aes_decryptor.cc revision f2477e01787aa58f445919b809d89e252beef54f
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) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <vector> 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/stl_util.h" 11868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#include "base/strings/string_number_conversions.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "crypto/encryptor.h" 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "crypto/symmetric_key.h" 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/audio_decoder_config.h" 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/decoder_buffer.h" 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/decrypt_config.h" 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/video_decoder_config.h" 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/video_frame.h" 19f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)#include "media/cdm/json_web_key.h" 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace media { 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)uint32 AesDecryptor::next_session_id_ = 1; 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)enum ClearBytesBufferSel { 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) kSrcContainsClearBytes, 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) kDstContainsClearBytes 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void CopySubsamples(const std::vector<SubsampleEntry>& subsamples, 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const ClearBytesBufferSel sel, 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8* src, 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8* dst) { 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < subsamples.size(); i++) { 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const SubsampleEntry& subsample = subsamples[i]; 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (sel == kSrcContainsClearBytes) { 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) src += subsample.clear_bytes; 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) dst += subsample.clear_bytes; 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memcpy(dst, src, subsample.cypher_bytes); 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) src += subsample.cypher_bytes; 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) dst += subsample.cypher_bytes; 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Decrypts |input| using |key|. Returns a DecoderBuffer with the decrypted 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// data if decryption succeeded or NULL if decryption failed. 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static scoped_refptr<DecoderBuffer> DecryptData(const DecoderBuffer& input, 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) crypto::SymmetricKey* key) { 51ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch CHECK(input.data_size()); 52ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch CHECK(input.decrypt_config()); 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CHECK(key); 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) crypto::Encryptor encryptor; 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!encryptor.Init(key, crypto::Encryptor::CTR, "")) { 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Could not initialize decryptor."; 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 61ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch DCHECK_EQ(input.decrypt_config()->iv().size(), 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) static_cast<size_t>(DecryptConfig::kDecryptionKeySize)); 63ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch if (!encryptor.SetCounter(input.decrypt_config()->iv())) { 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Could not set counter block."; 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 68ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch const int data_offset = input.decrypt_config()->data_offset(); 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const char* sample = 70ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch reinterpret_cast<const char*>(input.data() + data_offset); 71f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) DCHECK_GT(input.data_size(), data_offset); 72f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) size_t sample_size = static_cast<size_t>(input.data_size() - data_offset); 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 74f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) DCHECK_GT(sample_size, 0U) << "No sample data to be decrypted."; 75f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (sample_size == 0) 76a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) return NULL; 77a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) 78ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch if (input.decrypt_config()->subsamples().empty()) { 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::string decrypted_text; 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::StringPiece encrypted_text(sample, sample_size); 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!encryptor.Decrypt(encrypted_text, &decrypted_text)) { 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Could not decrypt data."; 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(xhwang): Find a way to avoid this data copy. 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return DecoderBuffer::CopyFrom( 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const uint8*>(decrypted_text.data()), 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) decrypted_text.size()); 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const std::vector<SubsampleEntry>& subsamples = 93ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch input.decrypt_config()->subsamples(); 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 95f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) size_t total_clear_size = 0; 96f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) size_t total_encrypted_size = 0; 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < subsamples.size(); i++) { 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) total_clear_size += subsamples[i].clear_bytes; 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) total_encrypted_size += subsamples[i].cypher_bytes; 100f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) // Check for overflow. This check is valid because *_size is unsigned. 101f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) DCHECK(total_clear_size >= subsamples[i].clear_bytes); 102f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (total_encrypted_size < subsamples[i].cypher_bytes) 103f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) return NULL; 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 105f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) size_t total_size = total_clear_size + total_encrypted_size; 106f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (total_size < total_clear_size || total_size != sample_size) { 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Subsample sizes do not equal input size"; 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 111a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // No need to decrypt if there is no encrypted data. 112a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) if (total_encrypted_size <= 0) { 113a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) return DecoderBuffer::CopyFrom(reinterpret_cast<const uint8*>(sample), 114a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) sample_size); 115a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) } 116a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The encrypted portions of all subsamples must form a contiguous block, 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // such that an encrypted subsample that ends away from a block boundary is 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // immediately followed by the start of the next encrypted subsample. We 1205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // copy all encrypted subsamples to a contiguous buffer, decrypt them, then 1215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // copy the decrypted bytes over the encrypted bytes in the output. 