Use the NSS internal key slot for all temporary key operations

crypto/encryptor_nss.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/encryptor.h"
 
 #include <cryptohi.h>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 35 matching lines @@
                      const base::StringPiece& iv) {
   DCHECK(key);
   DCHECK(CBC == mode || CTR == mode) << "Unsupported mode of operation";
 
   key_ = key;
   mode_ = mode;
 
   if (mode == CBC && iv.size() != AES_BLOCK_SIZE)
     return false;
 
-  slot_.reset(PK11_GetBestSlot(GetMechanism(mode), NULL));
-  if (!slot_.get())
-    return false;
-
   switch (mode) {
     case CBC:
       SECItem iv_item;
       iv_item.type = siBuffer;
       iv_item.data = reinterpret_cast<unsigned char*>(
           const_cast<char *>(iv.data()));
       iv_item.len = iv.size();
 
       param_.reset(PK11_ParamFromIV(GetMechanism(mode), &iv_item));
       break;
@@ skipping 118 matching lines @@
 
   // Use |output_data| to mask |input|.
   MaskMessage(
       reinterpret_cast<uint8*>(const_cast<char*>(input.data())),
       input.length(), output_data, output_data);
   output->resize(input.length());
   return true;
 }
 
 }  // namespace crypto