aes_decryptor.cc revision a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7
1ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch// Copyright 2013 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5ba5b9a6411cb1792fd21f0a078d7a25cd1ceec16Ben Murdoch#include "media/cdm/aes_decryptor.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 7a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)#include <list> 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <vector> 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/stl_util.h" 12868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#include "base/strings/string_number_conversions.h" 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "crypto/encryptor.h" 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "crypto/symmetric_key.h" 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/audio_decoder_config.h" 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/decoder_buffer.h" 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/decrypt_config.h" 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/video_decoder_config.h" 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/video_frame.h" 20f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)#include "media/cdm/json_web_key.h" 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace media { 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 24a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)// Keeps track of the session IDs and DecryptionKeys. The keys are ordered by 25a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)// insertion time (last insertion is first). It takes ownership of the 26a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)// DecryptionKeys. 27a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)class AesDecryptor::SessionIdDecryptionKeyMap { 28a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // Use a std::list to actually hold the data. Insertion is always done 29a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // at the front, so the "latest" decryption key is always the first one 30a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // in the list. 31a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) typedef std::list<std::pair<uint32, DecryptionKey*> > KeyList; 32a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 33a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) public: 34a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) SessionIdDecryptionKeyMap() {} 35a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) ~SessionIdDecryptionKeyMap() { STLDeleteValues(&key_list_); } 36a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 37a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // Replaces value if |session_id| is already present, or adds it if not. 38a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // This |decryption_key| becomes the latest until another insertion or 39a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // |session_id| is erased. 40a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) void Insert(uint32 session_id, scoped_ptr<DecryptionKey> decryption_key); 41a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 42a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // Deletes the entry for |session_id| if present. 43a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) void Erase(const uint32 session_id); 44a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 45a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // Returns whether the list is empty 46a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) bool Empty() const { return key_list_.empty(); } 47a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 48a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // Returns the last inserted DecryptionKey. 49a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) DecryptionKey* LatestDecryptionKey() { 50a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) DCHECK(!key_list_.empty()); 51a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) return key_list_.begin()->second; 52a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) } 53a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 54a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) private: 55a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // Searches the list for an element with |session_id|. 56a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) KeyList::iterator Find(const uint32 session_id); 57a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 58a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // Deletes the entry pointed to by |position|. 59a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) void Erase(KeyList::iterator position); 60a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 61a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) KeyList key_list_; 62a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 63a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) DISALLOW_COPY_AND_ASSIGN(SessionIdDecryptionKeyMap); 64a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)}; 65a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 66a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)void AesDecryptor::SessionIdDecryptionKeyMap::Insert( 67a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) uint32 session_id, 68a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) scoped_ptr<DecryptionKey> decryption_key) { 69a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) KeyList::iterator it = Find(session_id); 70a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) if (it != key_list_.end()) 71a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) Erase(it); 72a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) DecryptionKey* raw_ptr = decryption_key.release(); 73a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) key_list_.push_front(std::make_pair(session_id, raw_ptr)); 74a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)} 75a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 76a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)void AesDecryptor::SessionIdDecryptionKeyMap::Erase(const uint32 session_id) { 77a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) KeyList::iterator it = Find(session_id); 78a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) if (it == key_list_.end()) 79a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) return; 80a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) Erase(it); 81a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)} 82a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 83a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)AesDecryptor::SessionIdDecryptionKeyMap::KeyList::iterator 84a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)AesDecryptor::SessionIdDecryptionKeyMap::Find(const uint32 session_id) { 85a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) for (KeyList::iterator it = key_list_.begin(); it != key_list_.end(); ++it) { 86a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) if (it->first == session_id) 87a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) return it; 88a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) } 89a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) return key_list_.end(); 90a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)} 91a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 92a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)void AesDecryptor::SessionIdDecryptionKeyMap::Erase( 93a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) KeyList::iterator position) { 94a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) DCHECK(position->second); 95a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) delete position->second; 96a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) key_list_.erase(position); 97a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)} 98a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 99a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)uint32 AesDecryptor::next_web_session_id_ = 1; 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)enum ClearBytesBufferSel { 1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) kSrcContainsClearBytes, 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) kDstContainsClearBytes 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void CopySubsamples(const std::vector<SubsampleEntry>& subsamples, 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const ClearBytesBufferSel sel, 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8* src, 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8* dst) { 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < subsamples.size(); i++) { 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const SubsampleEntry& subsample = subsamples[i]; 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (sel == kSrcContainsClearBytes) { 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) src += subsample.clear_bytes; 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) dst += subsample.clear_bytes; 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memcpy(dst, src, subsample.cypher_bytes); 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) src += subsample.cypher_bytes; 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) dst += subsample.cypher_bytes; 1205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Decrypts |input| using |key|. Returns a DecoderBuffer with the decrypted 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// data if decryption succeeded or NULL if decryption failed. 