1225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(strobe): attempt to reduce number of memory copies 123c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) scoped_ptr<uint8[]> encrypted_bytes(new uint8[total_encrypted_size]); 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CopySubsamples(subsamples, kSrcContainsClearBytes, 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const uint8*>(sample), encrypted_bytes.get()); 1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::StringPiece encrypted_text( 1285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const char*>(encrypted_bytes.get()), 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) total_encrypted_size); 1305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::string decrypted_text; 1315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!encryptor.Decrypt(encrypted_text, &decrypted_text)) { 1325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Could not decrypt data."; 1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 1345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 135a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) DCHECK_EQ(decrypted_text.size(), encrypted_text.size()); 1365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) scoped_refptr<DecoderBuffer> output = DecoderBuffer::CopyFrom( 1385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const uint8*>(sample), sample_size); 1395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CopySubsamples(subsamples, kDstContainsClearBytes, 1405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const uint8*>(decrypted_text.data()), 141ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch output->writable_data()); 1425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return output; 1435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1452a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)AesDecryptor::AesDecryptor(const KeyAddedCB& key_added_cb, 1462a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const KeyErrorCB& key_error_cb, 147f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) const KeyMessageCB& key_message_cb, 148f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) const SetSessionIdCB& set_session_id_cb) 1492a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) : key_added_cb_(key_added_cb), 1502a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) key_error_cb_(key_error_cb), 151f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) key_message_cb_(key_message_cb), 152f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) set_session_id_cb_(set_session_id_cb) {} 1535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AesDecryptor::~AesDecryptor() { 1555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) STLDeleteValues(&key_map_); 1565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 158f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)bool AesDecryptor::GenerateKeyRequest(uint32 reference_id, 159f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) const std::string& type, 1605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8* init_data, 1615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int init_data_length) { 1625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::string session_id_string(base::UintToString(next_session_id_++)); 1635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1647d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // For now, the AesDecryptor does not care about |type|; 1655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // just fire the event with the |init_data| as the request. 166eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch std::vector<uint8> message; 167eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch if (init_data && init_data_length) 168eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch message.assign(init_data, init_data + init_data_length); 1695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 170f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) set_session_id_cb_.Run(reference_id, session_id_string); 171f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) key_message_cb_.Run(reference_id, message, std::string()); 1725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 1735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 175f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)void AesDecryptor::AddKey(uint32 reference_id, 176f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) const uint8* key, 1775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int key_length, 1785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8* init_data, 179f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) int init_data_length) { 1805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CHECK(key); 1815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CHECK_GT(key_length, 0); 182f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) DCHECK(!init_data); 183f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) DCHECK_EQ(init_data_length, 0); 1845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 18558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // AddKey() is called from update(), where the key(s) are passed as a JSON 18658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // Web Key (JWK) set. Each JWK needs to be a symmetric key ('kty' = "oct"), 18758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // with 'kid' being the base64-encoded key id, and 'k' being the 18858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // base64-encoded key. 18958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) std::string key_string(reinterpret_cast<const char*>(key), key_length); 190f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) KeyIdAndKeyPairs keys; 191f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (!ExtractKeysFromJWKSet(key_string, &keys)) { 192f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) key_error_cb_.Run(reference_id, MediaKeys::kUnknownError, 0); 193f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) return; 194f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) } 1955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 196f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) // Make sure that at least one key was extracted. 197f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (keys.empty()) { 198f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) key_error_cb_.Run(reference_id, MediaKeys::kUnknownError, 0); 199f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) return; 200f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) } 201f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) 202f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) for (KeyIdAndKeyPairs::iterator it = keys.begin(); it != keys.end(); ++it) { 203f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (it->second.length() != 20458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) static_cast<size_t>(DecryptConfig::kDecryptionKeySize)) { 20558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DVLOG(1) << "Invalid key length: " << key_string.length(); 206f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) key_error_cb_.Run(reference_id, MediaKeys::kUnknownError, 0); 20758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return; 20858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 209f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) if (!AddDecryptionKey(it->first, it->second)) { 210f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) key_error_cb_.Run(reference_id, MediaKeys::kUnknownError, 0); 21158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return; 21258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 21358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 2145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2152a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (!new_audio_key_cb_.is_null()) 2162a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) new_audio_key_cb_.Run(); 2175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2182a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (!new_video_key_cb_.is_null()) 2192a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) new_video_key_cb_.Run(); 2205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 221f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles) key_added_cb_.Run(reference_id); 2225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 224f2477e01787aa58f445919b809d89e252beef54fTorne (Richard Coles)void AesDecryptor::CancelKeyRequest(uint32 reference_id) { 2255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 227eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen MurdochDecryptor* AesDecryptor::GetDecryptor() { 228868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) return this; 229868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)} 230868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) 2312a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void AesDecryptor::RegisterNewKeyCB(StreamType stream_type, 2322a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const NewKeyCB& new_key_cb) { 2335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) switch (stream_type) { 2345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) case kAudio: 2352a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) new_audio_key_cb_ = new_key_cb; 2365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 2375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) case kVideo: 2382a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) new_video_key_cb_ = new_key_cb; 2395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 2405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) default: 2415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED(); 2425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::Decrypt(StreamType stream_type, 2465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const scoped_refptr<DecoderBuffer>& encrypted, 2475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const DecryptCB& decrypt_cb) { 248ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch CHECK(encrypted->decrypt_config()); 2495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) scoped_refptr<DecoderBuffer> decrypted; 2515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // An empty iv string signals that the frame is unencrypted. 252ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch if (encrypted->decrypt_config()->iv().empty()) { 253ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch int data_offset = encrypted->decrypt_config()->data_offset(); 254ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch decrypted = DecoderBuffer::CopyFrom(encrypted->data() + data_offset, 255ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch encrypted->data_size() - data_offset); 2565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 257ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch const std::string& key_id = encrypted->decrypt_config()->key_id(); 2582a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) DecryptionKey* key = GetKey(key_id); 2592a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (!key) { 2602a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) DVLOG(1) << "Could not find a matching key for the given key ID."; 2612a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) decrypt_cb.Run(kNoKey, NULL); 2622a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return; 2632a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 2642a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 2655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) crypto::SymmetricKey* decryption_key = key->decryption_key(); 266868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) decrypted = DecryptData(*encrypted.get(), decryption_key); 267868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) if (!decrypted.get()) { 2685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Decryption failed."; 2695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) decrypt_cb.Run(kError, NULL); 2705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 2715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 274ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch decrypted->set_timestamp(encrypted->timestamp()); 275ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch decrypted->set_duration(encrypted->duration()); 2765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) decrypt_cb.Run(kSuccess, decrypted); 2775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::CancelDecrypt(StreamType stream_type) { 2805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Decrypt() calls the DecryptCB synchronously so there's nothing to cancel. 2815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2832a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void AesDecryptor::InitializeAudioDecoder(const AudioDecoderConfig& config, 2845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const DecoderInitCB& init_cb) { 2855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // AesDecryptor does not support audio decoding. 2865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) init_cb.Run(false); 2875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2892a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void AesDecryptor::InitializeVideoDecoder(const VideoDecoderConfig& config, 2905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const DecoderInitCB& init_cb) { 2915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // AesDecryptor does not support video decoding. 2925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) init_cb.Run(false); 2935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::DecryptAndDecodeAudio( 2965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const scoped_refptr<DecoderBuffer>& encrypted, 2975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const AudioDecodeCB& audio_decode_cb) { 2985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << "AesDecryptor does not support audio decoding"; 2995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::DecryptAndDecodeVideo( 3025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const scoped_refptr<DecoderBuffer>& encrypted, 3035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const VideoDecodeCB& video_decode_cb) { 3045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << "AesDecryptor does not support video decoding"; 3055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::ResetDecoder(StreamType stream_type) { 3085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << "AesDecryptor does not support audio/video decoding"; 3095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::DeinitializeDecoder(StreamType stream_type) { 3125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << "AesDecryptor does not support audio/video decoding"; 3135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 31558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)bool AesDecryptor::AddDecryptionKey(const std::string& key_id, 31658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) const std::string& key_string) { 31758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) scoped_ptr<DecryptionKey> decryption_key(new DecryptionKey(key_string)); 31858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!decryption_key) { 31958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DVLOG(1) << "Could not create key."; 32058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return false; 32158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 32258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 32358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!decryption_key->Init()) { 32458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DVLOG(1) << "Could not initialize decryption key."; 32558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return false; 32658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 32758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 3285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::AutoLock auto_lock(key_map_lock_); 3295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) KeyMap::iterator found = key_map_.find(key_id); 3305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (found != key_map_.end()) { 3315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) delete found->second; 3325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) key_map_.erase(found); 3335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) key_map_[key_id] = decryption_key.release(); 33558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return true; 3365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AesDecryptor::DecryptionKey* AesDecryptor::GetKey( 3395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const std::string& key_id) const { 3405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::AutoLock auto_lock(key_map_lock_); 3415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) KeyMap::const_iterator found = key_map_.find(key_id); 3425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (found == key_map_.end()) 3435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 3445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return found->second; 3465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AesDecryptor::DecryptionKey::DecryptionKey(const std::string& secret) 3495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : secret_(secret) { 3505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AesDecryptor::DecryptionKey::~DecryptionKey() {} 3535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool AesDecryptor::DecryptionKey::Init() { 3555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CHECK(!secret_.empty()); 3565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) decryption_key_.reset(crypto::SymmetricKey::Import( 3575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) crypto::SymmetricKey::AES, secret_)); 358c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (!decryption_key_) 3595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 3605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 3615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace media 364