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diff --git a/src/ceph/src/auth/AuthSessionHandler.h b/src/ceph/src/auth/AuthSessionHandler.h
new file mode 100644
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--- /dev/null
+++ b/src/ceph/src/auth/AuthSessionHandler.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2009 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+
+#ifndef CEPH_AUTHSESSIONHANDLER_H
+#define CEPH_AUTHSESSIONHANDLER_H
+
+#include "include/types.h"
+#include "Auth.h"
+
+#define SESSION_SIGNATURE_FAILURE -1
+
+// Defines the security applied to ongoing messages in a session, once the session is established. PLR
+
+class CephContext;
+class KeyServer;
+class Message;
+
+struct AuthSessionHandler {
+protected:
+  CephContext *cct;
+  int protocol;
+  CryptoKey key;
+
+public:
+  explicit AuthSessionHandler(CephContext *cct_) : cct(cct_), protocol(CEPH_AUTH_UNKNOWN) {}
+
+  AuthSessionHandler(CephContext *cct_, int protocol_, CryptoKey key_) : cct(cct_), 
+    protocol(protocol_), key(key_) {}
+  virtual ~AuthSessionHandler() { }
+
+  virtual bool no_security() = 0;
+  virtual int sign_message(Message *message) = 0;
+  virtual int check_message_signature(Message *message) = 0;
+  virtual int encrypt_message(Message *message) = 0;
+  virtual int decrypt_message(Message *message) = 0;
+
+  int get_protocol() {return protocol;}
+  CryptoKey get_key() {return key;}
+
+};
+
+extern AuthSessionHandler *get_auth_session_handler(CephContext *cct, int protocol, CryptoKey key,
+						    uint64_t features);
+
+#endif