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package Mail::DKIM::Key; use strict; use warnings; # ABSTRACT: Represents a DKIM Key our $VERSION = '1.20230212'; # VERSION # Copyright 2006 Jason Long. All rights reserved. # # 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. sub cork { my $self = shift; (@_) and $self->{'CORK'} = shift; $self->{'CORK'} or $self->convert; $self->{'CORK'}; } sub data { my $self = shift; (@_) and $self->{'DATA'} = shift; $self->{'DATA'}; } sub errorstr { my $self = shift; (@_) and $self->{'ESTR'} = shift; $self->{'ESTR'}; } sub size { my $self = shift; return $self->cork->size * 8; } sub type { my $self = shift; (@_) and $self->{'TYPE'} = shift; $self->{'TYPE'}; } sub calculate_EM { my ( $digest_algorithm, $digest, $emLen ) = @_; # this function performs DER encoding of the algorithm ID for the # hash function and the hash value itself # It has this syntax: # DigestInfo ::= SEQUENCE { # digestAlgorithm AlgorithmIdentifier, # digest OCTET STRING # } # RFC 3447, page 42, provides the following octet values: my %digest_encoding = ( 'SHA-1' => pack( 'H*', '3021300906052B0E03021A05000414' ), 'SHA-256' => pack( 'H*', '3031300d060960864801650304020105000420' ), ); defined $digest_encoding{$digest_algorithm} or die "Unsupported digest algorithm '$digest_algorithm'"; my $T = $digest_encoding{$digest_algorithm} . $digest; my $tLen = length($T); if ( $emLen < $tLen + 11 ) { die 'Intended encoded message length too short.'; } my $PS = chr(0xff) x ( $emLen - $tLen - 3 ); my $EM = chr(0) . chr(1) . $PS . chr(0) . $T; return $EM; } 1; __END__ =pod =encoding UTF-8 =head1 NAME Mail::DKIM::Key - Represents a DKIM Key =head1 VERSION version 1.20230212 =head1 AUTHORS =over 4 =item * Jason Long <jason@long.name> =item * Marc Bradshaw <marc@marcbradshaw.net> =item * Bron Gondwana <brong@fastmailteam.com> (ARC) =back =head1 THANKS Work on ensuring that this module passes the ARC test suite was generously sponsored by Valimail (https://www.valimail.com/) =head1 COPYRIGHT AND LICENSE =over 4 =item * Copyright (C) 2013 by Messiah College =item * Copyright (C) 2010 by Jason Long =item * Copyright (C) 2017 by Standcore LLC =item * Copyright (C) 2020 by FastMail Pty Ltd =back This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.6 or, at your option, any later version of Perl 5 you may have available. =cut