This adds support for encrypted ONC import

crypto/symmetric_key_mac.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 <CommonCrypto/CommonCryptor.h>
 #include <CoreFoundation/CFString.h>
 #include <Security/cssm.h>
 
@@ skipping 129 matching lines @@
 // static
 SymmetricKey* SymmetricKey::Import(Algorithm algorithm,
                                    const std::string& raw_key) {
   return new SymmetricKey(raw_key.data(), raw_key.size() * 8);
 }
 
 SymmetricKey::SymmetricKey(const void* key_data, size_t key_size_in_bits)
     : key_(reinterpret_cast<const char*>(key_data), key_size_in_bits / 8) {
 }
 
-bool SymmetricKey::GetRawKey(std::string* raw_key) {
+bool SymmetricKey::GetRawKey(std::string* raw_key) const {
   *raw_key = key_;
   return true;
 }
 
 CSSM_DATA SymmetricKey::cssm_data() const {
   return StringToData(key_);
 }
 
 }  // namespace crypto