[bug#42404] [PATCH] gnu: Add libtmcg and dkgpg.

[Justus Winter <justus@sequoia-pgp.org>]

* gnu/packages/openpgp.scm: New file.
---
 gnu/packages/openpgp.scm | 95 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 gnu/packages/openpgp.scm

diff --git a/gnu/packages/openpgp.scm b/gnu/packages/openpgp.scm
new file mode 100644
index 0000000000..d4bcbacafc
--- /dev/null
+++ b/gnu/packages/openpgp.scm
@@ -0,0 +1,95 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2020 Justus Winter <justus@sequoia-pgp.org>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix 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 the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages openpgp)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (gnu packages compression)
+  #:use-module (gnu packages gnupg)
+  #:use-module (gnu packages multiprecision))
+
+(define-public libtmcg
+  (package
+    (name "libtmcg")
+    (version "1.3.18")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "mirror://savannah/libtmcg/libTMCG-" version
+                                  ".tar.gz"))
+              (sha256
+               (base32
+                "179b5jx3mqs9hgsj8cfwk6x8qib60kw9szk9fkz6s1gl3v83mnyx"))))
+    (build-system gnu-build-system)
+    (arguments '(#:configure-flags '("--enable-silent-rules")))
+    (inputs `(("gmp" ,gmp)
+              ("libgcrypt" ,libgcrypt)))
+    (synopsis
+     "C++ library for creating secure and fair online card games")
+    (description
+     "The library provides a sort of useful classes, algorithms, and
+high-level protocols to support an application programmer in writing such
+software.  The most remarkable feature is the absence of a trusted third
+party (TTP), i.e. neither a central game server nor trusted hardware
+components are necessary.
+
+The corresponding cryptographic problem, actually called Mental Poker, has
+been studied since 1979 (Shamir, Rivest, and Adleman) by many authors (see the
+first section of [St05] for a short survey).  LibTMCG provides the first
+practical implementation of such protocols.")
+    (home-page "https://www.nongnu.org/libtmcg/")
+    (license license:gpl2+)))
+
+(define-public dkgpg
+  (package
+    (name "dkgpg")
+    (version "1.1.3")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "mirror://savannah/dkgpg/dkgpg-" version
+                                  ".tar.gz"))
+              (sha256
+               (base32
+                "1hpfg7akd5icj49i03z74hp9zj0xwl90bndn0hnw0hpb8lk7qcxg"))))
+    (build-system gnu-build-system)
+    (arguments '(#:configure-flags
+                 '("--enable-silent-rules")
+                 ;; https://savannah.nongnu.org/bugs/?58772
+                 #:parallel-tests? #f))
+    (inputs `(("bzip2" ,bzip2)
+              ("gmp" ,gmp)
+              ("libgcrypt" ,libgcrypt)
+              ("libtmcg" ,libtmcg)
+              ("zlib" ,zlib)))
+    (synopsis
+     "Distributed Key Generation and Threshold Cryptography for OpenPGP")
+    (description
+     "The Distributed Privacy Guard (DKGPG) implements Distributed Key
+Generation (DKG) and Threshold Cryptography for OpenPGP.  The generated public
+keys are compatible with the standard and thus can be used by any
+RFC4880-compliant application (e.g. GnuPG).  The main purposes of this
+software are distributing power among multiple parties, eliminating single
+points of failure, and increasing the difficulty of side-channel attacks on
+private key material.
+
+DKGPG consists of a bunch of simple command-line programs.  The current
+implementation is in experimental state and should NOT be used in production
+environments.")
+    (home-page "https://www.nongnu.org/dkgpg/")
+    (license license:gpl2+)))
-- 
2.20.1