Cast: Reshuffle files under media/cast

media/cast/common/transport_encryption_handler.cc

 // Copyright 2014 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 "media/cast/transport/utility/transport_encryption_handler.h"
+#include "media/cast/common/transport_encryption_handler.h"
 
 #include "base/logging.h"
 #include "crypto/encryptor.h"
 #include "crypto/symmetric_key.h"
-#include "media/cast/transport/cast_transport_defines.h"
+#include "media/cast/net/cast_transport_defines.h"
+
+namespace {
+
+// Crypto.
+const size_t kAesBlockSize = 16;
+const size_t kAesKeySize = 16;
+
+std::string GetAesNonce(uint32 frame_id, const std::string& iv_mask) {
+  std::string aes_nonce(kAesBlockSize, 0);
+
+  // Serializing frame_id in big-endian order (aes_nonce[8] is the most
+  // significant byte of frame_id).
+  aes_nonce[11] = frame_id & 0xff;
+  aes_nonce[10] = (frame_id >> 8) & 0xff;
+  aes_nonce[9] = (frame_id >> 16) & 0xff;
+  aes_nonce[8] = (frame_id >> 24) & 0xff;
+
+  for (size_t i = 0; i < kAesBlockSize; ++i) {
+    aes_nonce[i] ^= iv_mask[i];
+  }
+  return aes_nonce;
+}
+
+}  // namespace
 
 namespace media {
 namespace cast {
-namespace transport {
 
 TransportEncryptionHandler::TransportEncryptionHandler()
     : key_(), encryptor_(), iv_mask_(), is_activated_(false) {}
 
 TransportEncryptionHandler::~TransportEncryptionHandler() {}
 
 bool TransportEncryptionHandler::Initialize(std::string aes_key,
                                             std::string aes_iv_mask) {
   is_activated_ = false;
   if (aes_iv_mask.size() == kAesKeySize && aes_key.size() == kAesKeySize) {
@@ skipping 28 matching lines @@
   }
   return true;
 }
 
 bool TransportEncryptionHandler::Decrypt(uint32 frame_id,
                                          const base::StringPiece& ciphertext,
                                          std::string* plaintext) {
   if (!is_activated_) {
     return false;
   }
-  if (!encryptor_->SetCounter(transport::GetAesNonce(frame_id, iv_mask_))) {
+  if (!encryptor_->SetCounter(GetAesNonce(frame_id, iv_mask_))) {
     NOTREACHED() << "Failed to set counter";
     return false;
   }
   if (!encryptor_->Decrypt(ciphertext, plaintext)) {
     VLOG(1) << "Decryption error";
     return false;
   }
   return true;
 }
 
-}  // namespace transport
 }  // namespace cast
 }  // namespace media