Provided by: tpm2-tools_5.6-1build4_amd64 
NAME
tpm2(1) - A single small executable that combines the various tpm2-tools much like a BusyBox that pro‐
vides a fairly complete environment for any small or embedded system.
SYNOPSIS
tpm2 [OPTIONS] [ARGUMENTS]
DESCRIPTION
tpm2(1) - To ease installation of tpm2-tools in initrd or embedded systems where size-optimization and
limited resources are important, it is convenient to have a single executable that can dispatch the vari‐
ous TPM2 functionalities specified by the argument which is one of the available tool names.
The options and arguments that follow are either the common options or those specific to the tool name.
It is important to note that individual tools with prefix tpm2_ can still be invoked, however, they are
now soft-linked to this tpm2 executable. And so unlike BusyBox, full functionality of the individual
tools is available in the executable. For example: tpm2_getrandom 8 can alternatively be specified as
tpm2 getrandom 8.
ARGUMENTS
List of possible tool names. NOTE: Specify only one of these. Look at examples.
certifyX509certutil
checkquote
eventlog
print
rc_decode
activatecredential
certify
changeauth
changeeps
changepps
clear
clearcontrol
clockrateadjust
create
createak
createek
createpolicy
setprimarypolicy
createprimary
dictionarylockout
duplicate
getcap
gettestresult
encryptdecrypt
evictcontrol
flushcontext
getekcertificate
getrandom
gettime
hash
hierarchycontrol
hmac
import
incrementalselftest
load
loadexternal
makecredential
nvdefine
nvextend
nvincrement
nvreadpublic
nvread
nvreadlock
nvundefine
nvwrite
nvwritelock
nvsetbits
pcrallocate
pcrevent
pcrextend
pcrread
pcrreset
policypcr
policyauthorize
policyauthorizenv
policynv
policycountertimer
policyor
policynamehash
policytemplate
policycphash
policypassword
policysigned
policyticket
policyauthvalue
policysecret
policyrestart
policycommandcode
policynvwritten
policyduplicationselect
policylocality
quote
readclock
readpublic
rsadecrypt
rsaencrypt
send
selftest
sessionconfig
setclock
shutdown
sign
certifycreation
nvcertify
startauthsession
startup
stirrandom
testparms
unseal
verifysignature
setcommandauditstatus
getcommandauditdigest
getsessionauditdigest
geteccparameters
ecephemeral
commit
ecdhkeygen
ecdhzgen
zgen2phase
References
COMMON OPTIONS
This collection of options are common to many programs and provide information that many users may ex‐
pect.
• -h, --help=[man|no-man]: Display the tools manpage. By default, it attempts to invoke the manpager for
the tool, however, on failure will output a short tool summary. This is the same behavior if the “man”
option argument is specified, however if explicit “man” is requested, the tool will provide errors from
man on stderr. If the “no-man” option if specified, or the manpager fails, the short options will be
output to stdout.
To successfully use the manpages feature requires the manpages to be installed or on MANPATH, See
man(1) for more details.
• -v, --version: Display version information for this tool, supported tctis and exit.
• -V, --verbose: Increase the information that the tool prints to the console during its execution. When
using this option the file and line number are printed.
• -Q, --quiet: Silence normal tool output to stdout.
• -Z, --enable-errata: Enable the application of errata fixups. Useful if an errata fixup needs to be
applied to commands sent to the TPM. Defining the environment TPM2TOOLS_ENABLE_ERRATA is equivalent.
information 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:
• tabrmd - The resource manager, called tabrmd (https://github.com/tpm2-software/tpm2-abrmd). Note that
tabrmd and abrmd as a tcti name are synonymous.
• mssim - Typically used for communicating to the TPM software simulator.
• device - Used when talking directly to a TPM device file.
• none - Do not initalize a connection with the TPM. Some tools allow for off-tpm options and thus sup‐
port not using a TCTI. Tools that do not support it will error when attempted to be used without a TC‐
TI connection. Does not support ANY options and MUST BE presented as the exact text of “none”.
The arguments to either the command line option or the environment variable are in the form:
<tcti-name>:<tcti-option-config>
Specifying an empty string for either the <tcti-name> or <tcti-option-config> results in the default be‐
ing 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 “de‐
fault-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:
• device: For the device TCTI, the TPM character device file for use by the device TCTI can be specified.
The default is /dev/tpm0.
Example: -T device:/dev/tpm0 or export TPM2TOOLS_TCTI=“device:/dev/tpm0”
• mssim: For the mssim TCTI, the domain name or IP address and port number used by the simulator can be
specified. The default are 127.0.0.1 and 2321.
Example: -T mssim:host=localhost,port=2321 or export TPM2TOOLS_TCTI=“mssim:host=localhost,port=2321”
• abrmd: For the abrmd TCTI, the configuration string format is a series of simple key value pairs sepa‐
rated by a `,' character. Each key and value string are separated by a `=' character.
• TCTI abrmd supports two keys:
1. `bus_name' : The name of the tabrmd service on the bus (a string).
2. `bus_type' : The type of the dbus instance (a string) limited to `session' and `system'.
Specify the tabrmd tcti name and a config string of bus_name=com.example.FooBar:
\--tcti=tabrmd:bus_name=com.example.FooBar
Specify the default (abrmd) tcti and a config string of bus_type=session:
\--tcti:bus_type=session
NOTE: abrmd and tabrmd are synonymous. the various known TCTI modules.
EXAMPLES
Get 8 rand bytes from the TPM
tpm2 getrandom 8 | xxd -p
Send a TPM Startup Command with flags TPM2_SU_CLEAR
tpm2 startup -c
Returns
Tools can return any of the following codes:
• 0 - Success.
• 1 - General non-specific error.
• 2 - Options handling error.
• 3 - Authentication error.
• 4 - TCTI related error.
• 5 - Non supported scheme. Applicable to tpm2_testparams.
BUGS
Github Issues (https://github.com/tpm2-software/tpm2-tools/issues)
HELP
See the Mailing List (https://lists.linuxfoundation.org/mailman/listinfo/tpm2)
tpm2-tools tpm2(1)