/** @file | |
Ihis library is BaseCrypto SHA256 hash instance. | |
It can be registered to BaseCrypto router, to serve as hash engine. | |
Copyright (c) 2013, Intel Corporation. All rights reserved. <BR> | |
This program and the accompanying materials | |
are licensed and made available under the terms and conditions of the BSD License | |
which accompanies this distribution. The full text of the license may be found at | |
http://opensource.org/licenses/bsd-license.php | |
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
**/ | |
#include <PiPei.h> | |
#include <Library/BaseLib.h> | |
#include <Library/BaseMemoryLib.h> | |
#include <Library/Tpm2CommandLib.h> | |
#include <Library/DebugLib.h> | |
#include <Library/BaseCryptLib.h> | |
#include <Library/MemoryAllocationLib.h> | |
#include <Library/HashLib.h> | |
/** | |
The function set SHA256 to digest list. | |
@param DigestList digest list | |
@param Sha256Digest SHA256 digest | |
**/ | |
VOID | |
Tpm2SetSha256ToDigestList ( | |
IN TPML_DIGEST_VALUES *DigestList, | |
IN UINT8 *Sha256Digest | |
) | |
{ | |
DigestList->count = 1; | |
DigestList->digests[0].hashAlg = TPM_ALG_SHA256; | |
CopyMem ( | |
DigestList->digests[0].digest.sha256, | |
Sha256Digest, | |
SHA256_DIGEST_SIZE | |
); | |
} | |
/** | |
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 | |
Sha256HashInit ( | |
OUT HASH_HANDLE *HashHandle | |
) | |
{ | |
VOID *Sha256Ctx; | |
UINTN CtxSize; | |
CtxSize = Sha256GetContextSize (); | |
Sha256Ctx = AllocatePool (CtxSize); | |
ASSERT (Sha256Ctx != NULL); | |
Sha256Init (Sha256Ctx); | |
*HashHandle = (HASH_HANDLE)Sha256Ctx; | |
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 | |
Sha256HashUpdate ( | |
IN HASH_HANDLE HashHandle, | |
IN VOID *DataToHash, | |
IN UINTN DataToHashLen | |
) | |
{ | |
VOID *Sha256Ctx; | |
Sha256Ctx = (VOID *)HashHandle; | |
Sha256Update (Sha256Ctx, DataToHash, DataToHashLen); | |
return EFI_SUCCESS; | |
} | |
/** | |
Complete hash sequence complete. | |
@param HashHandle Hash handle. | |
@param DigestList Digest list. | |
@retval EFI_SUCCESS Hash sequence complete and DigestList is returned. | |
**/ | |
EFI_STATUS | |
EFIAPI | |
Sha256HashFinal ( | |
IN HASH_HANDLE HashHandle, | |
OUT TPML_DIGEST_VALUES *DigestList | |
) | |
{ | |
UINT8 Digest[SHA256_DIGEST_SIZE]; | |
VOID *Sha256Ctx; | |
Sha256Ctx = (VOID *)HashHandle; | |
Sha256Final (Sha256Ctx, Digest); | |
FreePool (Sha256Ctx); | |
Tpm2SetSha256ToDigestList (DigestList, Digest); | |
return EFI_SUCCESS; | |
} | |
HASH_INTERFACE mSha256InternalHashInstance = { | |
HASH_ALGORITHM_SHA256_GUID, | |
Sha256HashInit, | |
Sha256HashUpdate, | |
Sha256HashFinal, | |
}; | |
/** | |
The function register SHA256 instance. | |
@retval EFI_SUCCESS SHA256 instance is registered, or system dose not surpport registr SHA256 instance | |
**/ | |
EFI_STATUS | |
EFIAPI | |
HashInstanceLibSha256Constructor ( | |
VOID | |
) | |
{ | |
EFI_STATUS Status; | |
Status = RegisterHashInterfaceLib (&mSha256InternalHashInstance); | |
if ((Status == EFI_SUCCESS) || (Status == EFI_UNSUPPORTED)) { | |
// | |
// Unsupported means platform policy does not need this instance enabled. | |
// | |
return EFI_SUCCESS; | |
} | |
return Status; | |
} |