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diff --git a/jni/ruby/lib/webrick/httpauth/digestauth.rb b/jni/ruby/lib/webrick/httpauth/digestauth.rb
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+++ b/jni/ruby/lib/webrick/httpauth/digestauth.rb
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+#
+# httpauth/digestauth.rb -- HTTP digest access authentication
+#
+# Author: IPR -- Internet Programming with Ruby -- writers
+# Copyright (c) 2003 Internet Programming with Ruby writers.
+# Copyright (c) 2003 H.M.
+#
+# The original implementation is provided by H.M.
+#   URL: http://rwiki.jin.gr.jp/cgi-bin/rw-cgi.rb?cmd=view;name=
+#        %C7%A7%BE%DA%B5%A1%C7%BD%A4%F2%B2%FE%C2%A4%A4%B7%A4%C6%A4%DF%A4%EB
+#
+# $IPR: digestauth.rb,v 1.5 2003/02/20 07:15:47 gotoyuzo Exp $
+
+require 'webrick/config'
+require 'webrick/httpstatus'
+require 'webrick/httpauth/authenticator'
+require 'digest/md5'
+require 'digest/sha1'
+
+module WEBrick
+  module HTTPAuth
+
+    ##
+    # RFC 2617 Digest Access Authentication for WEBrick
+    #
+    # Use this class to add digest authentication to a WEBrick servlet.
+    #
+    # Here is an example of how to set up DigestAuth:
+    #
+    #   config = { :Realm => 'DigestAuth example realm' }
+    #
+    #   htdigest = WEBrick::HTTPAuth::Htdigest.new 'my_password_file'
+    #   htdigest.set_passwd config[:Realm], 'username', 'password'
+    #   htdigest.flush
+    #
+    #   config[:UserDB] = htdigest
+    #
+    #   digest_auth = WEBrick::HTTPAuth::DigestAuth.new config
+    #
+    # When using this as with a servlet be sure not to create a new DigestAuth
+    # object in the servlet's #initialize.  By default WEBrick creates a new
+    # servlet instance for every request and the DigestAuth object must be
+    # used across requests.
+
+    class DigestAuth
+      include Authenticator
+
+      AuthScheme = "Digest" # :nodoc:
+
+      ##
+      # Struct containing the opaque portion of the digest authentication
+
+      OpaqueInfo = Struct.new(:time, :nonce, :nc) # :nodoc:
+
+      ##
+      # Digest authentication algorithm
+
+      attr_reader :algorithm
+
+      ##
+      # Quality of protection.  RFC 2617 defines "auth" and "auth-int"
+
+      attr_reader :qop
+
+      ##
+      # Used by UserDB to create a digest password entry
+
+      def self.make_passwd(realm, user, pass)
+        pass ||= ""
+        Digest::MD5::hexdigest([user, realm, pass].join(":"))
+      end
+
+      ##
+      # Creates a new DigestAuth instance.  Be sure to use the same DigestAuth
+      # instance for multiple requests as it saves state between requests in
+      # order to perform authentication.
+      #
+      # See WEBrick::Config::DigestAuth for default configuration entries
+      #
+      # You must supply the following configuration entries:
+      #
+      # :Realm:: The name of the realm being protected.
+      # :UserDB:: A database of usernames and passwords.
+      #           A WEBrick::HTTPAuth::Htdigest instance should be used.
+
+      def initialize(config, default=Config::DigestAuth)
+        check_init(config)
+        @config                 = default.dup.update(config)
+        @algorithm              = @config[:Algorithm]
+        @domain                 = @config[:Domain]
+        @qop                    = @config[:Qop]
+        @use_opaque             = @config[:UseOpaque]
+        @use_next_nonce         = @config[:UseNextNonce]
+        @check_nc               = @config[:CheckNc]
+        @use_auth_info_header   = @config[:UseAuthenticationInfoHeader]
+        @nonce_expire_period    = @config[:NonceExpirePeriod]
+        @nonce_expire_delta     = @config[:NonceExpireDelta]
+        @internet_explorer_hack = @config[:InternetExplorerHack]
+
+        case @algorithm
+        when 'MD5','MD5-sess'
+          @h = Digest::MD5
+        when 'SHA1','SHA1-sess'  # it is a bonus feature :-)
+          @h = Digest::SHA1
+        else
+          msg = format('Algorithm "%s" is not supported.', @algorithm)
+          raise ArgumentError.new(msg)
+        end
+
+        @instance_key = hexdigest(self.__id__, Time.now.to_i, Process.pid)
+        @opaques = {}
+        @last_nonce_expire = Time.now
+        @mutex = Mutex.new
+      end
+
+      ##
+      # Authenticates a +req+ and returns a 401 Unauthorized using +res+ if
+      # the authentication was not correct.
