ed25519 support

My attempt to get ed25519 support for the doors in the script.
Please check function and syntax!

README.md

@@ -29,6 +29,19 @@ Der Deamon besteht aus folgenden Dateien.
 * foodoor-ssh-wrapper
 * foodoor-update-keydb
 
+Zusätzlich sollte für das git-repo eine Config angelegt werden: 
+
+/root/.ssh/config
+```
+Host git.chaospott.de
+  User git
+  Port 2222
+  IdentityFile ~/.ssh/id_chaospott
+```
+
+Das IdentityFile ist der Deploy-SSH-Key, der im [Repo](https://git.chaospott.de/Chaospott/foodoor-keys) hinterlegt ist.
+
+
 ##Schüssel
 
 ###Schlüsselupdate

foodoor-update-keydb

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 set -e
 
 export PATH="/usr/bin:/bin:/usr/sbin:/sbin"
@@ -9,7 +9,7 @@ dest=/var/run/foodoor-keys
 if [ ! -e "${dest}/.git/config" ]
 then
     #echo "Repo does not exist, trying to clone..."
-    ( cd /var/run && git clone --quiet --single-branch --depth=1 luftschleuse@nordstern.chaospott.de:/home/luftschleuse/foodoor-keys "${dest}" )
+    ( cd /var/run && git clone --quiet --single-branch --depth=1 ssh://git.chaospott.de/Chaospott/foodoor-keys.git "${dest}" )
 else
     #echo "Repo exists, updating..."
     ( cd "${dest}" && git fetch --quiet && git merge --quiet origin/master master )
@@ -22,10 +22,13 @@ do
     find "${dest}/keys" -name '*.pub' | sort | \
         while read keyfile
         do
-            valid_key=$(ssh-keygen -l -f ${keyfile})
+			ssh-keygen -l -f ${keyfile} &> /dev/null
-            if [ "$?" -eq "0" ]; then
+			if [ $? -eq 0 ]; then
-                if [ $(echo "${valid_key}" | cut -d" " -f1) -lt "4096" ]; then
+				key_length=`ssh-keygen -l -f ${keyfile} | cut -d" " -f1`
-                    echo "Size of key ${keyfile} is less than 4096. Not adding it to key database." >&2
+				if ssh-keygen -l -f id_ed25519.pub| cut -d" " -f4 == "(ED25519)"; then
+					key_length += 3840
+				if [ ${key_length} -lt 4096 ]; then
+                    echo "Key size of key ${keyfile} not equal to 4096. Not adding it to key database." >&2
                     continue
                 fi
             fi