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GnuPG.pm
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GnuPG.pm
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package Mail::GnuPG;
=head1 NAME
Mail::GnuPG - Process email with GPG.
=head1 SYNOPSIS
use Mail::GnuPG;
my $mg = new Mail::GnuPG( key => 'ABCDEFGH' );
$ret = $mg->mime_sign( $MIMEObj, 'you@my.dom' );
=head1 DESCRIPTION
Use GnuPG::Interface to process or create PGP signed or encrypted
email.
=cut
use 5.006;
use strict;
use warnings;
our $VERSION = '0.08';
use GnuPG::Interface;
use File::Spec;
use File::Temp;
use IO::Handle;
use MIME::Entity;
use MIME::Parser;
use Mail::Address;
=head2 new
Create a new Mail::GnuPG instance.
Arguments:
Paramhash...
key => gpg key id
keydir => gpg configuration/key directory
passphrase => primary key password
# FIXME: we need more things here, maybe primary key id.
=cut
sub new {
my $proto = shift;
my $class = ref($proto) || $proto;
my $self = {
key => undef,
keydir => undef,
passphrase => "",
gpg_path => "gpg",
@_
};
$self->{last_message} = [];
$self->{plaintext} = [];
bless ($self, $class);
return $self;
}
sub _set_options {
my ($self,$gnupg) = @_;
$gnupg->options->meta_interactive( 0 );
$gnupg->options->hash_init( armor => 1,
( defined $self->{keydir} ?
(homedir => $self->{keydir}) : () ),
( defined $self->{key} ?
( default_key => $self->{key} ) : () ),
# ( defined $self->{passphrase} ?
# ( passphrase => $self->{passphrase} ) : () ),
);
$gnupg->call( $self->{gpg_path} ) if defined $self->{gpg_path};
}
=head2 decrypt
Decrypt an encrypted message
Input:
MIME::Entity containing email message to decrypt.
The message can either be in RFC compliant-ish multipart/encrypted
format, or just a single part ascii armored message.
Output:
On Failure:
Exit code of gpg. (0 on success)
On Success: (just encrypted)
(0, undef, undef)
On success: (signed and encrypted)
( 0,
keyid, # ABCDDCBA
emailaddress # Foo Bar <foo@bar.com>
)
where the keyid is the key that signed it, and emailaddress is full
name and email address of the primary uid
$self->{last_message} => any errors from gpg
$self->{plaintext} => plaintext output from gpg
$self->{decrypted} => parsed output as MIME::Entity
=cut
sub decrypt {
my ($self, $message) = @_;
my $ciphertext = "";
$self->{last_message} = [];
unless (ref $message && $message->isa("MIME::Entity")) {
die "decrypt only knows about MIME::Entitys right now";
return 255;
}
my $armor_message = 0;
if ($message->effective_type =~ m!multipart/encrypted!) {
die "multipart/encrypted with more than two parts"
if ($message->parts != 2);
die "Content-Type not pgp-encrypted"
unless $message->parts(0)->effective_type =~
m!application/pgp-encrypted!;
$ciphertext = $message->parts(1)->stringify_body;
}
elsif ($message->body_as_string
=~ m!^-----BEGIN PGP MESSAGE-----!m ) {
$ciphertext = $message->body_as_string;
$armor_message = 1;
}
else {
die "Unknown Content-Type or no PGP message in body"
}
my $gnupg = GnuPG::Interface->new();
$self->_set_options($gnupg);
# how we create some handles to interact with GnuPG
# This time we'll catch the standard error for our perusing
# as well as passing in the passphrase manually
# as well as the status information given by GnuPG
my ( $input, $output, $error, $passphrase_fh, $status_fh )
= ( new IO::Handle, new IO::Handle,new IO::Handle,
new IO::Handle,new IO::Handle,);
my $handles = GnuPG::Handles->new( stdin => $input,
stdout => $output,
stderr => $error,
passphrase => $passphrase_fh,
status => $status_fh,
);
# this sets up the communication
my $pid = $gnupg->decrypt( handles => $handles );
# This passes in the passphrase
die "NO PASSPHRASE" unless defined $passphrase_fh;
print $passphrase_fh $self->{passphrase};
close $passphrase_fh;
# this passes in the plaintext
print $input $ciphertext;
# this closes the communication channel,
# indicating we are done
close $input;
