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.nr HAVE_TCTI_DEV 1
.nr HAVE_TCTI_SOCK 1
.\" Copyright (c) 2016, Intel Corporation
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions are met:
.\"
.\" 1. Redistributions of source code must retain the above copyright notice,
.\" this list of conditions and the following disclaimer.
.\"
.\" 2. Redistributions in binary form must reproduce the above copyright notice,
.\" this list of conditions and the following disclaimer in the documentation
.\" and/or other materials provided with the distribution.
.\"
.\" 3. Neither the name of Intel Corporation nor the names of its contributors
.\" may be used to endorse or promote products derived from this software without
.\" specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
.\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
.\" THE POSSIBILITY OF SUCH DAMAGE.
.TH tpm2_verifysignature 8 "DECEMBER 2016" Intel "tpm2.0-tools"
.SH NAME
tpm2_verifysignature\ - uses loaded keys to validate a signature on a message with the message digest
passed to the TPM. If the signature check succeeds, then the TPM will produce
a TPMT_TK_VERIFIED. Otherwise, the TPM shall return TPM_RC_SIGNATURE. If
keyHandle references an asymmetric key, only the public portion of the key
needs to be loaded. If keyHandle references a symmetric key, both the public
and private portions need to be loaded.
.SH SYNOPSIS
.B tpm2_verifysignature[ COMMON OPTIONS ] [ TCTI OPTIONS ] [ \fB\-\-keyHandle\fR|\fB\-\-keyContext\fR|\fB\-\-halg\fR|\fB\-\-msg\fR|\fB\-\-digest\fR|\fB\-\-sig\fR|\fB\-\-raw\fR|\fB\-\-ticket\fR|\fB ]
.PP
uses loaded keys to validate a signature on a message with the message digest
passed to the TPM. If the signature check succeeds, then the TPM will produce
a TPMT_TK_VERIFIED. Otherwise, the TPM shall return TPM_RC_SIGNATURE. If
keyHandle references an asymmetric key, only the public portion of the key
needs to be loaded. If keyHandle references a symmetric key, both the public
and private portions need to be loaded.
.SH DESCRIPTION
.B tpm2_verifysignature
uses loaded keys to validate a signature on a message with the message digest
passed to the TPM. If the signature check succeeds, then the TPM will produce
a TPMT_TK_VERIFIED. Otherwise, the TPM shall return TPM_RC_SIGNATURE. If
keyHandle references an asymmetric key, only the public portion of the key
needs to be loaded. If keyHandle references a symmetric key, both the public
and private portions need to be loaded.
.SH OPTIONS
.TP
\fB\-k ,\-\-keyHandle\fR
handle of public key that will be used in the validation
.TP
\fB\-c ,\-\-keyContext\fR
filename of the key context used for the operation
.TP
\fB\-g ,\-\-halg\fR
the hash algorithm used to digest the message 0x0004 TPM_ALG_SHA1 0x000B TPM_ALG_SHA256 0x000C TPM_ALG_SHA384 0x000D TPM_ALG_SHA512 0x0012 TPM_ALG_SM3_256
.TP
\fB\-m ,\-\-msg\fR
the input message file, containning the content to be digested
.TP
\fB\-D ,\-\-digest\fR
the input hash file, containning the hash of the message. If this argument been chosed, the argument '-m(--msg)' and '-g(--halg)' is no need
.TP
\fB\-s ,\-\-sig\fR
the input signature file, containning the signature to be tested
.TP
\fB\-r ,\-\-raw\fR
set the input signature file to raw type, default TPMT_SIGNATURE, optional
.TP
\fB\-t ,\-\-ticket\fR
the ticket file, record the validation structure
.TP
[\fBCOMMON OPTIONS\fR ]
This collection of options are common to many programs and provide
information that many users may expect.
.TP
\fB\-h,\ \-\-help\fR
Display a manual describing the tool and its usage.
.TP
\fB\-v,\ \-\-version\fR
Display version information for this tool.
.TP
\fB\-V,\ \-\-verbose\fR
Increase the information that the tool prints to the console during its
execution.
.TP
[\fBTCTI OPTIONS\fR ]
This collection of options are used to configure the varous TCTI modules
available.
.TP
\fB\-T,\ \-\-tcti\fR
Select the TCTI used for communication with the next component down the TSS
stack.
In most configurations this will be the TPM but it could be a simulator or
proxy.
Supported TCTIs are
.if (\n[HAVE_TCTI_DEV]) or \fB\*(lqdevice\*(rq\fR
.if (\n[HAVE_TCTI_SOCK]) or \fB\*(lqsocket\*(rq\fR
\[char46]
.TP
.if (\n[HAVE_TCTI_DEV] \{
\fB\-d,\ \-\-device-file\fR
Specify the TPM device file for use by the device TCTI. The default is
/dev/tpm0.
\}
.if (\n[HAVE_TCTI_SOCK] \{
.TP
\fB\-R,\ \-\-socket-address\fR
Specify the domain name or IP address used by the socket TCTI. The default
is 127.0.0.1.
.TP
\fB\-p,\ \-\-socket-port\fR
Specify the port number used by the socket TCTI. The default is 2321.
\}
.TP
\fBENVIRONMENT: TCTI\fR
This collection of environment variables that may be used to configure the
varous TCTI modules available.
The values passed through these variables can be overridden on a per-command
basis using the available command line options.
.TP
\fBTPM2TOOLS_TCTI_NAME\fR
Select the TCTI used for communication with the next component down the TSS
stack.
In most configurations this will be the TPM but it could be a simulator or
proxy.
See '\fBOPTIONS\fR' section for the names of supported TCTIs.
.TP
.if (\n[HAVE_TCTI_DEV] \{
\fBTPM2TOOLS_DEVICE_FILE\fR
Specify the TPM device file for use by the device TCTI.
\}
.if (\n[HAVE_TCTI_SOCK] \{
.TP
\fBTPM2TOOLS_SOCKET_ADDRESS\fR
Specify the domain name or IP address used by the socket TCTI.
.TP
\fBTPM2TOOLS_SOCKET_PORT\fR
Specify the port number used by the socket TCTI.
\}
.SH EXAMPLES
.B tpm2_verifysignature
.PP
.nf
.RS
tpm2_verifysignature -k 0x81010001 -g 0x000B -m <filePath> -s <filePath> -t <filePath>
tpm2_verifysignature -k 0x81010001 -D <filePath> -s <filePath> -t <filePath>
tpm2_verifysignature -c key.context -g 0x000B -m <filePath> -s <filePath> -t <filePath>
.RE
.fi
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