distro: Add GNU Nettle.

* distro/packages/nettle.scm: New file.
* Makefile.am (MODULES): Add it.

Makefile.am

@@ -60,6 +60,7 @@ MODULES =					\
   distro/packages/make-bootstrap.scm		\
   distro/packages/multiprecision.scm		\
   distro/packages/ncurses.scm			\
+  distro/packages/nettle.scm			\
   distro/packages/perl.scm			\
   distro/packages/pkg-config.scm		\
   distro/packages/pth.scm			\

distro/packages/nettle.scm

@@ -0,0 +1,63 @@
+;;; Guix --- Nix package management from Guile.         -*- coding: utf-8 -*-
+;;; Copyright (C) 2012 Ludovic Courtès <ludo@gnu.org>
+;;;
+;;; This file is part of Guix.
+;;;
+;;; 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.
+;;;
+;;; 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 Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (distro packages nettle)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu)
+  #:use-module (distro packages multiprecision)
+  #:use-module (distro packages m4))
+
+(define-public nettle
+  (package
+    (name "nettle")
+    (version "2.5")
+    (source
+     (origin
+      (method url-fetch)
+      (uri (string-append
+            "mirror://gnu/nettle/nettle-"
+            version
+            ".tar.gz"))
+      (sha256
+       (base32
+        "0wicr7amx01l03rm0pzgr1qvw3f9blaw17vjsy1301dh13ll58aa"))))
+    (build-system gnu-build-system)
+    (inputs `(("m4" ,m4)))
+    (propagated-inputs `(("gmp" ,gmp)))
+    (home-page
+     "http://www.lysator.liu.se/~nisse/nettle/")
+    (synopsis "GNU Nettle, a cryptographic library")
+    (description
+     "Nettle is a cryptographic library that is designed to fit easily
+in more or less any context: In crypto toolkits for object-oriented
+languages (C++, Python, Pike, ...), in applications like LSH or GNUPG,
+or even in kernel space.  In most contexts, you need more than the basic
+cryptographic algorithms, you also need some way to keep track of
+available algorithms, their properties and variants.  You often have
+some algorithm selection process, often dictated by a protocol you want
+to implement.
+
+And as the requirements of applications differ in subtle and not so
+subtle ways, an API that fits one application well can be a pain to use
+in a different context.  And that is why there are so many different
+cryptographic libraries around.  \nNettle tries to avoid this problem by
+doing one thing, the low-level crypto stuff, and providing a simple but
+general interface to it.  In particular, Nettle doesn't do algorithm
+selection.  It doesn't do memory allocation. It doesn't do any I/O.")
+    (license "GPLv2+")))