1 /*
2 * Copyright (c) 2010-2012 United States Government, as represented by
3 * the Secretary of Defense. All rights reserved.
4 *
5 * THIS SOFTWARE AND ITS DOCUMENTATION ARE PROVIDED AS IS AND WITHOUT
6 * ANY EXPRESS OR IMPLIED WARRANTIES WHATSOEVER. ALL WARRANTIES
7 * INCLUDING, BUT NOT LIMITED TO, PERFORMANCE, MERCHANTABILITY, FITNESS
8 * FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT ARE HEREBY
9 * DISCLAIMED. USERS ASSUME THE ENTIRE RISK AND LIABILITY OF USING THE
10 * SOFTWARE.
11 */
12
13 #include "vtpm_pcrs.h"
14 #include "vtpm_cmd.h"
15 #include "tpm/tpm_data.h"
16
17 #define PCR_VALUE tpmData.permanent.data.pcrValue
18
write_pcr_direct(unsigned int pcrIndex,uint8_t * val)19 static int write_pcr_direct(unsigned int pcrIndex, uint8_t* val) {
20 if(pcrIndex > TPM_NUM_PCR) {
21 return TPM_BADINDEX;
22 }
23 memcpy(&PCR_VALUE[pcrIndex], val, sizeof(TPM_PCRVALUE));
24 return TPM_SUCCESS;
25 }
26
vtpm_initialize_hw_pcrs(struct tpmfront_dev * tpmfront_dev,unsigned long pcrs)27 TPM_RESULT vtpm_initialize_hw_pcrs(struct tpmfront_dev* tpmfront_dev, unsigned long pcrs)
28 {
29 TPM_RESULT rc = TPM_SUCCESS;
30 uint8_t digest[sizeof(TPM_PCRVALUE)];
31
32 for(unsigned int i = 0; i < TPM_NUM_PCR; ++i) {
33 if(pcrs & 1 << i) {
34 if((rc = VTPM_PCRRead(tpmfront_dev, i, digest)) != TPM_SUCCESS) {
35 error("TPM_PCRRead failed with error : %d", rc);
36 return rc;
37 }
38 write_pcr_direct(i, digest);
39 }
40 }
41
42 return rc;
43 }
44