security: In Certificate, added getSubjectDescriptionList and getExtensionList.
diff --git a/include/ndn-cpp/security/certificate/certificate.hpp b/include/ndn-cpp/security/certificate/certificate.hpp
index bc6b355..025e420 100644
--- a/include/ndn-cpp/security/certificate/certificate.hpp
+++ b/include/ndn-cpp/security/certificate/certificate.hpp
@@ -52,6 +52,12 @@
    */
   void 
   addSubjectDescription(const CertificateSubjectDescription& description) { subjectDescriptionList_.push_back(description); }
+
+  const SubjectDescriptionList& 
+  getSubjectDescriptionList() const { return subjectDescriptionList_; }
+  
+  SubjectDescriptionList& 
+  getSubjectDescriptionList() { return subjectDescriptionList_; }
  
   /**
    * Add a certificate extension.
@@ -60,6 +66,12 @@
   void 
   addExtension(const CertificateExtension& extension) { extensionList_.push_back(extension); }
 
+  const ExtensionList&
+  getExtensionList() const { return extensionList_; }
+  
+  ExtensionList&
+  getExtensionList() { return extensionList_; }
+
   void 
   setNotBefore(const MillisecondsSince1970& notBefore) { notBefore_ = notBefore; }