Select HRNG type, rather than just yes or no

src/freedombone

 # See http://rcn-ee.net/deb/jessie-armhf/
 KERNEL_VERSION="v3.15.10-bone8"
 
-# Whether or not to use the beaglebone's hardware random number generator
-USE_HWRNG="yes"
+# The type of hardware random number generator being used
+# This can be empty, "beaglebone" or "onerng"
+HWRNG_TYPE=
 
 # Whether this system is being installed within a docker container
 INSTALLED_WITHIN_DOCKER="no"
   fi
 
   if [ -f $CONFIGURATION_FILE ]; then
+      if grep -q "HWRNG_TYPE" $CONFIGURATION_FILE; then
+          HWRNG_TYPE=$(grep "HWRNG_TYPE" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
+      fi
       if grep -q "MEDIAGOBLIN_DOMAIN_NAME" $CONFIGURATION_FILE; then
           MEDIAGOBLIN_DOMAIN_NAME=$(grep "MEDIAGOBLIN_DOMAIN_NAME" $CONFIGURATION_FILE | awk -F '=' '{print $2}')
       fi
   echo 'enable_zram' >> $COMPLETION_FILE
 }
 
+function install_onerng {
+  # TODO
+}
+
 function random_number_generator {
   if grep -Fxq "random_number_generator" $COMPLETION_FILE; then
       return
       # generator of the host system
       return
   fi
-  if [[ $USE_HWRNG == "yes" ]]; then
+
+  case $HWRNG_TYPE in
+    beaglebone)
     apt-get -y install rng-tools
     sed -i 's|#HRNGDEVICE=/dev/hwrng|HRNGDEVICE=/dev/hwrng|g' /etc/default/rng-tools
-  else
+    ;;
+    onerng)
+    install_onerng
+    ;;
+    *)
     apt-get -y install haveged
-  fi
+    ;;
+  esac
+
   echo 'random_number_generator' >> $COMPLETION_FILE
 }
 

src/freedombone-config

 MEDIAGOBLIN_DOMAIN_NAME=
 MEDIAGOBLIN_CODE=
 USB_DRIVE=/dev/sdb1
+HWRNG_TYPE=
 
 CONFIGURATION_FILE=
 
   if [ $MEDIAGOBLIN_CODE ]; then
       echo "MEDIAGOBLIN_CODE=$MEDIAGOBLIN_CODE" >> $CONFIGURATION_FILE
   fi
+  if [ $HWRNG_TYPE ]; then
+      echo "HWRNG=$HWRNG" >> $CONFIGURATION_FILE
+  fi
 }
 
 # test a domain name to see if it's valid
 
   data=$(tempfile 2>/dev/null)
   trap "rm -f $data" 0 1 2 5 15
+  dialog --backtitle "Random Number Generation" \
+      --radiolist "Type of RNG:" 17 40 3 \
+      1 Haveged on \
+      2 Beaglebone built-in HRNG off \
+      3 OneRNG off 2> $data
+  sel=$?
+  case $sel in
+      1) exit 0;;
+      255) exit 0;;
+  esac
+  case $(cat $data) in
+      2) HWRNG_TYPE="beaglebone";;
+      3) HWRNG_TYPE="onerng";;
+  esac
+  save_configuration_file
+
+  data=$(tempfile 2>/dev/null)
+  trap "rm -f $data" 0 1 2 5 15
   dialog --backtitle "Freedombone Configuration" \
       --radiolist "Where to download Debian packages from:" 25 45 49 \
       1 "Australia" off \