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nixpkgs/nixos/modules/services/security/haveged.nix

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Nix

{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.haveged;
in
{
###### interface
options = {
services.haveged = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
Whether to enable to haveged entropy daemon, which refills
/dev/random when low.
'';
};
refill_threshold = mkOption {
type = types.int;
default = 1024;
description = ''
The number of bits of available entropy beneath which
haveged should refill the entropy pool.
'';
};
};
};
###### implementation
config = mkIf cfg.enable {
systemd.services.haveged =
{ description = "Entropy Harvesting Daemon";
unitConfig.Documentation = "man:haveged(8)";
wantedBy = [ "multi-user.target" ];
path = [ pkgs.haveged ];
serviceConfig =
{ Type = "forking";
ExecStart = "${pkgs.haveged}/sbin/haveged -w ${toString cfg.refill_threshold} -v 1";
PIDFile = "/run/haveged.pid";
};
};
};
}