Remove encryption

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Gemfile

@@ -200,7 +200,6 @@ gem 'nprogress-rails'
 gem 'request_store'
 gem "virtus"
 gem 'addressable'
-gem 'simple_encrypt'
 
 group :development do
   gem 'brakeman', require: false

Gemfile.lock

@@ -551,7 +551,6 @@ GEM
       json
       redis (>= 3.0.6)
       redis-namespace (>= 1.3.1)
-    simple_encrypt (0.0.1)
     simple_oauth (0.1.9)
     simplecov (0.9.0)
       docile (~> 1.1.0)
@@ -775,7 +774,6 @@ DEPENDENCIES
   settingslogic
   shoulda-matchers (~> 2.7.0)
   sidekiq (~> 3.3)
-  simple_encrypt
   simplecov
   sinatra
   six

app/helpers/version_check_helper.rb

 module VersionCheckHelper
   def version_status_badge
-    if File.exists?(Rails.root.join('safe', 'public.pem'))
-      image_tag VersionCheck.new.url
-    end
+    image_tag VersionCheck.new.url
   end
 end

lib/version_check.rb

-# This class is used to encrypt GitLab version and URL
-# with public key when we send it to version.gitlab.com to
+require "base64"
+
+# This class is used to build image URL to
 # check if it is a new version for update
 class VersionCheck
-  include SimpleEncrypt
-
-  def public_key
-    public_key_file = Rails.root.join('safe', 'public.pem').to_s
-    File.read(public_key_file)
-  end
-
   def data
-    {
-      version: Gitlab::VERSION,
-      url: Gitlab.config.gitlab.url
-    }
-  end
-
-  def encrypt(string)
-    encrypt_with_public_key(string, public_key)
+    { version: Gitlab::VERSION }
   end
 
   def url
-    "#{host}?gitlab_info=#{encrypt(data.to_json)}"
+    encoded_data = Base64.urlsafe_encode64(data.to_json)
+    "#{host}?gitlab_info=#{encoded_data}"
   end
 
   def host