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 This program and the accompanying materials
   6 are licensed and made available under the terms and conditions of the BSD License
   7 which accompanies this distribution.  The full text of the license may be found at
   8 http://opensource.org/licenses/bsd-license.php
   9
  10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include <PiPei.h>
  16 #include <Library/Tpm12CommandLib.h>
  17 #include <Library/BaseLib.h>
  18 #include <Library/DebugLib.h>
  19 #include <Library/BaseMemoryLib.h>
  20 #include <Library/Tpm12DeviceLib.h>
  21
  22 #pragma pack(1)
  23
  24 typedef struct {
  25   TPM_RQU_COMMAND_HDR   Hdr;
  26   TPM_PCRINDEX          PcrIndex;
  27   TPM_DIGEST            TpmDigest;
  28 } TPM_CMD_EXTEND;
  29
  30 typedef struct {
  31   TPM_RSP_COMMAND_HDR   Hdr;
  32   TPM_DIGEST            TpmDigest;
  33 } TPM_RSP_EXTEND;
  34
  35 #pragma pack()
  36
  37 /**
  38 Extend a TPM PCR.
  39
  40 @param[in]  DigestToExtend    The 160 bit value representing the event to be recorded.
  41 @param[in]  PcrIndex          The PCR to be updated.
  42 @param[out] NewPcrValue       New PCR value after extend.
  43
  44 @retval EFI_SUCCESS           Operation completed successfully.
  45 @retval EFI_TIMEOUT           The register can't run into the expected status in time.
  46 @retval EFI_BUFFER_TOO_SMALL  Response data buffer is too small.
  47 @retval EFI_DEVICE_ERROR      Unexpected device behavior.
  48
  49 **/
  50 EFI_STATUS
  51 EFIAPI
  52 Tpm12Extend (
  53   IN  TPM_DIGEST    *DigestToExtend,
  54   IN  TPM_PCRINDEX  PcrIndex,
  55   OUT TPM_DIGEST    *NewPcrValue
  56   )
  57 {
  58   EFI_STATUS      Status;
  59   TPM_CMD_EXTEND  Command;
  60   TPM_RSP_EXTEND  Response;
  61   UINT32          Length;
  62
  63   //
  64   // send Tpm command TPM_ORD_Extend
  65   //
  66   Command.Hdr.tag       = SwapBytes16 (TPM_TAG_RQU_COMMAND);
  67   Command.Hdr.paramSize = SwapBytes32 (sizeof (Command));
  68   Command.Hdr.ordinal   = SwapBytes32 (TPM_ORD_Extend);
  69   Command.PcrIndex      = SwapBytes32 (PcrIndex);
  70   CopyMem (&Command.TpmDigest, DigestToExtend, sizeof (Command.TpmDigest));
  71   Length = sizeof (Response);
  72   Status = Tpm12SubmitCommand (sizeof (Command), (UINT8 *)&Command, &Length, (UINT8 *)&Response);
  73   if (EFI_ERROR (Status)) {
  74     return Status;
  75   }
  76
  77   if (SwapBytes32(Response.Hdr.returnCode) != TPM_SUCCESS) {
  78     DEBUG ((EFI_D_ERROR, "Tpm12Extend: Response Code error! 0x%08x\r\n", SwapBytes32(Response.Hdr.returnCode)));
  79     return EFI_DEVICE_ERROR;
  80   }
  81
  82   if (NewPcrValue != NULL) {
  83     CopyMem (NewPcrValue, &Response.TpmDigest, sizeof (*NewPcrValue));
  84   }
  85
  86   return Status;
  87 }