RSA Encrypt & Decrypt in Ruby

Well I finished the encrypt with RSA on ruby some hours ago and felt like sharing. :)

Case you feel like doing something back for me just download the latest release of my beta twitter client and send me some comments to my email. It's pretty hard to test something when my environment is completely contaminated!

 require 'openssl'
 require 'Base64'

 class Rudolph
   class Crypt
     def initialize data_path
       @data_path = data_path
       @private   = get_key 'id_rsa'
       @public    = get_key 'id_rsa.pub'
     end

     def encrypt_string message
       Base64::encode64(@public.public_encrypt(message)).rstrip
     end

     def decrypt_string message
       @private.private_decrypt Base64::decode64(message)
     end

     def self.generate_keys data_path
       rsa_path = File.join(data_path, 'rsa')
       privkey  = File.join(rsa_path, 'id_rsa')
       pubkey   = File.join(rsa_path, 'id_rsa.pub')
       unless File.exists?(privkey) || File.exists?(pubkey)
         keypair  = OpenSSL::PKey::RSA.generate(1024)
         Dir.mkdir(rsa_path) unless File.exist?(rsa_path)
         File.open(privkey, 'w') { |f| f.write keypair.to_pem } unless File.exists? privkey
         File.open(pubkey, 'w') { |f| f.write keypair.public_key.to_pem } unless File.exists? pubkey
       end
     end

     private
     def get_key filename
       OpenSSL::PKey::RSA.new File.read(File.join(@data_path, 'rsa', filename))
     end
   end
 end