mirror of https://github.com/acidanthera/audk.git
150 lines
3.2 KiB
C
150 lines
3.2 KiB
C
/** @file
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This library is BaseCrypto SHA256 hash instance.
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It can be registered to BaseCrypto router, to serve as hash engine.
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Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved. <BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <PiPei.h>
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#include <Library/BaseLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/Tpm2CommandLib.h>
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#include <Library/DebugLib.h>
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#include <Library/BaseCryptLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/HashLib.h>
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/**
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The function set SHA256 to digest list.
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@param DigestList digest list
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@param Sha256Digest SHA256 digest
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**/
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VOID
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Tpm2SetSha256ToDigestList (
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IN TPML_DIGEST_VALUES *DigestList,
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IN UINT8 *Sha256Digest
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)
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{
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DigestList->count = 1;
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DigestList->digests[0].hashAlg = TPM_ALG_SHA256;
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CopyMem (
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DigestList->digests[0].digest.sha256,
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Sha256Digest,
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SHA256_DIGEST_SIZE
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);
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}
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/**
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Start hash sequence.
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@param HashHandle Hash handle.
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@retval EFI_SUCCESS Hash sequence start and HandleHandle returned.
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@retval EFI_OUT_OF_RESOURCES No enough resource to start hash.
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**/
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EFI_STATUS
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EFIAPI
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Sha256HashInit (
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OUT HASH_HANDLE *HashHandle
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)
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{
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VOID *Sha256Ctx;
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UINTN CtxSize;
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CtxSize = Sha256GetContextSize ();
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Sha256Ctx = AllocatePool (CtxSize);
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ASSERT (Sha256Ctx != NULL);
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Sha256Init (Sha256Ctx);
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*HashHandle = (HASH_HANDLE)Sha256Ctx;
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return EFI_SUCCESS;
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}
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/**
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Update hash sequence data.
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@param HashHandle Hash handle.
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@param DataToHash Data to be hashed.
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@param DataToHashLen Data size.
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@retval EFI_SUCCESS Hash sequence updated.
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**/
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EFI_STATUS
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EFIAPI
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Sha256HashUpdate (
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IN HASH_HANDLE HashHandle,
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IN VOID *DataToHash,
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IN UINTN DataToHashLen
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)
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{
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VOID *Sha256Ctx;
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Sha256Ctx = (VOID *)HashHandle;
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Sha256Update (Sha256Ctx, DataToHash, DataToHashLen);
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return EFI_SUCCESS;
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}
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/**
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Complete hash sequence complete.
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@param HashHandle Hash handle.
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@param DigestList Digest list.
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@retval EFI_SUCCESS Hash sequence complete and DigestList is returned.
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**/
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EFI_STATUS
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EFIAPI
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Sha256HashFinal (
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IN HASH_HANDLE HashHandle,
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OUT TPML_DIGEST_VALUES *DigestList
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)
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{
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UINT8 Digest[SHA256_DIGEST_SIZE];
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VOID *Sha256Ctx;
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Sha256Ctx = (VOID *)HashHandle;
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Sha256Final (Sha256Ctx, Digest);
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FreePool (Sha256Ctx);
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Tpm2SetSha256ToDigestList (DigestList, Digest);
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return EFI_SUCCESS;
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}
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HASH_INTERFACE mSha256InternalHashInstance = {
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HASH_ALGORITHM_SHA256_GUID,
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Sha256HashInit,
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Sha256HashUpdate,
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Sha256HashFinal,
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};
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/**
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The function register SHA256 instance.
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@retval EFI_SUCCESS SHA256 instance is registered, or system dose not surpport registr SHA256 instance
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**/
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EFI_STATUS
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EFIAPI
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HashInstanceLibSha256Constructor (
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VOID
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)
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{
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EFI_STATUS Status;
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Status = RegisterHashInterfaceLib (&mSha256InternalHashInstance);
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if ((Status == EFI_SUCCESS) || (Status == EFI_UNSUPPORTED)) {
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//
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// Unsupported means platform policy does not need this instance enabled.
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//
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return EFI_SUCCESS;
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}
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return Status;
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}
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