Clear-Tpm

NAME Clear-Tpm



SYNOPSIS

Resets a TPM to its default state.





SYNTAX

Clear-Tpm [[-OwnerAuthorization] <String>] [<CommonParameters>]



Clear-Tpm -File <String> [<CommonParameters>]





DESCRIPTION

The Clear-Tpm cmdlet resets the Trusted Platform Module (TPM) to its default state. A reset removes the owner authorization value and any keys stored in

the TPM. To reset a TPM, you must provide a valid owner authorization value. You can enter an owner authorization value or specify a file that contains

the value. If you do not provide a value, the cmdlet attempts to use a value stored in the registry.



For more information on TPM, see the Trusted Platform Module Technology Overview (http://technet.microsoft.com/en-us/libr ... 31725.aspx) in the

TechNet library.





PARAMETERS

-File <String>

Specifies a file that contains the current owner authorization value for the TPM. You can use the TPM Management Console to create this file.





Required? true

Position? named

Default value none

Accept pipeline input? false

Accept wildcard characters? false



-OwnerAuthorization [<String>]

Specifies the current owner authorization value for the TPM.



Required? false

Position? 2

Default value none

Accept pipeline input? true (ByValue)

Accept wildcard characters? false



<CommonParameters>

This cmdlet supports the common parameters: Verbose, Debug,

ErrorAction, ErrorVariable, WarningAction, WarningVariable,

OutBuffer, PipelineVariable, and OutVariable. For more information, see

about_CommonParameters (https:/go.microsoft.com/fwlink/?LinkID=113216).



INPUTS

String



This cmdlet accepts the owner authorization value for the TPM.





OUTPUTS

TpmObject



This cmdlet returns a TpmObject object contains the following information:



-- TpmReady. Whether a TPM complies with Windows Server???? 2012 standards.

-- TpmPresent. Whether there is a TMP on the current computer.

-- ManagedAuthLevel. The level at which the operating system manages the owner authorization. Possible values are Legacy, Balanced, and Full.

-- OwnerClearDisabled. Whether TPM can be reset. If this value is True, the TPM cannot be reset through the operating system by using the owner

authorization value. If this value is False, the TPM can be reset through the operating system.

-- AutoProvisioning. Whether the computer can use auto-provisioning. Possible values are NotDefined, Enabled, Disabled, and DisabledForNextBoot.

-- LockedOut. Whether a TPM is locked out.

-- SelfTest. Information returned by a test that TPM runs.





Example 1: Reset TPM



PS C:\\> Clear-Tpm

TpmReady : False

TpmPresent : True

ManagedAuthLevel : Full

OwnerAuth :

OwnerClearDisabled : True

AutoProvisioning : Disabled

LockedOut : False

SelfTest : {191, 191, 245, 191...}



This command resets the TPM. The command uses the owner authorization value stored in the registry instead of specifying a value or using a value in a

file.





Example 2: Reset TPM with a supplied authorization value



PS C:\\> Clear-Tpm -OwnerAuthorization "vjnuW6rToM41os3xxEpjLdIW2gA="

TpmReady : False

TpmPresent : True

ManagedAuthLevel : Full

OwnerAuth : OwnerClearDisabled : True

AutoProvisioning : Disabled

LockedOut : False

SelfTest : {191, 191, 245, 191...}



This command resets the TPM by using the specified owner authorization value.





Example 3: Reset TMP using authorization value from file



PS C:\\> Clear-Tpm -File "MyOwnerAuthFile.tpm"

TpmReady : False

TpmPresent : True

ManagedAuthLevel : Full

OwnerAuth :

OwnerClearDisabled : True

AutoProvisioning : Disabled

LockedOut : False

SelfTest : {191, 191, 245, 191...}



This command resets the TPM by using the owner authorization value included in the specified file.







RELATED LINKS

Online Version:

Get-Tpm

Initialize-Tpm

Unblock-Tpm