Lazy-require OpenSSL. Skip entirely if SecureRandom is available.

activesupport/lib/active_support/secure_random.rb

-begin
-  require 'openssl'
-rescue LoadError
-end
-
 begin
   require 'securerandom'
 rescue LoadError
@@ -10,7 +5,7 @@
 
 module ActiveSupport
   if defined?(::SecureRandom)
-    # Use Ruby 1.9's SecureRandom library whenever possible.
+    # Use Ruby's SecureRandom library if available.
     SecureRandom = ::SecureRandom # :nodoc:
   else
     # = Secure random number generator interface.
@@ -64,6 +59,13 @@ module SecureRandom
       def self.random_bytes(n=nil)
         n ||= 16
 
+        unless defined? OpenSSL
+          begin
+            require 'openssl'
+          rescue LoadError
+          end
+        end
+
         if defined? OpenSSL::Random
           return OpenSSL::Random.random_bytes(n)
         end