system76-edk2/SecurityPkg/Library/HashLibTpm2/HashLibTpm2.c

/** @file
  This library uses TPM2 device to calculation hash.

Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved. <BR>
(C) Copyright 2015 Hewlett Packard Enterprise Development LP<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include <PiPei.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/Tpm2CommandLib.h>
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/HashLib.h>
#include <Library/PcdLib.h>

typedef struct {
  TPM_ALG_ID AlgoId;
  UINT32     Mask;
} TPM2_HASH_MASK;

TPM2_HASH_MASK mTpm2HashMask[] = {
  {TPM_ALG_SHA1,         HASH_ALG_SHA1},
  {TPM_ALG_SHA256,       HASH_ALG_SHA256},
  {TPM_ALG_SHA384,       HASH_ALG_SHA384},
  {TPM_ALG_SHA512,       HASH_ALG_SHA512},
};

/**
  The function get algorithm from hash mask info.

  @return Hash algorithm
**/
TPM_ALG_ID
Tpm2GetAlgoFromHashMask (
  VOID
  )
{
  UINT32 HashMask;
  UINTN  Index;

  HashMask = PcdGet32 (PcdTpm2HashMask);
  for (Index = 0; Index < sizeof(mTpm2HashMask)/sizeof(mTpm2HashMask[0]); Index++) {
    if (mTpm2HashMask[Index].Mask == HashMask) {
      return mTpm2HashMask[Index].AlgoId;
    }
  }

  return TPM_ALG_NULL;
}

/**
  Start hash sequence.

  @param HashHandle Hash handle.

  @retval EFI_SUCCESS          Hash sequence start and HandleHandle returned.
  @retval EFI_OUT_OF_RESOURCES No enough resource to start hash.
**/
EFI_STATUS
EFIAPI
HashStart (
  OUT HASH_HANDLE    *HashHandle
  )
{
  TPMI_DH_OBJECT        SequenceHandle;
  EFI_STATUS            Status;
  TPM_ALG_ID            AlgoId;

  AlgoId = Tpm2GetAlgoFromHashMask ();

  Status = Tpm2HashSequenceStart (AlgoId, &SequenceHandle);
  if (!EFI_ERROR (Status)) {
    *HashHandle = (HASH_HANDLE)SequenceHandle;
  }
  return Status;
}

/**
  Update hash sequence data.

  @param HashHandle    Hash handle.
  @param DataToHash    Data to be hashed.
  @param DataToHashLen Data size.

  @retval EFI_SUCCESS     Hash sequence updated.
**/
EFI_STATUS
EFIAPI
HashUpdate (
  IN HASH_HANDLE    HashHandle,
  IN VOID           *DataToHash,
  IN UINTN          DataToHashLen
  )
{
  UINT8            *Buffer;
  UINT64           HashLen;
  TPM2B_MAX_BUFFER HashBuffer;
  EFI_STATUS       Status;

  Buffer = (UINT8 *)(UINTN)DataToHash;
  for (HashLen = DataToHashLen; HashLen > sizeof(HashBuffer.buffer); HashLen -= sizeof(HashBuffer.buffer)) {

    HashBuffer.size = sizeof(HashBuffer.buffer);
    CopyMem(HashBuffer.buffer, Buffer, sizeof(HashBuffer.buffer));
    Buffer += sizeof(HashBuffer.buffer);

    Status = Tpm2SequenceUpdate((TPMI_DH_OBJECT)HashHandle, &HashBuffer);
    if (EFI_ERROR(Status)) {
      return EFI_DEVICE_ERROR;
    }
  }

  //
  // Last one
  //
  HashBuffer.size = (UINT16)HashLen;
  CopyMem(HashBuffer.buffer, Buffer, (UINTN)HashLen);
  Status = Tpm2SequenceUpdate((TPMI_DH_OBJECT)HashHandle, &HashBuffer);
  if (EFI_ERROR(Status)) {
    return EFI_DEVICE_ERROR;
  }

  return EFI_SUCCESS;
}

/**
  Hash sequence complete and extend to PCR.

  @param HashHandle    Hash handle.
  @param PcrIndex      PCR to be extended.
  @param DataToHash    Data to be hashed.
  @param DataToHashLen Data size.
  @param DigestList    Digest list.

  @retval EFI_SUCCESS     Hash sequence complete and DigestList is returned.
**/
EFI_STATUS
EFIAPI
HashCompleteAndExtend (
  IN HASH_HANDLE         HashHandle,
  IN TPMI_DH_PCR         PcrIndex,
  IN VOID                *DataToHash,
  IN UINTN               DataToHashLen,
  OUT TPML_DIGEST_VALUES *DigestList
  )
{
  UINT8            *Buffer;
  UINT64           HashLen;
  TPM2B_MAX_BUFFER HashBuffer;
  EFI_STATUS       Status;
  TPM_ALG_ID       AlgoId;
  TPM2B_DIGEST     Result;

  AlgoId = Tpm2GetAlgoFromHashMask ();

  Buffer = (UINT8 *)(UINTN)DataToHash;
  for (HashLen = DataToHashLen; HashLen > sizeof(HashBuffer.buffer); HashLen -= sizeof(HashBuffer.buffer)) {

    HashBuffer.size = sizeof(HashBuffer.buffer);
    CopyMem(HashBuffer.buffer, Buffer, sizeof(HashBuffer.buffer));
    Buffer += sizeof(HashBuffer.buffer);

    Status = Tpm2SequenceUpdate((TPMI_DH_OBJECT)HashHandle, &HashBuffer);
    if (EFI_ERROR(Status)) {
      return EFI_DEVICE_ERROR;
    }
  }

  //
  // Last one
  //
  HashBuffer.size = (UINT16)HashLen;
  CopyMem(HashBuffer.buffer, Buffer, (UINTN)HashLen);

