aes_decryptor.cc revision 58537e28ecd584eab876aee8be7156509866d23a
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) 958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)#include "base/base64.h" 1058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)#include "base/json/json_reader.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/stl_util.h" 13868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)#include "base/strings/string_number_conversions.h" 1458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)#include "base/strings/string_util.h" 1558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)#include "base/values.h" 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "crypto/encryptor.h" 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "crypto/symmetric_key.h" 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/audio_decoder_config.h" 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/decoder_buffer.h" 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/decrypt_config.h" 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/video_decoder_config.h" 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "media/base/video_frame.h" 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace media { 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)uint32 AesDecryptor::next_session_id_ = 1; 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)enum ClearBytesBufferSel { 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) kSrcContainsClearBytes, 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) kDstContainsClearBytes 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)typedef std::vector<std::pair<std::string, std::string> > JWKKeys; 3458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static void CopySubsamples(const std::vector<SubsampleEntry>& subsamples, 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const ClearBytesBufferSel sel, 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8* src, 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8* dst) { 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < subsamples.size(); i++) { 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const SubsampleEntry& subsample = subsamples[i]; 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (sel == kSrcContainsClearBytes) { 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) src += subsample.clear_bytes; 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) dst += subsample.clear_bytes; 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memcpy(dst, src, subsample.cypher_bytes); 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) src += subsample.cypher_bytes; 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) dst += subsample.cypher_bytes; 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 5258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)// Processes a JSON Web Key to extract the key id and key value. Adds the 5358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)// id/value pair to |jwk_keys| and returns true on success. 5458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)static bool ProcessSymmetricKeyJWK(const DictionaryValue& jwk, 5558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) JWKKeys* jwk_keys) { 5658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // A symmetric keys JWK looks like the following in JSON: 5758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // { "kty":"oct", 5858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // "kid":"AAECAwQFBgcICQoLDA0ODxAREhM=", 5958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // "k":"FBUWFxgZGhscHR4fICEiIw==" } 6058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // There may be other properties specified, but they are ignored. 6158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // Ref: http://tools.ietf.org/html/draft-ietf-jose-json-web-key-14 6258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // and: 6358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // http://tools.ietf.org/html/draft-jones-jose-json-private-and-symmetric-key-00 6458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 6558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // Have found a JWK, start by checking that it is a symmetric key. 6658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) std::string type; 6758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!jwk.GetString("kty", &type) || type != "oct") { 6858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DVLOG(1) << "JWK is not a symmetric key"; 6958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return false; 7058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 7158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 7258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // Get the key id and actual key parameters. 7358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) std::string encoded_key_id; 7458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) std::string encoded_key; 7558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!jwk.GetString("kid", &encoded_key_id)) { 7658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DVLOG(1) << "Missing 'kid' parameter"; 7758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return false; 7858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 7958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!jwk.GetString("k", &encoded_key)) { 8058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DVLOG(1) << "Missing 'k' parameter"; 8158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return false; 8258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 8358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 8458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // Key ID and key are base64-encoded strings, so decode them. 8558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // TODO(jrummell): The JWK spec and the EME spec don't say that 'kid' must be 8658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // base64-encoded (they don't say anything at all). Verify with the EME spec. 8758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) std::string decoded_key_id; 8858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) std::string decoded_key; 8958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!base::Base64Decode(encoded_key_id, &decoded_key_id) || 9058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) decoded_key_id.empty()) { 9158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DVLOG(1) << "Invalid 'kid' value"; 9258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return false; 9358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 9458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!base::Base64Decode(encoded_key, &decoded_key) || 9558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) decoded_key.length() != 9658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) static_cast<size_t>(DecryptConfig::kDecryptionKeySize)) { 9758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DVLOG(1) << "Invalid length of 'k' " << decoded_key.length(); 9858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return false; 9958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 10058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 10158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // Add the decoded key ID and the decoded key to the list. 10258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) jwk_keys->push_back(std::make_pair(decoded_key_id, decoded_key)); 10358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return true; 10458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} 10558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 10658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)// Extracts the JSON Web Keys from a JSON Web Key Set. If |input| looks like 10758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)// a valid JWK Set, then true is returned and |jwk_keys| is updated to contain 10858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)// the list of keys found. Otherwise return false. 