NAME

       Mail::DKIM::ARC::Signature - represents a ARC-Message-Signature header

       This is a subclass of Mail::DKIM::Signature

CONSTRUCTORS

   new() - create a new signature from parameters
         my $signature = Mail::DKIM::ARC::MessageSignature->new(
                             [ Algorithm => "rsa-sha1", ]
                             [ 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.

   instance() - get or set the signing instance (i=) field
         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.

SEE ALSO

       Mail::DKIM::Signature for DKIM-Signature headers

AUTHOR

       Bron Gondwana, <brong@fastmailteam.com>

COPYRIGHT AND LICENSE

       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.