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Option-unification.md

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Proposed option unification

GOAL: short options should be consistent in the type of value they expect. This may not be possible for the entire tools suite, but should at least be achieved for the groups of tools mapping to the command groups in Part 3 of the TPM spec

This work is currently in progress

Current options

The options as of ~3.0.3+ / commit 60768ba are documented in a separate wiki page: [[3.0.x-options-matrix]].

Command groups

Short options should be common in their argument values and purpose across all tools in a group.

  • Start-up: tpm2_startup
  • Session: tpm2_startauthsession, tpm2_policyrestart
  • Object: tpm2_create, tpm2_createprimary, tpm2_changeauth, tpm2_load, tpm2_loadexternal, tpm2_readpublic, tpm2_activatecredential, tpm2_makecredential, tpm2_unseal
  • Duplication: tpm2_import
  • Asymmetric primitives: tpm2_rsaencrypt, tpm2_rsadecrypt
  • Symmetric primitives: tpm2_encryptdecrypt, tpm2_hash, tpm2_hmac
  • Random number generator: tpm2_getrandom
  • Attestation: tpm2_certify, tpm2_quote
  • Signing and signature verification: tpm2_sign, tpm2_verifysignature
  • Integrity: tpm2_pcrextend, tpm2_pcrevent, tpm2_pcrlist
  • Enhanced authorisation (EA): tpm2_policypcr, tpm2_createpolicy
  • Hierarchy commands: tpm2_clear, tpm2_clearlock
  • Dictionary attack: tpm2_dictionarylockout
  • Context management: tpm2_flushcontext, tpm2_evictcontrol
  • Capability commands: tpm2_getcap
  • Non-volatile storage: tpm2_nvdefine, tpm2_nvlist, tpm2_nvread, tpm2_nvreadlock, tpm2_nvrelease, tpm2_nvwrite

Common tool options

Standard options

Options which, in their short form, are common across all tools (same short option expects same argument type). These remain the same as 3.0.x versions of the tools.

Short form Argument type Details
-h None help
-Q None quiet
-T TCTI options -
-v None version
-V None verbose
-Z None enable errata fixups

Parent and current object

When tools take a parent and/or current object we can simplify the options by having -C always be the parent object and -c the child object.

The method tpm2_util_object_load is used to parse an option argument value string and populate a tpm2_loaded_object with a parsed path and/or handle. The argument value string will recognised as a context file when prefixed with "file:" or should the value not be parsable as a handle number (as understood by strtoul()). For example:

0x1234 - specifies a handle
foo.dat - specifies a context file
file:0x1234 - specifies a context file
Short form Argument type Details
-c handle id or context file path child/current object
-C handle id or context file path parent object

Object authorization

When objects require an authorization value we use -P to supply the authorization value for any parent object and -p to supply the authorization value for the current/child object.

Short form Argument type Details
-p authorization value authorization for child/current object
-P authorization value authorization for parent object

Algorithm

When tools take algorithm specifiers as arguments the -g and -G short options will be used.-g should always specify the name algorithm whilst -G should be object/type algorithm.

Short form Argument type Details
-g algorithm type specifier (see Algorithm Specifiers) name alg
-G algorithm type specifier (see Algorithm Specifiers) object type/alg