Your company here — click to reach over 10,000 unique daily visitors

tpm2_tr_encode - Man Page

Encodes a peristent handle and TPM2B_NAME as a serialized ESYS_TR as output.


tpm2_tr_encode [Options]


tpm2_tr_encode(1) - Encodes a peristent TPM2 handle along with a populated TPM2B_PUBLIC as a serialized ESYS_TR. This is useful for moving a public and handle from one environment where a TPM is not available to another environment with a TPM and make use of it through the ESAPI API or tpm2-tools(1).



Context Object Format

The type of a context object, whether it is a handle or file name, is determined according to the following logic in-order:

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:


Serialize a public and handle as an ESYS_TR

tpm2_createprimary -c primary.ctx
tpm2_evictcontrol -c primary.ctx -o primary.tr 0x81000002
tpm2_readpublic -c primary.tr -o primary.pub
tpm2_tr_encode -c 0x81000002 -u primary.pub -o primary2.tr


Tools can return any of the following codes:


Github Issues (https://github.com/tpm2-software/tpm2-tools/issues)


See the Mailing List (https://lists.linuxfoundation.org/mailman/listinfo/tpm2)


tpm2-tools General Commands Manual