Careful, will encrypt all files in directory except itself.

Ruby Encryptor.rb

require 'aes'
require "base64"

def fileEncrypt(file, key)
    handler = File.open(file, 'rb')
    data = handler.read
    handler.close
    writefile = File.open(file, "wb")
    encryptedContent = AES.encrypt(data, key)
    writefile.puts encryptedContent
    writefile.close
    keystore = File.open("Keystore.txt", "wb")
    keystore.puts key
    keystore.close
end

def fileDecrypt(file, key)
    handler = File.open(file, 'rb')
    data = handler.read
    handler.close
    writefile = File.open(file, "wb")
    decryptedContent = AES.decrypt(data, key)
    writefile.puts decryptedContent
    writefile.close
end


files = Dir.glob("*")
files.delete("Encrypt.rb")
files.delete("Keystore.txt")
files.delete("Gemfile")
files.delete("Encryptor.exe")

print "Encrypt? Y/N: "
mode = gets.chomp
if(mode == "Y") 
    key = AES.key
    files.each do |filename|
        fileEncrypt(filename, key)
        puts "Encrypted #{filename}"
    end
    puts "Key: #{key}"
    puts "Also saved in Keystore.txt"
    gets
elsif(mode == "N")
    print "Decrypt? Y/N: "
    mode = gets.chomp
    if(mode == "Y")
        if(File.file?("Keystore.txt"))
            print "Load key from Keystore? Y/N: "
            mode == gets.chomp
            if(mode == "Y")
                handler = File.open("Keystore.txt", 'rb')
                key = handler.read
                handler.close
            else
                print "Key: "
                key = gets.chomp
            end
        else
            print "Key: "
            key = gets.chomp    
        end
        files.each do |filename|
            fileDecrypt(filename, key)
            puts "Decrypted #{filename}"
        end
        puts "Done"
        gets
    end
end