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/********************************************************************************/
/* */
/* Marshalling and unmarshalling of state */
/* Written by Stefan Berger */
/* IBM Thomas J. Watson Research Center */
/* */
/* (c) Copyright IBM Corporation 2017,2018. */
/* */
/* All rights reserved. */
/* */
/* Redistribution and use in source and binary forms, with or without */
/* modification, are permitted provided that the following conditions are */
/* met: */
/* */
/* Redistributions of source code must retain the above copyright notice, */
/* this list of conditions and the following disclaimer. */
/* */
/* Redistributions in binary form must reproduce the above copyright */
/* notice, this list of conditions and the following disclaimer in the */
/* documentation and/or other materials provided with the distribution. */
/* */
/* Neither the names of the IBM Corporation nor the names of its */
/* contributors may be used to endorse or promote products derived from */
/* this software without specific prior written permission. */
/* */
/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS */
/* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT */
/* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR */
/* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT */
/* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT */
/* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, */
/* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY */
/* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT */
/* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE */
/* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/********************************************************************************/
#if defined __FreeBSD__ || defined __DragonFly__
# include <sys/endian.h>
#elif defined __APPLE__
# include <libkern/OSByteOrder.h>
#else
# include <endian.h>
#endif
#include <string.h>
#include "config.h"
#include "assert.h"
#include "NVMarshal.h"
#include "Volatile.h"
#define TPM_HAVE_TPM2_DECLARATIONS
#include "tpm_library_intern.h"
TPM_RC
VolatileState_Load(BYTE **buffer, INT32 *size)
{
TPM_RC rc = TPM_RC_SUCCESS;
BYTE hash[SHA1_DIGEST_SIZE], acthash[SHA1_DIGEST_SIZE];
UINT16 hashAlg = TPM_ALG_SHA1;
if (rc == TPM_RC_SUCCESS) {
if ((UINT32)*size < sizeof(hash))
return TPM_RC_INSUFFICIENT;
CryptHashBlock(hashAlg, *size - sizeof(hash), *buffer,
sizeof(acthash), acthash);
rc = VolatileState_Unmarshal(buffer, size);
/* specific error has already been reported */
}
if (rc == TPM_RC_SUCCESS) {
/*
* advance pointer towards hash if we have a later version of
* the state that has extra data we didn't read
*/
if (*size > 0 && (UINT32)*size > sizeof(hash)) {
*buffer += *size - sizeof(hash);
*size = sizeof(hash);
}
rc = Array_Unmarshal(hash, sizeof(hash), buffer, size);
if (rc != TPM_RC_SUCCESS)
TPMLIB_LogTPM2Error("Error unmarshalling volatile state hash: "
"0x%02x\n", rc);
}
if (rc == TPM_RC_SUCCESS) {
if (memcmp(acthash, hash, sizeof(hash))) {
rc = TPM_RC_HASH;
TPMLIB_LogTPM2Error("Volatile state checksum error: 0x%02x\n",
rc);
}
}
if (rc != TPM_RC_SUCCESS)
g_inFailureMode = TRUE;
return rc;
}
UINT16
VolatileState_Save(BYTE **buffer, INT32 *size)
{
UINT16 written;
const BYTE *start;
BYTE hash[SHA1_DIGEST_SIZE];
TPM_ALG_ID hashAlg = TPM_ALG_SHA1;
start = *buffer;
written = VolatileState_Marshal(buffer, size);
/* append the checksum */
CryptHashBlock(hashAlg, written, start, sizeof(hash), hash);
written += Array_Marshal(hash, sizeof(hash), buffer, size);
return written;
}
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