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.\" ========================================================================
.\"
.IX Title "Module::Signature 3"
.TH Module::Signature 3 "2006-07-12" "perl v5.8.8" "User Contributed Perl Documentation"
.SH "NAME"
Module::Signature \- Module signature file manipulation
.SH "VERSION"
.IX Header "VERSION"
This document describes version 0.54 of \fBModule::Signature\fR,
released May 12, 2006.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
As a shell command:
.PP
.Vb 2
\&    % cpansign              # verify an existing SIGNATURE, or
\&                            # make a new one if none exists
.Ve
.PP
.Vb 2
\&    % cpansign sign         # make signature; overwrites existing one
\&    % cpansign -s           # same thing
.Ve
.PP
.Vb 3
\&    % cpansign verify       # verify a signature
\&    % cpansign -v           # same thing
\&    % cpansign -v --skip    # ignore files in MANIFEST.SKIP
.Ve
.PP
.Vb 2
\&    % cpansign help         # display this documentation
\&    % cpansign -h           # same thing
.Ve
.PP
In programs:
.PP
.Vb 3
\&    use Module::Signature qw(sign verify SIGNATURE_OK);
\&    sign();
\&    sign(overwrite => 1);       # overwrites without asking
.Ve
.PP
.Vb 2
\&    # see the CONSTANTS section below
\&    (verify() == SIGNATURE_OK) or die "failed!";
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBModule::Signature\fR adds cryptographic authentications to \s-1CPAN\s0
distributions, via the special \fI\s-1SIGNATURE\s0\fR file.
.PP
If you are a module user, all you have to do is to remember to run
\&\f(CW\*(C`cpansign \-v\*(C'\fR (or just \f(CW\*(C`cpansign\*(C'\fR) before issuing \f(CW\*(C`perl Makefile.PL\*(C'\fR
or \f(CW\*(C`perl Build.PL\*(C'\fR; that will ensure the distribution has not been
tampered with.
.PP
Module authors can easily add the \fI\s-1SIGNATURE\s0\fR file to the distribution
tarball; see \*(L"\s-1NOTES\s0\*(R" below for how to do it as part of \f(CW\*(C`make dist\*(C'\fR.
.PP
If you \fIreally\fR want to sign a distribution manually, simply add
\&\f(CW\*(C`SIGNATURE\*(C'\fR to \fI\s-1MANIFEST\s0\fR, then type \f(CW\*(C`cpansign \-s\*(C'\fR immediately
before \f(CW\*(C`make dist\*(C'\fR.  Be sure to delete the \fI\s-1SIGNATURE\s0\fR file afterwards.
.PP
Please also see \*(L"\s-1NOTES\s0\*(R" about \fI\s-1MANIFEST\s0.SKIP\fR issues, especially if
you are using \fBModule::Build\fR or writing your own \fI\s-1MANIFEST\s0.SKIP\fR.
.SH "VARIABLES"
.IX Header "VARIABLES"
No package variables are exported by default.
.IP "$Verbose" 4
.IX Item "$Verbose"
If true, Module::Signature will give information during processing including
gpg output.  If false, Module::Signature will be as quiet as possible as
long as everything is working ok.  Defaults to false.
.IP "$SIGNATURE" 4
.IX Item "$SIGNATURE"
The filename for a distribution's signature file.  Defaults to
\&\f(CW\*(C`SIGNATURE\*(C'\fR.
.IP "$KeyServer" 4
.IX Item "$KeyServer"
The OpenPGP key server for fetching the author's public key
(currently only implemented on \f(CW\*(C`gpg\*(C'\fR, not \f(CW\*(C`Crypt::OpenPGP\*(C'\fR).
May be set to a false value to prevent this module from
fetching public keys.
.IP "$KeyServerPort" 4
.IX Item "$KeyServerPort"
The OpenPGP key server port, defaults to \f(CW11371\fR.
.IP "$Timeout" 4
.IX Item "$Timeout"
Maximum time to wait to try to establish a link to the key server.
Defaults to \f(CW3\fR.
.IP "$AutoKeyRetrieve" 4
.IX Item "$AutoKeyRetrieve"
Whether to automatically fetch unknown keys from the key server.
Defaults to \f(CW1\fR.
