Your company here, and a link to your site. Click to find out more.

tpm2_send - Man Page

Send a raw command buffer to the TPM.


tpm2_send [Options] [STDIN]


tpm2_send(1) - Sends a TPM command to the TPM. The command is read from a file as a binary stream and transmitted to the TPM using the TCTI specified by the caller. The response received from the TPM is written to the output file.

Likely the caller will want to redirect this to a file or into a program to decode and display the response in a human readable form.



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:


Send and receive raw commands to TPM

Send the contents of tpm2-command.bin to a device and collect the response as tpm2-response.bin.

tpm2_send < tpm2-command.bin > tpm2-response.bin

tpm2_send < tpm2-command.bin -o tpm2-response.bin


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)

Referenced By


tpm2-tools General Commands Manual