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Man Pages
tpm2_incrementalselftest(1) General Commands Manual tpm2_incrementalselftest(1)

tpm2_incrementalselftest(1) - Request testing of specified algorithm list

tpm2_incrementalselftest [OPTIONS] ALG_SPEC_LIST

tpm2_incrementalselftest(1) Request the TPM to perform testing on specified algorithm and print a list of algorithm scheduled to be tested OR remain to be tested but not scheduled.

The main interest of this command is to reduce delays that might occur on cryptographic operations as TPM must test the algorithm prior using it.

A space-separated list of algorithm suite to be tested. Algorithms should follow the “formatting standards”, see section “Algorithm Specifiers”. Also, see section “Supported Hash Algorithms” for a list of supported hash algorithms.

If ALG_SPEC_LIST is left empty, tpm2_incrementalselftest(1) will return the list of algorithms left to be tested. Please note that in this case these algorithms are NOT scheduled to be tested.

If ALG_SPEC_LIST is not empty, tpm2_incrementalselftest(1) will return the list of algorithms that remains to be tested. This list contains algorithms scheduled for testing AND algorithms that remains to be tested and not yet scheduled. This can occur for instance if all AES mode have not been already tested yet.

List of algorithms to be tested (implying scheduled) or remain to be tested (not scheduled) is also printed in YAML format.

If none of the specified algorithm is printed, that means both that they are already tested AND that these algorithms won’t be tested again.

This tool accepts no tool specific options.

Options that take algorithms support “nice-names”.

There are two major algorithm specification string classes, simple and complex. Only certain algorithms will be accepted by the TPM, based on usage and conditions.

These are strings with no additional specification data. When creating objects, non-specified portions of an object are assumed to defaults. You can find the list of known “Simple Specifiers Below”.

•
rsa
•
ecc

•
aes
•
camellia

•
sha1
•
sha256
•
sha384
•
sha512
•
sm3_256
•
sha3_256
•
sha3_384
•
sha3_512

•
hmac
•
xor

•
rsassa
•
rsapss
•
ecdsa
•
ecdaa
•
ecschnorr

•
oaep
•
rsaes
•
ecdh

•
ctr
•
ofb
•
cbc
•
cfb
•
ecb

•
null

Objects, when specified for creation by the TPM, have numerous algorithms to populate in the public data. Things like type, scheme and asymmetric details, key size, etc. Below is the general format for specifying this data: <type>:<scheme>:<symmetric-details>

This portion of the complex algorithm specifier is required. The remaining scheme and symmetric details will default based on the type specified and the type of the object being created.
•
aes - Default AES: aes128
•
aes128<mode> - 128 bit AES with optional mode (ctr|ofb|cbc|cfb|ecb). If mode is not specified, defaults to null.
•
aes192<mode> - Same as aes128<mode>, except for a 192 bit key size.
•
aes256<mode> - Same as aes128<mode>, except for a 256 bit key size.
•
ecc - Elliptical Curve, defaults to ecc256.
•
ecc192 - 192 bit ECC
•
ecc224 - 224 bit ECC
•
ecc256 - 256 bit ECC
•
ecc384 - 384 bit ECC
•
ecc521 - 521 bit ECC
•
rsa - Default RSA: rsa2048
•
rsa1024 - RSA with 1024 bit keysize.
•
rsa2048 - RSA with 2048 bit keysize.
•
rsa4096 - RSA with 4096 bit keysize.

Next, is an optional field, it can be skipped.

Schemes are usually Signing Schemes or Asymmetric Encryption Schemes. Most signing schemes take a hash algorithm directly following the signing scheme. If the hash algorithm is missing, it defaults to sha256. Some take no arguments, and some take multiple arguments.

These scheme specifiers are followed by a dash and a valid hash algorithm, For example: oaep-sha256.
•
oaep
•
ecdh
•
rsassa
•
rsapss
•
ecdsa
•
ecschnorr

This scheme specifier is followed by a count (max size UINT16) then followed by a dash(-) and a valid hash algorithm. * ecdaa For example, ecdaa4-sha256. If no count is specified, it defaults to 4.

This scheme specifier takes NO arguments. * rsaes

This field is optional, and defaults based on the type of object being created and it’s attributes. Generally, any valid Symmetric specifier from the Type Specifiers list should work. If not specified, an asymmetric objects symmetric details defaults to aes128cfb.

tpm2_create -C parent.ctx -G rsa2048:rsaes -u key.pub -r key.priv

/tpm2_create -C parent.ctx -G ecc256:ecdaa4-sha384 -u key.pub -r key.priv cryptographic algorithms ALGORITHM.

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

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 support not using a TCTI. Tools that do not support it will error when attempted to be used without a TCTI 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 being used for that portion respectively.

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.

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.

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 separated 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.


tpm2_incrementalselftest rsa

    


tpm2_incrementalselftest rsa ecc xor aes cbc

Algorithm suite specified can imply either testing the combination or the complete suite, depending on TPM manufacturer implementation.

e.g : One TPM might only test AES with CTR mode if “aes ctr” is specified. An other might also test complete AES mode list AND test ctr mode.

If an algorithm has already been tested, this command won’t permit re-executing the test. Only issuing tpm2_selftest(1) in full-test mode enabled will force re-testing.

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.

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

See the Mailing List (https://lists.01.org/mailman/listinfo/tpm2)
tpm2-tools
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