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/** @file
Ihis library is BaseCrypto router. It will redirect hash request to each individual
hash handler registerd, such as SHA1, SHA256.
Platform can use PcdTpm2HashMask to mask some hash engines.
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/MemoryAllocationLib.h>
#include <Library/PcdLib.h>
#include <Library/HashLib.h>
#include "HashLibBaseCryptoRouterCommon.h"
HASH_INTERFACE mHashInterface[HASH_COUNT] = {0};
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;
UINTN Index;
if (mHashInterfaceCount == 0) {
return EFI_UNSUPPORTED;
}
HashCtx = AllocatePool (sizeof(*HashCtx) * mHashInterfaceCount);
ASSERT (HashCtx != NULL);
for (Index = 0; Index < mHashInterfaceCount; Index++) {
mHashInterface[Index].HashInit (&HashCtx[Index]);
}
*HashHandle = (HASH_HANDLE)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
)
{
HASH_HANDLE *HashCtx;
UINTN Index;
if (mHashInterfaceCount == 0) {
return EFI_UNSUPPORTED;
}
HashCtx = (HASH_HANDLE *)HashHandle;
for (Index = 0; Index < mHashInterfaceCount; Index++) {
mHashInterface[Index].HashUpdate (HashCtx[Index], 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;
HASH_HANDLE *HashCtx;
UINTN Index;
EFI_STATUS Status;
if (mHashInterfaceCount == 0) {
return EFI_UNSUPPORTED;
}
HashCtx = (HASH_HANDLE *)HashHandle;
ZeroMem (DigestList, sizeof(*DigestList));
for (Index = 0; Index < mHashInterfaceCount; Index++) {
mHashInterface[Index].HashUpdate (HashCtx[Index], DataToHash, DataToHashLen);
mHashInterface[Index].HashFinal (HashCtx[Index], &Digest);
Tpm2SetHashToDigestList (DigestList, &Digest);
}
FreePool (HashCtx);
Status = Tpm2PcrExtend (
PcrIndex,
DigestList
);
return Status;
}
/**
Hash data and extend to PCR.
@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) {
return EFI_UNSUPPORTED;
}
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
)
{
UINTN Index;
UINT32 HashMask;
//
// Check allow
//
HashMask = Tpm2GetHashMaskFromAlgo (&HashInterface->HashGuid);
if ((HashMask & PcdGet32 (PcdTpm2HashMask)) == 0) {
return EFI_UNSUPPORTED;
}
if (mHashInterfaceCount >= sizeof(mHashInterface)/sizeof(mHashInterface[0])) {
return EFI_OUT_OF_RESOURCES;
}
//
// Check duplication
//
for (Index = 0; Index < mHashInterfaceCount; Index++) {
if (CompareGuid (&mHashInterface[Index].HashGuid, &HashInterface->HashGuid)) {
return EFI_ALREADY_STARTED;
}
}
CopyMem (&mHashInterface[mHashInterfaceCount], HashInterface, sizeof(*HashInterface));
mHashInterfaceCount ++;
return EFI_SUCCESS;
}
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