tpmtool: Gnutls tpm tool

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

Enable debugging.

This option takes an integer number as its argument. The value of number is constrained to being:

in the range  0 through 9999

Specifies the debug level.

Input file.

Output file.

Generate an RSA private-public key pair.

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

Any generated key will be registered in the TPM.

This option must appear in combination with the following options: generate-rsa.

Any generated key will be a signing key.

This option must appear in combination with the following options: generate-rsa. This option must not appear in combination with any of the following options: legacy.

Any generated key will be a legacy key.

This option must appear in combination with the following options: generate-rsa. This option must not appear in combination with any of the following options: signing.

Any registered key will be a user key.

This option must appear in combination with the following options: register. This option must not appear in combination with any of the following options: system.

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

Any registred key will be a system key.

This option must appear in combination with the following options: register. This option must not appear in combination with any of the following options: user.

The generated key will be stored in system persistent storage.

Prints the public key of the provided key.

Lists all stored keys in the TPM.

Delete the key identified by the given URL (UUID)..

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.

Specify the number of bits for key generate.

This option takes an integer number as its argument.

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

Use DER format for output keys.

The no-outder form will disable the option.

The output will be in the TPM portable DER format.

Display usage information and exit.

Pass the extended usage information through a pager.

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.

EXAMPLES

To generate a key that is to be stored in filesystem 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 filesystem:

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

To list all keys stored in TPM use:

$ tpmtool --list

EXIT STATUS

One of the following exit values will be returned:

Successful program execution.
The operation failed or the command syntax was not valid.
libopts had an internal operational error. Please report: it to [email protected]. Thank you.

RELATED TO tpmtool…

    p11tool (1), certtool (1)

AUTHORS

Nikos Mavrogiannopoulos, Simon Josefsson and others; see /usr/share/doc/gnutls/AUTHORS for a complete list.

tpmtool (1)