TCG Software Stack Developer's Reference

NAME

Tspi_TPM_GetPubEndorsementKey - create a TSS key object from the TPM's public endorsement key

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_GetPubEndorsementKey(TSS_HTPM        hTPM,            TSS_BOOL  fOwnerAuthorized,
                                         TSS_VALIDATION* pValidationData, TSS_HKEY* phEndorsementPubKey);

DESCRIPTION

Tspi_TPM_GetPubEndorsementKey This function retrieves the public endorsement key (PubEK) from the TPM and creates a TSS key object for it, whose handle is returned in phEndorsementPubKey. Due to the fact that different TPM chips validate the PubEK in different ways, application verification of the PubEK (using a non-NULL pValidationData is broken. Tspi_TPM_GetPubEndorsementKey should be called with a NULL pValidationData parameter to allow the TSS to verify the PubEK itself.

PARAMETERS

hTPM

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

fOwnerAuthorized

If TRUE, the TPM owner secret must be provided to get the public endorsement key. If FALSE, no TPM owner secret must be provided to get the public endorsement key.

pValidationData

If non-NULL, the application should set the pValidationData->rgbExternalData parameter to 20 bytes of random data before calling Tspi_TPM_GetPubEndorsementKey. On successful completion of the command, the structure will provide buffers containing the validation data and the buffer the validation data was computed from.

phEndorsementPubKey

Receives a handle to a key object representing the TPM's public endorsement key.

RETURN CODES

Tspi_TPM_GetPubEndorsementKey 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.
TPM_E_DISABLED_CMD: Reading of PubEK from TPM has been disabled.

CONFORMING TO

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