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/** @file
This library is BaseCrypto SHA256 hash instance.
It can be registered to BaseCrypto router, to serve as hash engine.
Copyright (c) 2013 - 2018, 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/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 does not support register 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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