.\" 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_GetRandom" 3 "2004-05-25" "TSS 1.1"
.ce 1
TCG Software Stack Developer's Reference
.SH NAME
Tspi_TPM_GetRandom \- generate a random number on the TPM
.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_GetRandom(TSS_HTPM " hTPM ", UINT32 " size ", BYTE** " random ");"
.fi
.ad
.hy

.SH "DESCRIPTION"
.PP
\fBTspi_TPM_GetRandom\fR gets a good random number
for the purpose of generating symmetric keys, nonces, or
seeding a random number generator.

.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 size
The \fIsize\fR parameter is the number of random bytes requested.
.SS random
The \fIrandom\fR parameter is a pointer to memory containing the random
data. This is where the generated number goes. Because this internally
allocates memory, Tspi_Context_FreeMemory should also be used.

.SH "RETURN CODES"
.PP
\fBTspi_TPM_GetRandom\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_GetRandom\fR conforms to the Trusted Computing Group
Software Specification version 1.1 Golden

.SH "SEE ALSO"

.PP
\fBTspi_Context_FreeMemory\fR(3).