diff --git a/recreate_ssh_host_keys.sh b/recreate_ssh_host_keys.sh
index 034d41f..bfa39e8 100755
--- a/recreate_ssh_host_keys.sh
+++ b/recreate_ssh_host_keys.sh
@@ -4,6 +4,44 @@
 # recreate ssh host keys
 #
 
-while read line; do
-    echo $line
-done < /etc/ssh/sshd_config
+sshdconfig="/etc/ssh/sshd_config"
+
+if [ $(whoami) != "root" ]; then
+    echo "you need to be root"
+    exit 1
+fi
+
+if [ -r $sshdconfig ]; then
+    while read line; do
+        fletter=${line:0:1}
+        if [ -z $fletter ]; then
+            #empty line. skipping.
+            :
+        elif [ $fletter == "#" ]; then
+            #comment. skipping.
+            :
+        else
+            echo $line | grep "HostKey" >> /dev/null
+            if [ $? -eq 0 ]; then
+                file=$(echo $line | awk '{print $2}')
+                if [ $file != "${file/_dsa_/}" ]; then
+                    mv $file $file.old
+                    mv $file.pub $file.pub.old
+                    ssh-keygen -t dsa -f $file
+                elif [ $file != "${file/_ecdsa_/}" ]; then
+                    mv $file $file.old
+                    mv $file.pub $file.pub.old
+                    ssh-keygen -t ecdsa -f $file
+                elif [ $file != "${file/_rsa_/}" ]; then
+                    mv $file $file.old
+                    mv $file.pub $file.pub.old
+                    ssh-keygen -t rsa -f $file
+                fi
+            fi
+        fi
+    done < $sshdconfig
+    exit 0
+else
+    echo "$sshdconfig - file not found"
+    exit 1
+fi