my @plaintext = <$output>; # reading the output
my @error_output = <$error>; # reading the error
my @status_info = <$status_fh>;# read the status info
# clean up...
close $output;
close $error;
close $status_fh;
waitpid $pid, 0; # clean up the finished GnuPG process
my $exit_value = $? >> 8;
$self->{last_message} = \@error_output;
$self->{plaintext} = \@plaintext;
my $parser = new MIME::Parser;
$parser->output_to_core(1);
# for armor message (which usually contain no MIME entity)
# and if the first line seems to be no header, add an empty
# line at the top, otherwise the first line of a text message
# will be removed by the parser.
if ( $armor_message and $plaintext[0] and $plaintext[0] !~ /^[\w-]+:/ ) {
unshift @plaintext, "\n";
}
my $entity = $parser->parse_data(\@plaintext);
$self->{decrypted} = $entity;
return $exit_value if $exit_value; # failure
# if the message was signed and encrypted, extract the signature
# information and return it. In some theory or another, you can't
# trust an unsigned encrypted message is from who it says signed it.
# (Although I think it would have to go hand in hand at some point.)
# FIXME: these regex are likely to break under non english locales.
my $result = join "", @error_output;
my ($keyid) = $result =~ /using \S+ key ID (.+)$/m;
my ($pemail) = $result =~ /Good signature from "(.+)"$/m;
return ($exit_value,$keyid,$pemail);
}
=head2 get_decrypt_key
determines the decryption key (and corresponding mail) of a message
Input:
MIME::Entity containing email message to analyze.
The message can either be in RFC compliant-ish multipart/signed
format, or just a single part ascii armored message.
Output:
$key -- decryption key
$mail -- corresponding mail address
=cut
sub get_decrypt_key {
my ($self, $message) = @_;
unless (ref $message && $message->isa("MIME::Entity")) {
die "decrypt only knows about MIME::Entitys right now";
}
my $ciphertext;
if ($message->effective_type =~ m!multipart/encrypted!) {
die "multipart/encrypted with more than two parts"
if ($message->parts != 2);
die "Content-Type not pgp-encrypted"
unless $message->parts(0)->effective_type =~
m!application/pgp-encrypted!;
$ciphertext = $message->parts(1)->stringify_body;
}
elsif ($message->body_as_string
=~ m!^-----BEGIN PGP MESSAGE-----!m ) {
$ciphertext = $message->body_as_string;
}
else {
die "Unknown Content-Type or no PGP message in body"
}
my $gnupg = GnuPG::Interface->new();
# how we create some handles to interact with GnuPG
# This time we'll catch the standard error for our perusing
# as well as passing in the passphrase manually
# as well as the status information given by GnuPG
my ( $input, $output, $stderr )
= ( new IO::Handle, new IO::Handle, new IO::Handle );
my $handles = GnuPG::Handles->new( stdin => $input,
stdout => $output,
stderr => $stderr,
);
# this sets up the communication
my $pid = $gnupg->wrap_call(
handles => $handles,
commands => [ "--decrypt" ],
command_args => [ "--batch", "--list-only", "--status-fd", "1" ],
);
# this passes in the ciphertext
print $input $ciphertext;
# this closes the communication channel,
# indicating we are done
close $input;
# reading the output
my @result = <$output>;
# clean up...
close $output;
# clean up the finished GnuPG process
waitpid $pid, 0;
my $exit_value = $? >> 8;
# set last_message
$self->{last_message} = \@result;
# grep ENC_TO and NO_SECKEY items
my (@enc_to_keys, %no_sec_keys);
for ( @result ) {
push @enc_to_keys, $1 if /ENC_TO\s+([^\s]+)/;
$no_sec_keys{$1} = 1 if /NO_SECKEY\s+([^\s]+)/;
}
# find first key we have the secret portion of
my $key;
foreach my $k ( @enc_to_keys ) {
if ( not exists $no_sec_keys{$k} ) {
$key = $k;
last;
}
}
return if not $key;
# get mail address of this key
die "Invalid Key Format: $key" unless $key =~ /^[0-9A-F]+$/i;
my $cmd = $self->{gpg_path} . " --with-colons --list-keys $key 2>&1";
my $gpg_out = qx[ $cmd ];
## FIXME: this should probably use open| instead.
die "Couldn't find key $key in keyring" if $gpg_out !~ /\S/ or $?;
my $mail = (split(":", $gpg_out))[9];
return ($mail, $key);
}
=head2 verify
verify a signed message
Input:
MIME::Entity containing email message to verify.
