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tpm2: rev155: Implement NvHashIndexData

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Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
This commit is contained in:
Stefan Berger 2019-06-11 17:13:00 -04:00 committed by Stefan Berger
parent e97ac75c95
commit c453ceec08
2 changed files with 48 additions and 4 deletions
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40
src/tpm2/NVDynamic.c
View File

@ -3,7 +3,7 @@
/* Dynamic space for user defined NV */
/* Written by Ken Goldman */
/* IBM Thomas J. Watson Research Center */
/* $Id: NVDynamic.c 1370 2018-11-02 19:39:07Z kgoldman $ */
/* $Id: NVDynamic.c 1476 2019-06-10 19:32:03Z kgoldman $ */
/* */
/* Licenses and Notices */
/* */
@ -55,7 +55,7 @@
/* arising in any way out of use or reliance upon this specification or any */
/* information herein. */
/* */
/* (c) Copyright IBM Corp. and others, 2016 - 2018 */
/* (c) Copyright IBM Corp. and others, 2016 - 2019 */
/* */
/********************************************************************************/
@ -769,6 +769,42 @@ NvGetIndexData(
}
return;
}
/* 8.4.5.7 NvHashIndexData() */
/* This function adds Index data to a hash. It does this in parts to avoid large stack buffers. */
void
NvHashIndexData(
HASH_STATE *hashState, // IN: Initialized hash state
NV_INDEX *nvIndex, // IN: Index
NV_REF locator, // IN: where the data is located
UINT32 offset, // IN: starting offset
UINT16 size // IN: amount to hash
)
{
#define BUFFER_SIZE 64
BYTE buffer[BUFFER_SIZE];
if (offset > nvIndex->publicArea.dataSize)
return;
// Make sure that we don't try to read off the end.
if ((offset + size) > nvIndex->publicArea.dataSize)
size = nvIndex->publicArea.dataSize - (UINT16)offset;
#if BUFFER_SIZE >= MAX_NV_INDEX_SIZE
NvGetIndexData(nvIndex, locator, offset, size, buffer);
CryptDigestUpdate(hashState, size, buffer);
#else
{
INT16 i;
UINT16 readSize;
//
for (i = size; i > 0; offset += readSize, i -= readSize)
{
readSize = (i < BUFFER_SIZE) ? i : BUFFER_SIZE;
NvGetIndexData(nvIndex, locator, offset, readSize, buffer);
CryptDigestUpdate(hashState, readSize, buffer);
}
}
#endif // BUFFER_SIZE >= MAX_NV_INDEX_SIZE
#undef BUFFER_SIZE
}
/* 8.4.5.7 NvGetUINT64Data() */
/* Get data in integer format of a bit or counter NV Index. */
/* This function requires that the NV Index is defined and that the NV Index previously has been

12
src/tpm2/NVDynamic_fp.h
View File

@ -3,7 +3,7 @@
/* Dynamic space for user defined NV */
/* Written by Ken Goldman */
/* IBM Thomas J. Watson Research Center */
/* $Id: NVDynamic_fp.h 1047 2017-07-20 18:27:34Z kgoldman $ */
/* $Id: NVDynamic_fp.h 1476 2019-06-10 19:32:03Z kgoldman $ */
/* */
/* Licenses and Notices */
/* */
@ -55,7 +55,7 @@
/* arising in any way out of use or reliance upon this specification or any */
/* information herein. */
/* */
/* (c) Copyright IBM Corp. and others, 2016, 2017 */
/* (c) Copyright IBM Corp. and others, 2016 - 2019 */
/* */
/********************************************************************************/
@ -113,6 +113,14 @@ NvGetIndexData(
UINT16 size, // IN: size of NV data
void *data // OUT: data buffer
);
void
NvHashIndexData(
HASH_STATE *hashState, // IN: Initialized hash state
NV_INDEX *nvIndex, // IN: Index
NV_REF locator, // IN: where the data is located
UINT32 offset, // IN: starting offset
UINT16 size // IN: amount to hash
);
UINT64
NvGetUINT64Data(
NV_INDEX *nvIndex, // IN: the in RAM index descriptor