gnu: Add libsodium.

* gnu-system.am (GNU_SYSTEM_MODULES): Add crypto.scm.
* gnu/packages/crypto.scm: New file.

gnu-system.am

@@ -59,6 +59,7 @@ GNU_SYSTEM_MODULES =				\
   gnu/packages/cpio.scm				\
   gnu/packages/cppi.scm				\
   gnu/packages/cross-base.scm			\
+  gnu/packages/crypto.scm			\
   gnu/packages/cryptsetup.scm			\
   gnu/packages/curl.scm				\
   gnu/packages/cursynth.scm			\

gnu/packages/crypto.scm

@@ -0,0 +1,44 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2014 David Thompson <davet@gnu.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 crypto)
+  #:use-module (gnu packages)
+  #:use-module (guix licenses)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu))
+
+(define-public libsodium
+  (package
+    (name "libsodium")
+    (version "0.5.0")
+    (source (origin
+            (method url-fetch)
+            (uri (string-append
+                  "http://download.libsodium.org/libsodium/releases/libsodium-"
+                  version ".tar.gz"))
+            (sha256
+             (base32
+              "1w7rrnsvhhzhywrr3nhlhppv4kqzdszz3dwy8jrsv8lrj5hs181w"))))
+    (build-system gnu-build-system)
+    (synopsis "Portable NaCl-based crypto library")
+    (description
+     "libsodium is a new easy-to-use high-speed software library for network
+communication, encryption, decryption, signatures, etc.")
+    (license isc)
+    (home-page "https://github.com/jedisct1/libsodium"))) ; No real homepage