add haveged: A simple entropy daemon

pkgs/tools/security/haveged/default.nix

@@ -0,0 +1,27 @@
+{ stdenv, fetchurl }:
+
+stdenv.mkDerivation rec {
+  name = "haveged-${version}";
+  version = "1.7c";
+
+  src = fetchurl {
+    url = "http://www.issihosts.com/haveged/haveged-${version}.tar.gz";
+    sha256 = "08gi3d9lbrllk5lyxw8l65py88xhia48w758lqjddh3gv7g7wfa0";
+  };
+
+  meta = {
+    description = "A simple entropy daemon";
+    longDescription = ''
+      The haveged project is an attempt to provide an easy-to-use, unpredictable
+      random number generator based upon an adaptation of the HAVEGE algorithm.
+      Haveged was created to remedy low-entropy conditions in the Linux random device
+      that can occur under some workloads, especially on headless servers. Current development
+      of haveged is directed towards improving overall reliablity and adaptability while minimizing
+      the barriers to using haveged for other tasks.
+    '';
+    homepage = http://www.issihosts.com/haveged/;
+    license = stdenv.lib.licenses.gpl3;
+    maintainers = stdenv.lib.maintainers.iElectric;
+    platforms = stdenv.lib.platforms.unix;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -1063,6 +1063,8 @@ let
   pigz = callPackage ../tools/compression/pigz { };
 
   haproxy = callPackage ../tools/networking/haproxy { };
+ 
+  haveged = callPackage ../tools/security/haveged { };
 
   hardlink = callPackage ../tools/system/hardlink { };