                              PGP::Sign 1.00
               (create and verify detached PGP signatures)
                Maintained by Russ Allbery <rra@cpan.org>

  Copyright 1997-2000, 2002, 2004, 2018, 2020 Russ Allbery <rra@cpan.org>.
  This software is distributed under the same terms as Perl itself.
  Please see the section LICENSE below for more information.

BLURB

  PGP::Sign is a Perl module for generating and verifying detached OpenPGP
  signatures of textual data using GnuPG.  It was written to support
  Netnews article signatures for signed control messages and PGPMoose.

DESCRIPTION

  PGP::Sign is a Perl module that can generate and verify OpenPGP
  signatures on some data.  Currently, only textual data (data that can be
  processed using GnuPG's --textmode option) is supported.  It uses GnuPG
  under the hood to do the work.

  The original purpose of this module was to factor out common code in a
  News::Article class written by Andrew Gierth that handled PGPMoose and
  control message signatures.  It is used to verify control message
  signatures for the ftp.isc.org Netnews metadata archive, and to generate
  signed control messages for the Big Eight Usenet hierarchies.

  Data to be signed or verified can be passed into PGP::Sign in a wide
  variety of formats: scalars, arrays, open files, even code references
  that act as generators.  Keys with passphrases are supported and the
  passphrase is passed to GnuPG securely (although getting the passphrase
  to the PGP::Sign module is a problem for the calling application).

  This module supports both GnuPG v2 and GnuPG v1 and, when used with
  GnuPG v1, supports using OpenPGP keys and generating and verifying
  signatures that are backward-compatible with PGP 2.6.2.

  PGP::Sign provides both a (recommended) object-oriented API and a
  (legacy) function-based API that uses global variables for configuration
  and is backward-compatible with earlier versions of PGP::Sign.

REQUIREMENTS

  Perl 5.20 or later and Module::Build are required to build this module,
  and IPC::Run is required to use it.  Either GnuPG v2 or GnuPG v1
  (selectable at runtime) is also required.  It has not been tested with
  versions of GnuPG older than 1.4.23.

  PGP::Sign uses IPC::Run features that are documented as not available on
  Windows (primarily higher-numbered file descriptors) and has never been
  tested with Gpg4win, so will probably not work on Windows (or, for that
  matter, other non-UNIX systems).

BUILDING AND INSTALLATION

  PGP::Sign uses Module::Build and can be installed using the same process
  as any other Module::Build module:

      perl Build.PL
      ./Build
      ./Build install

  You will have to run the last command as root unless you're installing
  into a local Perl module tree in your home directory.

TESTING

  PGP::Sign comes with a test suite, which you can run after building
  with:

      ./Build test

  If a test fails, you can run a single test with verbose output via:

      ./Build test --test_files <path-to-test>

  The following additional Perl modules will be used by the test suite if
  present:

  * Devel::Cover
  * Test::MinimumVersion
  * Test::Perl::Critic
  * Test::Pod
  * Test::Pod::Coverage
  * Test::Spelling
  * Test::Strict
  * Test::Synopsis

  All are available on CPAN.  Those tests will be skipped if the modules
  are not available.

  To enable tests that don't detect functionality problems but are used to
  sanity-check the release, set the environment variable RELEASE_TESTING
  to a true value.  To enable tests that may be sensitive to the local
  environment or that produce a lot of false positives without uncovering
  many problems, set the environment variable AUTHOR_TESTING to a true
  value.

SUPPORT

  The PGP::Sign web page at:

      https://www.eyrie.org/~eagle/software/pgp-sign/

  will always have the current version of this package, the current
  documentation, and pointers to any additional resources.

  For bug tracking, use the issue tracker on GitHub:

      https://github.com/rra/pgp-sign/issues

  Please be aware that I tend to be extremely busy and work projects often
  take priority.  I'll save your report and get to it as soon as I can,
  but it may take me a couple of months.

SOURCE REPOSITORY

  PGP::Sign is maintained using Git.  You can access the current source on
  GitHub at:

      https://github.com/rra/pgp-sign

  or by cloning the repository at:

      https://git.eyrie.org/git/perl/pgp-sign.git

  or view the repository via the web at:

      https://git.eyrie.org/?p=perl/pgp-sign.git

  The eyrie.org repository is the canonical one, maintained by the author,
  but using GitHub is probably more convenient for most purposes.  Pull
  requests are gratefully reviewed and normally accepted.

LICENSE

  The PGP::Sign package as a whole is covered by the following copyright
  statement and license:

    Copyright 1997-2000, 2002, 2004, 2018, 2020
        Russ Allbery <rra@cpan.org>

    This program is free software; you may redistribute it and/or modify
    it under the same terms as Perl itself.  This means that you may
    choose between the two licenses that Perl is released under: the GNU
    GPL and the Artistic License.  Please see your Perl distribution for
    the details and copies of the licenses.

  Some files in this distribution are individually released under
  different licenses, all of which are compatible with the above general
  package license but which may require preservation of additional
  notices.  All required notices, and detailed information about the
  licensing of each file, are recorded in the LICENSE file.

  Files covered by a license with an assigned SPDX License Identifier
  include SPDX-License-Identifier tags to enable automated processing of
  license information.  See https://spdx.org/licenses/ for more
  information.

  For any copyright range specified by files in this package as YYYY-ZZZZ,
  the range specifies every single year in that closed interval.
