security: Construct KeyChain from configuration file.

Change-Id: Iaddac24e2c4e199fdde83fa1d0067a87e18729c4
Refs: #1532
diff --git a/tools/ndnsec-key-gen.hpp b/tools/ndnsec-key-gen.hpp
index 4781ddf..627af4b 100644
--- a/tools/ndnsec-key-gen.hpp
+++ b/tools/ndnsec-key-gen.hpp
@@ -79,7 +79,7 @@
 
         KeyChain keyChain;
 
-        Name keyName = keyChain.generateRSAKeyPair(Name(identityName), true, keySize);
+        Name keyName = keyChain.generateRsaKeyPair(Name(identityName), true, keySize);
 
         if (0 == keyName.size())
           return 1;