.\" $OpenBSD: gzsig.1,v 1.9 2007/05/31 19:20:11 jmc Exp $
.\" $Id: gzsig.1,v 1.9 2007/05/31 19:20:11 jmc Exp $
.\"
.\"  Copyright (c) 2001 Dug Song <dugsong@arbor.net>
.\"  Copyright (c) 2001 Arbor Networks, Inc.
.\"
.\"    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. The names of the copyright holders may not be used to endorse or
.\"       promote products derived from this software without specific
.\"       prior written permission.
.\"
.\"    THIS SOFTWARE IS PROVIDED ``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 AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
.\"    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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.\"    OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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.\"
.Dd $Mdocdate: May 31 2007 $
.Dt GZSIG 1
.Sh NAME
.Nm gzsig
.Nd gzip signing utility
.Sh SYNOPSIS
.Nm gzsig
.Ic sign
.Op Fl q
.Op Fl f Ar secret_file
.Ar privkey
.Op Ar
.Nm gzsig
.Ic verify
.Op Fl q
.Op Fl f Ar secret_file
.Ar pubkey
.Op Ar
.Sh DESCRIPTION
.Nm
embeds or verifies RSA PKCS #1 v2.0 or DSA SHA1 signatures in
.Xr gzip 1
compressed files using SSH identity keys or X509 certificates.
.Pp
The
.Ar file
operands are processed in command-line order.
If
.Ar file
is a single dash
.Pq Sq -
or absent,
.Nm
reads from the standard input.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl f Ar secret_file
Indicates that the passphrase for the key should be read from
.Ar secret_file
instead of being supplied manually.
.It Fl q
Enable quiet mode.
.It Ic sign
Sign the input using the private key in
.Ar privkey .
.It Ic verify
Verify the signature using the public key in
.Ar pubkey .
.El
.Pp
The
.Nm
utility exits 0 on success or \*(Gt0 if an error occurred.
.Sh EXAMPLES
Sign
.Ar file1
and
.Ar file2
with the SSH2 identity key in
.Ar ~/.ssh/id_rsa :
.Pp
.Dl $ gzsig sign ~/.ssh/id_rsa file1 file2
.Pp
Sign
.Ar file1
with the SSH2 identity key, saving the signed file in
.Ar file2 :
.Pp
.Dl $ gzsig sign ~/.ssh/id_rsa \*(Ltfile1 \*(Gtfile2
.Pp
Verify the signature on
.Ar file1
using the SSL certificate in
.Ar /etc/ssl/server.crt :
.Pp
.Dl $ gzsig verify /etc/ssl/server.crt \*(Ltfile1
.Sh SEE ALSO
.Xr gzip 1 ,
.Xr ssh-keygen 1 ,
.Xr ssl 8
.Sh AUTHORS
Dug Song
.Aq dugsong@arbor.net .
SSH2 support by
Marius Eriksen
.Aq marius@openbsd.org .