+
+      def authenticate(req, res)
+        unless result = @mutex.synchronize{ _authenticate(req, res) }
+          challenge(req, res)
+        end
+        if result == :nonce_is_stale
+          challenge(req, res, true)
+        end
+        return true
+      end
+
+      ##
+      # Returns a challenge response which asks for for authentication
+      # information
+
+      def challenge(req, res, stale=false)
+        nonce = generate_next_nonce(req)
+        if @use_opaque
+          opaque = generate_opaque(req)
+          @opaques[opaque].nonce = nonce
+        end
+
+        param = Hash.new
+        param["realm"]  = HTTPUtils::quote(@realm)
+        param["domain"] = HTTPUtils::quote(@domain.to_a.join(" ")) if @domain
+        param["nonce"]  = HTTPUtils::quote(nonce)
+        param["opaque"] = HTTPUtils::quote(opaque) if opaque
+        param["stale"]  = stale.to_s
+        param["algorithm"] = @algorithm
+        param["qop"]    = HTTPUtils::quote(@qop.to_a.join(",")) if @qop
+
+        res[@response_field] =
+          "#{@auth_scheme} " + param.map{|k,v| "#{k}=#{v}" }.join(", ")
+        info("%s: %s", @response_field, res[@response_field]) if $DEBUG
+        raise @auth_exception
+      end
+
+      private
+
+      # :stopdoc:
+
+      MustParams = ['username','realm','nonce','uri','response']
+      MustParamsAuth = ['cnonce','nc']
+
+      def _authenticate(req, res)
+        unless digest_credentials = check_scheme(req)
+          return false
+        end
+
+        auth_req = split_param_value(digest_credentials)
+        if auth_req['qop'] == "auth" || auth_req['qop'] == "auth-int"
+          req_params = MustParams + MustParamsAuth
+        else
+          req_params = MustParams
+        end
+        req_params.each{|key|
+          unless auth_req.has_key?(key)
+            error('%s: parameter missing. "%s"', auth_req['username'], key)
+            raise HTTPStatus::BadRequest
+          end
+        }
+
+        if !check_uri(req, auth_req)
+          raise HTTPStatus::BadRequest
+        end
+
+        if auth_req['realm'] != @realm
+          error('%s: realm unmatch. "%s" for "%s"',
+                auth_req['username'], auth_req['realm'], @realm)
+          return false
+        end
+
+        auth_req['algorithm'] ||= 'MD5'
+        if auth_req['algorithm'].upcase != @algorithm.upcase
+          error('%s: algorithm unmatch. "%s" for "%s"',
+                auth_req['username'], auth_req['algorithm'], @algorithm)
+          return false
+        end
+
+        if (@qop.nil? && auth_req.has_key?('qop')) ||
+           (@qop && (! @qop.member?(auth_req['qop'])))
+          error('%s: the qop is not allowed. "%s"',
+                auth_req['username'], auth_req['qop'])
+          return false
+        end
+
+        password = @userdb.get_passwd(@realm, auth_req['username'], @reload_db)
+        unless password
+          error('%s: the user is not allowed.', auth_req['username'])
+          return false
+        end
+
+        nonce_is_invalid = false
+        if @use_opaque
+          info("@opaque = %s", @opaque.inspect) if $DEBUG
+          if !(opaque = auth_req['opaque'])
+            error('%s: opaque is not given.', auth_req['username'])
+            nonce_is_invalid = true
+          elsif !(opaque_struct = @opaques[opaque])
+            error('%s: invalid opaque is given.', auth_req['username'])
+            nonce_is_invalid = true
+          elsif !check_opaque(opaque_struct, req, auth_req)
+            @opaques.delete(auth_req['opaque'])
+            nonce_is_invalid = true
+          end
+        elsif !check_nonce(req, auth_req)
+          nonce_is_invalid = true
+        end
+
+        if /-sess$/i =~ auth_req['algorithm']
+          ha1 = hexdigest(password, auth_req['nonce'], auth_req['cnonce'])
+        else
+          ha1 = password
+        end
+
+        if auth_req['qop'] == "auth" || auth_req['qop'] == nil
+          ha2 = hexdigest(req.request_method, auth_req['uri'])
+          ha2_res = hexdigest("", auth_req['uri'])
+        elsif auth_req['qop'] == "auth-int"
+          ha2 = hexdigest(req.request_method, auth_req['uri'],
+                          hexdigest(req.body))
+          ha2_res = hexdigest("", auth_req['uri'], hexdigest(res.body))
+        end
+
+        if auth_req['qop'] == "auth" || auth_req['qop'] == "auth-int"
+          param2 = ['nonce', 'nc', 'cnonce', 'qop'].map{|key|
+            auth_req[key]
+          }.join(':')
+          digest     = hexdigest(ha1, param2, ha2)
+          digest_res = hexdigest(ha1, param2, ha2_res)
+        else
+          digest     = hexdigest(ha1, auth_req['nonce'], ha2)
+          digest_res = hexdigest(ha1, auth_req['nonce'], ha2_res)
+        end
+
+        if digest != auth_req['response']
+          error("%s: digest unmatch.", auth_req['username'])
