This adds support for encrypted ONC import

crypto/symmetric_key_openssl.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "crypto/symmetric_key.h"
 
 #include <openssl/evp.h>
 #include <openssl/rand.h>
 
 #include <algorithm>
@@ skipping 54 matching lines @@
 }
 
 // static
 SymmetricKey* SymmetricKey::Import(Algorithm algorithm,
                                    const std::string& raw_key) {
   scoped_ptr<SymmetricKey> key(new SymmetricKey);
   key->key_ = raw_key;
   return key.release();
 }
 
-bool SymmetricKey::GetRawKey(std::string* raw_key) {
+bool SymmetricKey::GetRawKey(std::string* raw_key) const {
   *raw_key = key_;
   return true;
 }
 
 }  // namespace crypto