10958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)static bool ExtractJWKKeys(const std::string& input, JWKKeys* jwk_keys) { 11058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // TODO(jrummell): The EME spec references a smaller set of allowed ASCII 11158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // values. Verify with spec that the smaller character set is needed. 11258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!IsStringASCII(input)) 11358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return false; 11458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 11558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) scoped_ptr<Value> root(base::JSONReader().ReadToValue(input)); 11658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!root.get() || root->GetType() != Value::TYPE_DICTIONARY) 11758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return false; 11858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 11958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // A JSON Web Key Set looks like the following in JSON: 12058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // { "keys": [ JWK1, JWK2, ... ] } 12158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // (See ProcessSymmetricKeyJWK() for description of JWK.) 12258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // There may be other properties specified, but they are ignored. 12358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // Locate the set from the dictionary. 12458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DictionaryValue* dictionary = static_cast<DictionaryValue*>(root.get()); 12558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) ListValue* list_val = NULL; 12658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!dictionary->GetList("keys", &list_val)) { 12758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DVLOG(1) << "Missing 'keys' parameter or not a list in JWK Set"; 12858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return false; 12958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 13058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 13158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // Create a local list of keys, so that |jwk_keys| only gets updated on 13258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // success. 13358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) JWKKeys local_keys; 13458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) for (size_t i = 0; i < list_val->GetSize(); ++i) { 13558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DictionaryValue* jwk = NULL; 13658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!list_val->GetDictionary(i, &jwk)) { 13758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DVLOG(1) << "Unable to access 'keys'[" << i << "] in JWK Set"; 13858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return false; 13958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 14058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!ProcessSymmetricKeyJWK(*jwk, &local_keys)) { 14158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DVLOG(1) << "Error from 'keys'[" << i << "]"; 14258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return false; 14358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 14458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 14558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 14658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // Successfully processed all JWKs in the set. 14758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) jwk_keys->swap(local_keys); 14858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return true; 14958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)} 15058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 1515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Decrypts |input| using |key|. Returns a DecoderBuffer with the decrypted 1525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// data if decryption succeeded or NULL if decryption failed. 1535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static scoped_refptr<DecoderBuffer> DecryptData(const DecoderBuffer& input, 1545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) crypto::SymmetricKey* key) { 155ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch CHECK(input.data_size()); 156ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch CHECK(input.decrypt_config()); 1575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CHECK(key); 1585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) crypto::Encryptor encryptor; 1605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!encryptor.Init(key, crypto::Encryptor::CTR, "")) { 1615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Could not initialize decryptor."; 1625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 1635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 165ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch DCHECK_EQ(input.decrypt_config()->iv().size(), 1665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) static_cast<size_t>(DecryptConfig::kDecryptionKeySize)); 167ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch if (!encryptor.SetCounter(input.decrypt_config()->iv())) { 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Could not set counter block."; 1695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 1705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 172ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch const int data_offset = input.decrypt_config()->data_offset(); 1735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const char* sample = 174ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch reinterpret_cast<const char*>(input.data() + data_offset); 175ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch int sample_size = input.data_size() - data_offset; 1765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 177a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) DCHECK_GT(sample_size, 0) << "No sample data to be decrypted."; 178a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) if (sample_size <= 0) 179a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) return NULL; 180a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) 181ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch if (input.decrypt_config()->subsamples().empty()) { 1825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::string decrypted_text; 1835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::StringPiece encrypted_text(sample, sample_size); 1845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!encryptor.Decrypt(encrypted_text, &decrypted_text)) { 1855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Could not decrypt data."; 1865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 1875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(xhwang): Find a way to avoid this data copy. 1905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return DecoderBuffer::CopyFrom( 1915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const uint8*>(decrypted_text.data()), 1925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) decrypted_text.size()); 1935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const std::vector<SubsampleEntry>& subsamples = 196ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch input.decrypt_config()->subsamples(); 1975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int total_clear_size = 0; 1995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int total_encrypted_size = 0; 2005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (size_t i = 0; i < subsamples.size(); i++) { 2015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) total_clear_size += subsamples[i].clear_bytes; 2025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) total_encrypted_size += subsamples[i].cypher_bytes; 2035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (total_clear_size + total_encrypted_size != sample_size) { 2055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Subsample sizes do not equal input size"; 2065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 2075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 209a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) // No need to decrypt if there is no encrypted data. 210a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) if (total_encrypted_size <= 0) { 211a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) return DecoderBuffer::CopyFrom(reinterpret_cast<const uint8*>(sample), 212a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) sample_size); 213a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) } 214a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) 2155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The encrypted portions of all subsamples must form a contiguous block, 2165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // such that an encrypted subsample that ends away from a block boundary is 2175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // immediately followed by the start of the next encrypted subsample. We 2185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // copy all encrypted subsamples to a contiguous buffer, decrypt them, then 2195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // copy the decrypted bytes over the encrypted bytes in the output. 2205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(strobe): attempt to reduce number of memory copies 221c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) scoped_ptr<uint8[]> encrypted_bytes(new uint8[total_encrypted_size]); 2225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CopySubsamples(subsamples, kSrcContainsClearBytes, 2235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const uint8*>(sample), encrypted_bytes.get()); 2245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::StringPiece encrypted_text( 2265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const char*>(encrypted_bytes.get()), 2275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) total_encrypted_size); 2285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::string decrypted_text; 2295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!encryptor.Decrypt(encrypted_text, &decrypted_text)) { 2305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Could not decrypt data."; 2315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 2325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 233a36e5920737c6adbddd3e43b760e5de8431db6e0Torne (Richard Coles) DCHECK_EQ(decrypted_text.size(), encrypted_text.size()); 2345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) scoped_refptr<DecoderBuffer> output = DecoderBuffer::CopyFrom( 2365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const uint8*>(sample), sample_size); 2375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CopySubsamples(subsamples, kDstContainsClearBytes, 2385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) reinterpret_cast<const uint8*>(decrypted_text.data()), 239ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch output->writable_data()); 2405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return output; 2415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2432a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)AesDecryptor::AesDecryptor(const KeyAddedCB& key_added_cb, 2442a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const KeyErrorCB& key_error_cb, 245eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch const KeyMessageCB& key_message_cb) 2462a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) : key_added_cb_(key_added_cb), 2472a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) key_error_cb_(key_error_cb), 248eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch key_message_cb_(key_message_cb) { 2495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AesDecryptor::~AesDecryptor() { 2525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) STLDeleteValues(&key_map_); 2535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2557d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)bool AesDecryptor::GenerateKeyRequest(const std::string& type, 2565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8* init_data, 2575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int init_data_length) { 2585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) std::string session_id_string(base::UintToString(next_session_id_++)); 2595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2607d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) // For now, the AesDecryptor does not care about |type|; 2615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // just fire the event with the |init_data| as the request. 262eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch std::vector<uint8> message; 263eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch if (init_data && init_data_length) 264eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch message.assign(init_data, init_data + init_data_length); 2655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2667d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) key_message_cb_.Run(session_id_string, message, std::string()); 2675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 2685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2707d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)void AesDecryptor::AddKey(const uint8* key, 2715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int key_length, 2725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint8* init_data, 2735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int init_data_length, 2745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const std::string& session_id) { 2755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CHECK(key); 2765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CHECK_GT(key_length, 0); 2775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 27858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // AddKey() is called from update(), where the key(s) are passed as a JSON 27958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // Web Key (JWK) set. Each JWK needs to be a symmetric key ('kty' = "oct"), 28058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // with 'kid' being the base64-encoded key id, and 'k' being the 28158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // base64-encoded key. 28258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // 28358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // For backwards compatibility with v0.1b of the spec (where |key| is the raw 28458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // key and |init_data| is the key id), if |key| is not valid JSON, then 28558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // attempt to process it as a raw key. 28658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 2875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // TODO(xhwang): Add |session_id| check after we figure out how: 2885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // https://www.w3.org/Bugs/Public/show_bug.cgi?id=16550 2895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 29058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) std::string key_string(reinterpret_cast<const char*>(key), key_length); 29158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) JWKKeys jwk_keys; 29258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (ExtractJWKKeys(key_string, &jwk_keys)) { 29358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // Since |key| represents valid JSON, init_data must be empty. 