+          return false
+        elsif nonce_is_invalid
+          error('%s: digest is valid, but nonce is not valid.',
+                auth_req['username'])
+          return :nonce_is_stale
+        elsif @use_auth_info_header
+          auth_info = {
+            'nextnonce' => generate_next_nonce(req),
+            'rspauth'   => digest_res
+          }
+          if @use_opaque
+            opaque_struct.time  = req.request_time
+            opaque_struct.nonce = auth_info['nextnonce']
+            opaque_struct.nc    = "%08x" % (auth_req['nc'].hex + 1)
+          end
+          if auth_req['qop'] == "auth" || auth_req['qop'] == "auth-int"
+            ['qop','cnonce','nc'].each{|key|
+              auth_info[key] = auth_req[key]
+            }
+          end
+          res[@resp_info_field] = auth_info.keys.map{|key|
+            if key == 'nc'
+              key + '=' + auth_info[key]
+            else
+              key + "=" + HTTPUtils::quote(auth_info[key])
+            end
+          }.join(', ')
+        end
+        info('%s: authentication succeeded.', auth_req['username'])
+        req.user = auth_req['username']
+        return true
+      end
+
+      def split_param_value(string)
+        ret = {}
+        while string.bytesize != 0
+          case string
+          when /^\s*([\w\-\.\*\%\!]+)=\s*\"((\\.|[^\"])*)\"\s*,?/
+            key = $1
+            matched = $2
+            string = $'
+            ret[key] = matched.gsub(/\\(.)/, "\\1")
+          when /^\s*([\w\-\.\*\%\!]+)=\s*([^,\"]*),?/
+            key = $1
+            matched = $2
+            string = $'
+            ret[key] = matched.clone
+          when /^s*^,/
+            string = $'
+          else
+            break
+          end
+        end
+        ret
+      end
+
+      def generate_next_nonce(req)
+        now = "%012d" % req.request_time.to_i
+        pk  = hexdigest(now, @instance_key)[0,32]
+        nonce = [now + ":" + pk].pack("m*").chop # it has 60 length of chars.
+        nonce
+      end
+
+      def check_nonce(req, auth_req)
+        username = auth_req['username']
+        nonce = auth_req['nonce']
+
+        pub_time, pk = nonce.unpack("m*")[0].split(":", 2)
+        if (!pub_time || !pk)
+          error("%s: empty nonce is given", username)
+          return false
+        elsif (hexdigest(pub_time, @instance_key)[0,32] != pk)
+          error("%s: invalid private-key: %s for %s",
+                username, hexdigest(pub_time, @instance_key)[0,32], pk)
+          return false
+        end
+
+        diff_time = req.request_time.to_i - pub_time.to_i
+        if (diff_time < 0)
+          error("%s: difference of time-stamp is negative.", username)
+          return false
+        elsif diff_time > @nonce_expire_period
+          error("%s: nonce is expired.", username)
+          return false
+        end
+
+        return true
+      end
+
+      def generate_opaque(req)
+        @mutex.synchronize{
+          now = req.request_time
+          if now - @last_nonce_expire > @nonce_expire_delta
+            @opaques.delete_if{|key,val|
+              (now - val.time) > @nonce_expire_period
+            }
+            @last_nonce_expire = now
+          end
+          begin
+            opaque = Utils::random_string(16)
+          end while @opaques[opaque]
+          @opaques[opaque] = OpaqueInfo.new(now, nil, '00000001')
+          opaque
+        }
+      end
+
+      def check_opaque(opaque_struct, req, auth_req)
+        if (@use_next_nonce && auth_req['nonce'] != opaque_struct.nonce)
+          error('%s: nonce unmatched. "%s" for "%s"',
+                auth_req['username'], auth_req['nonce'], opaque_struct.nonce)
+          return false
+        elsif !check_nonce(req, auth_req)
+          return false
+        end
+        if (@check_nc && auth_req['nc'] != opaque_struct.nc)
+          error('%s: nc unmatched."%s" for "%s"',
+                auth_req['username'], auth_req['nc'], opaque_struct.nc)
+          return false
+        end
+        true
+      end
+
+      def check_uri(req, auth_req)
+        uri = auth_req['uri']
+        if uri != req.request_uri.to_s && uri != req.unparsed_uri &&
+           (@internet_explorer_hack && uri != req.path)
+          error('%s: uri unmatch. "%s" for "%s"', auth_req['username'],
+                auth_req['uri'], req.request_uri.to_s)
+          return false
+        end
+        true
+      end
+
+      def hexdigest(*args)
+        @h.hexdigest(args.join(":"))
+      end
+
+      # :startdoc:
+    end
+
+    ##
+    # Digest authentication for proxy servers.  See DigestAuth for details.
+
+    class ProxyDigestAuth < DigestAuth
+      include ProxyAuthenticator
+
+      private
+      def check_uri(req, auth_req) # :nodoc:
+        return true
+      end
+    end
+  end
+end