI_DEVICE_ERROR;
      break;
  }

Done:
  //
  // Clear AuthSession Content
  //
  ZeroMem (&SendBuffer, sizeof (SendBuffer));
  ZeroMem (&RecvBuffer, sizeof (RecvBuffer));
  return Status;
}

/**
  This command extends a value to an area in NV memory that was previously defined by TPM2_NV_DefineSpace().

  @param[in]  AuthHandle         the handle indicating the source of the authorization value.
  @param[in]  NvIndex            The NV Index of the area to extend.
  @param[in]  AuthSession        Auth Session context
  @param[in]  InData             The data to extend.

  @retval EFI_SUCCESS            Operation completed successfully.
  @retval EFI_DEVICE_ERROR       The command was unsuccessful.
  @retval EFI_NOT_FOUND          The command was returned successfully, but NvIndex is not found.
**/
EFI_STATUS
EFIAPI
Tpm2NvExtend (
  IN      TPMI_RH_NV_AUTH    AuthHandle,
  IN      TPMI_RH_NV_INDEX   NvIndex,
  IN      TPMS_AUTH_COMMAND  *AuthSession  OPTIONAL,
  IN      TPM2B_MAX_BUFFER   *InData
  )
{
  EFI_STATUS               Status;
  TPM2_NV_EXTEND_COMMAND   SendBuffer;
  TPM2_NV_EXTEND_RESPONSE  RecvBuffer;
  UINT32                   SendBufferSize;
  UINT32                   RecvBufferSize;
  UINT8                    *Buffer;
  UINT32                   SessionInfoSize;
  TPM_RC                   ResponseCode;

  //
  // Construct command
  //
  SendBuffer.Header.tag         = SwapBytes16 (TPM_ST_SESSIONS);
  SendBuffer.Header.commandCode = SwapBytes32 (TPM_CC_NV_Extend);

  SendBuffer.AuthHandle = SwapBytes32 (AuthHandle);
  SendBuffer.NvIndex    = SwapBytes32 (NvIndex);

  //
  // Add in Auth session
  //
  Buffer = (UINT8 *)&SendBuffer.AuthSession;

  // sessionInfoSize
  SessionInfoSize            = CopyAuthSessionCommand (AuthSession, Buffer);
  Buffer                    += SessionInfoSize;
  SendBuffer.AuthSessionSize = SwapBytes32 (SessionInfoSize);

  WriteUnaligned16 ((UINT16 *)Buffer, SwapBytes16 (InData->size));
  Buffer += sizeof (UINT16);
  CopyMem (Buffer, InData->buffer, InData->size);
  Buffer += InData->size;

  SendBufferSize              = (UINT32)(Buffer - (UINT8 *)&SendBuffer);
  SendBuffer.Header.paramSize = SwapBytes32 (SendBufferSize);

  //
  // send Tpm command
  //
  RecvBufferSize = sizeof (RecvBuffer);
  Status         = Tpm2SubmitCommand (SendBufferSize, (UINT8 *)&SendBuffer, &RecvBufferSize, (UINT8 *)&RecvBuffer);
  if (EFI_ERROR (Status)) {
    goto Done;
  }

  if (RecvBufferSize < sizeof (TPM2_RESPONSE_HEADER)) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvExtend - RecvBufferSize Error - %x\n", RecvBufferSize));
    Status = EFI_DEVICE_ERROR;
    goto Done;
  }

  ResponseCode = SwapBytes32 (RecvBuffer.Header.responseCode);
  if (ResponseCode != TPM_RC_SUCCESS) {
    DEBUG ((DEBUG_ERROR, "Tpm2NvExtend - responseCode - %x\n", ResponseCode));
  }

  switch (ResponseCode) {
    case TPM_RC_SUCCESS:
      // return data
      break;
    case TPM_RC_ATTRIBUTES:
      Status = EFI_UNSUPPORTED;
      break;
    case TPM_RC_NV_AUTHORIZATION:
      Status = EFI_SECURITY_VIOLATION;
      break;
    case TPM_RC_NV_LOCKED:
      Status = EFI_ACCESS_DENIED;
      break;
    default:
      Status = EFI_DEVICE_ERROR;
      break;
  }

Done:
  //
  // Clear AuthSession Content
  //
  ZeroMem (&SendBuffer, sizeof (SendBuffer));
  ZeroMem (&RecvBuffer, sizeof (RecvBuffer));
  return Status;
}