More debugging in Magicsig class verify method

plugins/OStatus/classes/Magicsig.php

@@ -198,6 +198,7 @@ class Magicsig extends Managed_DataObject
 
         // parse components
         if (!preg_match('/RSA\.([^\.]+)\.([^\.]+)(.([^\.]+))?/', $text, $matches)) {
+            common_debug('Magicsig error: RSA key not found in provided string.');
             return false;
         }
 
@@ -214,6 +215,8 @@ class Magicsig extends Managed_DataObject
             $magic_sig->loadKey($mod, $private_exp, 'private');
         }
 
+        common_debug('Magicsig success: Public exponent from provided string: '.var_export($mod,true));
+
         return $magic_sig;
     }