SecurityPkg/Library/Tpm12CommandLib/Tpm12Pcr.c

   1 /** @file
   2   Implement TPM1.2 PCR related commands.
   3
   4 Copyright (c) 2016, Intel Corporation. All rights reserved. <BR>
   5 SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include <PiPei.h>
  10 #include <Library/Tpm12CommandLib.h>
  11 #include <Library/BaseLib.h>
  12 #include <Library/DebugLib.h>
  13 #include <Library/BaseMemoryLib.h>
  14 #include <Library/Tpm12DeviceLib.h>
  15
  16 #pragma pack(1)
  17
  18 typedef struct {
  19   TPM_RQU_COMMAND_HDR    Hdr;
  20   TPM_PCRINDEX           PcrIndex;
  21   TPM_DIGEST             TpmDigest;
  22 } TPM_CMD_EXTEND;
  23
  24 typedef struct {
  25   TPM_RSP_COMMAND_HDR    Hdr;
  26   TPM_DIGEST             TpmDigest;
  27 } TPM_RSP_EXTEND;
  28
  29 #pragma pack()
  30
  31 /**
  32 Extend a TPM PCR.
  33
  34 @param[in]  DigestToExtend    The 160 bit value representing the event to be recorded.
  35 @param[in]  PcrIndex          The PCR to be updated.
  36 @param[out] NewPcrValue       New PCR value after extend.
  37
  38 @retval EFI_SUCCESS           Operation completed successfully.
  39 @retval EFI_TIMEOUT           The register can't run into the expected status in time.
  40 @retval EFI_BUFFER_TOO_SMALL  Response data buffer is too small.
  41 @retval EFI_DEVICE_ERROR      Unexpected device behavior.
  42
  43 **/
  44 EFI_STATUS
  45 EFIAPI
  46 Tpm12Extend (
  47   IN  TPM_DIGEST    *DigestToExtend,
  48   IN  TPM_PCRINDEX  PcrIndex,
  49   OUT TPM_DIGEST    *NewPcrValue
  50   )
  51 {
  52   EFI_STATUS      Status;
  53   TPM_CMD_EXTEND  Command;
  54   TPM_RSP_EXTEND  Response;
  55   UINT32          Length;
  56
  57   //
  58   // send Tpm command TPM_ORD_Extend
  59   //
  60   Command.Hdr.tag       = SwapBytes16 (TPM_TAG_RQU_COMMAND);
  61   Command.Hdr.paramSize = SwapBytes32 (sizeof (Command));
  62   Command.Hdr.ordinal   = SwapBytes32 (TPM_ORD_Extend);
  63   Command.PcrIndex      = SwapBytes32 (PcrIndex);
  64   CopyMem (&Command.TpmDigest, DigestToExtend, sizeof (Command.TpmDigest));
  65   Length = sizeof (Response);
  66   Status = Tpm12SubmitCommand (sizeof (Command), (UINT8 *)&Command, &Length, (UINT8 *)&Response);
  67   if (EFI_ERROR (Status)) {
  68     return Status;
  69   }
  70
  71   if (SwapBytes32 (Response.Hdr.returnCode) != TPM_SUCCESS) {
  72     DEBUG ((DEBUG_ERROR, "Tpm12Extend: Response Code error! 0x%08x\r\n", SwapBytes32 (Response.Hdr.returnCode)));
  73     return EFI_DEVICE_ERROR;
  74   }
  75
  76   if (NewPcrValue != NULL) {
  77     CopyMem (NewPcrValue, &Response.TpmDigest, sizeof (*NewPcrValue));
  78   }
  79
  80   return Status;
  81 }