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.TH "tss2_changeauth" "1" "APRIL 2019" "tpm2\-tools" "General Commands Manual"
.SH NAME
\f[B]tss2_changeauth\f[R](1) \- This command changes the authorization
data of an entity referred to by the path.
.SH SYNOPSIS
\f[B]tss2_changeauth\f[R] [\f[I]OPTIONS\f[R]]
.SH SEE ALSO
\f[B]fapi\-config(5)\f[R] to adjust Fapi parameters like the used
cryptographic profile and TCTI or directories for the Fapi metadata
storages.
.PP
\f[B]fapi\-profile(5)\f[R] 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 parameters and PCR bank selection.
.SH DESCRIPTION
\f[B]tss2_changeauth\f[R](1) \-
.SH OPTIONS
These are the available options:
.IP \[bu] 2
\f[B]\-a\f[R], \f[B]\-\-authValue\f[R]=\f[I]STRING\f[R]:
.RS 2
.PP
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
(\[lq]\[lq]).
The maximum password size is determined by the digest size of the chosen
name hash algorithm in the cryptographic profile (cf.,
\f[B]fapi\-profile(5)\f[R]).
For example, choosing SHA256 as hash algorithm, allows passwords of a
maximum size of 32 characters.
.RE
.IP \[bu] 2
\f[B]\-p\f[R], \f[B]\-\-entityPath\f[R]=\f[I]STRING\f[R]:
.RS 2
.PP
The path identifying the entity to modify.
.RE
.SH COMMON OPTIONS
This collection of options are common to all tss2 programs and provide
information that many users may expect.
.IP \[bu] 2
\f[B]\-h\f[R], \f[B]\-\-help [man|no\-man]\f[R]: 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 \[lq]man\[rq] option argument is
specified, however if explicit \[lq]man\[rq] is requested, the tool will
provide errors from man on stderr.
If the \[lq]no\-man\[rq] option if specified, or the manpager fails, the
short options will be output to stdout.
.RS 2
.PP
To successfully use the manpages feature requires the manpages to be
installed or on \f[I]MANPATH\f[R], See \f[B]man\f[R](1) for more
details.
.RE
.IP \[bu] 2
\f[B]\-v\f[R], \f[B]\-\-version\f[R]: Display version information for
this tool, supported tctis and exit.
.SH EXAMPLES
.SS Change a password for an entity HS/SRK/myRSACryptKey to M1
.IP
.EX
tss2_changeauth \-\-entityPath=HS/SRK/myRSACryptKey \-\-authValue=M1
.EE
.SS Change a password for an entity HS/SRK/myRSACryptKey and ask the user to enter the password.
.IP
.EX
tss2_changeauth \-\-entityPath=HS/SRK/myRSACryptKey
.EE
.SH RETURNS
0 on success or 1 on failure.
.SH BUGS
\c
.UR https://github.com/tpm2-software/tpm2-tools/issues
Github Issues
.UE \c
.SH HELP
See the \c
.UR https://lists.linuxfoundation.org/mailman/listinfo/tpm2
Mailing List
.UE \c
.SH License
This work is licensed under the \c
.UR https://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International License (CC BY 4.0)
.UE \c
\&.