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Mail::DKIM::ARC::Signature - represents a ARC-Message-Signature header
This is a subclass of Mail::DKIM::Signature
my $signature = Mail::DKIM::ARC::MessageSignature->new( [ Algorithm => 'rsa-sha256', ] [ Signature => $base64, ] [ Method => 'relaxed', ] [ Domain => 'example.org', ] [ Instance => 1, ] [ Headers => 'from:subject:date:message-id', ] [ Query => 'dns', ] [ Selector => 'alpha', ] [ Timestamp => time(), ] [ Expiration => time() + 86400, ] );
The only differences between this module and Mail::DKIM::Signature are the header name, and that 'instance' is an integer rather than a base64 encoded value.
my $i = $signature->instance;
Instances must be integers less than 1024 according to the spec.
NOTE: the i= field is "Identity" in DKIM and is a base64 value, but in ARC it is "Instance" and an integer. The parsing routine does not check that the i= value is a number.
Mail::DKIM::Signature for DKIM-Signature headers
Bron Gondwana, <email@example.com>
Copyright (C) 2017 by FastMail Pty Ltd
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.