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, inactive)

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)