Copyright (C) 2004 International Business Machines Corporation
Written by Megan Schneider based on the Trusted Computing Group Software Stack Specification Version 1.1 Golden

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1 TCG Software Stack Developer's Reference

Tspi_TPM_PcrRead - read the value in a PCR register

 #include <tss/platform.h>  #include <tss/tcpa_defines.h>  #include <tss/tcpa_typedef.h>  #include <tss/tcpa_struct.h>  #include <tss/tss_typedef.h>  #include <tss/tss_structs.h>  #include <tss/tspi.h>  "TSS_RESULT Tspi_TPM_PcrRead(TSS_HTPM " hTPM ", UINT32 " ulPcrIndex ","  " UINT32* " pulPcrValueLength ", BYTE** " prgbPcrValue ");" 

Tspi_TPM_PcrRead reads a PCR register to find the current values.

The hTPM parameter is used to specify the handle of the TPM object. The command to get the TPM to test itself will be sent here. The ulPcrIndex parameter is the index of the PCR to read. The pulPcrValueLength parameter receives the length in bytes of the prgbPcrValue parameter. The prgbPcrValue parameter receives a pointer to the memory block containing the PCR data.

Tspi_TPM_PcrRead returns TSS_SUCCESS on success, otherwise one of the following values is returned:

TSS_E_INVALID_HANDLE hTPM is not a valid handle.

TSS_E_INTERNAL_ERROR An internal SW error has been detected.

TSS_E_BAD_PARAMETER One or more parameters is bad.

Tspi_TPM_PcrRead conforms to the Trusted Computing Group Software Specification version 1.1 Golden

Tspi_TPM_PcrExtend(3).