tpm2_policytemplate - Man Page

Couples a policy with public template data digest of an object.


tpm2_policytemplate [Options]


tpm2_policytemplate(1) - Couples a policy with public template data digest of an object. This is a deferred assertion where the hash of the public template data of an object is checked against the one specified in the policy.



Common Options

This collection of options are common to many programs and provide information that many users may expect.

TCTI Configuration

The TCTI or “Transmission Interface” is the communication mechanism with the TPM. TCTIs can be changed for communication with TPMs across different mediums.

To control the TCTI, the tools respect:

  1. The command line option -T or --tcti
  2. The environment variable: TPM2TOOLS_TCTI.

Note: The command line option always overrides the environment variable.

The current known TCTIs are:

The arguments to either the command line option or the environment variable are in the form:


Specifying an empty string for either the <tcti-name> or <tcti-option-config> results in the default being used for that portion respectively.

TCTI Defaults

When a TCTI is not specified, the default TCTI is searched for using dlopen(3) semantics. The tools will search for tabrmd, device and mssim TCTIs IN THAT ORDER and USE THE FIRST ONE FOUND. You can query what TCTI will be chosen as the default by using the -v option to print the version information. The “default-tcti” key-value pair will indicate which of the aforementioned TCTIs is the default.

Custom TCTIs

Any TCTI that implements the dynamic TCTI interface can be loaded. The tools internally use dlopen(3), and the raw tcti-name value is used for the lookup. Thus, this could be a path to the shared library, or a library name as understood by dlopen(3) semantics.

Tcti Options

This collection of options are used to configure the various known TCTI modules available:


Restrict the primary object type created under a hierarchy

tpm2_createprimary -C o -c prim.ctx --template-data

cat | openssl dgst -sha256 -binary -out template.hash

tpm2_startauthsession -S session.ctx -g sha256
tpm2_policytemplate -S session.ctx -L policy.template \
--template-hash template.hash
tpm2_flushcontext session.ctx

tpm2_setprimarypolicy -C o -g sha256 -L policy.template

tpm2_startauthsession -S session.ctx -g sha256 --policy-session
tpm2_policytemplate -S session.ctx --template-hash template.hash
tpm2_createprimary -C o -c prim2.ctx -P session:session.ctx
tpm2_flushcontext session.ctx


Tools can return any of the following codes:


It expects a session to be already established via tpm2_startauthsession(1) and requires one of the following:

Without it, most resource managers will not save session state between command invocations.


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tpm2-tools General Commands Manual