tpm2_policynamehash - Man Page

Couples a policy with names of specific objects.


tpm2_policynamehash [Options]


tpm2_policynamehash(1) - Couples a policy with names of specific objects. This is a deferred assertion where the hash of the names of all object handles in a TPM command 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 key duplication to specific new parent and specific duplicable key.

Generate a duplicable object

openssl genrsa -out signing_key_private.pem 2048

openssl rsa -in signing_key_private.pem -out signing_key_public.pem -pubout

tpm2_loadexternal -G rsa -C o -u signing_key_public.pem -c signing_key.ctx \

tpm2_startauthsession -S session.ctx -g sha256

tpm2_policyauthorize -S session.ctx -L authorized.policy -n

tpm2_policycommandcode -S session.ctx -L policy.dat TPM2_CC_Duplicate

tpm2_flushcontext session.ctx

tpm2_createprimary -C o -g sha256 -G rsa -c primary.ctx -Q

## The duplicable key
tpm2_create -Q -C primary.ctx -g sha256 -G rsa -r key.prv -u \
-L policy.dat -a "sensitivedataorigin|sign|decrypt"

tpm2_load -Q -C primary.ctx -r key.prv -u -c key.ctx

Create the new parent

tpm2_create -Q -C primary.ctx -g sha256 -G rsa -r new_parent.prv \
-u \
-a "decrypt|fixedparent|fixedtpm|restricted|sensitivedataorigin"

tpm2_loadexternal -Q -C o -u -c new_parent.ctx

Modify the duplicable key policy to namehash policy to restrict

parent and key

tpm2_readpublic -Q -c new_parent.ctx -n

tpm2_readpublic -Q -c key.ctx -n

cat | openssl dgst -sha256 -binary > name.hash

tpm2_startauthsession -S session.ctx -g sha256

tpm2_policynamehash -L policy.namehash -S session.ctx -n name.hash

tpm2_flushcontext session.ctx

openssl dgst -sha256 -sign signing_key_private.pem \
-out policynamehash.signature policy.namehash

tpm2_startauthsession -S session.ctx -g sha256

tpm2_policyauthorize -S session.ctx -L authorized.policy -i policy.namehash \

tpm2_policycommandcode -S session.ctx -L policy.dat TPM2_CC_Duplicate

tpm2_flushcontext session.ctx

Satisfy the policy and attempt key duplication

tpm2_verifysignature -c signing_key.ctx -g sha256 -m policy.namehash \
-s policynamehash.signature -t verification.tkt -f rsassa

tpm2_startauthsession -S session.ctx --policy-session -g sha256

tpm2_policynamehash -S session.ctx -n name.hash

tpm2_policyauthorize -S session.ctx -i policy.namehash -n \
-t verification.tkt

tpm2_policycommandcode -S session.ctx TPM2_CC_Duplicate

tpm2_duplicate -C new_parent.ctx -c key.ctx -G null -p "session:session.ctx" \
-r dupprv.bin -s dupseed.dat

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