The message can either be in RFC compliant-ish multipart/signed
format, or just a single part ascii armored message.
Output:
On error:
Exit code of gpg. (0 on success)
On success
( 0,
keyid, # ABCDDCBA
emailaddress # Foo Bar <foo@bar.com>
)
where the keyid is the key that signed it, and emailaddress is full
name and email address of the primary uid
$self->{last_message} => any errors from gpg
=cut
# Verify RFC2015/RFC3156 email
sub verify {
my ($self, $message) = @_;
my $ciphertext = "";
my $sigtext = "";
$self->{last_message} = [];
unless (ref $message && $message->isa("MIME::Entity")) {
die "VerifyMessage only knows about MIME::Entitys right now";
return 255;
}
if ($message->effective_type =~ m!multipart/signed!) {
die "multipart/signed with more than two parts"
if ($message->parts != 2);
die "Content-Type not pgp-signed"
unless $message->parts(1)->effective_type =~
m!application/pgp-signature!;
$ciphertext = $message->parts(0)->as_string;
$sigtext = $message->parts(1)->stringify_body;
}
elsif ( $message->bodyhandle and $message->bodyhandle->as_string
=~ m!^-----BEGIN PGP SIGNED MESSAGE-----!m ) {
# don't use not $message->body_as_string here, because
# the body isn't decoded in this case!!!
# (which is evil for quoted-printable transfer encoding)
# also the headers and stuff are not needed here
$ciphertext = undef;
$sigtext = $message->bodyhandle->as_string; # well, actually both
}
else {
die "Unknown Content-Type or no PGP message in body"
}
my $gnupg = GnuPG::Interface->new();
$self->_set_options($gnupg);
# how we create some handles to interact with GnuPG
my $input = IO::Handle->new();
my $error = IO::Handle->new();
my $handles = GnuPG::Handles->new( stderr => $error, stdin => $input );
my ($sigfh, $sigfile)
= File::Temp::tempfile('mgsXXXXXXXX',
DIR => File::Spec->tmpdir,
UNLINK => 1,
);
print $sigfh $sigtext;
close($sigfh);
my ($datafh, $datafile) =
File::Temp::tempfile('mgdXXXXXX',
DIR => File::Spec->tmpdir,
UNLINK => 1,
);
# according to RFC3156 all line endings MUST be CR/LF
if ( defined $ciphertext ) {
$ciphertext =~ s/\x0A/\x0D\x0A/g;
$ciphertext =~ s/\x0D+/\x0D/g;
}
# Read the (unencoded) body data:
# as_string includes the header portion
print $datafh $ciphertext if $ciphertext;
close($datafh);
my $pid = $gnupg->verify( handles => $handles,
command_args => ( $ciphertext ?
["$sigfile", "$datafile"] :
"$sigfile" ),
);
# Now we write to the input of GnuPG
# now we read the output
my @result = <$error>;
close $error;
close $input;
unlink $sigfile, $datafile;
waitpid $pid, 0;
my $exit_value = $? >> 8;
$self->{last_message} = [@result];
return $exit_value if $exit_value; # failure
# FIXME: these regex are likely to break under non english locales.
my $result = join "", @result;
my ($keyid) = $result =~ /using \S+ key ID (.+)$/m;
my ($pemail) = $result =~ /Good signature from "(.+)"$/m;
return ($exit_value,$keyid,$pemail);
}
# Should this go elsewhere? The Key handling stuff doesn't seem to
# make sense in a Mail:: module.
my %key_cache;
my $key_cache_age = 0;
my $key_cache_expire = 60*60*30; # 30 minutes
sub _rebuild_key_cache {
my $self = shift;
local $_;
%key_cache = ();
# sometimes the best tool for the job... is not perl
open(my $fh, "$self->{gpg_path} --list-public-keys --with-colons | cut -d: -f10|")
or die $!;
while(<$fh>) {
next unless $_;
# M::A may not parse the gpg stuff properly. Cross fingers
my ($a) = Mail::Address->parse($_); # list context, please
$key_cache{$a->address}=1 if ref $a;
}
}
=head2 has_public_key
Does the keyring have a public key for the specified email address?
