Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
tpm_clear(8)		    System Manager's Manual		  tpm_clear(8)

			  TPM Management - tpm_clear

NAME
       tpm_clear - return the TPM to the default state (unowned, disabled, in-
       active)

SYNOPSIS
       tpm_clear [OPTION]

DESCRIPTION
       tpm_clear requests that the system's TPM	perform	a clear	(via the
       TPM_OwnerClear API) wiping out all ownership information, in effect
       invalidaing all keys and	data tied to the TPM, as well as disabling and
       deactivating the	TPM.  This operation will prompt for the owner
       password.  The --force option relies on Phyiscal	Presence to authorize
       the command (via	the TPM_ForceClear API)	skipping the owner password
       prompt.	The TPM	OwnerClear API can be disabled until the current owner
       is cleared, requiring use of the	--force	with tpm_setclearable command.
       The TPM_ForceClear API can be disabled for the current boot cycle with
       the tpm_setclearable command.  This command requires a reboot to
       complete	the operation.

       -h, --help
	      Display command usage info.

       -v, --version
	      Display command version info.

       -l, --log [none|error|info|debug]
	      Set logging level.

       -u, --unicode
	      Use TSS UNICODE encoding for passwords to	comply with
	      applications using TSS popup boxes

       -f, --force
	      Rely on Physical Presence	for authorization; therefore, do not
	      prompt for owner password.

       -z, --well-known
	      Authenticate using 20 bytes of zeros as owner password (the
	      default TSS Well Known Secret), instead of prompting for an
	      owner password.

SEE ALSO
       tpm_version(1), tpm_takeownership(8), tpm_setclearable(8),
       tpm_setactive(8), tpm_setenable(8), tcsd(8)

REPORTING BUGS
       Report bugs to <trousers-users@lists.sourceforge.net>

TPM Management			  2005-05-05			  tpm_clear(8)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | REPORTING BUGS

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=tpm_clear&sektion=8&manpath=FreeBSD+13.0-RELEASE+and+Ports>

home | help