.IP "$Cipher" 4
.IX Item "$Cipher"
The default cipher used by the \f(CW\*(C`Digest\*(C'\fR module to make signature
files.  Defaults to \f(CW\*(C`SHA1\*(C'\fR, but may be changed to other ciphers
via the \f(CW\*(C`MODULE_SIGNATURE_CIPHER\*(C'\fR environment variable if the \s-1SHA1\s0
cipher is undesirable for the user.
.Sp
The cipher specified in the \fI\s-1SIGNATURE\s0\fR file's first entry will
be used to validate its integrity.  For \f(CW\*(C`SHA1\*(C'\fR, the user needs
to have any one of these four modules installed: \fBDigest::SHA\fR,
\&\fBDigest::SHA1\fR, \fBDigest::SHA::PurePerl\fR, or (currently nonexistent)
\&\fBDigest::SHA1::PurePerl\fR.
.IP "$Preamble" 4
.IX Item "$Preamble"
The explanatory text written to newly generated \fI\s-1SIGNATURE\s0\fR files
before the actual entries.
.SH "ENVIRONMENT"
.IX Header "ENVIRONMENT"
\&\fBModule::Signature\fR honors these environment variables:
.IP "\s-1MODULE_SIGNATURE_CIPHER\s0" 4
.IX Item "MODULE_SIGNATURE_CIPHER"
Works like \f(CW$Cipher\fR.
.IP "\s-1MODULE_SIGNATURE_VERBOSE\s0" 4
.IX Item "MODULE_SIGNATURE_VERBOSE"
Works like \f(CW$Verbose\fR.
.IP "\s-1MODULE_SIGNATURE_KEYSERVER\s0" 4
.IX Item "MODULE_SIGNATURE_KEYSERVER"
Works like \f(CW$KeyServer\fR.
.IP "\s-1MODULE_SIGNATURE_KEYSERVERPORT\s0" 4
.IX Item "MODULE_SIGNATURE_KEYSERVERPORT"
Works like \f(CW$KeyServerPort\fR.
.IP "\s-1MODULE_SIGNATURE_TIMEOUT\s0" 4
.IX Item "MODULE_SIGNATURE_TIMEOUT"
Works like \f(CW$Timeout\fR.
.SH "CONSTANTS"
.IX Header "CONSTANTS"
These constants are not exported by default.
.ie n .IP "\s-1CANNOT_VERIFY\s0 (0E0)" 4
.el .IP "\s-1CANNOT_VERIFY\s0 (\f(CW0E0\fR)" 4
.IX Item "CANNOT_VERIFY (0E0)"
Cannot verify the OpenPGP signature, maybe due to the lack of a network
connection to the key server, or if neither gnupg nor Crypt::OpenPGP
exists on the system.
.ie n .IP "\s-1SIGNATURE_OK\s0 (0)" 4
.el .IP "\s-1SIGNATURE_OK\s0 (\f(CW0\fR)" 4
.IX Item "SIGNATURE_OK (0)"
Signature successfully verified.
.ie n .IP "\s-1SIGNATURE_MISSING\s0 (""\-1"")" 4
.el .IP "\s-1SIGNATURE_MISSING\s0 (\f(CW\-1\fR)" 4
.IX Item "SIGNATURE_MISSING (-1)"
The \fI\s-1SIGNATURE\s0\fR file does not exist.
.ie n .IP "\s-1SIGNATURE_MALFORMED\s0 (""\-2"")" 4
.el .IP "\s-1SIGNATURE_MALFORMED\s0 (\f(CW\-2\fR)" 4
.IX Item "SIGNATURE_MALFORMED (-2)"
The signature file does not contains a valid OpenPGP message.
.ie n .IP "\s-1SIGNATURE_BAD\s0 (""\-3"")" 4
.el .IP "\s-1SIGNATURE_BAD\s0 (\f(CW\-3\fR)" 4
.IX Item "SIGNATURE_BAD (-3)"
Invalid signature detected \*(-- it might have been tampered with.
.ie n .IP "\s-1SIGNATURE_MISMATCH\s0 (""\-4"")" 4
.el .IP "\s-1SIGNATURE_MISMATCH\s0 (\f(CW\-4\fR)" 4
.IX Item "SIGNATURE_MISMATCH (-4)"
The signature is valid, but files in the distribution have changed
since its creation.
