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.TH "tss2_changeauth" "1" "APRIL 2019" "tpm2-tools" "General Commands Manual"
.hy
.SH NAME
.PP
\f[B]tss2_changeauth\f[R](1) - This command changes the authorization
data of an entity referred to by the path.
.SH SYNOPSIS
.PP
\f[B]tss2_changeauth\f[R] [\f[I]OPTIONS\f[R]]
.SH SEE ALSO
.PP
\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
.PP
\f[B]tss2_changeauth\f[R](1) -
.SH OPTIONS
.PP
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
.PP
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
.nf
\f[C]
tss2_changeauth --entityPath=HS/SRK/myRSACryptKey --authValue=M1
\f[R]
.fi
.SS Change a password for an entity HS/SRK/myRSACryptKey and ask the user to enter the password.
.IP
.nf
\f[C]
tss2_changeauth --entityPath=HS/SRK/myRSACryptKey
\f[R]
.fi
.SH RETURNS
.PP
0 on success or 1 on failure.
.SH BUGS
.PP
Github Issues (https://github.com/tpm2-software/tpm2-tools/issues)
.SH HELP
.PP
See the Mailing
List (https://lists.linuxfoundation.org/mailman/listinfo/tpm2)