aes_decryptor.cc revision f8ee788a64d60abd8f2d742a5fdedde054ecd910
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" 16f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles)#include "media/base/cdm_promise.h" 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/decoder_buffer.h" 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/decrypt_config.h" 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/video_decoder_config.h" 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/video_frame.h" 21f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)#include "media/cdm/json_web_key.h" 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace media { 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 25a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)// Keeps track of the session IDs and DecryptionKeys. The keys are ordered by 26a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)// insertion time (last insertion is first). It takes ownership of the 27a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)// DecryptionKeys. 28a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)class AesDecryptor::SessionIdDecryptionKeyMap { 29a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // Use a std::list to actually hold the data. Insertion is always done 30a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // at the front, so the "latest" decryption key is always the first one 31a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // in the list. 32f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) typedef std::list<std::pair<std::string, DecryptionKey*> > KeyList; 33a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 34a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) public: 35a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) SessionIdDecryptionKeyMap() {} 36a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) ~SessionIdDecryptionKeyMap() { STLDeleteValues(&key_list_); } 37a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 38a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // Replaces value if |session_id| is already present, or adds it if not. 39a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // This |decryption_key| becomes the latest until another insertion or 40a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // |session_id| is erased. 41f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) void Insert(const std::string& web_session_id, 42f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) scoped_ptr<DecryptionKey> decryption_key); 43a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 44a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // Deletes the entry for |session_id| if present. 45f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) void Erase(const std::string& web_session_id); 46a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 47a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // Returns whether the list is empty 48a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) bool Empty() const { return key_list_.empty(); } 49a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 50a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // Returns the last inserted DecryptionKey. 51a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) DecryptionKey* LatestDecryptionKey() { 52a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) DCHECK(!key_list_.empty()); 53a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) return key_list_.begin()->second; 54a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) } 55a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 56a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) private: 57f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) // Searches the list for an element with |web_session_id|. 58f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) KeyList::iterator Find(const std::string& web_session_id); 59a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 60a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // Deletes the entry pointed to by |position|. 61a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) void Erase(KeyList::iterator position); 62a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 63a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) KeyList key_list_; 64a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 65a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) DISALLOW_COPY_AND_ASSIGN(SessionIdDecryptionKeyMap); 66a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)}; 67a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 68a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)void AesDecryptor::SessionIdDecryptionKeyMap::Insert( 69f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) const std::string& web_session_id, 70a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) scoped_ptr<DecryptionKey> decryption_key) { 71f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) KeyList::iterator it = Find(web_session_id); 72a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) if (it != key_list_.end()) 73a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) Erase(it); 74a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) DecryptionKey* raw_ptr = decryption_key.release(); 75f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) key_list_.push_front(std::make_pair(web_session_id, raw_ptr)); 76a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)} 77a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 78f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles)void AesDecryptor::SessionIdDecryptionKeyMap::Erase( 79f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) const std::string& web_session_id) { 80f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) KeyList::iterator it = Find(web_session_id); 81a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) if (it == key_list_.end()) 82a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) return; 83a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) Erase(it); 84a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)} 85a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 86a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)AesDecryptor::SessionIdDecryptionKeyMap::KeyList::iterator 87f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles)AesDecryptor::SessionIdDecryptionKeyMap::Find( 88f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) const std::string& web_session_id) { 89a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) for (KeyList::iterator it = key_list_.begin(); it != key_list_.end(); ++it) { 90f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) if (it->first == web_session_id) 91a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) return it; 92a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) } 93a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) return key_list_.end(); 94a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)} 95a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 96a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)void AesDecryptor::SessionIdDecryptionKeyMap::Erase( 97a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) KeyList::iterator position) { 98a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) DCHECK(position->second); 99a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) delete position->second; 100a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) key_list_.erase(position); 101a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)} 102a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 103a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)uint32 AesDecryptor::next_web_session_id_ = 1; 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)enum ClearBytesBufferSel { 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) kSrcContainsClearBytes, 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) kDstContainsClearBytes 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void CopySubsamples(const std::vector<SubsampleEntry>& subsamples, 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const ClearBytesBufferSel sel, 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8* src, 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8* dst) { 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < subsamples.size(); i++) { 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const SubsampleEntry& subsample = subsamples[i]; 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (sel == kSrcContainsClearBytes) { 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) src += subsample.clear_bytes; 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) dst += subsample.clear_bytes; 1205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memcpy(dst, src, subsample.cypher_bytes); 1225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) src += subsample.cypher_bytes; 1235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) dst += subsample.cypher_bytes; 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Decrypts |input| using |key|. Returns a DecoderBuffer with the decrypted 1285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// data if decryption succeeded or NULL if decryption failed. 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static scoped_refptr<DecoderBuffer> DecryptData(const DecoderBuffer& input, 1305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) crypto::SymmetricKey* key) { 131ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch CHECK(input.data_size()); 132ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch CHECK(input.decrypt_config()); 1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CHECK(key); 1345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) crypto::Encryptor encryptor; 1365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!encryptor.Init(key, crypto::Encryptor::CTR, "")) { 1375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Could not initialize decryptor."; 1385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 1395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 141ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch DCHECK_EQ(input.decrypt_config()->iv().size(), 1425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) static_cast<size_t>(DecryptConfig::kDecryptionKeySize)); 143ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch if (!encryptor.SetCounter(input.decrypt_config()->iv())) { 1445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Could not set counter block."; 1455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 1465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1485d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) const char* sample = reinterpret_cast<const char*>(input.data()); 1495d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) size_t sample_size = static_cast<size_t>(input.data_size()); 1505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 151f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) DCHECK_GT(sample_size, 0U) << "No sample data to be decrypted."; 152f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (sample_size == 0) 153a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) return NULL; 154a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) 155ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch if (input.decrypt_config()->subsamples().empty()) { 1565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::string decrypted_text; 1575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::StringPiece encrypted_text(sample, sample_size); 1585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!encryptor.Decrypt(encrypted_text, &decrypted_text)) { 1595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Could not decrypt data."; 1605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 1615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(xhwang): Find a way to avoid this data copy. 1645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return DecoderBuffer::CopyFrom( 1655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const uint8*>(decrypted_text.data()), 1665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) decrypted_text.size()); 1675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const std::vector<SubsampleEntry>& subsamples = 170ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch input.decrypt_config()->subsamples(); 1715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 172f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) size_t total_clear_size = 0; 173f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) size_t total_encrypted_size = 0; 1745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < subsamples.size(); i++) { 1755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) total_clear_size += subsamples[i].clear_bytes; 1765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) total_encrypted_size += subsamples[i].cypher_bytes; 177f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) // Check for overflow. This check is valid because *_size is unsigned. 178f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) DCHECK(total_clear_size >= subsamples[i].clear_bytes); 179f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (total_encrypted_size < subsamples[i].cypher_bytes) 180f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) return NULL; 1815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 182f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) size_t total_size = total_clear_size + total_encrypted_size; 183f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (total_size < total_clear_size || total_size != sample_size) { 1845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Subsample sizes do not equal input size"; 1855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 1865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 188a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // No need to decrypt if there is no encrypted data. 189a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) if (total_encrypted_size <= 0) { 190a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) return DecoderBuffer::CopyFrom(reinterpret_cast<const uint8*>(sample), 191a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) sample_size); 192a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) } 193a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) 1945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The encrypted portions of all subsamples must form a contiguous block, 1955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // such that an encrypted subsample that ends away from a block boundary is 1965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // immediately followed by the start of the next encrypted subsample. We 1975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // copy all encrypted subsamples to a contiguous buffer, decrypt them, then 1985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // copy the decrypted bytes over the encrypted bytes in the output. 