NAME

       tss2_changeauth(1) - This command changes the authorization data of an entity referred to by the path.

SYNOPSIS

       tss2_changeauth [OPTIONS]

SEE ALSO

       fapi-config(5)  to adjust Fapi parameters like the used cryptographic profile and TCTI or directories for
       the Fapi metadata storages.

       fapi-profile(5) to determine the cryptographic algorithms and parameters for all keys and operations of a
       specific TPM interaction like the name hash algorithm, the asymmetric signature algorithm, scheme and pa‐
       rameters and PCR bank selection.

DESCRIPTION

       tss2_changeauth(1) -

OPTIONS

       These are the available options:

       • -a, --authValue=STRING:

         The new UTF-8 password.  Optional parameter.  If it is neglected then the user is queried interactively
         for a password.  To set no password, this option should be used with the empty string (““).  The  maxi‐
         mum  password  size  is  determined by the digest size of the chosen name hash algorithm in the crypto‐
         graphic profile (cf., fapi-profile(5)).  For example, choosing SHA256 as hash algorithm,  allows  pass‐
         words of a maximum size of 32 characters.

       • -p, --entityPath=STRING:

         The path identifying the entity to modify.

COMMON OPTIONS

       This  collection  of  options are common to all tss2 programs and provide information that many users may
       expect.

       • -h, --help [man|no-man]: Display the tools manpage.  By default, it attempts to invoke the manpager for
         the tool, however, on failure will output a short tool summary.  This is the same behavior if the “man”
         option argument is specified, however if explicit “man” is requested, the tool will provide errors from
         man on stderr.  If the “no-man” option if specified, or the manpager fails, the short options  will  be
         output to stdout.

         To  successfully  use  the  manpages  feature  requires the manpages to be installed or on MANPATH, See
         man(1) for more details.

       • -v, --version: Display version information for this tool, supported tctis and exit.

EXAMPLES

   Change a password for an entity HS/SRK/myRSACryptKey to M1
              tss2_changeauth --entityPath=HS/SRK/myRSACryptKey --authValue=M1

   Change a password for an entity HS/SRK/myRSACryptKey and ask the user to enter the password.
              tss2_changeauth --entityPath=HS/SRK/myRSACryptKey

RETURNS

       0 on success or 1 on failure.

BUGS

       Github Issues (https://github.com/tpm2-software/tpm2-tools/issues)

HELP

       See the Mailing List (https://lists.linuxfoundation.org/mailman/listinfo/tpm2)

tpm2-tools                                         APRIL 2019                                 tss2_changeauth(1)