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.\" ========================================================================
.\"
.IX Title "Mail::DKIM::ARC::MessageSignature 3pm"
.TH Mail::DKIM::ARC::MessageSignature 3pm "2020-09-11" "perl v5.30.3" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
Mail::DKIM::ARC::MessageSignature \- Subclass of Mail::DKIM::Signature which represents a ARC\-Message\-Signature header
.SH "VERSION"
.IX Header "VERSION"
version 1.20200907
.SH "CONSTRUCTORS"
.IX Header "CONSTRUCTORS"
.SS "\fBnew()\fP \- create a new signature from parameters"
.IX Subsection "new() - create a new signature from parameters"
.Vb 12
\&  my $signature = Mail::DKIM::ARC::MessageSignature\->new(
\&                      [ Algorithm => \*(Aqrsa\-sha256\*(Aq, ]
\&                      [ Signature => $base64, ]
\&                      [ Method => \*(Aqrelaxed\*(Aq, ]
\&                      [ Domain => \*(Aqexample.org\*(Aq, ]
\&                      [ Instance => 1, ]
\&                      [ Headers => \*(Aqfrom:subject:date:message\-id\*(Aq, ]
\&                      [ Query => \*(Aqdns\*(Aq, ]
\&                      [ Selector => \*(Aqalpha\*(Aq, ]
\&                      [ Timestamp => time(), ]
\&                      [ Expiration => time() + 86400, ]
\&                  );
.Ve
.PP
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.
.SS "\fBinstance()\fP \- get or set the signing instance (i=) field"
.IX Subsection "instance() - get or set the signing instance (i=) field"
.Vb 1
\&  my $i = $signature\->instance;
.Ve
.PP
Instances must be integers less than 1024 according to the spec.
.PP
\&\s-1NOTE:\s0 the i= field is \*(L"Identity\*(R" in \s-1DKIM\s0 and is a base64 value, but in
\&\s-1ARC\s0 it is \*(L"Instance\*(R" and an integer.  The parsing routine does not
check that the i= value is a number.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Mail::DKIM::Signature for DKIM-Signature headers
.SH "AUTHORS"
.IX Header "AUTHORS"
.IP "\(bu" 4
Jason Long <jason@long.name>
.IP "\(bu" 4
Marc Bradshaw <marc@marcbradshaw.net>
.IP "\(bu" 4
Bron Gondwana <brong@fastmailteam.com> (\s-1ARC\s0)
.SH "THANKS"
.IX Header "THANKS"
Work on ensuring that this module passes the \s-1ARC\s0 test suite was
generously sponsored by Valimail (https://www.valimail.com/)
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
.IP "\(bu" 4
Copyright (C) 2013 by Messiah College
.IP "\(bu" 4
Copyright (C) 2010 by Jason Long
.IP "\(bu" 4
Copyright (C) 2017 by Standcore \s-1LLC\s0
.IP "\(bu" 4
Copyright (C) 2020 by FastMail Pty Ltd
.PP
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.