1995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(strobe): attempt to reduce number of memory copies 200c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) scoped_ptr<uint8[]> encrypted_bytes(new uint8[total_encrypted_size]); 2015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CopySubsamples(subsamples, kSrcContainsClearBytes, 2025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const uint8*>(sample), encrypted_bytes.get()); 2035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::StringPiece encrypted_text( 2055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const char*>(encrypted_bytes.get()), 2065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) total_encrypted_size); 2075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::string decrypted_text; 2085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!encryptor.Decrypt(encrypted_text, &decrypted_text)) { 2095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Could not decrypt data."; 2105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 2115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 212a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) DCHECK_EQ(decrypted_text.size(), encrypted_text.size()); 2135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) scoped_refptr<DecoderBuffer> output = DecoderBuffer::CopyFrom( 2155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const uint8*>(sample), sample_size); 2165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CopySubsamples(subsamples, kDstContainsClearBytes, 2175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const uint8*>(decrypted_text.data()), 218ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch output->writable_data()); 2195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return output; 2205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 222f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles)AesDecryptor::AesDecryptor(const SessionMessageCB& session_message_cb, 223f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) const SessionClosedCB& session_closed_cb) 224f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) : session_message_cb_(session_message_cb), 225f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) session_closed_cb_(session_closed_cb) { 226f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) DCHECK(!session_message_cb_.is_null()); 227f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) DCHECK(!session_closed_cb_.is_null()); 228f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles)} 2295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AesDecryptor::~AesDecryptor() { 231a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) key_map_.clear(); 2325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 234f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles)void AesDecryptor::CreateSession(const std::string& init_data_type, 235a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) const uint8* init_data, 236f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) int init_data_length, 237f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) SessionType session_type, 238f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) scoped_ptr<NewSessionCdmPromise> promise) { 239f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) std::string web_session_id(base::UintToString(next_web_session_id_++)); 240f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) valid_sessions_.insert(web_session_id); 241f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) 242f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) // For now, the AesDecryptor does not care about |init_data_type| or 243f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) // |session_type|; just resolve the promise and then fire a message event 244f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) // with the |init_data| as the request. 245f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) // TODO(jrummell): Validate |init_data_type| and |session_type|. 246eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch std::vector<uint8> message; 247eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch if (init_data && init_data_length) 248eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch message.assign(init_data, init_data + init_data_length); 2495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 250f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) promise->resolve(web_session_id); 251f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) 252f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) session_message_cb_.Run(web_session_id, message, GURL()); 2535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 255f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles)void AesDecryptor::LoadSession(const std::string& web_session_id, 256f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) scoped_ptr<NewSessionCdmPromise> promise) { 2575d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) // TODO(xhwang): Change this to NOTREACHED() when blink checks for key systems 2585d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) // that do not support loadSession. See http://crbug.com/342481 259f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) promise->reject(NOT_SUPPORTED_ERROR, 0, "LoadSession() is not supported."); 2605d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles)} 2615d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 262f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles)void AesDecryptor::UpdateSession(const std::string& web_session_id, 263a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) const uint8* response, 264f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) int response_length, 265f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) scoped_ptr<SimpleCdmPromise> promise) { 266a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) CHECK(response); 267a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) CHECK_GT(response_length, 0); 268f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) 269f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) // TODO(jrummell): Convert back to a DCHECK once prefixed EME is removed. 270f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) if (valid_sessions_.find(web_session_id) == valid_sessions_.end()) { 271f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) promise->reject(INVALID_ACCESS_ERROR, 0, "Session does not exist."); 272f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) return; 273f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) } 274a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 275a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) std::string key_string(reinterpret_cast<const char*>(response), 276a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) response_length); 277f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) 278f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) KeyIdAndKeyPairs keys; 279f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (!ExtractKeysFromJWKSet(key_string, &keys)) { 280f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) promise->reject( 281f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) INVALID_ACCESS_ERROR, 0, "response is not a valid JSON Web Key Set."); 282f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) return; 283f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) } 2845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 285f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) // Make sure that at least one key was extracted. 