GPG encrypt message/file

#!/bin/sh

#Script by Freddy87 ([email protected])
#provides option to gpg encrypt messages straight to file or gpg encrypt selected file

echo "Do you want to encrypt a (F)ile or (M)essage? "  #Option to encrypt file or message
read choice

option=$(echo $choice|sed 's/\(.*\)/\L\1/')  #converts input to lowercase for matching in if statement

if [ $option = "m" ]; then
   echo "Enter the message to encrypt: "         #creates file with message inside and encrypts it
   read message
   echo "Enter the name of the recipient: "
   read recipient
   echo "Enter the name of the output file: "
   read outfile
   echo "$message" | gpg -o "$outfile.gpg" --encrypt -r "$recipient"
elif [ $option = "f" ]; then
   echo "Enter the name of the file to encrypt: "        #Encrypts file (standard gpg but more user friendly)
   read file_name
   echo "Enter the recipient: "
   read recipient
   echo "Enter the name of the output file: "
   read outfile
   if [ -n "$outfile" ]; then
      gpg -o "$outfile.gpg" --encrypt -r "$recipient" "$file_name"
   elif [ -z "$outfile" ]; then
      gpg --encrypt -r "$recipient" "$file_name"      #if $outfile empty then overwrite
   fi
else
   echo "That is not a valid option"
fi