07-26-2004
The code is doing civil date to Julian date conversion, then subtracting. Julian date algorithms are, um, interesting. The big numbers relate to the epoch used for the calculation vs the data range expected in the civil calendar. I don't know where his particular numbers came from.
See:
http://scienceworld.wolfram.com/astr...ulianDate.html
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LEARN ABOUT MOJAVE
mail::dkim::algorithm::base5.18
Mail::DKIM::Algorithm::Base(3) User Contributed Perl Documentation Mail::DKIM::Algorithm::Base(3)
NAME
Mail::DKIM::Algorithm::Base - base class for DKIM "algorithms"
SYNOPSIS
my $algorithm = new Mail::DKIM::Algorithm::rsa_sha1(
Signature => $dkim_signature
);
# add headers
$algorithm->add_header("Subject: this is the subject 15 12");
$algorithm->finish_header;
# add body
$algorithm->add_body("This is the body. 15 12");
$algorithm->add_body("Another line of the body. 15 12");
$algorithm->finish_body;
# now sign or verify...
# TODO...
CONSTRUCTOR
You should not create an object of this class directly. Instead, use one of the DKIM algorithm implementation classes, such as rsa_sha1:
my $algorithm = new Mail::DKIM::Algorithm::rsa_sha1(
Signature => $dkim_signature
);
METHODS
add_body() - feeds part of the body into the algorithm/canonicalization
$algorithm->add_body("This is the body. 15 12");
$algorithm->add_body("Another line of the body. 15 12");
The body should be fed one "line" at a time.
add_header() - feeds a header field into the algorithm/canonicalization
$algorithm->add_header("Subject: this is the subject 15 12");
The header must start with the header field name and continue through any folded lines (including the embedded <CRLF> sequences). It
terminates with the <CRLF> at the end of the header field.
finish_body() - signals the end of the message body
$algorithm->finish_body
Call this method when all lines from the body have been submitted. After calling this method, use sign() or verify() to get the results
from the algorithm.
finish_header() - signals the end of the header field block
$algorithm->finish_header;
Call this method when all the headers have been submitted.
sign() - generates a signature using a private key
$base64 = $algorithm->sign($private_key);
signature() - get/set the signature worked on by this algorithm
my $old_signature = $algorithm->signature;
$algorithm->signature($new_signature);
verify() - verifies a signature
$result = $algorithm->verify();
Must be called after finish_body().
The result is a true/false value: true indicates the signature data is valid, false indicates it is invalid.
For an invalid signature, details may be obtained from $algorithm->{verification_details} or $@.
SEE ALSO
Mail::DKIM
AUTHOR
Jason Long, <jlong@messiah.edu>
COPYRIGHT AND LICENSE
Copyright (C) 2005-2007 by Messiah College
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.
perl v5.18.2 2012-11-28 Mail::DKIM::Algorithm::Base(3)