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/** @file
This library is HashLib for Tdx.
Copyright (c) 2021 - 2022, Intel Corporation. All rights reserved. <BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiPei.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/PcdLib.h>
#include <Library/HashLib.h>
#include <Library/TdxLib.h>
#include <Protocol/CcMeasurement.h>
EFI_GUID mSha384Guid = HASH_ALGORITHM_SHA384_GUID;
//
// Currently TDX supports SHA384.
//
HASH_INTERFACE mHashInterface = {
{ 0 }, NULL, NULL, NULL
};
UINTN mHashInterfaceCount = 0;
/**
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
)
{
HASH_HANDLE HashCtx;
if (mHashInterfaceCount == 0) {
ASSERT (FALSE);
return EFI_UNSUPPORTED;
}
HashCtx = 0;
mHashInterface.HashInit (&HashCtx);
*HashHandle = HashCtx;
return EFI_SUCCESS;
}
/**
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
)
{
if (mHashInterfaceCount == 0) {
ASSERT (FALSE);
return EFI_UNSUPPORTED;
}
mHashInterface.HashUpdate (HashHandle, DataToHash, DataToHashLen);
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
)
{
TPML_DIGEST_VALUES Digest;
EFI_STATUS Status;
if (mHashInterfaceCount == 0) {
ASSERT (FALSE);
return EFI_UNSUPPORTED;
}
ZeroMem (DigestList, sizeof (*DigestList));
mHashInterface.HashUpdate (HashHandle, DataToHash, DataToHashLen);
mHashInterface.HashFinal (HashHandle, &Digest);
CopyMem (
&DigestList->digests[0],
&Digest.digests[0],
sizeof (Digest.digests[0])
);
DigestList->count++;
ASSERT (DigestList->count == 1 && DigestList->digests[0].hashAlg == TPM_ALG_SHA384);
Status = TdExtendRtmr (
(UINT32 *)DigestList->digests[0].digest.sha384,
SHA384_DIGEST_SIZE,
(UINT8)PcrIndex
);
ASSERT (!EFI_ERROR (Status));
return Status;
}
/**
Hash data and extend to RTMR.
@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
)
{
HASH_HANDLE HashHandle;
EFI_STATUS Status;
if (mHashInterfaceCount == 0) {
ASSERT (FALSE);
return EFI_UNSUPPORTED;
}
ASSERT (TdIsEnabled ());
HashStart (&HashHandle);
HashUpdate (HashHandle, DataToHash, DataToHashLen);
Status = HashCompleteAndExtend (HashHandle, PcrIndex, NULL, 0, DigestList);
return Status;
}
/**
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
)
{
//
// HashLibTdx is designed for Tdx guest. So if it is not Tdx guest,
// return EFI_UNSUPPORTED.
//
if (!TdIsEnabled ()) {
return EFI_UNSUPPORTED;
}
//
// Only SHA384 is allowed.
//
if (!CompareGuid (&mSha384Guid, &HashInterface->HashGuid)) {
return EFI_UNSUPPORTED;
}
if (mHashInterfaceCount != 0) {
ASSERT (FALSE);
return EFI_OUT_OF_RESOURCES;
}
CopyMem (&mHashInterface, HashInterface, sizeof (*HashInterface));
mHashInterfaceCount++;
return EFI_SUCCESS;
}
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