add pbkdf2-sha512

utils/pkgs/ykfde/pbkdf2-sha512.nix

@@ -0,0 +1,19 @@
+{ stdenv, fetchurl, openssl }:
+
+stdenv.mkDerivation rec {
+  name = "pbkdf2-sha512";
+  version = "latest";
+  buildInputs = [openssl];
+    
+  src = fetchurl {
+    url = "https://raw.githubusercontent.com/NixOS/nixpkgs/master/nixos/modules/system/boot/pbkdf2-sha512.c";
+    sha256 = "0ky414spzpndiifk7wca3q3l9gzs1ksn763dmy48xdn3q0i75s9r";
+  };
+
+  unpackPhase = ":";
+  buildPhase = "cc -O3 -I${openssl.dev}/include -L${openssl.out}/lib ${src} -o pbkdf2-sha512 -lcrypto";
+  installPhase = ''
+    mkdir -p $out/bin
+    install -m755 pbkdf2-sha512 $out/bin/pbkdf2-sha512
+  '';
+}