Upgraded to open_id_authentication plugin at 00d8bc7f97 and unpacked ruby-openid gem version 2.1.2.

vendor/gems/ruby-openid-2.1.2/lib/hmac/sha2.rb

@@ -0,0 +1,25 @@
+require 'hmac/hmac'
+require 'digest/sha2'
+
+module HMAC
+  class SHA256 < Base
+    def initialize(key = nil)
+      super(Digest::SHA256, 64, 32, key)
+    end
+    public_class_method :new, :digest, :hexdigest
+  end
+
+  class SHA384 < Base
+    def initialize(key = nil)
+      super(Digest::SHA384, 128, 48, key)
+    end
+    public_class_method :new, :digest, :hexdigest
+  end
+
+  class SHA512 < Base
+    def initialize(key = nil)
+      super(Digest::SHA512, 128, 64, key)
+    end
+    public_class_method :new, :digest, :hexdigest
+  end
+end