#!/usr/bin/perl
# Copyright 2005-2006 Messiah College. All rights reserved.
# Jason Long <jlong@messiah.edu>
# Copyright (c) 2004 Anthony D. Urso. All rights reserved.
# This program is free software; you can redistribute it and/or
# modify it under the same terms as Perl itself.
use strict;
use warnings;
use Mail::DKIM::PrivateKey;
package Mail::DKIM::Algorithm::rsa_sha256;
use base "Mail::DKIM::Algorithm::Base";
use Carp;
use MIME::Base64;
use Digest::SHA;
sub init_digests
{
my $self = shift;
# initialize a SHA-256 Digest
$self->{header_digest} = new Digest::SHA(256);
$self->{body_digest} = new Digest::SHA(256);
}
sub sign
{
my $self = shift;
croak "wrong number of arguments" unless (@_ == 1);
my ($private_key) = @_;
my $digest = $self->{header_digest}->digest;
my $signature = $private_key->sign_digest("SHA-256", $digest);
return encode_base64($signature, "");
}
sub verify
{
my $self = shift;
croak "wrong number of arguments" unless (@_ == 0);
my $base64 = $self->signature->data;
my $public_key = $self->signature->get_public_key;
my $digest = $self->{header_digest}->digest;
my $sig = decode_base64($base64);
return unless $public_key->verify_digest("SHA-256", $digest, $sig);
return $self->check_body_hash;
}
sub wants_pre_signature_headers
{
return 1;
}
1;
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