FIXME: document better. talk about caching. maybe put a better
interface in.
=cut
sub has_public_key {
my ($self,$address) = @_;
# cache aging is disabled until someone has enough time to test this
if (0) {
$self->_rebuild_key_cache() unless ($key_cache_age);
if ( $key_cache_age && ( time() - $key_cache_expire > $key_cache_age )) {
$self->_rebuild_key_cache();
}
}
$self->_rebuild_key_cache();
return 1 if exists $key_cache{$address};
return 0;
}
=head2 mime_sign
sign an email message
Input:
MIME::Entity containing email message to sign
Output:
Exit code of gpg. (0 on success)
$self->{last_message} => any errors from gpg
The provided $entity will be signed. (i.e. it _will_ be modified.)
=cut
sub mime_sign {
my ($self,$entity) = @_;
die "Not a mime entity"
unless $entity->isa("MIME::Entity");
$entity->make_multipart;
my $workingentity = $entity;
if ($entity->parts > 1) {
$workingentity = MIME::Entity->build(Type => "multipart/mixed");
$workingentity->add_part($_) for ($entity->parts);
$entity->parts([]);
$entity->add_part($workingentity);
}
my $gnupg = GnuPG::Interface->new();
$self->_set_options( $gnupg );
my ( $input, $output, $error, $passphrase_fh, $status_fh )
= ( new IO::Handle, new IO::Handle,new IO::Handle,
new IO::Handle,new IO::Handle,);
my $handles = GnuPG::Handles->new( stdin => $input,
stdout => $output,
stderr => $error,
passphrase => $passphrase_fh,
status => $status_fh,
);
my $pid = $gnupg->detach_sign( handles => $handles );
die "NO PASSPHRASE" unless defined $passphrase_fh;
print $passphrase_fh $self->{passphrase};
close $passphrase_fh;
# this passes in the plaintext
my $plaintext;
if ($workingentity eq $entity) {
# $RT::Logger->crit("SINGLEPART");
$plaintext = $entity->parts(0)->as_string;
} else {
$plaintext = $workingentity->as_string;
}
# according to RFC3156 all line endings MUST be CR/LF
$plaintext =~ s/\x0A/\x0D\x0A/g;
$plaintext =~ s/\x0D+/\x0D/g;
# should we store this back into the body?
print $input $plaintext;
# DEBUG:
# print "SIGNING THIS STRING ----->\n";
# $plaintext =~ s/\n/-\n/gs;
# $RT::Logger->crit("SIGNING:\n$plaintext<<<");
# $RT::Logger->crit($entity->as_string);
# print STDERR $plaintext;
# print "<----\n";
$input->flush();
eval { $input->sync() }; # IO::Handle::sync not implemented on
# all systems.
close $input;
my @signature = <$output>; # reading the output
my @error_output = <$error>; # reading the error
my @status_info = <$status_fh>;# read the status info
# clean up...
close $output;
close $error;
close $status_fh;
waitpid $pid, 0; # clean up the finished GnuPG process
my $exit_value = $? >> 8;
$self->{last_message} = \@error_output;
$entity->attach( Type => "application/pgp-signature",
Disposition => "inline",
Data => [@signature],
Encoding => "7bit");
$entity->head->mime_attr("Content-Type","multipart/signed");
$entity->head->mime_attr("Content-Type.protocol","application/pgp-signature");
# $entity->head->mime_attr("Content-Type.micalg","pgp-md5");
return $exit_value;
}
=head2 clear_sign
clearsign the body of an email message
Input:
MIME::Entity containing email message to sign.
This entity MUST have a body.
Output:
Exit code of gpg. (0 on success)
$self->{last_message} => any errors from gpg
The provided $entity will be signed. (i.e. it _will_ be modified.)
