Bumping default dh key lengths

doc/EN/beaglebone.txt

   -keyout /etc/ssl/private/$HOSTNAME.key \
   -out /etc/ssl/certs/$HOSTNAME.crt
 
-openssl dhparam -check -text -5 1024 -out /etc/ssl/certs/$HOSTNAME.dhparam
+openssl dhparam -check -text -5 2048 -out /etc/ssl/certs/$HOSTNAME.dhparam
 
 chmod 400 /etc/ssl/private/$HOSTNAME.key
 chmod 640 /etc/ssl/certs/$HOSTNAME.crt
 
 initialrepair_start() {
 echo "Starting $SERVICE..."
-su --command "screen -h 1024 -dmS ${SERVICE} ${INVOCATION}" root
+su --command "screen -h 2048 -dmS ${SERVICE} ${INVOCATION}" root
 }
 
 

src/freedombone

 IPFS_PORT=4001
 
 # Default diffie-hellman key length in bits
-DH_KEYLENGTH=1024
+DH_KEYLENGTH=2048
 
 # repo for atheros AR9271 wifi driver
 ATHEROS_WIFI_REPO='https://github.com/qca/open-ath9k-htc-firmware.git'

src/freedombone-addcert

 UNIT="Freedombone Unit"
 EXTENSIONS=""
 NODH=
-DH_KEYLENGTH=1024
+DH_KEYLENGTH=2048
 
 function show_help {
     echo ''

src/freedombone-config

     if [[ $INSTALLING_ON_BBB == "yes" ]]; then
         USB_DRIVE=/dev/sda1
         # here a short diffie-hellman key length is used, because otherwise creation of keys
-        # becomes impractically long on the beaglebone.
+        # becomes impractically long on the beaglebone. It is known (as of 2015) that
+        # 1024bit DH may be breakable, so this is really a tradeoff between security and the
+        # available hardware
         DH_KEYLENGTH=1024
     fi
     save_configuration_file

src/freedombone-sec

 REGENERATE_SSH_HOST_KEYS="no"
 REGENERATE_DH_KEYS="no"
 RESET_TRIPWIRE="no"
-DH_KEYLENGTH=1024
+DH_KEYLENGTH=2048
 
 function get_protocols_from_website {
   if [ ! -f $WEBSITES_DIRECTORY/$1 ]; then
       dialog --backtitle "Freedombone Security Configuration" \
              --title "Diffie-Hellman key length" \
              --radiolist "The smaller length is better suited to low power embedded systems:" 12 40 3 \
-             1 "1024 bits" off \
+             1 "1024 bits (WARNING: this may be insecure)" off \
              2 "2048 bits" on \
              3 "3072 bits" off 2> $data
       sel=$?