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static scoped_refptr<DecoderBuffer> DecryptData(const DecoderBuffer& input, 1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) crypto::SymmetricKey* key) { 127ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch CHECK(input.data_size()); 128ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch CHECK(input.decrypt_config()); 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CHECK(key); 1305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) crypto::Encryptor encryptor; 1325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!encryptor.Init(key, crypto::Encryptor::CTR, "")) { 1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Could not initialize decryptor."; 1345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 1355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 137ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch DCHECK_EQ(input.decrypt_config()->iv().size(), 1385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) static_cast<size_t>(DecryptConfig::kDecryptionKeySize)); 139ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch if (!encryptor.SetCounter(input.decrypt_config()->iv())) { 1405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Could not set counter block."; 1415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 1425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 144ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch const int data_offset = input.decrypt_config()->data_offset(); 1455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const char* sample = 146ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch reinterpret_cast<const char*>(input.data() + data_offset); 147f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) DCHECK_GT(input.data_size(), data_offset); 148f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) size_t sample_size = static_cast<size_t>(input.data_size() - data_offset); 1495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 150f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) DCHECK_GT(sample_size, 0U) << "No sample data to be decrypted."; 151f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (sample_size == 0) 152a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) return NULL; 153a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) 154ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch if (input.decrypt_config()->subsamples().empty()) { 1555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::string decrypted_text; 1565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::StringPiece encrypted_text(sample, sample_size); 1575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!encryptor.Decrypt(encrypted_text, &decrypted_text)) { 1585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Could not decrypt data."; 1595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 1605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(xhwang): Find a way to avoid this data copy. 1635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return DecoderBuffer::CopyFrom( 1645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const uint8*>(decrypted_text.data()), 1655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) decrypted_text.size()); 1665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const std::vector<SubsampleEntry>& subsamples = 169ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch input.decrypt_config()->subsamples(); 1705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 171f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) size_t total_clear_size = 0; 172f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) size_t total_encrypted_size = 0; 1735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < subsamples.size(); i++) { 1745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) total_clear_size += subsamples[i].clear_bytes; 1755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) total_encrypted_size += subsamples[i].cypher_bytes; 176f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) // Check for overflow. This check is valid because *_size is unsigned. 177f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) DCHECK(total_clear_size >= subsamples[i].clear_bytes); 178f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (total_encrypted_size < subsamples[i].cypher_bytes) 179f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) return NULL; 1805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 181f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) size_t total_size = total_clear_size + total_encrypted_size; 182f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (total_size < total_clear_size || total_size != sample_size) { 1835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Subsample sizes do not equal input size"; 1845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 1855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 187a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // No need to decrypt if there is no encrypted data. 188a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) if (total_encrypted_size <= 0) { 189a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) return DecoderBuffer::CopyFrom(reinterpret_cast<const uint8*>(sample), 190a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) sample_size); 191a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) } 192a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) 1935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The encrypted portions of all subsamples must form a contiguous block, 1945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // such that an encrypted subsample that ends away from a block boundary is 1955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // immediately followed by the start of the next encrypted subsample. We 1965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // copy all encrypted subsamples to a contiguous buffer, decrypt them, then 1975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // copy the decrypted bytes over the encrypted bytes in the output. 1985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(strobe): attempt to reduce number of memory copies 199c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) scoped_ptr<uint8[]> encrypted_bytes(new uint8[total_encrypted_size]); 2005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CopySubsamples(subsamples, kSrcContainsClearBytes, 2015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const uint8*>(sample), encrypted_bytes.get()); 2025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::StringPiece encrypted_text( 2045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const char*>(encrypted_bytes.get()), 2055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) total_encrypted_size); 2065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::string decrypted_text; 2075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!encryptor.Decrypt(encrypted_text, &decrypted_text)) { 2085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Could not decrypt data."; 2095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 2105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 211a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) DCHECK_EQ(decrypted_text.size(), encrypted_text.size()); 2125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) scoped_refptr<DecoderBuffer> output = DecoderBuffer::CopyFrom( 2145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const uint8*>(sample), sample_size); 2155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CopySubsamples(subsamples, kDstContainsClearBytes, 2165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const uint8*>(decrypted_text.data()), 217ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch output->writable_data()); 2185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return output; 2195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 221a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)AesDecryptor::AesDecryptor(const SessionCreatedCB& session_created_cb, 222a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) const SessionMessageCB& session_message_cb, 223a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) const SessionReadyCB& session_ready_cb, 224a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) const SessionClosedCB& session_closed_cb, 225a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) const SessionErrorCB& session_error_cb) 226a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) : session_created_cb_(session_created_cb), 227a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) session_message_cb_(session_message_cb), 228a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) session_ready_cb_(session_ready_cb), 229a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) session_closed_cb_(session_closed_cb), 230a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) session_error_cb_(session_error_cb) {} 2315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AesDecryptor::~AesDecryptor() { 233a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) key_map_.clear(); 2345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 236a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)bool AesDecryptor::CreateSession(uint32 session_id, 237a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) const std::string& type, 238a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) const uint8* init_data, 239a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) int init_data_length) { 240a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) std::string web_session_id_string(base::UintToString(next_web_session_id_++)); 2415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2427d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // For now, the AesDecryptor does not care about |type|; 2435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // just fire the event with the |init_data| as the request. 244eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch std::vector<uint8> message; 245eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch if (init_data && init_data_length) 246eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch message.assign(init_data, init_data + init_data_length); 2475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 248a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) session_created_cb_.Run(session_id, web_session_id_string); 249a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) session_message_cb_.Run(session_id, message, std::string()); 2505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 2515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 253a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)void AesDecryptor::UpdateSession(uint32 session_id, 254a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) const uint8* response, 255a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) int response_length) { 256a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) CHECK(response); 257a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) CHECK_GT(response_length, 0); 258a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // TODO(jrummell): Verify that the session for |session_id| exists. 259a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 260a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) std::string key_string(reinterpret_cast<const char*>(response), 261a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) response_length); 262f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) KeyIdAndKeyPairs keys; 263f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (!ExtractKeysFromJWKSet(key_string, &keys)) { 264a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) session_error_cb_.Run(session_id, MediaKeys::kUnknownError, 0); 265f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) return; 266f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) } 2675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 268f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) // Make sure that at least one key was extracted. 269f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (keys.empty()) { 270a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) session_error_cb_.Run(session_id, MediaKeys::kUnknownError, 0); 271f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) return; 272f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) } 273f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 274f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) for (KeyIdAndKeyPairs::iterator it = keys.begin(); it != keys.end(); ++it) { 275f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (it->second.length() != 27658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) static_cast<size_t>(DecryptConfig::kDecryptionKeySize)) { 27758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DVLOG(1) << "Invalid key length: " << key_string.length(); 278a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) session_error_cb_.Run(session_id, MediaKeys::kUnknownError, 0); 27958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return; 28058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 281a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) if (!AddDecryptionKey(session_id, it->first, it->second)) { 282a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) session_error_cb_.Run(session_id, MediaKeys::kUnknownError, 0); 28358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return; 28458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 28558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 2865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2872a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (!new_audio_key_cb_.is_null()) 2882a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) new_audio_key_cb_.Run(); 2895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2902a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (!new_video_key_cb_.is_null()) 2912a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) new_video_key_cb_.Run(); 2925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 293a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) session_ready_cb_.Run(session_id); 2945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 296a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)void AesDecryptor::ReleaseSession(uint32 session_id) { 297a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) DeleteKeysForSession(session_id); 298a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) session_closed_cb_.Run(session_id); 2995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 301eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen MurdochDecryptor* AesDecryptor::GetDecryptor() { 302868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) return this; 303868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)} 304868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) 3052a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void AesDecryptor::RegisterNewKeyCB(StreamType stream_type, 3062a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const NewKeyCB& new_key_cb) { 3075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) switch (stream_type) { 3085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) case kAudio: 3092a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) new_audio_key_cb_ = new_key_cb; 3105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 3115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) case kVideo: 3122a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) new_video_key_cb_ = new_key_cb; 3135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 3145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) default: 3155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED(); 3165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::Decrypt(StreamType stream_type, 3205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const scoped_refptr<DecoderBuffer>& encrypted, 3215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const DecryptCB& decrypt_cb) { 322ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch CHECK(encrypted->decrypt_config()); 3235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) scoped_refptr<DecoderBuffer> decrypted; 3255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // An empty iv string signals that the frame is unencrypted. 326ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch if (encrypted->decrypt_config()->iv().empty()) { 327ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch int data_offset = encrypted->decrypt_config()->data_offset(); 328ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch decrypted = DecoderBuffer::CopyFrom(encrypted->data() + data_offset, 329ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch encrypted->data_size() - data_offset); 3305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 331ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch const std::string& key_id = encrypted->decrypt_config()->key_id(); 3322a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) DecryptionKey* key = GetKey(key_id); 3332a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (!key) { 3342a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) DVLOG(1) << "Could not find a matching key for the given key ID."; 3352a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) decrypt_cb.Run(kNoKey, NULL); 3362a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return; 3372a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 3382a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 3395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) crypto::SymmetricKey* decryption_key = key->decryption_key(); 340868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) decrypted = DecryptData(*encrypted.get(), decryption_key); 341868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) if (!decrypted.get()) { 3425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Decryption failed."; 3435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) decrypt_cb.Run(kError, NULL); 3445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 3455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 348ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch decrypted->set_timestamp(encrypted->timestamp()); 349ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch decrypted->set_duration(encrypted->duration()); 3505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) decrypt_cb.Run(kSuccess, decrypted); 3515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::CancelDecrypt(StreamType stream_type) { 3545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Decrypt() calls the DecryptCB synchronously so there's nothing to cancel. 