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#!/usr/bin/perl -I../lib
#
# This file is part of DKIMproxy, an SMTP-proxy implementing DKIM.
# Copyright (c) 2005-2008 Messiah College.
# Written by Jason Long <jlong@messiah.edu>.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor,
# Boston, MA 02110-1301, USA.
#
use strict;
use warnings;
use Mail::DKIM 0.17;
use Mail::DKIM::Signer;
use Getopt::Long;
use Pod::Usage;
#enable support for "pretty" signatures, if available
eval "require Mail::DKIM::TextWrap";
my $method = "simple";
my $selector = "selector1";
my $debug_canonicalization;
my $help;
GetOptions(
"method=s" => \$method,
"selector=s" => \$selector,
"debug-canonicalization=s" => \$debug_canonicalization,
"help|?" => \$help,
)
or pod2usage(2);
pod2usage(1) if $help;
pod2usage("Error: unrecognized argument(s)")
unless (@ARGV == 0);
my $dkim = new Mail::DKIM::Signer(
Policy => "MySignerPolicy",
Algorithm => "rsa-sha1",
Method => $method,
Selector => $selector,
KeyFile => "private.key",
Debug_Canonicalization => $debug_canonicalization);
while (<STDIN>)
{
chomp;
$dkim->PRINT("$_\015\012");
}
$dkim->CLOSE;
print $dkim->signature->as_string . "\n";
package MySignerPolicy;
use Mail::DKIM::SignerPolicy;
use base "Mail::DKIM::SignerPolicy";
sub apply
{
my ($self, $signer) = @_;
$signer->domain($signer->message_sender->host);
return 1;
}
__END__
=head1 NAME
dkimsign.pl - computes a DKIM signature for an email message
=head1 SYNOPSIS
dkimsign.pl [options] < original_email.txt
options:
--method=METHOD
--selector=SELECTOR
--debug-canonicalization=FILE
dkimsign.pl --help
to see a full description of the various options
=head1 OPTIONS
=over
=item B<--method>
Determines the desired canonicalization method. Possible values are
simple, simple/simple, simple/relaxed, relaxed, relaxed/relaxed,
relaxed/simple.
=item B<--debug-canonicalization>
Outputs the canonicalized message to the specified file, in addition
to computing the DKIM signature. This is helpful for debugging
canonicalization methods.
=back
=cut
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