1tpm_clear(8)                System Manager's Manual               tpm_clear(8)
2
3
4
5                          TPM Management - tpm_clear
6

NAME

8       tpm_clear  -  return  the  TPM to the default state (unowned, disabled,
9       inactive)
10

SYNOPSIS

12       tpm_clear [OPTION]
13
14

DESCRIPTION

16       tpm_clear requests that the system's TPM perform a clear (via the
17       TPM_OwnerClear API) wiping out all ownership information, in effect
18       invalidaing all keys and data tied to the TPM, as well as disabling and
19       deactivating the TPM.  This operation will prompt for the owner
20       password.  The --force option relies on Phyiscal Presence to authorize
21       the command (via the TPM_ForceClear API) skipping the owner password
22       prompt.  The TPM OwnerClear API can be disabled until the current owner
23       is cleared, requiring use of the --force with tpm_setclearable command.
24       The TPM_ForceClear API can be disabled for the current boot cycle with
25       the tpm_setclearable command.  This command requires a reboot to
26       complete the operation.
27
28
29       -h, --help
30              Display command usage info.
31
32       -v, --version
33              Display command version info.
34
35       -l, --log [none|error|info|debug]
36              Set logging level.
37
38       -u, --unicode
39              Use TSS UNICODE encoding for passwords to comply with
40              applications using TSS popup boxes
41
42       -f, --force
43              Rely on Physical Presence for authorization; therefore, do not
44              prompt for owner password.
45
46       -z, --well-known
47              Authenticate using 20 bytes of zeros as owner password (the
48              default TSS Well Known Secret), instead of prompting for an
49              owner password.
50
51

SEE ALSO

53       tpm_version(1), tpm_takeownership(8), tpm_setclearable(8),
54       tpm_setactive(8), tpm_setenable(8), tcsd(8)
55
56

REPORTING BUGS

58       Report bugs to <trousers-users@lists.sourceforge.net>
59
60
61
62TPM Management                    2005-05-05                      tpm_clear(8)
Impressum