.ie n .IP "\s-1MANIFEST_MISMATCH\s0 (""\-5"")" 4
.el .IP "\s-1MANIFEST_MISMATCH\s0 (\f(CW\-5\fR)" 4
.IX Item "MANIFEST_MISMATCH (-5)"
There are extra files in the current directory not specified by
the \s-1MANIFEST\s0 file.
.ie n .IP "\s-1CIPHER_UNKNOWN\s0 (""\-6"")" 4
.el .IP "\s-1CIPHER_UNKNOWN\s0 (\f(CW\-6\fR)" 4
.IX Item "CIPHER_UNKNOWN (-6)"
The cipher used by the signature file is not recognized by the
\&\f(CW\*(C`Digest\*(C'\fR and \f(CW\*(C`Digest::*\*(C'\fR modules.
.SH "NOTES"
.IX Header "NOTES"
.ie n .Sh "Signing your module as part of ""make dist"""
.el .Sh "Signing your module as part of \f(CWmake dist\fP"
.IX Subsection "Signing your module as part of make dist"
The easiest way is to use \fBModule::Install\fR:
.PP
.Vb 2
\&    sign;       # put this before "WriteAll"
\&    WriteAll;
.Ve
.PP
For \fBExtUtils::MakeMaker\fR (version 6.18 or above), you may do this:
.PP
.Vb 4
\&    WriteMakefile(
\&        (MM->can('signature_target') ? (SIGN => 1) : ()),
\&        # ... original arguments ...
\&    );
.Ve
.PP
Users of \fBModule::Build\fR may do this:
.PP
.Vb 4
\&    Module::Build->new(
\&        (sign => 1),
\&        # ... original arguments ...
\&    )->create_build_script;
.Ve
.Sh "\fI\s-1MANIFEST\s0.SKIP\fP Considerations"
.IX Subsection "MANIFEST.SKIP Considerations"
(The following section is lifted from Iain Truskett's \fBTest::Signature\fR
module, under the Perl license.  Thanks, Iain!)
.PP
It is \fBimperative\fR that your \fI\s-1MANIFEST\s0\fR and \fI\s-1MANIFEST\s0.SKIP\fR files be
accurate and complete. If you are using \f(CW\*(C`ExtUtils::MakeMaker\*(C'\fR and you
do not have a \fI\s-1MANIFEST\s0.SKIP\fR file, then don't worry about the rest of
this. If you do have a \fI\s-1MANIFEST\s0.SKIP\fR file, or you use
\&\f(CW\*(C`Module::Build\*(C'\fR, you must read this.
.PP
Since the test is run at \f(CW\*(C`make test\*(C'\fR time, the distribution has been
made. Thus your \fI\s-1MANIFEST\s0.SKIP\fR file should have the entries listed
below.
.PP
If you're using \f(CW\*(C`ExtUtils::MakeMaker\*(C'\fR, you should have, at least:
.PP
.Vb 5
\&    #defaults
\&    ^Makefile$
\&    ^blib/
\&    ^pm_to_blib
\&    ^blibdirs
.Ve
.PP
These entries are part of the default set provided by
\&\f(CW\*(C`ExtUtils::Manifest\*(C'\fR, which is ignored if you provide your own
\&\fI\s-1MANIFEST\s0.SKIP\fR file.
.PP
If you are using \f(CW\*(C`Module::Build\*(C'\fR, you should have two extra entries:
.PP
.Vb 2
\&    ^Build$
\&    ^_build/
.Ve
.PP
If you don't have the correct entries, \f(CW\*(C`Module::Signature\*(C'\fR will
complain that you have:
.PP
.Vb 1
\&    ==> MISMATCHED content between MANIFEST and distribution files! <==
.Ve
.PP
You should note this during normal development testing anyway.
