Hi all,
I use IBM Software TPM and the last version of Trousers.
I'm practicing with PCR extension and Event Log and I'd like some
explanations.
1) How does PcrExtend() calculate the 'pcrValue' output param ?
(since starting with an empty PCR, I did expect after the first
extend that was the input data's SHA1 digest,
but evidently I'm wrong)
2) Shouldn't 'pcrEvent[0].versionInfo.bMajor' and 'bMinor' be set
to 1 and 2, respectively?
3) How does PcrExtend() calculate the 'pcrEvents[0].rgbPcrValue'
output param?
4) Is there a way to delete the whole event log?
Here is my code in summary:
UINT32 pcrValueLen;
BYTE *pcrValue;
Tspi_TPM_PcrRead(hTPM, 16, &pcrValueLen, &pcrValue);
printf("Read PCR 16");
print_ptrBYTE_as_hex("pcrValue", pcrValue, pcrValueLen);
TSS_PCR_EVENT pcrEvent;
pcrEvent.versionInfo.bMajor = (BYTE) 0x67;
pcrEvent.versionInfo.bMinor = (BYTE) 0x89;
pcrEvent.versionInfo.bRevMajor = (BYTE) 0x23;
pcrEvent.versionInfo.bRevMinor = (BYTE) 0x45;
pcrEvent.ulPcrIndex = 16;
pcrEvent.eventType = (UINT32) 9876;
pcrEvent.ulPcrValueLength = (UINT32) 0;
pcrEvent.rgbPcrValue = (BYTE *) NULL;
const char *event = "Event information";
pcrEvent.ulEventLength = (UINT32) strlen(event);
pcrEvent.rgbEvent = (BYTE *) event;
const char *data = "s";
UINT32 dataLen = strlen(data);
Tspi_TPM_PcrExtend(hTPM, pcrIndex, \
dataLen, (BYTE *)data, &pcrEvent, &pcrValueLen, &pcrValue);
printf("Extend PCR 16");
print_ptrBYTE_as_hex("pcrValue", pcrValue, pcrValueLen);
UINT32 eventNumber;
TSS_PCR_EVENT *pcrEvents;
Tspi_TPM_GetEventLog(hTPM, &eventNumber, &pcrEvents);
printf("eventNumber: %d \n", eventNumber);
for(int i=0; i < eventNumber; i++)
{
printf("\n pcrEvents[%d]: \n", i);
printf("versionInfo.bMajor: %x \n", pcrEvents[i].versionInfo.bMajor);
printf("versionInfo.bMinor: %x \n", pcrEvents[i].versionInfo.bMinor);
printf("versionInfo.bRevMajor: %x \n", \
pcrEvents[i].versionInfo.bRevMajor);
printf("versionInfo.bRevMinor: %x \n", \
pcrEvents[i].versionInfo.bRevMinor);
printf("ulPcrIndex: %d \n", pcrEvents[i].ulPcrIndex);
printf("eventType: %d \n", pcrEvents[i].eventType);
printf("ulPcrValueLength: %d \n", pcrEvents[i].ulPcrValueLength);
print_ptrBYTE_as_hex("rgbPcrValue", pcrEvents[i].rgbPcrValue, \
pcrEvents[i].ulPcrValueLength);
printf("ulEventLength: %d \n", pcrEvents[i].ulEventLength);
printf("rgbEvent: %s \n", (char *)pcrEvents[i].rgbEvent);
}
OUTPUT:
Read PCR 16
pcrValue:
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Extend PCR 16
pcrValue:
2D 87 5E 9C 9F 52 17 41 C3 0C 09 C8 79 D7 F6 5E 1A 3E AA 08
eventNumber: 1
pcrEvents[0]:
versionInfo.bMajor: 1
versionInfo.bMinor: 1
versionInfo.bRevMajor: 0
versionInfo.bRevMinor: 0
ulPcrIndex: 16
eventType: 9876
ulPcrValueLength: 20
rgbPcrValue:
A8 C6 70 D5 83 8B 7B DF 42 ED 5F 61 E8 60 52 73 94 C2 FA 5F
ulEventLength: 17
rgbEvent: Event information
---
Thank you very very much.
Max
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