diff --git a/lib/qiniu/auth.rb b/lib/qiniu/auth.rb
index 19aeba1..04547d3 100755
--- a/lib/qiniu/auth.rb
+++ b/lib/qiniu/auth.rb
@@ -1,6 +1,8 @@
 # -*- encoding: utf-8 -*-
+# vim: sw=2 ts=2
 
 require 'hmac-sha1'
+require 'uri'
 
 require 'qiniu/exceptions'
 
@@ -12,8 +14,11 @@ module Qiniu
         include Utils
 
         def call_with_signature(url, data, retry_times = 0, options = {})
-          code, data, raw_headers = http_request url, data, options.merge({:qbox_signature_token => generate_qbox_signature(url, data, options[:mime])})
-          [code, data, raw_headers]
+          return Utils.http_request(
+            url,
+            data,
+            options.merge({:qbox_signature_token => generate_acctoken(url, data)})
+          )
         end # call_with_signature
 
         def request(url, data = nil, options = {})
@@ -61,6 +66,41 @@ module Qiniu
           return "#{download_url}&token=#{dntoken}"
         end # authorize_download_url
 
+        def generate_acctoken(url, body = '')
+          ### 提取AK/SK信息
+          access_key = Config.settings[:access_key]
+          secret_key = Config.settings[:secret_key]
+
+          ### 解析URL，生成待签名字符串
+          uri = URI.parse(url)
+          signing_str = uri.path
+
+          # 如有QueryString部分，则需要加上
+          query_string = uri.query
+          if query_string.is_a?(String) && !query_string.empty?
+            singin_str += '?' + query_string
+          end
+
+          # 追加换行符
+          signing_str += "\n"
+
+          # 如果有Body，则也加上
+          # （仅限于mime == "application/x-www-form-urlencoded"的情况）
+          if body.is_a?(String) && !body.empty?
+              signing_str += body 
+          end
+
+          ### 生成数字签名
+          sign = HMAC::SHA1.new(secret_key).update(signing_str).digest
+          encoded_sign = Utils.urlsafe_base64_encode(sign)
+
+          ### 生成管理授权凭证
+          acctoken = "#{access_key}:#{encoded_sign}"
+
+          ### 返回管理授权凭证
+          return acctoken
+        end # generate_acctoken
+
       end # class << self
 
     end # module Auth
diff --git a/lib/qiniu/utils.rb b/lib/qiniu/utils.rb
index 3dd3005..4b1f024 100755
--- a/lib/qiniu/utils.rb
+++ b/lib/qiniu/utils.rb
@@ -128,26 +128,5 @@ module Qiniu
         File.open(filepath, "rb") { |f| Zlib.crc32 f.read }
       end
 
-      def generate_qbox_signature(url, params, mime = nil)
-        access_key = Config.settings[:access_key]
-        secret_key = Config.settings[:secret_key]
-        uri = URI.parse(url)
-        signature = uri.path
-        query_string = uri.query
-        signature += '?' + query_string if !query_string.nil? && !query_string.empty?
-        signature += "\n"
-        if params.is_a?(Hash)
-            params_string = generate_query_string(params)
-            signature += params_string
-        end
-        if mime.is_a?(String) && mime == "application/x-www-form-urlencoded" && params.is_a?(String)
-            signature += params
-        end
-        hmac = HMAC::SHA1.new(secret_key)
-        hmac.update(signature)
-        encoded_digest = urlsafe_base64_encode(hmac.digest)
-        %Q(#{access_key}:#{encoded_digest})
-      end
-
     end # module Utils
 end # module Qiniu