Option to supress creation of DH parama

src/freedombone-addcert

 ORGANISATION="Freedombone"
 UNIT="Freedombone Unit"
 EXTENSIONS=""
+NODH=
 
 function show_help {
     echo ''
     echo '  -l --location [locn]       Optional location name'
     echo '  -o --organisation [name]   Optional organisation name'
     echo '  -u --unit [name]           Optional unit name'
+    echo '     --nodh                  Do not calculate DH params'
     echo '     --ca                    Certificate authority cert'
     echo ''
     exit 0
     --ca)
     EXTENSIONS="-extensions v3_ca"
     ;;
+    --nodh)
+    NODH="true"
+    ;;
     *)
     # unknown option
     ;;
 fi
 
 openssl req -x509 $EXTENSIONS -nodes -days 3650 -sha256 -subj "/O=$ORGANISATION/OU=$UNIT/C=$COUNTRY_CODE/ST=$AREA/L=$LOCATION/CN=$HOSTNAME" -newkey rsa:4096 -keyout /etc/ssl/private/$HOSTNAME.key -out /etc/ssl/certs/$HOSTNAME.crt
-openssl dhparam -check -text -5 1024 -out /etc/ssl/certs/$HOSTNAME.dhparam
+if [ ! $NODH ]; then
+    openssl dhparam -check -text -5 1024 -out /etc/ssl/certs/$HOSTNAME.dhparam
+fi
 chmod 400 /etc/ssl/private/$HOSTNAME.key
 chmod 640 /etc/ssl/certs/$HOSTNAME.crt
 chmod 640 /etc/ssl/certs/$HOSTNAME.dhparam

src/freedombone-clientcert

 chmod 600 /etc/dovecot/passwd-file
 
 # create a user cert
-freedombone-addcert -h $USERNAME
+freedombone-addcert -h $USERNAME --nodh
 
 # create a certificate request
 openssl req -new -sha256 -subj "/O=$ORGANISATION/OU=$UNIT/C=$COUNTRY_CODE/ST=$AREA/L=$LOCATION/CN=$USERNAME" -key /etc/ssl/private/$USERNAME.key -out /etc/ssl/requests/$USERNAME.csr
 
 # move the cert to the user's home
 mkdir /home/$USERNAME/emailcert
+shred -zu /etc/ssl/certs/$USERNAME.dhparam
 mv /etc/ssl/certs/$USERNAME.cer /home/$USERNAME/emailcert
 cp /etc/ssl/certs/dovecot-ca.crt /home/$USERNAME/emailcert
 mv /etc/ssl/private/$USERNAME.key /home/$USERNAME/emailcert