3555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3572a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void AesDecryptor::InitializeAudioDecoder(const AudioDecoderConfig& config, 3585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const DecoderInitCB& init_cb) { 3595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // AesDecryptor does not support audio decoding. 3605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) init_cb.Run(false); 3615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3632a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void AesDecryptor::InitializeVideoDecoder(const VideoDecoderConfig& config, 3645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const DecoderInitCB& init_cb) { 3655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // AesDecryptor does not support video decoding. 3665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) init_cb.Run(false); 3675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::DecryptAndDecodeAudio( 3705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const scoped_refptr<DecoderBuffer>& encrypted, 3715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const AudioDecodeCB& audio_decode_cb) { 3725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << "AesDecryptor does not support audio decoding"; 3735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::DecryptAndDecodeVideo( 3765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const scoped_refptr<DecoderBuffer>& encrypted, 3775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const VideoDecodeCB& video_decode_cb) { 3785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << "AesDecryptor does not support video decoding"; 3795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::ResetDecoder(StreamType stream_type) { 3825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << "AesDecryptor does not support audio/video decoding"; 3835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::DeinitializeDecoder(StreamType stream_type) { 3865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << "AesDecryptor does not support audio/video decoding"; 3875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 389a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)bool AesDecryptor::AddDecryptionKey(const uint32 session_id, 390a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) const std::string& key_id, 39158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) const std::string& key_string) { 39258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) scoped_ptr<DecryptionKey> decryption_key(new DecryptionKey(key_string)); 39358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!decryption_key) { 39458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DVLOG(1) << "Could not create key."; 39558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return false; 39658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 39758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 39858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!decryption_key->Init()) { 39958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DVLOG(1) << "Could not initialize decryption key."; 40058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return false; 40158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 40258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 4035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::AutoLock auto_lock(key_map_lock_); 404a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) KeyIdToSessionKeysMap::iterator key_id_entry = key_map_.find(key_id); 405a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) if (key_id_entry != key_map_.end()) { 406a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) key_id_entry->second->Insert(session_id, decryption_key.Pass()); 407a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) return true; 4085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 409a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 410a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // |key_id| not found, so need to create new entry. 411a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) scoped_ptr<SessionIdDecryptionKeyMap> inner_map( 412a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) new SessionIdDecryptionKeyMap()); 413a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) inner_map->Insert(session_id, decryption_key.Pass()); 414a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) key_map_.add(key_id, inner_map.Pass()); 41558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return true; 4165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AesDecryptor::DecryptionKey* AesDecryptor::GetKey( 4195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const std::string& key_id) const { 4205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::AutoLock auto_lock(key_map_lock_); 421a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) KeyIdToSessionKeysMap::const_iterator key_id_found = key_map_.find(key_id); 422a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) if (key_id_found == key_map_.end()) 4235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 4245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 425a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // Return the key from the "latest" session_id entry. 426a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) return key_id_found->second->LatestDecryptionKey(); 427a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)} 428a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 429a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)void AesDecryptor::DeleteKeysForSession(const uint32 session_id) { 430a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) base::AutoLock auto_lock(key_map_lock_); 431a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 432a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // Remove all keys associated with |session_id|. Since the data is optimized 433a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // for access in GetKey(), we need to look at each entry in |key_map_|. 434a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) KeyIdToSessionKeysMap::iterator it = key_map_.begin(); 435a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) while (it != key_map_.end()) { 436a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) it->second->Erase(session_id); 437a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) if (it->second->Empty()) { 438a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // Need to get rid of the entry for this key_id. This will mess up the 439a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // iterator, so we need to increment it first. 440a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) KeyIdToSessionKeysMap::iterator current = it; 441a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) ++it; 442a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) key_map_.erase(current); 443a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) } else { 444a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) ++it; 445a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) } 446a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) } 4475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AesDecryptor::DecryptionKey::DecryptionKey(const std::string& secret) 4505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : secret_(secret) { 4515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AesDecryptor::DecryptionKey::~DecryptionKey() {} 4545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool AesDecryptor::DecryptionKey::Init() { 4565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CHECK(!secret_.empty()); 4575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) decryption_key_.reset(crypto::SymmetricKey::Import( 4585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) crypto::SymmetricKey::AES, secret_)); 459c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (!decryption_key_) 4605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 4615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 4625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace media 465