Update on feedback, update dbus API, add unit tests. TEST=manual,unit,BVT BUG=3628 323

secure_blob.h

 // Copyright (c) 2009-2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SECURE_BLOB_H_
 #define SECURE_BLOB_H_
 
-#include "chromeos/utility.h"
+#include <chromeos/utility.h>
 
 namespace cryptohome {
 
 typedef unsigned char SecureBlobElement;
 
 // SecureBlob erases the contents on destruction.  It does not guarantee erasure
 // on resize, assign, etc.
 class SecureBlob : public chromeos::Blob {
  public:
   SecureBlob();
   SecureBlob(chromeos::Blob::const_iterator begin,
              chromeos::Blob::const_iterator end);
   explicit SecureBlob(int size);
+  SecureBlob(const unsigned char* from, int from_length);
+  SecureBlob(const char* from, int from_length);
   virtual ~SecureBlob();
 
   void resize(size_type sz);
   void resize(size_type sz, const SecureBlobElement& x);
+
+  void* data();
+  const void* const_data() const;
 };
 
 }  // cryptohome
 
 #endif  // SECURE_BLOB_H_