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/** @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;
}
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