286f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (keys.empty()) { 287f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) promise->reject( 288f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) INVALID_ACCESS_ERROR, 0, "response does not contain any keys."); 289f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) return; 290f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) } 291f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 292f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) for (KeyIdAndKeyPairs::iterator it = keys.begin(); it != keys.end(); ++it) { 293f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (it->second.length() != 29458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) static_cast<size_t>(DecryptConfig::kDecryptionKeySize)) { 29558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DVLOG(1) << "Invalid key length: " << key_string.length(); 296f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) promise->reject(INVALID_ACCESS_ERROR, 0, "Invalid key length."); 29758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return; 29858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 299f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) if (!AddDecryptionKey(web_session_id, it->first, it->second)) { 300f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) promise->reject(INVALID_ACCESS_ERROR, 0, "Unable to add key."); 30158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return; 30258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 30358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 3045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3055d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) { 3065d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) base::AutoLock auto_lock(new_key_cb_lock_); 3075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3085d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (!new_audio_key_cb_.is_null()) 3095d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) new_audio_key_cb_.Run(); 3105d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 3115d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) if (!new_video_key_cb_.is_null()) 3125d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) new_video_key_cb_.Run(); 3135d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) } 3145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 315f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) promise->resolve(); 3165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 318f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles)void AesDecryptor::ReleaseSession(const std::string& web_session_id, 319f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) scoped_ptr<SimpleCdmPromise> promise) { 3205d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) // Validate that this is a reference to an active session and then forget it. 321f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) std::set<std::string>::iterator it = valid_sessions_.find(web_session_id); 322f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) // TODO(jrummell): Convert back to a DCHECK once prefixed EME is removed. 323f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) if (it == valid_sessions_.end()) { 324f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) promise->reject(INVALID_ACCESS_ERROR, 0, "Session does not exist."); 325f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) return; 326f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) } 327f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) 3285d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) valid_sessions_.erase(it); 3295d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 330f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) // Close the session. 331f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) DeleteKeysForSession(web_session_id); 332f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) promise->resolve(); 333f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) session_closed_cb_.Run(web_session_id); 3345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 336eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen MurdochDecryptor* AesDecryptor::GetDecryptor() { 337868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) return this; 338868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)} 339868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) 3402a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void AesDecryptor::RegisterNewKeyCB(StreamType stream_type, 3412a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const NewKeyCB& new_key_cb) { 3425d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) base::AutoLock auto_lock(new_key_cb_lock_); 3435d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) 3445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) switch (stream_type) { 3455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) case kAudio: 3462a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) new_audio_key_cb_ = new_key_cb; 3475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 3485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) case kVideo: 3492a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) new_video_key_cb_ = new_key_cb; 3505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 3515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) default: 3525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED(); 3535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::Decrypt(StreamType stream_type, 3575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const scoped_refptr<DecoderBuffer>& encrypted, 3585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const DecryptCB& decrypt_cb) { 359ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch CHECK(encrypted->decrypt_config()); 3605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) scoped_refptr<DecoderBuffer> decrypted; 3625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // An empty iv string signals that the frame is unencrypted. 363ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch if (encrypted->decrypt_config()->iv().empty()) { 3645d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) decrypted = DecoderBuffer::CopyFrom(encrypted->data(), 3655d1f7b1de12d16ceb2c938c56701a3e8bfa558f7Torne (Richard Coles) encrypted->data_size()); 3665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 367ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch const std::string& key_id = encrypted->decrypt_config()->key_id(); 3682a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) DecryptionKey* key = GetKey(key_id); 3692a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (!key) { 3702a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) DVLOG(1) << "Could not find a matching key for the given key ID."; 3712a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) decrypt_cb.Run(kNoKey, NULL); 3722a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return; 3732a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 3742a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 3755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) crypto::SymmetricKey* decryption_key = key->decryption_key(); 376868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) decrypted = DecryptData(*encrypted.get(), decryption_key); 377868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) if (!decrypted.get()) { 3785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Decryption failed."; 3795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) decrypt_cb.Run(kError, NULL); 3805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 3815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 384ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch decrypted->set_timestamp(encrypted->timestamp()); 385ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch decrypted->set_duration(encrypted->duration()); 3865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) decrypt_cb.Run(kSuccess, decrypted); 3875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::CancelDecrypt(StreamType stream_type) { 3905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Decrypt() calls the DecryptCB synchronously so there's nothing to cancel. 3915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3932a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void AesDecryptor::InitializeAudioDecoder(const AudioDecoderConfig& config, 3945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const DecoderInitCB& init_cb) { 3955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // AesDecryptor does not support audio decoding. 