diff --git a/lib/linzer/rsa.rb b/lib/linzer/rsa.rb
index e2d1e8c..77e3aef 100644
--- a/lib/linzer/rsa.rb
+++ b/lib/linzer/rsa.rb
@@ -10,6 +10,8 @@ def validate
 
       def sign(data)
         # XXX: should check if the key is usable for signing
+        puts "@material.respond_to?(:private?) # => #{@material.respond_to?(:private?)}"
+        puts "OpenSSL::VERSION # => #{OpenSSL::VERSION}"
         @material.sign(@params[:digest], data)
       end