TCG Software Stack Developer's Reference

NAME

Tspi_TPM_GetRandom - generate a random number on the TPM

SYNOPSIS

#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_GetRandom(TSS_HTPM hTPM, UINT32 size, BYTE** random);

DESCRIPTION

Tspi_TPM_GetRandom gets a good random number for the purpose of generating symmetric keys, nonces, or seeding a random number generator.

PARAMETERS

hTPM

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.

size

The size parameter is the number of random bytes requested.

The random 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.

RETURN CODES

Tspi_TPM_GetRandom 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.

CONFORMING TO

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