SecurityPkg/Library/PeiTpmMeasurementLib/PeiTpmMeasurementLib.c

   1 /** @file
   2   This library is used by other modules to measure data to TPM.
   3
   4 Copyright (c) 2020, Intel Corporation. All rights reserved. <BR>
   5 SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include <PiPei.h>
  10
  11 #include <Library/BaseMemoryLib.h>
  12 #include <Library/PeiServicesLib.h>
  13 #include <Library/PeiServicesTablePointerLib.h>
  14 #include <Library/DebugLib.h>
  15 #include <Library/HobLib.h>
  16 #include <Library/TpmMeasurementLib.h>
  17
  18 #include <Ppi/Tcg.h>
  19 #include <IndustryStandard/UefiTcgPlatform.h>
  20
  21 /**
  22   Tpm measure and log data, and extend the measurement result into a specific PCR.
  23
  24   @param[in]  PcrIndex         PCR Index.
  25   @param[in]  EventType        Event type.
  26   @param[in]  EventLog         Measurement event log.
  27   @param[in]  LogLen           Event log length in bytes.
  28   @param[in]  HashData         The start of the data buffer to be hashed, extended.
  29   @param[in]  HashDataLen      The length, in bytes, of the buffer referenced by HashData
  30
  31   @retval EFI_SUCCESS           Operation completed successfully.
  32   @retval EFI_UNSUPPORTED       TPM device not available.
  33   @retval EFI_OUT_OF_RESOURCES  Out of memory.
  34   @retval EFI_DEVICE_ERROR      The operation was unsuccessful.
  35 **/
  36 EFI_STATUS
  37 EFIAPI
  38 TpmMeasureAndLogData (
  39   IN UINT32  PcrIndex,
  40   IN UINT32  EventType,
  41   IN VOID    *EventLog,
  42   IN UINT32  LogLen,
  43   IN VOID    *HashData,
  44   IN UINT64  HashDataLen
  45   )
  46 {
  47   EFI_STATUS         Status;
  48   EDKII_TCG_PPI      *TcgPpi;
  49   TCG_PCR_EVENT_HDR  TcgEventHdr;
  50
  51   Status = PeiServicesLocatePpi (
  52              &gEdkiiTcgPpiGuid,
  53              0,
  54              NULL,
  55              (VOID **)&TcgPpi
  56              );
  57   if (EFI_ERROR (Status)) {
  58     return Status;
  59   }
  60
  61   TcgEventHdr.PCRIndex  = PcrIndex;
  62   TcgEventHdr.EventType = EventType;
  63   TcgEventHdr.EventSize = LogLen;
  64
  65   Status = TcgPpi->HashLogExtendEvent (
  66                      TcgPpi,
  67                      0,
  68                      HashData,
  69                      (UINTN)HashDataLen,
  70                      &TcgEventHdr,
  71                      EventLog
  72                      );
  73   return Status;
  74 }