29458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DCHECK(!init_data); 29558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DCHECK_EQ(init_data_length, 0); 2965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 29758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // Make sure that at least one key was extracted. 29858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (jwk_keys.empty()) { 29958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) key_error_cb_.Run(session_id, MediaKeys::kUnknownError, 0); 30058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return; 30158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 30258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) for (JWKKeys::iterator it = jwk_keys.begin() ; it != jwk_keys.end(); ++it) { 30358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!AddDecryptionKey(it->first, it->second)) { 30458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) key_error_cb_.Run(session_id, MediaKeys::kUnknownError, 0); 30558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return; 30658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 30758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 30858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } else { 30958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // v0.1b backwards compatibility support. 31058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // TODO(jrummell): Remove this code once v0.1b no longer supported. 3115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 31258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (key_string.length() != 31358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) static_cast<size_t>(DecryptConfig::kDecryptionKeySize)) { 31458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DVLOG(1) << "Invalid key length: " << key_string.length(); 31558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) key_error_cb_.Run(session_id, MediaKeys::kUnknownError, 0); 31658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return; 31758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 31858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 31958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // TODO(xhwang): Fix the decryptor to accept no |init_data|. See 32058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // http://crbug.com/123265. Until then, ensure a non-empty value is passed. 32158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) static const uint8 kDummyInitData[1] = {0}; 32258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!init_data) { 32358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) init_data = kDummyInitData; 32458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) init_data_length = arraysize(kDummyInitData); 32558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 3265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 32758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // TODO(xhwang): For now, use |init_data| for key ID. Make this more spec 32858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // compliant later (http://crbug.com/123262, http://crbug.com/123265). 32958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) std::string key_id_string(reinterpret_cast<const char*>(init_data), 33058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) init_data_length); 33158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!AddDecryptionKey(key_id_string, key_string)) { 33258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // Error logged in AddDecryptionKey() 33358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) key_error_cb_.Run(session_id, MediaKeys::kUnknownError, 0); 33458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return; 33558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 33658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 3375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3382a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (!new_audio_key_cb_.is_null()) 3392a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) new_audio_key_cb_.Run(); 3405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3412a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (!new_video_key_cb_.is_null()) 3422a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) new_video_key_cb_.Run(); 3435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3447d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles) key_added_cb_.Run(session_id); 3455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3477d4cd473f85ac64c3747c96c277f9e506a0d2246Torne (Richard Coles)void AesDecryptor::CancelKeyRequest(const std::string& session_id) { 3485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 350eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen MurdochDecryptor* AesDecryptor::GetDecryptor() { 351868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) return this; 352868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles)} 353868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) 3542a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void AesDecryptor::RegisterNewKeyCB(StreamType stream_type, 3552a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const NewKeyCB& new_key_cb) { 3565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) switch (stream_type) { 3575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) case kAudio: 3582a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) new_audio_key_cb_ = new_key_cb; 3595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 3605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) case kVideo: 3612a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) new_video_key_cb_ = new_key_cb; 3625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) break; 3635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) default: 3645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED(); 3655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 3675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::Decrypt(StreamType stream_type, 3695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const scoped_refptr<DecoderBuffer>& encrypted, 3705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const DecryptCB& decrypt_cb) { 371ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch CHECK(encrypted->decrypt_config()); 3725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) scoped_refptr<DecoderBuffer> decrypted; 3745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // An empty iv string signals that the frame is unencrypted. 375ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch if (encrypted->decrypt_config()->iv().empty()) { 376ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch int data_offset = encrypted->decrypt_config()->data_offset(); 377ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch decrypted = DecoderBuffer::CopyFrom(encrypted->data() + data_offset, 378ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch encrypted->data_size() - data_offset); 3795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { 380ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch const std::string& key_id = encrypted->decrypt_config()->key_id(); 3812a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) DecryptionKey* key = GetKey(key_id); 3822a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) if (!key) { 3832a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) DVLOG(1) << "Could not find a matching key for the given key ID."; 3842a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) decrypt_cb.Run(kNoKey, NULL); 3852a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) return; 3862a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) } 3872a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 3885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) crypto::SymmetricKey* decryption_key = key->decryption_key(); 389868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) decrypted = DecryptData(*encrypted.get(), decryption_key); 390868fa2fe829687343ffae624259930155e16dbd8Torne (Richard Coles) if (!decrypted.get()) { 3915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DVLOG(1) << "Decryption failed."; 3925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) decrypt_cb.Run(kError, NULL); 3935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return; 3945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 3965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 397ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch decrypted->set_timestamp(encrypted->timestamp()); 398ca12bfac764ba476d6cd062bf1dde12cc64c3f40Ben Murdoch decrypted->set_duration(encrypted->duration()); 3995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) decrypt_cb.Run(kSuccess, decrypted); 4005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::CancelDecrypt(StreamType stream_type) { 4035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Decrypt() calls the DecryptCB synchronously so there's nothing to cancel. 4045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4062a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void AesDecryptor::InitializeAudioDecoder(const AudioDecoderConfig& config, 4075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const DecoderInitCB& init_cb) { 4085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // AesDecryptor does not support audio decoding. 4095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) init_cb.Run(false); 4105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4122a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)void AesDecryptor::InitializeVideoDecoder(const VideoDecoderConfig& config, 4135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const DecoderInitCB& init_cb) { 4145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // AesDecryptor does not support video decoding. 4155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) init_cb.Run(false); 4165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::DecryptAndDecodeAudio( 4195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const scoped_refptr<DecoderBuffer>& encrypted, 4205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const AudioDecodeCB& audio_decode_cb) { 4215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << "AesDecryptor does not support audio decoding"; 4225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::DecryptAndDecodeVideo( 4255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const scoped_refptr<DecoderBuffer>& encrypted, 4265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const VideoDecodeCB& video_decode_cb) { 4275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << "AesDecryptor does not support video decoding"; 4285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::ResetDecoder(StreamType stream_type) { 4315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << "AesDecryptor does not support audio/video decoding"; 4325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void AesDecryptor::DeinitializeDecoder(StreamType stream_type) { 4355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NOTREACHED() << "AesDecryptor does not support audio/video decoding"; 4365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 43858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles)bool AesDecryptor::AddDecryptionKey(const std::string& key_id, 43958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) const std::string& key_string) { 44058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) scoped_ptr<DecryptionKey> decryption_key(new DecryptionKey(key_string)); 44158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!decryption_key) { 44258537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DVLOG(1) << "Could not create key."; 44358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return false; 44458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 44558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 44658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) if (!decryption_key->Init()) { 44758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) DVLOG(1) << "Could not initialize decryption key."; 44858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return false; 44958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) } 45058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 4515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::AutoLock auto_lock(key_map_lock_); 4525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) KeyMap::iterator found = key_map_.find(key_id); 4535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (found != key_map_.end()) { 4545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) delete found->second; 4555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) key_map_.erase(found); 4565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 4575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) key_map_[key_id] = decryption_key.release(); 45858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) return true; 4595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AesDecryptor::DecryptionKey* AesDecryptor::GetKey( 4625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const std::string& key_id) const { 4635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::AutoLock auto_lock(key_map_lock_); 4645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) KeyMap::const_iterator found = key_map_.find(key_id); 4655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (found == key_map_.end()) 4665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return NULL; 4675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return found->second; 4695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AesDecryptor::DecryptionKey::DecryptionKey(const std::string& secret) 4725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : secret_(secret) { 4735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)AesDecryptor::DecryptionKey::~DecryptionKey() {} 4765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)bool AesDecryptor::DecryptionKey::Init() { 4785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) CHECK(!secret_.empty()); 4795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) decryption_key_.reset(crypto::SymmetricKey::Import( 4805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) crypto::SymmetricKey::AES, secret_)); 481c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles) if (!decryption_key_) 4825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return false; 4835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return true; 4845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 4855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace media 487