3965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) init_cb.Run(false); 3975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3992a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void AesDecryptor::InitializeVideoDecoder(const VideoDecoderConfig& config, 4005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const DecoderInitCB& init_cb) { 4015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // AesDecryptor does not support video decoding. 4025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) init_cb.Run(false); 4035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::DecryptAndDecodeAudio( 4065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const scoped_refptr<DecoderBuffer>& encrypted, 4075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const AudioDecodeCB& audio_decode_cb) { 4085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << "AesDecryptor does not support audio decoding"; 4095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::DecryptAndDecodeVideo( 4125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const scoped_refptr<DecoderBuffer>& encrypted, 4135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const VideoDecodeCB& video_decode_cb) { 4145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << "AesDecryptor does not support video decoding"; 4155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::ResetDecoder(StreamType stream_type) { 4185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << "AesDecryptor does not support audio/video decoding"; 4195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::DeinitializeDecoder(StreamType stream_type) { 4225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << "AesDecryptor does not support audio/video decoding"; 4235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 425f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles)bool AesDecryptor::AddDecryptionKey(const std::string& web_session_id, 426a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) const std::string& key_id, 42758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) const std::string& key_string) { 42858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) scoped_ptr<DecryptionKey> decryption_key(new DecryptionKey(key_string)); 42958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!decryption_key->Init()) { 43058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DVLOG(1) << "Could not initialize decryption key."; 43158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return false; 43258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 43358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 4345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::AutoLock auto_lock(key_map_lock_); 435a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) KeyIdToSessionKeysMap::iterator key_id_entry = key_map_.find(key_id); 436a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) if (key_id_entry != key_map_.end()) { 437f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) key_id_entry->second->Insert(web_session_id, decryption_key.Pass()); 438a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) return true; 4395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 440a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 441a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // |key_id| not found, so need to create new entry. 442a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) scoped_ptr<SessionIdDecryptionKeyMap> inner_map( 443a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) new SessionIdDecryptionKeyMap()); 444f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) inner_map->Insert(web_session_id, decryption_key.Pass()); 445a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) key_map_.add(key_id, inner_map.Pass()); 44658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return true; 4475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AesDecryptor::DecryptionKey* AesDecryptor::GetKey( 4505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const std::string& key_id) const { 4515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::AutoLock auto_lock(key_map_lock_); 452a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) KeyIdToSessionKeysMap::const_iterator key_id_found = key_map_.find(key_id); 453a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) if (key_id_found == key_map_.end()) 4545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 4555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 456a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // Return the key from the "latest" session_id entry. 457a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) return key_id_found->second->LatestDecryptionKey(); 458a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles)} 459a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 460f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles)void AesDecryptor::DeleteKeysForSession(const std::string& web_session_id) { 461a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) base::AutoLock auto_lock(key_map_lock_); 462a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) 463f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) // Remove all keys associated with |web_session_id|. Since the data is 464f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) // optimized for access in GetKey(), we need to look at each entry in 465f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) // |key_map_|. 466a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) KeyIdToSessionKeysMap::iterator it = key_map_.begin(); 467a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) while (it != key_map_.end()) { 468f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) it->second->Erase(web_session_id); 469a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) if (it->second->Empty()) { 470a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // Need to get rid of the entry for this key_id. This will mess up the 471a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) // iterator, so we need to increment it first. 472a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) KeyIdToSessionKeysMap::iterator current = it; 473a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) ++it; 474a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) key_map_.erase(current); 475a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) } else { 476a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) ++it; 477a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) } 478a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7Torne (Richard Coles) } 4795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AesDecryptor::DecryptionKey::DecryptionKey(const std::string& secret) 4825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : secret_(secret) { 4835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AesDecryptor::DecryptionKey::~DecryptionKey() {} 4865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool AesDecryptor::DecryptionKey::Init() { 4885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CHECK(!secret_.empty()); 4895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) decryption_key_.reset(crypto::SymmetricKey::Import( 4905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) crypto::SymmetricKey::AES, secret_)); 491c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (!decryption_key_) 4925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 4935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 4945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace media 497