15d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)// Copyright 2014 The Chromium Authors. All rights reserved. 25d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)// found in the LICENSE file. 45d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 55d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#include "media/cast/transport/utility/transport_encryption_handler.h" 65d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 75d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#include "base/logging.h" 85d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#include "crypto/encryptor.h" 95d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#include "crypto/symmetric_key.h" 105d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)#include "media/cast/transport/cast_transport_defines.h" 115d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 125d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)namespace media { 135d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)namespace cast { 145d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)namespace transport { 155d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 165d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)TransportEncryptionHandler::TransportEncryptionHandler() 175d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) : key_(), encryptor_(), iv_mask_(), initialized_(false) {} 185d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 195d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)TransportEncryptionHandler::~TransportEncryptionHandler() {} 205d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 215d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)bool TransportEncryptionHandler::Initialize(std::string aes_key, 225d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) std::string aes_iv_mask) { 235d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) initialized_ = false; 245d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (aes_iv_mask.size() == kAesKeySize && aes_key.size() == kAesKeySize) { 255d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) iv_mask_ = aes_iv_mask; 265d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) key_.reset( 275d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) crypto::SymmetricKey::Import(crypto::SymmetricKey::AES, aes_key)); 285d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) encryptor_.reset(new crypto::Encryptor()); 295d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) encryptor_->Init(key_.get(), crypto::Encryptor::CTR, std::string()); 305d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) initialized_ = true; 315d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) } else if (aes_iv_mask.size() != 0 || aes_key.size() != 0) { 325d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) DCHECK_EQ(aes_iv_mask.size(), 0u) 335d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) << "Invalid Crypto configuration: aes_iv_mask.size"; 345d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) DCHECK_EQ(aes_key.size(), 0u) 355d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) << "Invalid Crypto configuration: aes_key.size"; 365d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) return false; 375d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) } 385d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) return true; 395d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)} 405d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 415d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)bool TransportEncryptionHandler::Encrypt(uint32 frame_id, 42effb81e5f8246d0db0270817048dc992db66e9fbBen Murdoch const base::StringPiece& data, 435d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) std::string* encrypted_data) { 445d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (!initialized_) 455d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) return false; 465d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (!encryptor_->SetCounter(GetAesNonce(frame_id, iv_mask_))) { 475d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) NOTREACHED() << "Failed to set counter"; 485d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) return false; 495d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) } 505d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (!encryptor_->Encrypt(data, encrypted_data)) { 515d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) NOTREACHED() << "Encrypt error"; 525d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) return false; 535d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) } 545d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) return true; 555d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)} 565d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 575d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)bool TransportEncryptionHandler::Decrypt(uint32 frame_id, 585d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) const base::StringPiece& ciphertext, 595d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) std::string* plaintext) { 605d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (!initialized_) { 615d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) return false; 625d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) } 635d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (!encryptor_->SetCounter(transport::GetAesNonce(frame_id, iv_mask_))) { 645d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) NOTREACHED() << "Failed to set counter"; 655d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) return false; 665d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) } 675d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (!encryptor_->Decrypt(ciphertext, plaintext)) { 685d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) VLOG(1) << "Decryption error"; 695d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) return false; 705d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) } 715d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) return true; 725d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)} 735d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 745d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)} // namespace transport 755d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)} // namespace cast 765d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)} // namespace media 77