.Sh "Testing signatures"
.IX Subsection "Testing signatures"
You may add this code as \fIt/0\-signature.t\fR in your distribution tree:
.PP
.Vb 1
\&    #!/usr/bin/perl
.Ve
.PP
.Vb 2
\&    use strict;
\&    print "1..1\en";
.Ve
.PP
.Vb 21
\&    if (!$ENV{TEST_SIGNATURE}) {
\&        print "ok 1 # skip Set the environment variable",
\&                    " TEST_SIGNATURE to enable this test\en";
\&    }
\&    elsif (!-s 'SIGNATURE') {
\&        print "ok 1 # skip No signature file found\en";
\&    }
\&    elsif (!eval { require Module::Signature; 1 }) {
\&        print "ok 1 # skip ",
\&                "Next time around, consider install Module::Signature, ",
\&                "so you can verify the integrity of this distribution.\en";
\&    }
\&    elsif (!eval { require Socket; Socket::inet_aton('pgp.mit.edu') }) {
\&        print "ok 1 # skip ",
\&                "Cannot connect to the keyserver\en";
\&    }
\&    else {
\&        (Module::Signature::verify() == Module::Signature::SIGNATURE_OK())
\&            or print "not ";
\&        print "ok 1 # Valid signature\en";
\&    }
.Ve
.PP
.Vb 1
\&    __END__
.Ve
.PP
If you are already using \fBTest::More\fR for testing, a more
straightforward version of \fIt/0\-signature.t\fR can be found in the
\&\fBModule::Signature\fR distribution.
.PP
Also, if you prefer a more full-fledged testing package, and are
willing to inflict the dependency of \fBModule::Build\fR on your users,
Iain Truskett's \fBTest::Signature\fR might be a better choice.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Digest, Digest::SHA, Digest::SHA1, Digest::SHA::PurePerl
.PP
ExtUtils::Manifest, Crypt::OpenPGP, Test::Signature
.PP
Module::Install, ExtUtils::MakeMaker, Module::Build
.SH "AUTHORS"
.IX Header "AUTHORS"
Audrey Tang <cpan@audreyt.org>
.ie n .SH "COPYRIGHT (The ""MIT"" License)"
.el .SH "COPYRIGHT (The ``MIT'' License)"
.IX Header "COPYRIGHT (The MIT License)"
Copyright 2002\-2006 by Audrey Tang <cpan@audreyt.org>.
.PP
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the \*(L"Software\*(R"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is fur\-
nished to do so, subject to the following conditions:
.PP
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
.PP
\&\s-1THE\s0 \s-1SOFTWARE\s0 \s-1IS\s0 \s-1PROVIDED\s0 \*(L"\s-1AS\s0 \s-1IS\s0\*(R", \s-1WITHOUT\s0 \s-1WARRANTY\s0 \s-1OF\s0 \s-1ANY\s0 \s-1KIND\s0, \s-1EXPRESS\s0 \s-1OR\s0
\&\s-1IMPLIED\s0, \s-1INCLUDING\s0 \s-1BUT\s0 \s-1NOT\s0 \s-1LIMITED\s0 \s-1TO\s0 \s-1THE\s0 \s-1WARRANTIES\s0 \s-1OF\s0 \s-1MERCHANTABILITY\s0, \s-1FIT\-\s0
\&\s-1NESS\s0 \s-1FOR\s0 A \s-1PARTICULAR\s0 \s-1PURPOSE\s0 \s-1AND\s0 \s-1NONINFRINGEMENT\s0.  \s-1IN\s0 \s-1NO\s0 \s-1EVENT\s0 \s-1SHALL\s0 \s-1THE\s0 X
\&\s-1CONSORTIUM\s0 \s-1BE\s0 \s-1LIABLE\s0 \s-1FOR\s0 \s-1ANY\s0 \s-1CLAIM\s0, \s-1DAMAGES\s0 \s-1OR\s0 \s-1OTHER\s0 \s-1LIABILITY\s0, \s-1WHETHER\s0 \s-1IN\s0 \s-1AN\s0
\&\s-1ACTION\s0 \s-1OF\s0 \s-1CONTRACT\s0, \s-1TORT\s0 \s-1OR\s0 \s-1OTHERWISE\s0, \s-1ARISING\s0 \s-1FROM\s0, \s-1OUT\s0 \s-1OF\s0 \s-1OR\s0 \s-1IN\s0 \s-1CONNECTION\s0
\&\s-1WITH\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \s-1OR\s0 \s-1THE\s0 \s-1USE\s0 \s-1OR\s0 \s-1OTHER\s0 \s-1DEALINGS\s0 \s-1IN\s0 \s-1THE\s0 \s-1SOFTWARE\s0.
Creat By MiNi SheLL
Email: devilkiller@gmail.com