.\" 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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.TH "Tspi_TPM_PcrRead" 3 "2004-05-25" "TSS 1.1"
.ce 1
TCG Software Stack Developer's Reference
.SH NAME
Tspi_TPM_PcrRead \- read the value in a PCR register
.SH "SYNOPSIS"
.ad l
.hy 0
.nf
.B #include <tss/platform.h>
.B #include <tss/tcpa_defines.h>
.B #include <tss/tcpa_typedef.h>
.B #include <tss/tcpa_struct.h>
.B #include <tss/tss_typedef.h>
.B #include <tss/tss_structs.h>
.B #include <tss/tspi.h>
.sp
.BI "TSS_RESULT Tspi_TPM_PcrRead(TSS_HTPM " hTPM ",              UINT32 " ulPcrIndex ","
.BI "                            UINT32*  " pulPcrValueLength ", BYTE** " prgbPcrValue ");"
.fi
.sp
.ad
.hy

.SH "DESCRIPTION"
.PP
\fBTspi_TPM_PcrRead\fR reads a PCR register to find
the current values.

.SH "PARAMETERS"
.PP
.SS hTPM
The \fIhTPM\fR parameter is used to specify the handle of the TPM
object. The command to get the TPM to test itself will be sent here.
.SS ulPcrIndex
The \fIulPcrIndex\fR parameter is the index of the PCR to read.
.SS pulPcrValueLength
The \fIpulPcrValueLength\fR parameter receives the length in bytes
of the \fIprgbPcrValue\fR parameter.
.SS prgbPcrValue
The \fIprgbPcrValue\fR parameter receives a pointer to the memory
block containing the PCR data.

.SH "RETURN CODES"
.PP
\fBTspi_TPM_PcrRead\fR returns TSS_SUCCESS on success, otherwise one
of the following values is returned:
.TP
.SM TSS_E_INVALID_HANDLE
\fIhTPM\fR is not a valid handle.

.TP
.SM TSS_E_INTERNAL_ERROR
An internal SW error has been detected.

.TP
.SM TSS_E_BAD_PARAMETER
One or more parameters is bad.

.SH "CONFORMING TO"

.PP
\fBTspi_TPM_PcrRead\fR conforms to the Trusted Computing Group Software
Specification version 1.1 Golden

.SH "SEE ALSO"

.PP
\fBTspi_TPM_PcrExtend\fR(3).