TCG Software Stack Developer's Reference

NAME

Tspi_TPM_GetCapability - get information on the capabilities of 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_GetCapability(TSS_HTPM hTPM,              TSS_FLAG capArea,
                                  UINT32   ulSubCapLength,    BYTE*    rgbSubCap, 
                                  UINT32*  pulRespDataLength, BYTE**   prgbRespData);

DESCRIPTION

Tspi_TPM_GetCapability gets information on various capabilities of the TPM. This command can be used to learn how many PCRs the TPM supports, etc.

PARAMETERS

hTPM

The hTPM parameter is used to specify the handle of the TPM object.

capArea

The capArea parameter is the flag indicating the attribute to query. Possible values are:

ulSubCapLength

The ulSubCapLength parameter is the length in bytes of the rgbSubCap parameter.

rgbSubCap

The rgbSubCap parameter is the data indicating the attribute to query. Possible values are:

pulRespDataLength

The pulRespDataLength parameter is the length in bytes of the prgbRespData parameter.

prgbRespData

The prgbRespData parameter receives a pointer to the actual data of the specified attribute.

NOTES

The following Capability Areas and Sub-Capability Areas are supported by 1.1 TSS's:

TSS_TPMCAP_ORD - query whether an ordinal is supported by the TPM.
subCaps: TPM_ORD_* (see tcpa_literals.h)

TSS_TPMCAP_FLAG - query for the volatile and non-volatile flags inside the TPM. (Must be owner authorized). In this case, the 2 UINT32 values will be returned concatenated together in prgbRespData.
subCaps: ignored.

TSS_TPMCAP_ALG - query whether an algorithm is supported by the TPM.
subCaps: TSS_ALG_RSA
TSS_ALG_DES
TSS_ALG_3DES
TSS_ALG_SHA
TSS_ALG_HMAC
TSS_ALG_AES

TSS_TPMCAP_PROPERTY - query a property of the TPM.
subCaps: TSS_TPMCAP_PROP_PCR
TSS_TPMCAP_PROP_DIR
TSS_TPMCAP_PROP_MANUFACTURER
TSS_TPMCAP_PROP_SLOTS

TSS_TPMCAP_VERSION - get the TSS_VERSION structure tha identifies the TPM.
subCaps: ignored.

RETURN CODES

Tspi_TPM_GetCapability 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_GetCapability conforms to the Trusted Computing Group Software Specification version 1.1 Golden