NAME

Mail::DKIM - Signs/verifies Internet mail using DKIM message signatures

SYNOPSIS

# verify a message
use Mail::DKIM::Verifier;

# create a verifier object
my $dkim = Mail::DKIM::Verifier->new_object();

# read an email from stdin, pass it into the verifier
while (<STDIN>)
{
    # remove local line terminators
    chomp;
    s/\015$//;

    # use SMTP line terminators
    $dkim->PRINT("$_\015\012");
}
$dkim->CLOSE;

# what is the result of the verify?
my $result = $dkim->result;

DESCRIPTION

This Perl module is part of the dkimproxy program, located at http://jason.long.name/dkimproxy/. I've tried to abstract out the DKIM parts into this module, for use in other programs.

The Mail::DKIM module uses an object-oriented interface. You use one of two different classes, depending on whether you are signing or verifying a message. To sign, use the Mail::DKIM::Signer class. To verify, use the Mail::DKIM::Verifier class. Simple, eh?

SEE ALSO

Mail::DKIM::Signer

Mail::DKIM::Verifier

http://jason.long.name/dkimproxy/

KNOWN BUGS

The DKIM standard is still in development, so by the time you read this, this module may already be broken with regards to the latest DKIM specification.

One feature that has not been implemented yet is the "sender signing policy". I.e. this library will tell you whether the signature is valid, but will not lookup the signing policy for the author of the message.

This library uses two different crypto libraries: Crypt::OpenSSL::RSA and Crypt::RSA. This redundancy is undesirable, but so far I have not figured out how to load base64-encoded key data using Crypt::RSA, and I have not figured out to sign/verify an already-computed message digest using Crypt::OpenSSL::RSA.

AUTHOR

Jason Long, <jlong@messiah.edu>

COPYRIGHT AND LICENSE

Copyright (C) 2006 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.