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Mail::DKIM::ARC::Seal - represents a ARC-Seal header
my $signature = Mail::DKIM::ARC::Seal->new( [ Algorithm => 'rsa-sha256', ] [ Signature => $base64, ] [ Domain => 'example.org', ] [ Instance => 1, ] [ Chain => 'none', ] # none|fail|pass [ Query => 'dns', ] [ Selector => 'alpha', ] [ Timestamp => time(), ] [ Expiration => time() + 86400, ] );
The ARC-Seal is similar to a DKIM signature but with the following changes:
188.8.131.52. Tags in the ARC-Seal Header Field Value
The following tags are the only supported tags for an ARC-Seal field. All of them MUST be present. Unknown tags MUST be ignored and do not affect the validity of the header. o a = hash algorithm; syntax is the same as the "a=" tag defined in Section 3.5 of [RFC6376]; o b = digital signature; syntax is the same as the "b=" tag defined in Section 3.5 of [RFC6376]; o cv = chain validation status: valid values: * 'none' = no pre-existing chain; * 'fail' = the chain as received does not or can not validate; or * 'pass' = valid chain received. o d = domain for key; syntax is the same as the "d=" tag defined in Section 3.5 of [RFC6376]; o i = "instance" or sequence number; monotonically increasing at each "sealing" entity, beginning with '1', see Section 184.108.40.206.1 regarding the valid range o s = selector for key; syntax is the same as the "s=" tag defined in Section 3.5 of [RFC6376]; o t = timestamp; syntax is the same as the "t=" tag defined in Section 3.5 of [RFC6376].
This must be one of "pass", "fail" or "none". For a chain to be valid, the very first (i=1) seal MUST be cv=none, and all further seals MUST be cv=pass.
my $i = $signature->instance;
Instances must be integers less than 1024 according to the spec.
Mail::DKIM::Signature for DKIM-Signature headers
Mail::DKIM::ARC::MessageSignature for ARC-Message-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.