=cut
sub clear_sign {
my ($self, $entity) = @_;
die "Not a mime entity"
unless $entity->isa("MIME::Entity");
my $body = $entity->bodyhandle;
die "Message has no body"
unless defined $body;
my $gnupg = GnuPG::Interface->new();
$self->_set_options( $gnupg );
$gnupg->passphrase ( $self->{passphrase} );
my ( $input, $output, $error )
= ( new IO::Handle, new IO::Handle, new IO::Handle);
my $handles = GnuPG::Handles->new(
stdin => $input,
stdout => $output,
stderr => $error,
);
my $pid = $gnupg->clearsign ( handles => $handles );
my $plaintext = $body->as_string;
$plaintext =~ s/\x0A/\x0D\x0A/g;
$plaintext =~ s/\x0D+/\x0D/g;
print $input $plaintext;
close $input;
my @ciphertext = <$output>;
my @error_output = <$error>;
close $output;
close $error;
waitpid $pid, 0;
my $exit_value = $? >> 8;
$self->{last_message} = [@error_output];
my $io = $body->open ("w") or die "can't open entity body";
$io->print (join('',@ciphertext));
$io->close;
return $exit_value;
}
=head2 ascii_encrypt
encrypt an email message body using ascii armor
Input:
MIME::Entity containing email message to encrypt.
This entity MUST have a body.
list of recipients
Output:
Exit code of gpg. (0 on success)
$self->{last_message} => any errors from gpg
The provided $entity will be encrypted. (i.e. it _will_ be modified.)
=head2 ascii_signencrypt
encrypt and sign an email message body using ascii armor
Input:
MIME::Entity containing email message to encrypt.
This entity MUST have a body.
list of recipients
Output:
Exit code of gpg. (0 on success)
$self->{last_message} => any errors from gpg
The provided $entity will be encrypted. (i.e. it _will_ be modified.)
=cut
sub ascii_encrypt {
my ($self, $entity, @recipients) = @_;
$self->_ascii_encrypt($entity, 0, @recipients);
}
sub ascii_signencrypt {
my ($self, $entity, @recipients) = @_;
$self->_ascii_encrypt($entity, 1, @recipients);
}
sub _ascii_encrypt {
my ($self, $entity, $sign, @recipients) = @_;
die "Not a mime entity"
unless $entity->isa("MIME::Entity");
my $body = $entity->bodyhandle;
die "Message has no body"
unless defined $body;
my $plaintext = $body->as_string;
my $gnupg = GnuPG::Interface->new();
$self->_set_options( $gnupg );
$gnupg->passphrase ( $self->{passphrase} );
$gnupg->options->push_recipients( $_ ) for @recipients;
my ( $input, $output, $error )
= ( new IO::Handle, new IO::Handle, new IO::Handle);
my $handles = GnuPG::Handles->new(
stdin => $input,
stdout => $output,
stderr => $error,
);
my $pid = do {
if ( $sign ) {
$gnupg->sign_and_encrypt ( handles => $handles );
} else {
$gnupg->encrypt ( handles => $handles );
}
};
print $input $plaintext;
close $input;
my @ciphertext = <$output>;
my @error_output = <$error>;
close $output;
close $error;
waitpid $pid, 0;
my $exit_value = $? >> 8;
$self->{last_message} = [@error_output];
my $io = $body->open ("w") or die "can't open entity body";
$io->print (join('',@ciphertext));
$io->close;
return $exit_value;
}
=head2 mime_encrypt
encrypt an email message
Input:
MIME::Entity containing email message to encrypt
list of email addresses to sign to
Output:
Exit code of gpg. (0 on success)
$self->{last_message} => any errors from gpg
The provided $entity will be encrypted. (i.e. it _will_ be modified.)
=head2 mime_signencrypt
sign and encrypt an email message
Input:
MIME::Entity containing email message to sign encrypt
list of email addresses to sign to
Output:
Exit code of gpg. (0 on success)
$self->{last_message} => any errors from gpg
The provided $entity will be encrypted. (i.e. it _will_ be modified.)