  ZeroMem(DigestList, sizeof(*DigestList));
  DigestList->count = HASH_COUNT;

  if (AlgoId == TPM_ALG_NULL) {
    Status = Tpm2EventSequenceComplete (
               PcrIndex,
               (TPMI_DH_OBJECT)HashHandle,
               &HashBuffer,
               DigestList
               );
  } else {
    Status = Tpm2SequenceComplete (
               (TPMI_DH_OBJECT)HashHandle,
               &HashBuffer,
               &Result
               );
    if (EFI_ERROR(Status)) {
      return EFI_DEVICE_ERROR;
    }

    DigestList->count = 1;
    DigestList->digests[0].hashAlg = AlgoId;
    CopyMem (&DigestList->digests[0].digest, Result.buffer, Result.size);
    Status = Tpm2PcrExtend (
               PcrIndex,
               DigestList
               );
  }
  if (EFI_ERROR(Status)) {
    return EFI_DEVICE_ERROR;
  }
  return EFI_SUCCESS;
}

/**
  Hash data and extend to PCR.

  @param PcrIndex      PCR to be extended.
  @param DataToHash    Data to be hashed.
  @param DataToHashLen Data size.
  @param DigestList    Digest list.

  @retval EFI_SUCCESS     Hash data and DigestList is returned.
**/
EFI_STATUS
EFIAPI
HashAndExtend (
  IN TPMI_DH_PCR                    PcrIndex,
  IN VOID                           *DataToHash,
  IN UINTN                          DataToHashLen,
  OUT TPML_DIGEST_VALUES            *DigestList
  )
{
  EFI_STATUS         Status;
  UINT8              *Buffer;
  UINT64             HashLen;
  TPMI_DH_OBJECT     SequenceHandle;
  TPM2B_MAX_BUFFER   HashBuffer;
  TPM_ALG_ID         AlgoId;
  TPM2B_EVENT        EventData;
  TPM2B_DIGEST       Result;

  DEBUG((EFI_D_VERBOSE, "\n HashAndExtend Entry \n"));

  SequenceHandle = 0xFFFFFFFF; // Know bad value

  AlgoId = Tpm2GetAlgoFromHashMask ();

  if ((AlgoId == TPM_ALG_NULL) && (DataToHashLen <= sizeof(EventData.buffer))) {
    EventData.size = (UINT16)DataToHashLen;
    CopyMem (EventData.buffer, DataToHash, DataToHashLen);
    Status = Tpm2PcrEvent (PcrIndex, &EventData, DigestList);
    if (EFI_ERROR(Status)) {
      return EFI_DEVICE_ERROR;
    }
    return EFI_SUCCESS;
  }

  Status = Tpm2HashSequenceStart(AlgoId, &SequenceHandle);
  if (EFI_ERROR(Status)) {
    return EFI_DEVICE_ERROR;
  }
  DEBUG((EFI_D_VERBOSE, "\n Tpm2HashSequenceStart Success \n"));

  Buffer = (UINT8 *)(UINTN)DataToHash;
  for (HashLen = DataToHashLen; HashLen > sizeof(HashBuffer.buffer); HashLen -= sizeof(HashBuffer.buffer)) {

    HashBuffer.size = sizeof(HashBuffer.buffer);
    CopyMem(HashBuffer.buffer, Buffer, sizeof(HashBuffer.buffer));
    Buffer += sizeof(HashBuffer.buffer);

    Status = Tpm2SequenceUpdate(SequenceHandle, &HashBuffer);
    if (EFI_ERROR(Status)) {
      return EFI_DEVICE_ERROR;
    }
  }
  DEBUG((EFI_D_VERBOSE, "\n Tpm2SequenceUpdate Success \n"));

  HashBuffer.size = (UINT16)HashLen;
  CopyMem(HashBuffer.buffer, Buffer, (UINTN)HashLen);

  ZeroMem(DigestList, sizeof(*DigestList));
  DigestList->count = HASH_COUNT;

  if (AlgoId == TPM_ALG_NULL) {
    Status = Tpm2EventSequenceComplete (
               PcrIndex,
               SequenceHandle,
               &HashBuffer,
               DigestList
               );
    if (EFI_ERROR(Status)) {
      return EFI_DEVICE_ERROR;
    }
    DEBUG((EFI_D_VERBOSE, "\n Tpm2EventSequenceComplete Success \n"));
  } else {
    Status = Tpm2SequenceComplete (
               SequenceHandle,
               &HashBuffer,
               &Result
               );
    if (EFI_ERROR(Status)) {
      return EFI_DEVICE_ERROR;
    }
    DEBUG((EFI_D_VERBOSE, "\n Tpm2SequenceComplete Success \n"));

    DigestList->count = 1;
    DigestList->digests[0].hashAlg = AlgoId;
    CopyMem (&DigestList->digests[0].digest, Result.buffer, Result.size);
    Status = Tpm2PcrExtend (
               PcrIndex,
               DigestList
               );
    if (EFI_ERROR(Status)) {
      return EFI_DEVICE_ERROR;
    }
    DEBUG((EFI_D_VERBOSE, "\n Tpm2PcrExtend Success \n"));
  }

  return EFI_SUCCESS;
}

/**
  This service register Hash.

  @param HashInterface  Hash interface

  @retval EFI_SUCCESS          This hash interface is registered successfully.
  @retval EFI_UNSUPPORTED      System does not support register this interface.
  @retval EFI_ALREADY_STARTED  System already register this interface.
**/
EFI_STATUS
EFIAPI
RegisterHashInterfaceLib (
  IN HASH_INTERFACE   *HashInterface
  )
{
  return EFI_UNSUPPORTED;
}