tpmtool - GnuTLS TPM tool

NAME SYNOPSIS DESCRIPTION OPTIONS EXAMPLES EXIT STATUS SEE ALSO AUTHORS COPYRIGHT BUGS

SYNOPSIS

tpmtool [−flags] [−flag [value]] [−−option-name[[=| ]value]]

All arguments must be options.

DESCRIPTION

Program that allows handling cryptographic data from the TPM chip.

OPTIONS

−d num, −−debug=num Enable debugging. This option takes an integer
number as its argument. The value of num is constrained to being:

in the range 0 through 9999

Specifies the debug level.

−−infile=file Input file.

−−outfile=str Output file.

−−generate−rsa Generate an RSA private-public key pair.

Generates an RSA private−public key pair in the TPM chip. The key may
be stored in file system and protected by a PIN, or stored (registered)
in the TPM chip flash.

−−register Any generated key will be registered in the TPM. This
option must appear in combination with the following options:
generate-rsa.

−−signing Any generated key will be a signing key. This option must
not appear in combination with any of the following options: legacy.
This option must appear in combination with the following options:
generate-rsa.

−−legacy Any generated key will be a legacy key. This option must not
appear in combination with any of the following options: signing. This
option must appear in combination with the following options:
generate-rsa.

−−user Any registered key will be a user key. This option must not
appear in combination with any of the following options: system. This
option must appear in combination with the following options: register.

The generated key will be stored in a user specific persistent storage.

−−system Any registered key will be a system key. This option must not
appear in combination with any of the following options: user. This
option must appear in combination with the following options: register.

The generated key will be stored in system persistent storage.

−−pubkey=url Prints the public key of the provided key.

−−list Lists all stored keys in the TPM.

−−delete=url Delete the key identified by the given URL (UUID).

−−test−sign=url Tests the signature operation of the provided object.

It can be used to test the correct operation of the signature
operation. This operation will sign and verify the signed data.

−−sec−param=security parameter Specify the security level [low, legacy,
medium, high, ultra].

This is alternative to the bits option. Note however that the values
allowed by the TPM chip are quantized and given values may be rounded
up.

−−bits=num Specify the number of bits for key generate. This option
takes an integer number as its argument.

−−inder, −−no−inder Use the DER format for keys. The no−inder form
will disable the option.

The input files will be assumed to be in the portable DER format of
TPM. The default format is a custom format used by various TPM tools

−−outder, −−no−outder Use DER format for output keys. The no−outder
form will disable the option.

The output will be in the TPM portable DER format.

−−srk−well−known SRK has well known password (20 bytes of zeros).

−v arg, −−version=arg Output version of program and exit. The default
mode is ‘v’, a simple version. The ‘c’ mode will print copyright
information and ‘n’ will print the full copyright notice.

−h, −−help Display usage information and exit.

−!, −−more−help Pass the extended usage information through a pager.

EXAMPLES

To generate a key that is to be stored in file system use:

$ tpmtool −−generate−rsa −−bits 2048 −−outfile tpmkey.pem

To generate a key that is to be stored in TPM’s flash use:

$ tpmtool −−generate−rsa −−bits 2048 −−register −−user

To get the public key of a TPM key use:

$ tpmtool −−pubkey tpmkey:uuid=58ad734b−bde6−45c7−89d8−756a55ad1891;storage=user −−outfile pubkey.pem

or if the key is stored in the file system:

$ tpmtool −−pubkey tpmkey:file=tmpkey.pem −−outfile pubkey.pem

To list all keys stored in TPM use:

$ tpmtool −−list