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#!/usr/bin/perl -I../lib
#
# Copyright (c) 2005-2006 Messiah College. This program is free software.
# You can redistribute it and/or modify it under the terms of the
# GNU Public License as found at http://www.fsf.org/copyleft/gpl.html.
#
# Written by Jason Long, jlong@messiah.edu.
use strict;
use warnings;
use Mail::DKIM::Signer;
use Getopt::Long;
use Pod::Usage;
my $selector = "selector1";
my $algorithm = "rsa-sha1";
my $method = "simple";
my $debug_canonicalization;
my $help;
GetOptions(
"algorithm=s" => \$algorithm,
"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 => $algorithm,
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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