=cut
sub mime_encrypt {
my $self = shift;
$self->_mime_encrypt(0,@_);
}
sub mime_signencrypt {
my $self = shift;
$self->_mime_encrypt(1,@_);
}
sub _mime_encrypt {
my ($self,$sign,$entity,@recipients) = @_;
die "Not a mime entity"
unless $entity->isa("MIME::Entity");
my $workingentity = $entity;
$entity->make_multipart;
if ($entity->parts > 1) {
$workingentity = MIME::Entity->build(Type => "multipart/mixed");
$workingentity->add_part($_) for ($entity->parts);
$entity->parts([]);
$entity->add_part($workingentity);
}
my $gnupg = GnuPG::Interface->new();
$gnupg->options->push_recipients( $_ ) for @recipients;
$self->_set_options($gnupg);
my ( $input, $output, $error, $passphrase_fh, $status_fh )
= ( new IO::Handle, new IO::Handle,new IO::Handle,
new IO::Handle,new IO::Handle,);
my $handles = GnuPG::Handles->new( stdin => $input,
stdout => $output,
stderr => $error,
passphrase => $passphrase_fh,
status => $status_fh,
);
my $pid = do {
if ($sign) {
$gnupg->sign_and_encrypt( handles => $handles );
} else {
$gnupg->encrypt( handles => $handles );
}
};
die "NO PASSPHRASE" unless defined $passphrase_fh;
print $passphrase_fh $self->{passphrase};
close $passphrase_fh;
# this passes in the plaintext
my $plaintext;
if ($workingentity eq $entity) {
$plaintext= $entity->parts(0)->as_string;
} else {
$plaintext=$workingentity->as_string;
}
# no need to mangle line endings for encryption (RFC3156)
# $plaintext =~ s/\n/\x0D\x0A/sg;
# should we store this back into the body?
print $input $plaintext;
# DEBUG:
#print "ENCRYPTING THIS STRING ----->\n";
# print $plaintext;
# print "<----\n";
close $input;
my @ciphertext = <$output>; # reading the output
my @error_output = <$error>; # reading the error
my @status_info = <$status_fh>;# read the status info
# clean up...
close $output;
close $error;
close $status_fh;
waitpid $pid, 0;
my $exit_value = $? >> 8;
$self->{last_message} = [@error_output];
$entity->parts([]); # eliminate all parts
$entity->attach(Type => "application/pgp-encrypted",
Disposition => "inline",
Filename => "msg.asc",
Data => ["Version: 1",""],
Encoding => "7bit");
$entity->attach(Type => "application/octet-stream",
Disposition => "inline",
Data => [@ciphertext],
Encoding => "7bit");
$entity->head->mime_attr("Content-Type","multipart/encrypted");
$entity->head->mime_attr("Content-Type.protocol","application/pgp-encrypted");
$exit_value;
}
=head2 is_signed
best guess as to whether a message is signed or not (by looking at
the mime type and message content)
Input:
MIME::Entity containing email message to test
Output:
True or False value
=head2 is_encrypted
best guess as to whether a message is signed or not (by looking at
the mime type and message content)
Input:
MIME::Entity containing email message to test
Output:
True or False value
=cut
sub is_signed {
my ($self,$entity) = @_;
return 1
if (($entity->effective_type =~ m!multipart/signed!)
||
($entity->as_string =~ m!^-----BEGIN PGP SIGNED MESSAGE-----!m));
return 0;
}
sub is_encrypted {
my ($self,$entity) = @_;
return 1
if (($entity->effective_type =~ m!multipart/encrypted!)
||
($entity->as_string =~ m!^-----BEGIN PGP MESSAGE-----!m));
return 0;
}
# FIXME: there's no reason why is_signed and is_encrypted couldn't be
# static (class) methods, so maybe we should support that.
# FIXME: will we properly deal with signed+encrypted stuff? probably not.
# Autoload methods go after =cut, and are processed by the autosplit program.
1;
__END__
=head1 LICENSE
Copyright 2003 Best Practical Solutions, LLC
This program is free software; you can redistribute it and/or modify
it under the terms of either:
a) the GNU General Public License as published by the Free
Software Foundation; version 2
http://www.opensource.org/licenses/gpl-license.php
b) the "Artistic License"
http://www.opensource.org/licenses/artistic-license.php
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See either the
GNU General Public License or the Artistic License for more details.
=head1 AUTHOR
Robert Spier
=head1 BUGS/ISSUES/PATCHES
Please send all bugs/issues/patches to
bug-Mail-GnuPG@rt.cpan.org
=head1 SEE ALSO
L<perl>.
GnuPG::Interface,