tpm2_testparms(1)

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version 5.8 · 10 versions
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🎀 tpm2_testparms(1) 🎀

General Commands Manual energy, but make it bestie-core 💅

✨ NAME ✨

tpm2_testparms(1) — Verify that specified algorithm suite is supported by TPM 🫶

🌸 SYNOPSIS 🌸

tpm2_testparms [OPTIONS] [ARGUMENT]

💖 DESCRIPTION 💖

tpm2_testparms(1) — Checks that the suite specified by ALG_SPEC is available for usage per ALGORITHM.

Algorithms should follow the “formatting standards”, see section “Algorithm Specifiers”.

Also, see section “Supported Signing Schemes” for a list of supported hash algorithms. 👑

✨ OPTIONS ✨

This tool accepts no tool specific options. Literally none, bestie — it’s giving minimalist icon behavior. 💅

📚 References 📚

_(nothing listed under this heading in the source — keeping the heading anyway, no cap)_ 🫶

💖 COMMON OPTIONS 💖

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 is 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. 🛠️
  • -z, --pwd-session — Use password session instead of a HMAC session for authentication. A clear text password is passed to the TPM to authorize the action. This option can be used to avoid problems when unsalted sessions are used in OpenSSL FIPS mode. If auth values are used a salted session should be used for authentication. 🔐
  • -R, --autoflush — Enable autoflush for transient objects created by the command. If a parent object is loaded from a context file also the transient parent object will be flushed. Autoflush can also be activated if the environment variable TPM2TOOLS_AUTOFLUSH is set to yes or true. Also the page has a stray bit here: “information many users may expect.” — yes, it’s literally just sitting there 😭

🔌 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. 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 initialize 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. 🎀

🎯 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:

  • 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. 🫶

🧠 Algorithm Specifiers 🧠

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. ⭐

🌱 Simple specifiers 🌱

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. 💅

Asymmetric

  • rsa
  • ecc

Symmetric

  • aes
  • camellia
  • sm4

Hashing Algorithms

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

Keyed Hash

  • hmac
  • xor

Signing Schemes

  • rsassa
  • rsapss
  • ecdsa
  • ecdaa
  • ecschnorr
  • sm2

Asymmetric Encryption Schemes

  • oaep
  • rsaes
  • ecdh

Modes

  • ctr
  • ofb
  • cbc
  • cfb
  • ecb

Misc

  • null

🧩 Complex Specifiers 🧩

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> 🧬

🧬 Type Specifiers 🧬

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.
  • sm4 — Default SM4: sm4128
  • sm4128 or sm4_128 <mode> — 128 bit SM4 with optional mode (ctr|ofb|cbc|cfb|ecb). If mode is not specified, defaults to null.
  • ecc — Elliptical Curve, defaults to ecc256.
  • ecc192 or ecc_nist_p192 — 192 bit ECC NIST curve
  • ecc224 or ecc_nist_p224 — 224 bit ECC NIST curve
  • ecc256 or ecc_nist_p256 — 256 bit ECC NIST curve
  • ecc384 or ecc_nist_p384 — 384 bit ECC NIST curve
  • ecc521 or ecc_nist_p521 — 521 bit ECC NIST curve
  • ecc_sm2 or ecc_sm2_p256 — 256 bit SM2 curve
  • rsa — Default RSA: rsa2048
  • rsa1024 — RSA with 1024 bit keysize.
  • rsa2048 — RSA with 2048 bit keysize.
  • rsa3072 — RSA with 3072 bit keysize.
  • rsa4096 — RSA with 4096 bit keysize.

🧠 Scheme Specifiers 🧠

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. 💜

🔐 Hash Optional Scheme Specifiers 🔐

These scheme specifiers are followed by a dash and a valid hash algorithm, For example: oaep-sha256.

  • oaep
  • ecdh
  • rsassa
  • rsapss
  • ecdsa
  • ecschnorr
  • sm2

🔢 Multiple Option Scheme Specifiers 🔢

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. 💀

🚫 No Option Scheme Specifiers 🚫

This scheme specifier takes NO arguments.

  • rsaes

🧵 Symmetric Details Specifiers 🧵

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

🧪 Examples 🧪

Create an rsa2048 key with an rsaes asymmetric encryption scheme

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

Create an ecc256 key with an ecdaa signing scheme with a count of 4 and sha384 hash

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

✍️ Signature Format Specifiers ✍️

Format selection for the signature output file. tss (the default) will output a binary blob according to the TPM 2.0 specification and any potential compiler padding. The option plain will output the plain signature data as defined by the used cryptographic algorithm. 🖊️

🌟 EXAMPLES 🌟

🔍 Check whether if “rsa” is supported 🔍

tpm2_testparms rsa

🔍 Check that ECDSA using P-256 with AES-128 CTR mode is available 🔍

tpm2_testparms ecc256:ecdsa:aes128ctr

📤 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

✨ HELP ✨

ok so this is genuinely the whole section, no cap:

See the Mailing List

that's it. that's the help. the entire help is "go find the mailing list" 😭 it's giving "figure it out bestie" energy and honestly? iconic. if you're stuck, the mailing list is where the actual humans live — go say hi 🫶

🎀 License 🎀

This work is licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0).

like, share, remix, print it on a tote bag — just give credit, periodt 💅✨

and that's the whole page, bestie!! 🦋🌸

this lil masterpiece comes to you straight from tpm2-tools, and the page you're reading right now is tpm2_testparms(1) — go off and test those parms, you absolute icon 👑💖

fr fr though — every flag, every default and every path above is exactly as written. vibe check passed, facts untouched. mwah 🍓
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