gnu: Add libyubikey and ykclient.

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

gnu-system.am

@@ -279,6 +279,7 @@ GNU_SYSTEM_MODULES =				\
   gnu/packages/xdisorg.scm			\
   gnu/packages/xorg.scm				\
   gnu/packages/yasm.scm				\
+  gnu/packages/yubico.scm			\
   gnu/packages/zile.scm				\
   gnu/packages/zip.scm				\
   gnu/packages/zsh.scm				\

gnu/packages/yubico.scm

@@ -0,0 +1,76 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2014 Ludovic Courtès <ludo@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 yubico)
+  #:use-module (gnu packages)
+  #:use-module (guix licenses)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu)
+  #:use-module (gnu packages pkg-config)
+  #:use-module (gnu packages man)
+  #:use-module (gnu packages curl))
+
+(define-public libyubikey
+  (package
+    (name "libyubikey")
+    (version "1.12")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append
+                    "https://developers.yubico.com/yubico-c/Releases/"
+                    name "-" version ".tar.gz"))
+              (sha256
+               (base32
+                "1f0plzmr1gwry4rfgq9q70v6qwqny009hac289ad5m6sj7vqflxr"))))
+    (build-system gnu-build-system)
+    (synopsis "Development kit for the YubiKey authentication device")
+    (description
+     "This package contains a C library and command-line tools that make up
+the low-level development kit for the Yubico YubiKey authentication device.")
+    (home-page "https://developers.yubico.com/yubico-c/")
+    (license bsd-2)))
+
+(define-public ykclient
+  (package
+    (name "ykclient")
+    (version "2.13")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append
+                    "https://developers.yubico.com/yubico-c-client/Releases/"
+                    name "-" version ".tar.gz"))
+              (sha256
+               (base32
+                "1lw1j61rfjngs8vvv9m348zl4166zg24bq0dy72r44wiz79yic4j"))))
+    (build-system gnu-build-system)
+
+    ;; There's just one test, and it requires network access to access
+    ;; yubico.com, so skip it.
+    (arguments '(#:tests? #f))
+
+    (native-inputs `(("pkg-config" ,pkg-config)
+                     ("help2man" ,help2man)))
+    (inputs `(("curl" ,curl)))
+    (synopsis "C library to validate one-time-password YubiKeys")
+    (description
+     "YubiKey C Client Library (libykclient) is a C library used to validate a
+one-time-password (OTP) YubiKey against Yubico’s servers.  See the Yubico
+website for more information about Yubico and the YubiKey.")
+    (home-page "https://developers.yubico.com/yubico-c-client/")
+    (license bsd-2)))